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Assessment of habitat suitability of the snow leopard (Panthera uncia) in Qomolangma National Nature Reserve based on MaxEnt modeling 被引量:21
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作者 De-Feng Bai Peng-Ju Chen +3 位作者 Luciano Atzeni Lhaba Cering Qian Li Kun Shi 《Zoological Research》 SCIE CAS CSCD 2018年第6期373-386,共14页
Habitat evaluation constitutes an important and fundamental step in the management of wildlife populations and conservation policy planning. Geographic information system (GIS) and species presence data provide the ... Habitat evaluation constitutes an important and fundamental step in the management of wildlife populations and conservation policy planning. Geographic information system (GIS) and species presence data provide the means by which such evaluation can be done. Maximum Entropy (MaxEnt) is widely used in habitat suitability modeling due to its power of accuracy and additional descriptive properties To survey snow leopard populations in Qomolangma (Mt. Everest) National Nature Reserve (QNNR), Xizang (Tibet), China, we pooled 127 pugmarks, 415 scrape marks, and 127 non-invasive identifications of the animal along line transects and recorded 87 occurrences through camera traps from 2014-2017. We adopted the MaxEnt model to generate a map highlighting the extent of suitable snow leopard habitat in QNNR. Results showed that the accuracy of the MaxEnt model was excellent (mean AUC=0.921). Precipitation in the driest quarter, ruggedness, elevation, maximum temperature of the warmest month, and annual mean temperature were the main environmental factors influencing habitat suitability for snow leopards, with contribution rates of 20.0%, 14.4%, 13.3%, 8.7%, and 8.2% respectively The suitable habitat area extended for 7 001.93 km^2, representing 22.72% of the whole reserve. The regions bordering Nepal were the main suitable snow leopard habitats and consisted of three separate habitat patches Our findings revealed that precipitation, temperature conditions, ruggedness, and elevations of around 4 000 m a.s.I, influenced snow leopard preferences at the landscape level in QNNR. We advocate further research and cooperation with Nepal to evaluate habitat connectivity and to explore possible proxies of population isolation among these patches. Furthermore, evaluation of subdivisions within the protection zones of QNNR is necessary to improve conservation strategies and enhance protection. 展开更多
关键词 Qomolangma national nature reserve Snow leopard MAXENT Habitat suitability assessment TIBET
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Estimation on Aesthetic Value of Tourist Landscapes in a Natural Heritage Site:Kanas National Nature Reserve,Xinjiang,China 被引量:11
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作者 DI Feng YANG Zhaoping +2 位作者 LIU Xuling WU Jingrui MA Zhongguo 《Chinese Geographical Science》 SCIE CSCD 2010年第1期59-65,共7页
Most world natural heritage sites are designated partly by reason of their prominent aesthetic values in accordance with Article Ⅶ of World Natural Heritage Convention.In this paper, the aesthetic values of Kanas Nat... Most world natural heritage sites are designated partly by reason of their prominent aesthetic values in accordance with Article Ⅶ of World Natural Heritage Convention.In this paper, the aesthetic values of Kanas National Nature Reserve, which has potential for such designation, was analyzed quantitatively using scenic beauty estimation(SBE).The landscapes of 19 representative scenic spots in the Kanas National Nature Reserve in summer and autumn were selected as the objects of evaluation.The contributions of different landscape factors to the aesthetic value of the Kanas National Nature Reserve were revealed using a multivariate quantitative model.The main factors affecting the aesthetic value were waterscapes, vegetation, mountains, folk culture and the tourist environment.The t-test and F-test results are extremely significant.According to the results, some suggestions were given for conserving the landscapes in the Kanas National Nature Reserve. 展开更多
关键词 Kanas national nature reserve aesthetic value scenic beauty estimation World Natural Heritage Xinjiang
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Carbon storage of a subtropical forest ecosystem: a case study of the Jinggang Mountain National Nature Reserve in south-eastern China 被引量:3
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作者 Jiping Zhang Linbo Zhang +2 位作者 Haiguang Hao Chunlan Liu Hui Wang 《Journal of Forestry Research》 SCIE CAS CSCD 2019年第3期1011-1021,共11页
