To solve the contradiction between supply and demand of land, the con- struction of land resource security guarantee system is an important part to coordi- nate the economic development and cultivated land protection ...To solve the contradiction between supply and demand of land, the con- struction of land resource security guarantee system is an important part to coordi- nate the economic development and cultivated land protection in the core grain pro- duction region. Based on the deep analysis on the land resources characteristics and problems using the combined method of literature review method with qualita- tive and quantitative analysis, we constructed the land resource security system for different categories according to the land use principles of optimization, intensivism, improvement, and overall planning, and proposed the corresponding supporting mea- sures. The results showed that controlling the new increase, promoting the reclama- tion and improvement of land are the basis for land resource security, clearing the idle, improving the utilization rate of stock are the core of the efficient use of land resources, and establishing a unified urban and rural construction land market is the key to promoting the economical and intensive utilization of land resources, provid- ing scientific basis for the sustainable utilization of land resources in the core grain production regions.展开更多
The characteristic and status quo of plant biodiversity in Longtan Nature Reserve was evaluated from the three aspects of species diversity, genetic diversity and ecosystem dioversity. And the primary eco-safety influ...The characteristic and status quo of plant biodiversity in Longtan Nature Reserve was evaluated from the three aspects of species diversity, genetic diversity and ecosystem dioversity. And the primary eco-safety influencing factors for plant biodiversity in Longtan nature reserve were put forward. The results show that the plant species in Longtan Nature Reserve was abundant, including 2 821 species of vascular bundle plants belonging to 1029 genera, 205 families. The main problems influencing eco-safety included the destruction of endangered wild plants and exotic species invasion.展开更多
The nature heritages are the precious legacy of nature with outstanding scientific and aesthetic value. They are quite different from other common ecotourism areas, because of its original and unique system, sensitive...The nature heritages are the precious legacy of nature with outstanding scientific and aesthetic value. They are quite different from other common ecotourism areas, because of its original and unique system, sensitive and vulnerable landscape, and peripheral cultural features. Therefore, the tourism development in the nature heritage sites should be on the premise of ecological security. The evaluation index system of tourism ecological security in nature heritage sites was constructed in this article by AHP and Delphi methods, including nature ecological security, landscape visual security and local culture ecological security, and the security thresholds of indices were also established. In the indices' weights of the evaluation model, the nature ecological security ranked the highest, followed by tourist landscape visual security and culture ecological security, which reflected the influence degree of the limited factor to tourism ecological security. Then, this paper carried out an empirical study of Kanas of Xinjiang Uygur Autonomous Region, China, which has the potential to be the World Nature Heritage. On the basis of the data attained from survey and observation on the spot, as well as questionnaire answered by tourists and local communities, the ecological security status in Kanas was evaluated. The result showed that the status of Kanas tourism ecological security was better, but there had some limiting factors. Lastly, effective measures were put forward to ensure its ecological security.展开更多
Since 1790, Antarctic living resources were becoming subjects of competition among the exploiters to be first in obtaining the maximum profit from them. This led to subsequent extinction of valuable species from fur s...Since 1790, Antarctic living resources were becoming subjects of competition among the exploiters to be first in obtaining the maximum profit from them. This led to subsequent extinction of valuable species from fur seals and next penguins, large through small whales, industrial demersal fish, further to pelagic species and now toothfish, crabs and krill. Catch proportions of their numerous and biomass decrease. The biomass of South Georgia Icefish estimated for 40 years in spide of decreasing trend has one of the largest components-the oscillations with periods of 3 years or 4 years. Their models explain large biomass fluctuations in the years 1975 to 1981 with amplitudes ±15 × 10^3 tonnes around average 20 ×10^3 tonnes and further decline up to 2005 season with oscillation ±4 ×10^3 tonnes around average 5 × 10^3 tonnes. For future season, 2016 model predicts a little increase of the biomass oscillation at level of 8 × 10^3 tonnes with reduced amplitude 2 × 10^3 tonnes. Slowly increase density of adult fish was also reported for target similar and close related mackerel icefish. Additional references for biomass levels help reduce the risk of further depletion biomass of Pseudochaenichthys georgianus which already declined to 75%. As global warming promote phytoplankton growth, replacing krill fishery by algae farms can save unique Antarctic heritages.展开更多
