In the research, trees along 42 roads in Chongqing were explored and es- timated in terms of aesthetics, and aesthetic tendency and major influential factors of aesthetic value of street greenbelts in Chongqing arteri...In the research, trees along 42 roads in Chongqing were explored and es- timated in terms of aesthetics, and aesthetic tendency and major influential factors of aesthetic value of street greenbelts in Chongqing arterial roads were estimated with phychophysical method to establish SBE model of arterial road greenbelts land- scape.展开更多
Chongqing is the largest municipality under the Chinese Central Government (MCG) in terms of administrative area and population and is now the most important economic and cultural center of the upper Yangtze River and...Chongqing is the largest municipality under the Chinese Central Government (MCG) in terms of administrative area and population and is now the most important economic and cultural center of the upper Yangtze River and Three Gorges area. The Three Gorges Dam project, one of the largest world infrastructure projects, causes a great deal of immigration to Chongqing and results in the rapid urbanization of the city, and it has brought in a great deal of environmental impact, which is a global concerned issue. This paper introduces the city profile of Chongqing municipality and its urbanization impact on energy and environment. The demand and the trend of energy consumption in built environment (building and transport) have been analysed. The living environment of Chongqing residents and the local energy efficient policy have been introduced. Finally the authors discuss the key issues of the sustainable urban development of Chongqing.展开更多
Rapid urbanization results in the conversion of natural soil to urban soil,and consequently,the storage and density of the soil carbon pools change.Taking Chongqing Municipality of China as a study case,this investiga...Rapid urbanization results in the conversion of natural soil to urban soil,and consequently,the storage and density of the soil carbon pools change.Taking Chongqing Municipality of China as a study case,this investigation attempts to better understand soil carbon pools in hilly cities.First,the vegetated areas in the study area were derived from QuickBird images.Then,topsoil data from 220 soil samples(0-20 cm) in the vegetated areas were collected and their soil organic carbon(SOC) densities were analyzed.Using the Kriging interpolation method,the spatial pattern of SOC was estimated.The results show that the SOC density exhibited high spatial variability in the urban topsoil of Chongqing.First,the SOC density in topsoil decreased according to slope in the order 2°-6° < 25°-90° < 0°-2° < 6°-15° < 15°-25°.Second,the newly developed areas during 2001-2010 had a lower SOC density than the areas built before 1988.Third,urban parks and gardens had a higher SOC density in topsoil,residential green land followed,and scattered street green land ranked last.For hilly cities,the variability of terrain affects the distribution of SOC.The Kriging results indicate that Kriging method combining slope with SOC density produced a high level of accuracy.The Kriging results show that the SOC density to the north of the Jialing River was higher than the south.The vegetated areas were estimated to amount to 73.5 km2 across the study area with an SOC storage of 0.192 Tg and an average density of 2.61 kg/m2.展开更多
To develop characteristic and profitable agriculture was proposed in the 4th congress of party representatives in Chongqing, based on Chongqing practical development in major cities, rural regions, mountain regions, a...To develop characteristic and profitable agriculture was proposed in the 4th congress of party representatives in Chongqing, based on Chongqing practical development in major cities, rural regions, mountain regions, and poverty-stricken areas. It would be effective for sustainable development and farmers’ income improvement. However, some existing problems should be well considered, including special geographical locations, unsatisfied application of science and technology in agriculture, loss of young labors and aging issues. In the research, the existing problems in developing characteristic and profitable agriculture were analyzed and the corresponding strategies were proposed as well.展开更多
Objective: Male breast cancer is a rare disease with an incidence of about 1% of breast cancers in USA, but relatively lack of the information of male breast cancer in China, especially in Southwest of China, led us t...Objective: Male breast cancer is a rare disease with an incidence of about 1% of breast cancers in USA, but relatively lack of the information of male breast cancer in China, especially in Southwest of China, led us to study its incidence trends. Methods: Chongqing is one of the biggest and the most important areas that is located in Southwest of China. There are around 31.4 million people who live in approximate 82 402.95 km2area of Chongqing. Data about breast cancer patients registered in the Center for Disease Prevention and Control of Chongqing(China) were statistically collected from 187 hospitals, about 58 hospitals in city and 129 hospitals in country, and over 6.2 million people were studied every year. It was tried to represent all the people in villages and cities in Chongqing, China. Results: The incidence of male breast cancer in Southwest of China ranged from 0.34/100 000 to 1.45/100 000 between 2007 and 2011, while the incidence of female breast cancer ranged from 15.40/100000 to 21.66/100000 at the same time. The rate of male breast cancer to female breast cancer ranged from 0.02:1 to 0.07:1, male breast cancer accounted for 1.96% to 6.5%(with the mean value of 2.9%) of breast cancers in Southwest of China from 2007 to 2010. Conclusion: In Southwest of China male breast cancer accounts for about 2.9% of breast cancers which is higher than that in United States. It is important for policy makers and health manager to seriously consider breast cancer in future plan in Southwest of China.展开更多