The carbon cycle of forest ecosystems plays a key role in regulating CO2 concentrations in the atmosphere. Research on carbon storage estimation of forest ecosystems has become a major research topic. However, carbon ... The carbon cycle of forest ecosystems plays a key role in regulating CO2 concentrations in the atmosphere. Research on carbon storage estimation of forest ecosystems has become a major research topic. However, carbon budgets of subtropical forest ecosystems have received little attention. Reports of soil carbon storage and topographic heterogeneity of carbon storage are limited. This study focused on the Jinggang Mountain National Nature Reserve as an example of a mid-subtropical forest and evaluated soil and vegetation carbon storage by field sampling combined with GIS, RS and GPS technology. We classified the forest into nine forest types using ALOS high-resolution remote sensing images. The evergreen broad-leaved forest has the largest area, occupying 26.5% of the total area, followed by coniferous and broad-leaved mixed forests and warm temperate coniferous forest, occupying 24.2 and 22.9%, respectively. The vegetation and soil carbon storage of the whole forest ecosystem were 1,692,344 and 5,514,707 t, with a carbon density of 7.4 and 24.2 kg/m^2, respectively, which suggests that the ecosystem has great carbon storage capacity. The topographic heterogeneity of the carbon storage was also analysed. The largest vegetation storage and soil storage is at 700–800 and 1000–1100 m, respectively. The vegetation carbon storage is highest in the southeast, south and southwest. 展开更多
关键词 Vegetation CARBON STORAGE Soil CARBON STORAGE Mid-subtropical forest ecosystem Jinggang MOUNTAIN national nature reserve
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Study on the Current Situation and Protection Countermeasures of Wild Plant Resources in Xishuangbanna National Nature Reserve 被引量:3
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作者 YANG Zhong-xing1, YIN Wu-yuan2, AI Jian-lin1 1. Yunnan Forestry Inventory and Planning Institute, Kunming 650051, China 2. Southwest Forestry University, Kunming 650224, China 《Meteorological and Environmental Research》 CAS 2011年第4期79-82,共4页
[Objective] The aim was to study the current situation and protection countermeasures of wild plant resources in Xishuangbanna National Nature Reserve. [Method] The current situation of wild plant resources in Xishuan... [Objective] The aim was to study the current situation and protection countermeasures of wild plant resources in Xishuangbanna National Nature Reserve. [Method] The current situation of wild plant resources in Xishuangbanna National Nature Reserve was researched by means of route survey, sample plot survey and literature survey, and then the main impact factors of wild plant resources were analyzed by using participatory rural appraisal and problem tree analysis, finally protection countermeasures were put forward according to current situation and main impact factors. [Result] There were 2 779 species of vascular plants belonging to 214 families and 1 012 genera (including subfamilies and varieties) in Xishuangbanna National Nature Reserve, among them, there existed 261 species of pteridophyte belonging to 41 families and 91 genera, 14 species of gymnosperm belonging to 6 families and 6 genera, and 2 504 species of angiosperm belonging to 167 families and 915 genera. Wild plant resources in reserve were mainly affected by planting under forest, habitat fragmentation, cutting trees, collection and utilization of no-timber products, development of animal husbandry, insufficient recognition of community residents to reserve management establishment and lots of floating population. In the future, wild plant resources in reserve could be protected through strengthening propaganda, education and management, enforcing the law strictly and other countermeasures. [Conclusion] The study could provide theoretical foundation for the protection of wild plant resources in Xishuangbanna National Nature Reserve. 展开更多
关键词 Wild plant resources Protection countermeasures Impact factors national nature reserve XISHUANGBANNA China
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Non-use value assessment for wetland ecosystem service of Hongxing National Nature Reserve in northeast China 被引量:1
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作者 Xin Jin Jianzhang Ma +1 位作者 Tijiu Cai Xiaoxin Sun 《Journal of Forestry Research》 SCIE CAS CSCD 2016年第6期1435-1442,共8页