With the accelerating process of urbanization and industrialization, the peasants for loss of land use fights has become a universal social phenomenon, the problem of landless peasants old-age security community has a...With the accelerating process of urbanization and industrialization, the peasants for loss of land use fights has become a universal social phenomenon, the problem of landless peasants old-age security community has aroused much attention. However, the presence of Hefei landless peasants pension current pension system is not perfect, the shortcomings of the current government policy, peasants lack insurance awareness and so on. This paper argucs that the land should bc constructed by the pension insurance system, improvc the land compensation policy, increase financial input and improve peasants＇ pension fund supervision and management mechanism to ensure the standardization of the system, thereby providing an important guarantee for building a socialist new urbanization.展开更多
In recent decades,the continuous growth in the population has significantly changed the area of human settlements across the globe.The change of human settlements has brought great challenges to human development,envi...In recent decades,the continuous growth in the population has significantly changed the area of human settlements across the globe.The change of human settlements has brought great challenges to human development,environmental change,resource allocation,and disaster prediction and prevention.In the current paper,we integrate data products provided by the European Commission,Joint Research Centre with multi-source remote sensing data to analyze the changing trends of global human settlements under varying geographical distributions from 1990 to 2014.The results demonstrate that on the global scale,human settlements are generally distributed in Europe,East Asia,Southeast Asia,South Asia,the eastern United States,the Gulf Coast and the coast of Oceania,with most of them distributed in urban agglomerations and coastal areas.Global human settlements have continued to grow over the past 25 years,mainly in East Asia,Western Europe and the United States.The area of human settlements in eastern Europe has been slightly reduced.The distribution of human settlements is affected by climate,water and terrain conditions.Humans were more likely to have settled in temperate regions with wetter climates,and most of the human settlements are located within 500 km of the coastline and 30 km of land-based water sources.Our results can provide insights into further investigations of the spatio-temporal dynamics of human settlements and its connections to ecological and environmental issues in a changing world.展开更多
文摘To solve the contradiction between supply and demand of land, the con- struction of land resource security guarantee system is an important part to coordi- nate the economic development and cultivated land protection in the core grain pro- duction region. Based on the deep analysis on the land resources characteristics and problems using the combined method of literature review method with qualita- tive and quantitative analysis, we constructed the land resource security system for different categories according to the land use principles of optimization, intensivism, improvement, and overall planning, and proposed the corresponding supporting mea- sures. The results showed that controlling the new increase, promoting the reclama- tion and improvement of land are the basis for land resource security, clearing the idle, improving the utilization rate of stock are the core of the efficient use of land resources, and establishing a unified urban and rural construction land market is the key to promoting the economical and intensive utilization of land resources, provid- ing scientific basis for the sustainable utilization of land resources in the core grain production regions.
基金Supported by Scientific Research Program of Guangxi Provincial Department of Education(201103YB128,201010LX500)Key scientific research project of Baise University(2012KA02)+1 种基金Integrated Construction Program of Characteristic Biotechnology Majors and Courses(GXTSZY224)2011 Young Teachers Growth Foundation of Baise University~~
文摘The characteristic and status quo of plant biodiversity in Longtan Nature Reserve was evaluated from the three aspects of species diversity, genetic diversity and ecosystem dioversity. And the primary eco-safety influencing factors for plant biodiversity in Longtan nature reserve were put forward. The results show that the plant species in Longtan Nature Reserve was abundant, including 2 821 species of vascular bundle plants belonging to 1029 genera, 205 families. The main problems influencing eco-safety included the destruction of endangered wild plants and exotic species invasion.