An effective approach for describing complicated water quality processes is very important for river water quality management. We built two artificial neural network(ANN) models,a feed-forward back-propagation(BP) mod...An effective approach for describing complicated water quality processes is very important for river water quality management. We built two artificial neural network(ANN) models,a feed-forward back-propagation(BP) model and a radial basis function(RBF) model,to simulate the water quality of the Yangtze and Jialing Rivers in reaches crossing the city of Chongqing,P. R. China. Our models used the historical monitoring data of biological oxygen demand,dissolved oxygen,ammonia,oil and volatile phenolic compounds. Comparison with the one-dimensional traditional water quality model suggest that both BP and RBF models are superior; their higher accuracy and better goodness-of-fit indicate that the ANN calculation of water quality agrees better with measurement. It is demonstrated that ANN modeling can be a tool for estimating the water quality of the Yangtze River. Of the two ANN models,the RBF model calculates with a smaller mean error,but a larger root mean square error. More effort to identify out the causes of these differences would help optimize the structures of neural network water-quality models.展开更多
Urban Agglomeration is an inevitable outcome of urbanization and industrialization, and a main form of urban development. Based on the analysis of urbanization and urban system situation, this paper will discuss the i...Urban Agglomeration is an inevitable outcome of urbanization and industrialization, and a main form of urban development. Based on the analysis of urbanization and urban system situation, this paper will discuss the integration of urban agglomeration development, using the urban area of Cheng (Chengdu)-Yu (Chongqing) Urban agglomeration (CYUA) as a case study. By means of industries, population and spatial integrations, the function, strength and competition of CYUA will be improved and this urban agglomeration will transit from a budding state to a growing and mature one in future. The sustainable development of CYUA will depend on countermeasures, such as accelerating industrialization and urbanization, building a traffic network and express roads, strengthening the ability of self-sufficiency, enlarging the ecological construction and environmental protection, and establishing the synergetic institution of cross districts.展开更多
Accompanying the development of social economy,the land use model of mountainous area,typically eco-weak area,is changing gradually. Here the establishment of eco-friendly land use model in mountainous area,will pione...Accompanying the development of social economy,the land use model of mountainous area,typically eco-weak area,is changing gradually. Here the establishment of eco-friendly land use model in mountainous area,will pioneer the model of sustainable development in that area. Concerning Qianjiang District of Chongqing Municipality,huge change of land use model,mainly embodied in the unceasing increase of construction land and gradual decrease of agricultural use land,has taken place in recent years. To explore the eco-friendly land use model in mountainous area,Qianjiang District was chosen as the study object in the present study. Via analyzing the changes in land use model,we found that related eco-environment restrictive factors mainly regional climatic change,soil texture,hydrological environment as well as soil erosion and land degradation,etc. And based on these results,we further analyzed the effect of land use change on eco-environment and the factors restricting the maintenance of eco-environment and regional development,finally put forward the counter measures for balancing land use and co-environment in mountainous area. The results will be important for the development of social economy and eco-system construction in Qianjiang District.展开更多
Based on the remote sensing images of urban land use of Chongqing City Proper in the last 30years(from 1978 to 2011),The paper focuses on the impact of urban spatial expansion on urban ecosystem service.The charactere...Based on the remote sensing images of urban land use of Chongqing City Proper in the last 30years(from 1978 to 2011),The paper focuses on the impact of urban spatial expansion on urban ecosystem service.The charactereristics of urban spatial expansion pattern are expressed by Landscape Expansion Index and Index of Fractal Dimension.Taking advantage of calculation of these two indices,changes of the ecological service values in the main urban area of Chongqing caused by the variation of urban expansion patterns are evaluated and the interrelationship is analyzed.The main conclusions and results are as follows;in Chongqing City Proper,the ecological service value decreased rapidly from 1978 to 2011,especially in the period of 2002-2011.Urban spatial expansion pattern has exerted significant impact on urban ecosystem service value.Edge-expansion pattern broke into a great deal of urban enclaves and caused the disadvantage effect of the function of urban ecological system.At the same time,negative correlation existed between the indices of fractal dimension and the ecosystem service value.展开更多