By the contingent value method, we studied the non-use value of wetland ecosystem service of Hongxing National Nature Reserve (HNNR) in Heilongjiang Pro- vince, northeast China. The proportion of respondents willing... By the contingent value method, we studied the non-use value of wetland ecosystem service of Hongxing National Nature Reserve (HNNR) in Heilongjiang Pro- vince, northeast China. The proportion of respondents willing to pay (WTP) for protection of HNNR was 63 %. The WTP ratio was affected by geographical area, contact nature, personal preferences, and familiar degree of the respondents. The WTP value was affected by age, education level and career of the respondents. The mainly reasons for people rejecting to pay for protecting HNNR were "I am not familiar to HNNR" and "I had no capacity for additional spending because of low income". Weighted average individual WTP value was CNY 59.26 Yuan ind.^-1 year^-1 for all the respondents with WTP. The total non-use ecosystem service value of HNNR was CNY 1430 million Yuan in 2013. The heritage value was highest followed by existence value and option value. From the high ecosystem service value in HNNR, it is very important to construct nature reserve for protecting natural ecosystems and human sustainable use of natural resources. 展开更多
关键词 Ecosystem service Non-use value Hongxing national nature reserve - Xiaoxing'an Mountains
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Habitat Utilization of the Golden Takin During Later Autumn and Winter in Foping National Nature Reserve 被引量:5
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作者 SONG YANLING YU YUQUN +1 位作者 GONG HUISHENG ZHANG SHANNING 《生物多样性》 CAS CSCD 1995年第B06期73-78,共6页
关键词 生活环境利用 金羚牛 阔叶落叶林 佛坪国家级自然保护区
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Evaluation of nest site preferences of a nest dismantler,the Hair-crested Drongo(Dicrurus hottentottus) in Dongzhai National Nature Reserve of central China 被引量:1
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作者 Andrew Cantrell Lei Lv +2 位作者 Yong Wang Jianqiang Li Zhengwang Zhang 《Chinese Birds》 CSCD 2016年第2期125-131,共7页
Background:The Hair-crested Drongo(Dicrurus hottentottus) exhibits a unique nest-dismantling behavior after the fledging of the young.One hypothesis explaining this behavior is dismantling one's own nest may reduc... Background:The Hair-crested Drongo(Dicrurus hottentottus) exhibits a unique nest-dismantling behavior after the fledging of the young.One hypothesis explaining this behavior is dismantling one's own nest may reduce potential competition for nest sites in the following breeding season because suitable breeding habitat might be limited,and sites are often reused.Methods:By comparing the habitat features at nest and random locations,we determined the nest habitat preference of the Hair-crested Drongo within Dongzhai National Nature Reserve,Henan,China.We also compared habitat features with nesting success to determine if any trends could be detected.Results:We found that nest tree height,diameter at breast height,live crown ratio,tree rank,and presence of overstory were significantly higher at nesting locations than random locations;slope,leaf litter cover percentage and depth,presence of understory and midstory,and number of trees per hectare were significantly lower at nest sites than random sites.Drongos preferred to use some tree species,such as Metasequoia glyptostroboides,Castanea mollissima,and Pterocarya stenoptera for nesting.Failed nests were often associated with habitat with higher percentage of leaf litter on the ground.Conclusion:Our data support that selection of nest sites does occur for this species at this site and therefore support the hypothesis that breeding habitat limitation could be one of the driving forces for the development of the nestdismantling behavior in this species. 展开更多
关键词 Hair-crested Drongo NEST DISMANTLING behavior NEST site selection China Dongzhai national nature reserve
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Spatial variations of Pb in the vertical zone of the soil-plant system in the Changbai Mountain National Nature Reserve
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作者 BaiJH DengW 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2002年第3期325-329,共5页
The characteristics of vertical and horizontal variations of lead element(Pb) in soil plant system of vertical zone in Changbai Mountain National Nature Reserve(CNNR) were studied. The results showed that Pb concentr... The characteristics of vertical and horizontal variations of lead element(Pb) in soil plant system of vertical zone in Changbai Mountain National Nature Reserve(CNNR) were studied. The results showed that Pb concentrations in soils of vertical zone are all above 25 mg/kg, and the average Pb concentration of each soil zone negatively correlates its degree of variation, i.e. brown coniferous forest soil zone has the lowest average Pb concentration of four soil zones, and the highest horizontal variation; however, mountain soddy forest soil has the highest average Pb concentration, and the lowest horizontal variation; the average concentration of plant Pb of each plant zone is lower than the worldwide average level of Pb in plant(Clarke), respectively, and plant Pb content order is consistent with soil Pb content order, but their horizontal variations are different from those in soil zones, the variation of mountain tundra forest zone is highest, but Betula ermanii forest zone the lowest. Vertical variation of plant Pb is obviously higher than that in soils with variation coefficient of 89.76%; the enrichment capability of plant for Pb is depended on the plant types and the different organs of plant; parent material and parent rock, pH values, soil organic matter and soil particle fraction etc. are the main factors influencing variations of Pb content in soil plant system of vertical zone in CNNR. 展开更多