基金Under the auspices of National Natural Science Foundation of China (No. 40671057)Knowledge Innovation Pro-grams of Chinese Academy of Sciences (No. KZCX3-SW-355)
文摘The nature heritages are the precious legacy of nature with outstanding scientific and aesthetic value. They are quite different from other common ecotourism areas, because of its original and unique system, sensitive and vulnerable landscape, and peripheral cultural features. Therefore, the tourism development in the nature heritage sites should be on the premise of ecological security. The evaluation index system of tourism ecological security in nature heritage sites was constructed in this article by AHP and Delphi methods, including nature ecological security, landscape visual security and local culture ecological security, and the security thresholds of indices were also established. In the indices' weights of the evaluation model, the nature ecological security ranked the highest, followed by tourist landscape visual security and culture ecological security, which reflected the influence degree of the limited factor to tourism ecological security. Then, this paper carried out an empirical study of Kanas of Xinjiang Uygur Autonomous Region, China, which has the potential to be the World Nature Heritage. On the basis of the data attained from survey and observation on the spot, as well as questionnaire answered by tourists and local communities, the ecological security status in Kanas was evaluated. The result showed that the status of Kanas tourism ecological security was better, but there had some limiting factors. Lastly, effective measures were put forward to ensure its ecological security.
文摘Since 1790, Antarctic living resources were becoming subjects of competition among the exploiters to be first in obtaining the maximum profit from them. This led to subsequent extinction of valuable species from fur seals and next penguins, large through small whales, industrial demersal fish, further to pelagic species and now toothfish, crabs and krill. Catch proportions of their numerous and biomass decrease. The biomass of South Georgia Icefish estimated for 40 years in spide of decreasing trend has one of the largest components-the oscillations with periods of 3 years or 4 years. Their models explain large biomass fluctuations in the years 1975 to 1981 with amplitudes ±15 × 10^3 tonnes around average 20 ×10^3 tonnes and further decline up to 2005 season with oscillation ±4 ×10^3 tonnes around average 5 × 10^3 tonnes. For future season, 2016 model predicts a little increase of the biomass oscillation at level of 8 × 10^3 tonnes with reduced amplitude 2 × 10^3 tonnes. Slowly increase density of adult fish was also reported for target similar and close related mackerel icefish. Additional references for biomass levels help reduce the risk of further depletion biomass of Pseudochaenichthys georgianus which already declined to 75%. As global warming promote phytoplankton growth, replacing krill fishery by algae farms can save unique Antarctic heritages.
文摘With the accelerating process of urbanization and industrialization, the peasants for loss of land use fights has become a universal social phenomenon, the problem of landless peasants old-age security community has aroused much attention. However, the presence of Hefei landless peasants pension current pension system is not perfect, the shortcomings of the current government policy, peasants lack insurance awareness and so on. This paper argucs that the land should bc constructed by the pension insurance system, improvc the land compensation policy, increase financial input and improve peasants＇ pension fund supervision and management mechanism to ensure the standardization of the system, thereby providing an important guarantee for building a socialist new urbanization.
基金The National Science and Technology Key Project(2016YFB0502301)。
文摘In recent decades,the continuous growth in the population has significantly changed the area of human settlements across the globe.The change of human settlements has brought great challenges to human development,environmental change,resource allocation,and disaster prediction and prevention.In the current paper,we integrate data products provided by the European Commission,Joint Research Centre with multi-source remote sensing data to analyze the changing trends of global human settlements under varying geographical distributions from 1990 to 2014.The results demonstrate that on the global scale,human settlements are generally distributed in Europe,East Asia,Southeast Asia,South Asia,the eastern United States,the Gulf Coast and the coast of Oceania,with most of them distributed in urban agglomerations and coastal areas.Global human settlements have continued to grow over the past 25 years,mainly in East Asia,Western Europe and the United States.The area of human settlements in eastern Europe has been slightly reduced.The distribution of human settlements is affected by climate,water and terrain conditions.Humans were more likely to have settled in temperate regions with wetter climates,and most of the human settlements are located within 500 km of the coastline and 30 km of land-based water sources.Our results can provide insights into further investigations of the spatio-temporal dynamics of human settlements and its connections to ecological and environmental issues in a changing world.