What rural households think and what kind of strategies they take, the basic driving force in land use activities, contribute greatly to the increase of their own revenues, the development of agricultural yields, and ...What rural households think and what kind of strategies they take, the basic driving force in land use activities, contribute greatly to the increase of their own revenues, the development of agricultural yields, and even the prosperity of rural areas. Differentiation in rural household behaviors and their consciousness in land use activities is widespread in rural China nowadays. It is important to understand the changing characteristics and laws of land use behaviors of rural households driven by their consciousness, so as to regulate their land use activities. In most empirical studies of land use change at rural household level, the land use consciousness, which acts directly on land use behaviors, is often neglected. In our research, the changes of land use behaviors of rural households are analyzed, through identifying how the land use consciousness affect the land use objectives, land management scales and land inputs of all the rural households in Bailin Village of Chongqing Municipality in the western mountainous China. Also, how the land use consciousness of different rural households comes into being under external stimuli is examined and the self-adjustment process of their consciousness according to their own conditions is also discussed. Finally, broad policy instruments are suggested to promote the rationalization of rural households′ land use consciousness and the standardization of their land use behaviors.展开更多
Black shale is widely distributed in southern and western China.The swelling and breakdown characteristics of black shale are important physicomechanical properties in engineering activities.Aqueous solutions with dif...Black shale is widely distributed in southern and western China.The swelling and breakdown characteristics of black shale are important physicomechanical properties in engineering activities.Aqueous solutions with different compositions exert various influences on the swelling characteristic of black shale because of the complexity of its composition.Soils derived from black shale are most commonly developed on black shales with bedded horizons that generally have cutting and weathering profiles.This paper reports an axial free swelling study for soils derived from black shales and developed in the Lower Cambrian black shales in Chengkou County,Chongqing Municipality,Southwest China.To discuss the swelling characteristics of black shale under the influence of cations,an axial free swelling test was conducted on black shale samples while considering the initial water content,weathering stage of black shale,and different cationic solutions with various concentrations.Results showed that the swelling deformation curve of black shale could be divided into three phases:acceleration,deceleration,and stability.The axial swelling ratio eventually decreased with increasing water content,and the axial free swelling rate changed with the free expansion model of the exponential relationship.Under a constant initial water content,the axial swelling rate increased with the intensity of black shale weathering in the same immersion solution.When different types of immersion solutions were used,the cationic price was high and the axial swelling rate increased with rising cation valence.The changes in the swelling ratio were significant at a valence of one or two.The results of this study provide further understanding of the engineering geological characteristics of black shale and the geological hazards caused by the swelling characteristics of black shale.展开更多
This paper presents the research on the atmospheric corrosion rates of carbon steel, zinc and copper in Chongqing, which was a corrosion subprogram of an international project, Regional Air Pollution in Developing Cou...This paper presents the research on the atmospheric corrosion rates of carbon steel, zinc and copper in Chongqing, which was a corrosion subprogram of an international project, Regional Air Pollution in Developing Countries. We performed field exposure tests of carbon steel, zinc and copper at an urban site Guanyinqiao and a rural site Tieshanping inChongqing, then used grey relational analysis, based on the database of the whole corrosion project, to determine the order of the effect of environmental factors on corrosion rates of tested metals, and established dose-response functions for these three metals. The results showed that the two crucial agents of acidic environment, SO2 and H+, were common factors that contributed most to the corrosion of the tested metals. The established dose-response functions for outdoor carbon steel and zinc are proved applicable to use in Chongqing, but the function for copper needs further modifying. We employed these dose- response functions and general environmental data to elaborate the maps of corrosion rate respectively of carbon steel and zinc by geological information system (GIS) technique which help to identify areas of high corrosion damage risk. An acceptable annual average SO2 level of 21 μg/m3 for carbon steel and that of 61 μg/m3 for zinc are also put forward to control the air pollution impact on atmospheric corrosion in Chongqing urban areas.展开更多
In 2015, the area of first and second class land in Tongnan Distdct of Chongqing was 221.646 km2, accounting for 30% of the total cultivated area, and the area of the third, fourth and fifth class land was 517.861 km2...In 2015, the area of first and second class land in Tongnan Distdct of Chongqing was 221.646 km2, accounting for 30% of the total cultivated area, and the area of the third, fourth and fifth class land was 517.861 km2, accounting for 70% of the total cultivated area. The quality of cultivated land was at a low level. Comparison with the Second Soil Census in 2015 showed that the soil pH value has been improved; the organic matter content in the tillage layer showed a slight upward trend; the contents of available nitrogen, available phosphorus and available potassium in the topsoil increased. Countermeasures were proposed as follows: vig- orously promote the construction of high-standard farmland; adjust the industrial structure of agriculture and implement farming reform; combine organic and inorgan- ic fertilization to reduce the amount of fertilizers; popularize soil testing and formu- lated fertilization to change farmers' traditional fertilization habits; improve pollution control to ensure the sustainable productivity of farmland; strictly promote the quality management of cultivated land and strengthen the construction of quality monitoring system; increase investment and improve the monitoring mechanism; vigorously publicize and enhance the awareness of all citizens in protecting cultivated land; im- prove the law of cultivated land protection and enhance the seriousness of the law on the protection of cultivated land.展开更多