关键词 PB variation characteristics soil plant system vertical zone Changbai Mountain national nature reserve
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Population Density and Habitat Utilization of Ibex(Capra ibex)in Tomur National Nature Reserve,Xinjiang,China 被引量:9
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作者 徐峰 马鸣 吴逸群 《Zoological Research》 CAS CSCD 北大核心 2007年第1期53-55,共3页
Surveys was conducted to study the population density and habitat utilization of the ibex (Capra ibex) in Tomur National Nature Reserve during October- December 2005. The results are as follows: ① The mean group s... Surveys was conducted to study the population density and habitat utilization of the ibex (Capra ibex) in Tomur National Nature Reserve during October- December 2005. The results are as follows: ① The mean group size of the ibex in Tomur Nature Reserve is 8.43 and the population density is 269.76/100 km^2; ② The ibex prefer areas with steep slope (between 30° -45°), broken substrates and cliffs nearby ( 〈 100 m). They avoid grasslands and fiat hillsides; ③The probable reason for this habitat selection is serf-protection. 展开更多
关键词 IBEX POPULATION Habitat utilization Tomur national nature reserve
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Study on the Landcover Changes Based on GIS and RS Technologies: A Case Study of the Sanjiangyuan National Nature Reserve in the Hinterland Tibet Plateau, China
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作者 Renjie Zhao Qingsong Du 《Journal of Geoscience and Environment Protection》 2022年第1期140-150,共11页
<div style="text-align:justify;"> With global warming and increased human activity, more and more ground surface areas have been affected, which leads to the creation of many problems. To understand th... <div style="text-align:justify;"> With global warming and increased human activity, more and more ground surface areas have been affected, which leads to the creation of many problems. To understand the ecological environment changes in a typical alpine region, information on landcovers changes in the study area from 2000 to 2020 was obtained by combining remote sensing, geographic information system, and traditional statistical analysis for the Sanjiangyuan National Nature Reserve on the Qinghai-Tibet Plateau, China. The results show that the changes of surface cover in Sanjiangyuan National Nature Reserve are relatively concentrated, mainly distributed in the sections of south, northwest, central, and northeast, with the area of the changed regions and the unchanged regions being 31,127.45 km<sup>2</sup> and 271,941.37 km<sup>2</sup>, respectively. The transformation between the various types of ground landcover is mainly characterized by a shift from other types to grassland and from grassland to bare land. And the regions of change are mostly concentrated between 3500 - 4600 m in elevation. </div> 展开更多
关键词 Sanjiangyuan national nature reserve (SNNR) Alpine Region Qinghai-Tibet Plateau (QTP) Landcover Change GIS and RS
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Estimation of Recreational Value of Lotus Mountain National Nature Reserve,China
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作者 何爱红 王森 王亦龙 《Journal of Landscape Research》 2011年第3期64-67,共4页
Recreational sightseeing has already become an important content of modern people' life.With intensive and diversified natural and cultural landscapes,such as forest,rare animal species,folk customs of many minori... Recreational sightseeing has already become an important content of modern people' life.With intensive and diversified natural and cultural landscapes,such as forest,rare animal species,folk customs of many minorities,Lotus Mountain National Nature Reserve is of high tourist value.Proper evaluation of its recreational value is essential for the reasonable development and protection of its resources,the sustainable utilization and development of its environment and resources.Questionnaires and Expenditure Method were applied in this study for the monetization assessment of the recreational value of Lotus Mountain National Nature Reserve,which was obtained as 703 050 Yuan(RMB)in 2009.By not considering the factors not mentioned in the calculation and possible errors,such a result implied a relatively high recreational value.Given the fact that its recreational value has been influenced by diversified factors such as time,domestic and global tourism development,tourism policies,tourism planning,construction and management of the nature reserve,the authors suggested that the recreational value of Lotus Mountain National Nature Reserve could be promoted by improving its tourist facilities and enhancing the propagation. 展开更多
关键词 LOTUS MOUNTAIN national nature reserve EXPENDITURE Method Assessment
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The Systematic Diagnoses and Analysis of the Eco-vulnerability in Daqinggou National Natural Reserve
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作者 丛林 王建中 刘艺军 《Agricultural Science & Technology》 CAS 2013年第5期771-775,779,共6页
[Objective] The aim is to conduct systematic diagnoses on the eco-vulnerability in Daqinggou National Natural Reserve. [Method] A kind of "problem pile" is proposed about 58 interrelated problems of ecological vulne... [Objective] The aim is to conduct systematic diagnoses on the eco-vulnerability in Daqinggou National Natural Reserve. [Method] A kind of "problem pile" is proposed about 58 interrelated problems of ecological vulnerability by field survey and questionnaires and a ladder diagram of interrelations among the problems is established. The root problems, basic problems, core problems, interrelation and solving approaches are proposed, as well. [Result] It can be concluded from system diagnosis that fragile ecosystem of the Reserve can be observed from poor disasterresistibility, lower species diffusivity, lower system metabolism and poor system restorability. According to system diagnoses, management planning and control subsystem is key for protection of system vulnerability and solving different problems in process-oriented system. Conservation of the Reserve and ecological education on tourists are indispensible. It can be concluded from diagnoses that plant updating, evolution and ill growth in the Reserve are the focus of the vulnerable ecosystem, which influence species diffusivity, system metabolism and restorability and constitute central nodes of process-oriented and effect-oriented subsystems. [Conclusion] The research provides references for solving vulnerability issues of conservation and tourism management in Daqinggou National Nature Reserve. 展开更多
关键词 System diagnosis ECO-TOURISM Vulnerability of eco-system Daqinggou national Natural reserve
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An Observation of Franois' Langurs Using Caves at Mayanghe National Nature Reserve, Guizhou, China 被引量:7
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作者 Cyril C.Grueter 丁伟 《Zoological Research》 CAS CSCD 北大核心 2006年第5期558-560,共3页
The utilization of caves is a rather rare phenomenon in nonhuman primates, found almost exclusively in those members of the genus Trachypithecus that share a preference for forest on limestone (karst) hills in Vietn... The utilization of caves is a rather rare phenomenon in nonhuman primates, found almost exclusively in those members of the genus Trachypithecus that share a preference for forest on limestone (karst) hills in Vietnam and southern China. Here we report a new case of usage of caves as overnight sleeping shelters by Franqois' or black langurs (Trachypithecusfraru;oisi) at Mayanghe National Nature Reserve in Yanhe County, Guizhou Province, China. We tentatively address three possible hypotheses that may account for the use of caves in Francois' langurs at Mayanghe: shelter against climatic conditions, acquisition of minerals and protection from predators. utilization 展开更多
关键词 Francois' langurs Guizhou Mayanghe national nature reserve Cave utilization
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Rhizosphere and bulk soil enzyme activities in a Nothotsuga longibracteata forest in the Tianbaoyan National Nature Reserve,Fujian Province,China 被引量:8
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作者 Shihong Xiao Huiming You +8 位作者 Weibin You Jinshan Liu Changtang Cai Jianqin Wu Zhirong Ji Shihua Zhan Zhesen Hu Zhongrui Zhang Dongjin He 《Journal of Forestry Research》 SCIE CAS CSCD 2017年第3期521-528,共8页
The rhizosphere, distinct from bulk soil, is defined as the volume of soil around living roots and influenced by root activities. We investigated protease, invertase, cellulase, urease, and acid phosphatase activities... The rhizosphere, distinct from bulk soil, is defined as the volume of soil around living roots and influenced by root activities. We investigated protease, invertase, cellulase, urease, and acid phosphatase activities in rhizosphere and bulk soils of six Nothotsuga longibracteata forest communities within Tianbaoyan National Nature Reserve, including N. longibracteata + either Phyllostachys pubescens, Schima superba, Rhododendron simiarum, Cunninghamia lanceolata, or Cyclobalanopsis glauca, and N. longibracteata pure forest. Rhizosphere soils possessed higher protease, invertase, cellulase, urease, and acid phosphatase activities than bulk soils. The highest invertase, urease, and acid phosphatase activities