To fully analyze emission characteristics of VOCs (Volatile Organic Compounds) from automobile coating industry in Chongqing city, related enterprises in the city were investigated in detail. The results show that t...To fully analyze emission characteristics of VOCs (Volatile Organic Compounds) from automobile coating industry in Chongqing city, related enterprises in the city were investigated in detail. The results show that the emission of VOCs from the automobile industry in Chongqing city was approximately 20,000 t in 2012, and the contribution rate of automobile coating was 83%. Most VOCs discharged from automobile coating industry were mainly from the use of coatings, diluents, curing agents and other materials containing VOCs. During the process of automobile coating, VOCs were mainly produced during the processes of spraying and drying. Besides, VOCs are partly produced during the processes of mixing paint, gluing, waxing and repairing. The major ingredients of VOCs discharged during the process of automobile coating were methylbenzene, dimethylbenzene, trimethylbenzene, cumene, ethyl acetate, butyl alcohol, n-butyl alcohol, isobutyl alcohol, formaldehyde, butanone, acetone, cyclohexanone and methyl ethyl ketone. Besides, the ingredients of naphtha and aromatic hydrocarbon in VOCs need to be determined. The maximum OFP (Ozone Formation Potential) of the above pollutants by the typical enterprises was 900-1,300 mg/m^3. The production of SOA (Secondary Organic Aerosol) was 3,636-11,073 t/a, which didn’t include the contribution of aldehydes, ketones, ethers and esters to SOA. This research could provide scientific reference for the establishment of emission standard, control technology and management methods of VOCs from automobile coating industry that accord with economic and social development in Chongqing city.展开更多
Daqing is a mining city that was set up on wetland by exploiting and processing petroleum.This paper points out that net-group urban system is the optimization mode for Daqin g urban spatial structure through an alyzi...Daqing is a mining city that was set up on wetland by exploiting and processing petroleum.This paper points out that net-group urban system is the optimization mode for Daqin g urban spatial structure through an alyzing and appraising the present situation,c haracteristics,advantages and dis advantages of Daqing spatial structure.And the best way of optimizing Daqing urban spatial structure is to adopt sustainable development strategy,establish th e coordinated grade structure of urban system,con struct developed towns net system,p refect the function structure of the towns at all levels,make full use of resources an d strengthen environmental protection.Spatial structure of Daqing must be according-ly adjusted in order to adapt to the tr ansformation of future economy types and functions.Based on the foundation of keep-ing net group,the development shoul d be from disperse to moderate centra lization in order to give prominence to the multi-function of the central city.Constr ucting ruralizing city should be the future goal of Daqing City.展开更多
The private hospital has increased the capacity of health service delivery in number and is going to become an important supplement for medical resources. The thesis is combined with the actual situation of Chongqing ...The private hospital has increased the capacity of health service delivery in number and is going to become an important supplement for medical resources. The thesis is combined with the actual situation of Chongqing Tongkang Orthopedic Hospital after its opening within half a year, so as to discuss the enlightenment from the position of medical institution, the performance management, the hospital culture and competitive environment at the beginning of the private hospital's foundation.展开更多
According to the essential features of urban economic strips, this paper is intended to point out that Chengdu-Chongqing strip has so far been an urban area in geographic or spatial sense, but not an urban economic st...According to the essential features of urban economic strips, this paper is intended to point out that Chengdu-Chongqing strip has so far been an urban area in geographic or spatial sense, but not an urban economic strip in economic sense.On further basis of analyzing several problems existing inthe development of Chengdu-Chongqing economic strip,some countermeasures are correspondingly put forward hereafter.展开更多
On June 15th 2005, Russian crude oil unloading reconstruction project of Nansan oil store, which has drawn much attention of the state, China National Petroleum Corporation (CNPC) and Daqing Oilfield, was successful...On June 15th 2005, Russian crude oil unloading reconstruction project of Nansan oil store, which has drawn much attention of the state, China National Petroleum Corporation (CNPC) and Daqing Oilfield, was successfully accomplished and put into operation, marking the start of large scale import of Russian crude and opening up a new era for Daqing Oilfield to involve in foreing crude trade.展开更多
文摘In the research, trees along 42 roads in Chongqing were explored and es- timated in terms of aesthetics, and aesthetic tendency and major influential factors of aesthetic value of street greenbelts in Chongqing arterial roads were estimated with phychophysical method to establish SBE model of arterial road greenbelts land- scape.