were observed in rhizosphere samples of N. longibracteata + S. superba. Protease was highest in the N. longibracteata + R. simiarum rhizosphere, while cellulase was highest in the pure N. longibracteata forest rhizosphere. All samples exhibited obvious rhizosphere effects on enzyme activities with a significant linear correlation between acid phosphatase and cellulase activities (p 〈 0.05) in rhizosphere soils and between protease and acid phosphatase activities (p 〈 0.05) in bulk soils. A principal component analysis, correlating 13 soil chemical properties indices relevant to enzyme activities, showed that protease, invertase, acid phosphatase, total N, and cellulase were the most important variables impacting rhizosphere soil quality. 展开更多
关键词 Bulk soil Enzyme activities Rhizosphere soil Tianbaoyan national nature reserve Nothotsuga longibracteata
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Freeze-thaw processes of active-layer soils in the Nanweng'he River National Natural Reserve in the Da Xing'anling Mountains,northern Northeast China 被引量:2
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作者 RuiXia He HuiJun Jin +2 位作者 XiaoLi Chang YongPing Wang LiZhong Wang 《Research in Cold and Arid Regions》 CSCD 2018年第2期104-113,共10页
The active-layer soils overlying the permafrost are the most thermodynamically active zone of rock or soil and play important roles in the earth-atmosphere energy system. The processes of thawing and freezing and thei... The active-layer soils overlying the permafrost are the most thermodynamically active zone of rock or soil and play important roles in the earth-atmosphere energy system. The processes of thawing and freezing and their associated complex hydrothermal coupling can significantly affect variation in mean annual temperatures and the formation of ground ice in permafrost regions. Using soil-temperature and-moisture data obtained from the active layer between September 2011 and October 2014 in the permafrost region of the Nanweng'he River in the Da Xing'anling Mountains, the freeze-thaw characteristics of the permafrost were studied. Based on analysis of ground-temperature variation and hydrothermal transport characteristics, the thawing and freezing processes of the active layer were divided into three stages:(1) autumn-winter freezing,(2) winter freeze-up, and(3) spring-summer thawing. Variations in the soil temperature and moisture were analyzed during each stage of the freeze-thaw process, and the effects of the soil moisture and ground vegetation on the freeze-thaw are discussed in this paper. The study's results show that thawing in the active layer was unidirectional, while the ground freezing was bidirectional(upward from the bottom of the active layer and downward from the ground surface).During the annual freeze-thaw cycle, the migration of soil moisture had different characteristics at different stages. In general, during a freezing-thawing cycle, the soil-water molecules migrate downward, i.e., soil moisture transports from the entire active layer to the upper limit of the permafrost. In the meantime, freeze-thaw in the active layer can be significantly affected by the soil-moisture content and vegetation. 展开更多
关键词 Nanweng'he RIVER national NATURAL reserve ACTIVE LAYER freeze-thawing processes moisture content vegetation effect
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Community attitudes toward ecotourism development and environmental conservation in nature reserve:a case of Fujian Wuyishan National Nature Reserve,China 被引量:3
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作者 CHEN Bi-xia QIU Zhen-mian 《Journal of Mountain Science》 SCIE CSCD 2017年第7期1405-1418,共14页
Using social exchange theory, this study investigated residents' attitudes toward the preliminary stage of tourism development in nature reserves in Wuyishan National Nature Reserve of China, and the socio-economic a... Using social exchange theory, this study investigated residents' attitudes toward the preliminary stage of tourism development in nature reserves in Wuyishan National Nature Reserve of China, and the socio-economic and negative effects of residents' attitude toward the tourist industry. Results of the questionnaire survey indicated that local people perceived they could benefit from the economic activities related to tourism, and were supportive of the conservation of natural resources and local culture, sustainable community development, and community participation in ecotourism planning and management. This study also revealed that the variables of age, gender, education level, household income, family size, non-farm work arrangements, and the distance to tourism attractions, have significant association with respondents' attitudes toward ecotourism development, or negative impacts of the tourist industry. Respondents who are male, or have a higher household income, are more supportive of tourism development inside the reserve. Younger and more highly educated community members are more likely to support learning more about natural and cultural resources and landscapes. Respondents who have a hieher household income, or live far fromthe village center, are more concerned about the negative environmental impacts of tourism development. 展开更多
关键词 Economic benefits Environmentalconservation nature reserve Residents' attitude Tourism development Wuyishan national naturereserve
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Anthropogenic Effect on Deposition Dynamics of Lake Sediments Based on ^(137)Cs and ^(210)Pb_(ex) Techniques in Jiuzhaigou National Nature Reserve,China 被引量:3
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作者 LIANG Kangkang HU Xinxin +2 位作者 LI Shiguang HUANG Chengmin TANG Ya 《Chinese Geographical Science》 SCIE CSCD 2014年第2期180-190,共11页
Radionuclide dating techniques characterized by137Cs and210Pbex have recently been applied in the study of lake sediments around the world.In this study,a chronological series of sediment cores was established based o... Radionuclide dating techniques characterized by137Cs and210Pbex have recently been applied in the study of lake sediments around the world.In this study,a chronological series of sediment cores was established based on137Cs and210Pbex analyses along with the evaluation of sediment properties,such as particle size distribution,total organic carbon(TOC),carbonate content,and acid-insoluble residue,to study sediment accumulation rates,sediment sources,and responses to human activities in the Jiuzhaigou National Nature Reserve in southwestern China.In terms of the particle size distribution of sediments,silt content was the highest,and clay and sand contents were relatively low.The sediments displayed high TOC contents because of the significant amounts of vegetation grown in the lakes.The carbonate content was also high due to the overall geological background of carbonates in Jiuzhaigou.Carbonate content tended to decline from top to bottom in the sediment cores,whereas the acid-insoluble residue tended to increase.These results suggested that the depth variation of the environmental parameters of the sediments in two lakes in Jiuzhaigou would correspond to each other.The results indicated that the sediment rate of Jiuzhaigou was generally high with strong siltation,indicating that serious soil loss was induced by intensive human activities in the basin over the past decades.The increases in the mass accumulation rate,contents of acid-insoluble residue,and mean particle size during the periods of 1840–1900s,late 1930s–early 1950s,1966–1978,and2003–2006 revealed the occurrence of severe soil and water loss as a result of extensive agricultural expansion,large-scale deforestation,and road construction in Jiuzhaigou.The deposition rate and the properties of lacustrine sediments could reflect the significant impact of human activities on lake sedimentation during Jiuzhaigou′s history. 展开更多
关键词 lake sediment 137Cs 210Pbex deposition rate particle size distribution acid-insoluble residue Jiuzhaigou national nature reserve
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Stability of Land-use/Land-cover in National Nature Reserves of Jilin Province, China 被引量:2
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作者 SHANG Yi WANG Dongyan +1 位作者 LIU Shuhan LI Hong 《Chinese Geographical Science》 SCIE CSCD 2022年第2期324-339,共16页
National nature reserves are an important part of classification management on ecological protection in China. Taking the national nature reserves of Jilin Province as examples, this paper introduced the stability ind... National nature reserves are an important part of classification management on ecological protection in China. Taking the national nature reserves of Jilin Province as examples, this paper introduced the stability index by referring to the intensity model of landuse and land-cover change(LUCC), and analyzed the overall stability of land-use and land-cover(LULC) in the study area from the time interval level and land category level. The stability of LULC in different types of nature reserves was tracked and identified by extracting land-use change trajectory, and the land-use change trajectory was divided into three types: stable type, sub-stable type and unstable type. The impact of LUCC on regional ecosystem services was studied by using hotspot analysis and gravity center analysis. The results showed that: 1) The LULC in the study area was stable on the whole, and the proportion of stable land area reached 86.08%. The intensity of LUCC showed an increasing trend in recent 20 years, and the conversion of cultivated land and construction land was active in continuous time interval. 2) The stability of LULC in forest ecological reserves and wildlife reserves in the eastern part of Jilin Province was the highest, while that in inland wetland reserves and geological relic reserves in the central and western part of Jilin Province was lower.3) The LUCC in national nature reserves not only changed the value of its own ecosystem service function, but also affected the ecosystem service function of the whole region. The combination of intensity analysis and land-use change trajectory was used to identify the characteristics of stability of LULC in nature reserves, which was conducive to deeply understand the process of LUCC in national nature reserves and provided reasonable suggestions for regional ecological protection. 展开更多