基金UK FCO GOF(PGI GCC 000012) and Chongqing Small town Programme (CSTC-2004AA7008)
文摘Chongqing is the largest municipality under the Chinese Central Government (MCG) in terms of administrative area and population and is now the most important economic and cultural center of the upper Yangtze River and Three Gorges area. The Three Gorges Dam project, one of the largest world infrastructure projects, causes a great deal of immigration to Chongqing and results in the rapid urbanization of the city, and it has brought in a great deal of environmental impact, which is a global concerned issue. This paper introduces the city profile of Chongqing municipality and its urbanization impact on energy and environment. The demand and the trend of energy consumption in built environment (building and transport) have been analysed. The living environment of Chongqing residents and the local energy efficient policy have been introduced. Finally the authors discuss the key issues of the sustainable urban development of Chongqing.
基金Under the auspices of the Specialized Research Fund for the Doctoral Program of Higher Education (No. 20090182120024)National Natural Science Foundation of China (No. 41101568)+1 种基金Natural Science Foundation Project of Chongqing Science & Technology Commission (No. cstcjjA00008)Fundamental Research Funds for the Central Universities (2012XZZX012)
文摘Rapid urbanization results in the conversion of natural soil to urban soil,and consequently,the storage and density of the soil carbon pools change.Taking Chongqing Municipality of China as a study case,this investigation attempts to better understand soil carbon pools in hilly cities.First,the vegetated areas in the study area were derived from QuickBird images.Then,topsoil data from 220 soil samples(0-20 cm) in the vegetated areas were collected and their soil organic carbon(SOC) densities were analyzed.Using the Kriging interpolation method,the spatial pattern of SOC was estimated.The results show that the SOC density exhibited high spatial variability in the urban topsoil of Chongqing.First,the SOC density in topsoil decreased according to slope in the order 2°-6° < 25°-90° < 0°-2° < 6°-15° < 15°-25°.Second,the newly developed areas during 2001-2010 had a lower SOC density than the areas built before 1988.Third,urban parks and gardens had a higher SOC density in topsoil,residential green land followed,and scattered street green land ranked last.For hilly cities,the variability of terrain affects the distribution of SOC.The Kriging results indicate that Kriging method combining slope with SOC density produced a high level of accuracy.The Kriging results show that the SOC density to the north of the Jialing River was higher than the south.The vegetated areas were estimated to amount to 73.5 km2 across the study area with an SOC storage of 0.192 Tg and an average density of 2.61 kg/m2.
基金Supported by National Modern Agriculture Industrial Technology System(CARS-09)Chongqing Natural Science Foundation(csct2012jjA80042)+1 种基金Highly-efficient Production Technology Research and Demonstration in Rice Field-upland Field Rotation at Scale(201303129)Integration and Demonstration of Cultivation and Supporting Technology of Rare Black Soybeans or Mung Beans(YCSTC,2012AC1006)~~
文摘To develop characteristic and profitable agriculture was proposed in the 4th congress of party representatives in Chongqing, based on Chongqing practical development in major cities, rural regions, mountain regions, and poverty-stricken areas. It would be effective for sustainable development and farmers’ income improvement. However, some existing problems should be well considered, including special geographical locations, unsatisfied application of science and technology in agriculture, loss of young labors and aging issues. In the research, the existing problems in developing characteristic and profitable agriculture were analyzed and the corresponding strategies were proposed as well.
文摘Objective: Male breast cancer is a rare disease with an incidence of about 1% of breast cancers in USA, but relatively lack of the information of male breast cancer in China, especially in Southwest of China, led us to study its incidence trends. Methods: Chongqing is one of the biggest and the most important areas that is located in Southwest of China. There are around 31.4 million people who live in approximate 82 402.95 km2area of Chongqing. Data about breast cancer patients registered in the Center for Disease Prevention and Control of Chongqing(China) were statistically collected from 187 hospitals, about 58 hospitals in city and 129 hospitals in country, and over 6.2 million people were studied every year. It was tried to represent all the people in villages and cities in Chongqing, China. Results: The incidence of male breast cancer in Southwest of China ranged from 0.34/100 000 to 1.45/100 000 between 2007 and 2011, while the incidence of female breast cancer ranged from 15.40/100000 to 21.66/100000 at the same time. The rate of male breast cancer to female breast cancer ranged from 0.02:1 to 0.07:1, male breast cancer accounted for 1.96% to 6.5%(with the mean value of 2.9%) of breast cancers in Southwest of China from 2007 to 2010. Conclusion: In Southwest of China male breast cancer accounts for about 2.9% of breast cancers which is higher than that in United States. It is important for policy makers and health manager to seriously consider breast cancer in future plan in Southwest of China.
基金Funded by the Natural Science Foundation of China (No. 59778021)
文摘An effective approach for describing complicated water quality processes is very important for river water quality management. We built two artificial neural network(ANN) models,a feed-forward back-propagation(BP) model and a radial basis function(RBF) model,to simulate the water quality of the Yangtze and Jialing Rivers in reaches crossing the city of Chongqing,P. R. China. Our models used the historical monitoring data of biological oxygen demand,dissolved oxygen,ammonia,oil and volatile phenolic compounds. Comparison with the one-dimensional traditional water quality model suggest that both BP and RBF models are superior; their higher accuracy and better goodness-of-fit indicate that the ANN calculation of water quality agrees better with measurement. It is demonstrated that ANN modeling can be a tool for estimating the water quality of the Yangtze River. Of the two ANN models,the RBF model calculates with a smaller mean error,but a larger root mean square error. More effort to identify out the causes of these differences would help optimize the structures of neural network water-quality models.
基金Funded by National Natural Science Foundation of China (40335049)
文摘Urban Agglomeration is an inevitable outcome of urbanization and industrialization, and a main form of urban development. Based on the analysis of urbanization and urban system situation, this paper will discuss the integration of urban agglomeration development, using the urban area of Cheng (Chengdu)-Yu (Chongqing) Urban agglomeration (CYUA) as a case study. By means of industries, population and spatial integrations, the function, strength and competition of CYUA will be improved and this urban agglomeration will transit from a budding state to a growing and mature one in future. The sustainable development of CYUA will depend on countermeasures, such as accelerating industrialization and urbanization, building a traffic network and express roads, strengthening the ability of self-sufficiency, enlarging the ecological construction and environmental protection, and establishing the synergetic institution of cross districts.
文摘Accompanying the development of social economy,the land use model of mountainous area,typically eco-weak area,is changing gradually. Here the establishment of eco-friendly land use model in mountainous area,will pioneer the model of sustainable development in that area. Concerning Qianjiang District of Chongqing Municipality,huge change of land use model,mainly embodied in the unceasing increase of construction land and gradual decrease of agricultural use land,has taken place in recent years. To explore the eco-friendly land use model in mountainous area,Qianjiang District was chosen as the study object in the present study. Via analyzing the changes in land use model,we found that related eco-environment restrictive factors mainly regional climatic change,soil texture,hydrological environment as well as soil erosion and land degradation,etc. And based on these results,we further analyzed the effect of land use change on eco-environment and the factors restricting the maintenance of eco-environment and regional development,finally put forward the counter measures for balancing land use and co-environment in mountainous area. The results will be important for the development of social economy and eco-system construction in Qianjiang District.