关键词 national nature reserves land-use and land-cover change(LUCC) STABILITY intensity analysis land-use change trajectory ecosystem service value
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Winter habitat use of snow leopards in Tomur National Nature Reserve of Xinjiang,Northwest China 被引量:1
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作者 Feng XU Ming MA +4 位作者 WeiKang YANG David BLANK YiQun WU Thomas MCCARTHY Bariusha MUNKHTSOG 《Journal of Arid Land》 SCIE 2012年第2期191-195,共5页
Snow leopards are one of the least known large cats, the population of which has dramatically de- creased. Their habitat loss was considered the main reason for the decline during the last decade, but their habitat pr... Snow leopards are one of the least known large cats, the population of which has dramatically de- creased. Their habitat loss was considered the main reason for the decline during the last decade, but their habitat preferences are still not well known. In this paper, we studied the winter habitat preferences of snow leopards in the Tomur National Nature Reserve (TNNR) in Northwest China during 2004-2005. We used sign surveys and tran- sects to study the winter habitat selection of snow leopards. The results indicated that snow leopards showed a preference for habitat variabilities in slope aspect, vegetation cover, dominant topographical features, landform ruggedness and grazing status. We found that prey availability and dominant topographical features were the most important factors that determined the winter habitat selection of snow leopards. Our results supported the idea that the habitat preferences of snow leopards are a tradeoff between suitable habitat features and avoidance of potential human interactions. 展开更多
关键词 snow leopard Panthera uncia sign survey habitat preferences Tomur national nature reserve
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Sharing and evaluation of a new community co-management model for protecting Crested Ibis:a case study of Crested Ibis National Nature Reserve,China 被引量:5
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作者 WANG Chang-hai WEN Ya-li +2 位作者 LIU Xiao-hai KANG Kai-li LI Bing 《Ecological Economy》 2010年第4期376-386,共11页
The Crested Ibis(Nipponia Nippon) is endemic to Qinling Mountains of China and was once abundant over vast areas of north-east of Asia habitat.During the 20th century,however,the population declined greatly in numbers... The Crested Ibis(Nipponia Nippon) is endemic to Qinling Mountains of China and was once abundant over vast areas of north-east of Asia habitat.During the 20th century,however,the population declined greatly in numbers.Habitat quality used to be the main threat to this species but recent actions by the government and wildlife protection organizations have brought this under control.With the establishment of Crested Ibis Nature Reserve in China,conflicts between socio-economic development and Crested Ibis conservation have become more acute.How do we deal with the relation between Crested Ibis conservation and community development? In this study,the Crested Ibis Nature Reserve co-management model namely "companies + farmers + Nature Reserve" model is proposed and evaluated with demonstration investigation methods,including continuous six-year fixed-site socio-economic development data of surrounding community,company sales revenue data and monitored data of Crested Ibis Nature Reserve.The results show that farmers' income and conservation awareness increased greatly from 2003 to 2008;company sales revenue has increased by about 20% annually in the recent years;management level has noticeably improved in Nature Reserve,the scope of Crested Ibis habitat has expanded 50 hm2;chemical composition of habitat reduced year after year;and the number of Crested Ibis had been growing annually.At the end,the success of the model is evaluated,and problems in implementation of the model are discussed from the following aspects:management system,co-management concept,economic base of partners,marketing mechanism,technical capacity and so on. 展开更多
关键词 SHARING EVALUATION Community co-management Crested Ibis Crested Ibis national nature reserve MODEL Marketing mechanism
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