基金Supported by the Key Technologies R&D Program(No.2012 BAJ23B05)the National Natural Science Foundation of China(No.40701179)
文摘Based on the remote sensing images of urban land use of Chongqing City Proper in the last 30years(from 1978 to 2011),The paper focuses on the impact of urban spatial expansion on urban ecosystem service.The charactereristics of urban spatial expansion pattern are expressed by Landscape Expansion Index and Index of Fractal Dimension.Taking advantage of calculation of these two indices,changes of the ecological service values in the main urban area of Chongqing caused by the variation of urban expansion patterns are evaluated and the interrelationship is analyzed.The main conclusions and results are as follows;in Chongqing City Proper,the ecological service value decreased rapidly from 1978 to 2011,especially in the period of 2002-2011.Urban spatial expansion pattern has exerted significant impact on urban ecosystem service value.Edge-expansion pattern broke into a great deal of urban enclaves and caused the disadvantage effect of the function of urban ecological system.At the same time,negative correlation existed between the indices of fractal dimension and the ecosystem service value.
基金Under the auspices of Fundamental Research Funds for the Central Universities(No.XDJK2013B023)Natural Science Foundation of Zhejiang Province,China(No.LQ13D010003)
文摘What rural households think and what kind of strategies they take, the basic driving force in land use activities, contribute greatly to the increase of their own revenues, the development of agricultural yields, and even the prosperity of rural areas. Differentiation in rural household behaviors and their consciousness in land use activities is widespread in rural China nowadays. It is important to understand the changing characteristics and laws of land use behaviors of rural households driven by their consciousness, so as to regulate their land use activities. In most empirical studies of land use change at rural household level, the land use consciousness, which acts directly on land use behaviors, is often neglected. In our research, the changes of land use behaviors of rural households are analyzed, through identifying how the land use consciousness affect the land use objectives, land management scales and land inputs of all the rural households in Bailin Village of Chongqing Municipality in the western mountainous China. Also, how the land use consciousness of different rural households comes into being under external stimuli is examined and the self-adjustment process of their consciousness according to their own conditions is also discussed. Finally, broad policy instruments are suggested to promote the rationalization of rural households′ land use consciousness and the standardization of their land use behaviors.
基金sponsored by the Natural Science Foundation of China (Grant Nos.41172261 and 41472256)supported by the Scientific Research Fund of Sichuan Provincial Education Department (Grant Nos.13ZA0173 and 15ZA0121)
文摘Black shale is widely distributed in southern and western China.The swelling and breakdown characteristics of black shale are important physicomechanical properties in engineering activities.Aqueous solutions with different compositions exert various influences on the swelling characteristic of black shale because of the complexity of its composition.Soils derived from black shale are most commonly developed on black shales with bedded horizons that generally have cutting and weathering profiles.This paper reports an axial free swelling study for soils derived from black shales and developed in the Lower Cambrian black shales in Chengkou County,Chongqing Municipality,Southwest China.To discuss the swelling characteristics of black shale under the influence of cations,an axial free swelling test was conducted on black shale samples while considering the initial water content,weathering stage of black shale,and different cationic solutions with various concentrations.Results showed that the swelling deformation curve of black shale could be divided into three phases:acceleration,deceleration,and stability.The axial swelling ratio eventually decreased with increasing water content,and the axial free swelling rate changed with the free expansion model of the exponential relationship.Under a constant initial water content,the axial swelling rate increased with the intensity of black shale weathering in the same immersion solution.When different types of immersion solutions were used,the cationic price was high and the axial swelling rate increased with rising cation valence.The changes in the swelling ratio were significant at a valence of one or two.The results of this study provide further understanding of the engineering geological characteristics of black shale and the geological hazards caused by the swelling characteristics of black shale.
基金a corrosion subprogram of the international project Regional Air Pollution in Developing Countries under the contract No. JT73065.
文摘This paper presents the research on the atmospheric corrosion rates of carbon steel, zinc and copper in Chongqing, which was a corrosion subprogram of an international project, Regional Air Pollution in Developing Countries. We performed field exposure tests of carbon steel, zinc and copper at an urban site Guanyinqiao and a rural site Tieshanping inChongqing, then used grey relational analysis, based on the database of the whole corrosion project, to determine the order of the effect of environmental factors on corrosion rates of tested metals, and established dose-response functions for these three metals. The results showed that the two crucial agents of acidic environment, SO2 and H+, were common factors that contributed most to the corrosion of the tested metals. The established dose-response functions for outdoor carbon steel and zinc are proved applicable to use in Chongqing, but the function for copper needs further modifying. We employed these dose- response functions and general environmental data to elaborate the maps of corrosion rate respectively of carbon steel and zinc by geological information system (GIS) technique which help to identify areas of high corrosion damage risk. An acceptable annual average SO2 level of 21 μg/m3 for carbon steel and that of 61 μg/m3 for zinc are also put forward to control the air pollution impact on atmospheric corrosion in Chongqing urban areas.
文摘In 2015, the area of first and second class land in Tongnan Distdct of Chongqing was 221.646 km2, accounting for 30% of the total cultivated area, and the area of the third, fourth and fifth class land was 517.861 km2, accounting for 70% of the total cultivated area. The quality of cultivated land was at a low level. Comparison with the Second Soil Census in 2015 showed that the soil pH value has been improved; the organic matter content in the tillage layer showed a slight upward trend; the contents of available nitrogen, available phosphorus and available potassium in the topsoil increased. Countermeasures were proposed as follows: vig- orously promote the construction of high-standard farmland; adjust the industrial structure of agriculture and implement farming reform; combine organic and inorgan- ic fertilization to reduce the amount of fertilizers; popularize soil testing and formu- lated fertilization to change farmers' traditional fertilization habits; improve pollution control to ensure the sustainable productivity of farmland; strictly promote the quality management of cultivated land and strengthen the construction of quality monitoring system; increase investment and improve the monitoring mechanism; vigorously publicize and enhance the awareness of all citizens in protecting cultivated land; im- prove the law of cultivated land protection and enhance the seriousness of the law on the protection of cultivated land.
文摘To fully analyze emission characteristics of VOCs (Volatile Organic Compounds) from automobile coating industry in Chongqing city, related enterprises in the city were investigated in detail. The results show that the emission of VOCs from the automobile industry in Chongqing city was approximately 20,000 t in 2012, and the contribution rate of automobile coating was 83%. Most VOCs discharged from automobile coating industry were mainly from the use of coatings, diluents, curing agents and other materials containing VOCs. During the process of automobile coating, VOCs were mainly produced during the processes of spraying and drying. Besides, VOCs are partly produced during the processes of mixing paint, gluing, waxing and repairing. The major ingredients of VOCs discharged during the process of automobile coating were methylbenzene, dimethylbenzene, trimethylbenzene, cumene, ethyl acetate, butyl alcohol, n-butyl alcohol, isobutyl alcohol, formaldehyde, butanone, acetone, cyclohexanone and methyl ethyl ketone. Besides, the ingredients of naphtha and aromatic hydrocarbon in VOCs need to be determined. The maximum OFP (Ozone Formation Potential) of the above pollutants by the typical enterprises was 900-1,300 mg/m^3. The production of SOA (Secondary Organic Aerosol) was 3,636-11,073 t/a, which didn’t include the contribution of aldehydes, ketones, ethers and esters to SOA. This research could provide scientific reference for the establishment of emission standard, control technology and management methods of VOCs from automobile coating industry that accord with economic and social development in Chongqing city.
文摘Daqing is a mining city that was set up on wetland by exploiting and processing petroleum.This paper points out that net-group urban system is the optimization mode for Daqin g urban spatial structure through an alyzing and appraising the present situation,c haracteristics,advantages and dis advantages of Daqing spatial structure.And the best way of optimizing Daqing urban spatial structure is to adopt sustainable development strategy,establish th e coordinated grade structure of urban system,con struct developed towns net system,p refect the function structure of the towns at all levels,make full use of resources an d strengthen environmental protection.Spatial structure of Daqing must be according-ly adjusted in order to adapt to the tr ansformation of future economy types and functions.Based on the foundation of keep-ing net group,the development shoul d be from disperse to moderate centra lization in order to give prominence to the multi-function of the central city.Constr ucting ruralizing city should be the future goal of Daqing City.
文摘The private hospital has increased the capacity of health service delivery in number and is going to become an important supplement for medical resources. The thesis is combined with the actual situation of Chongqing Tongkang Orthopedic Hospital after its opening within half a year, so as to discuss the enlightenment from the position of medical institution, the performance management, the hospital culture and competitive environment at the beginning of the private hospital's foundation.
文摘According to the essential features of urban economic strips, this paper is intended to point out that Chengdu-Chongqing strip has so far been an urban area in geographic or spatial sense, but not an urban economic strip in economic sense.On further basis of analyzing several problems existing inthe development of Chengdu-Chongqing economic strip,some countermeasures are correspondingly put forward hereafter.
文摘On June 15th 2005, Russian crude oil unloading reconstruction project of Nansan oil store, which has drawn much attention of the state, China National Petroleum Corporation (CNPC) and Daqing Oilfield, was successfully accomplished and put into operation, marking the start of large scale import of Russian crude and opening up a new era for Daqing Oilfield to involve in foreing crude trade.