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《Arid Land Geography》 2010-06
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Dynamic change of ecological capital and their response to human activities in the northern slope of Tianshan Mountains

ZHOU Ke-fa1,3,CHEN Xi1,ZHANG Qing2,SUN Li1,YANG You-ling1,3,ZHANG Hai-bo1,CHENG Wan-wen1,LIU Zhao-xia1(1 Xinjiang Institute of Ecology and Geography,CAS,Urumqi 830011,Xinjiang,China;2 Center for Earth Observation and Digital Earth, CAS,Beijing 100191,China;3 The Research Center for Resource and Environment of Xinjiang,Urumqi 830011,Xinjiang,Xinjiang)  
Based on a summary of the theories of ecological capital assessment,a case study on the ecological assets valuation in the Northern Slope of Tianshan Mountains was carried out by using RS,GPS and GIS.In this study,a RS valuation model was used to calculate the total ecological capital and Unit area ecological capital of this area respectively in the year of 1990,1995,2003,2008,and their distribution and changes were primarily analyzed.The results show that the total ecological capital in the Changji Hui Autonomous Prefecture increased by 20.7% from 1990 to 2003,which is a major contribution to the total 24% of all 18 years.Meanwhile,the autonomous prefecture can be divided into 4 ecological areas according to the vegetation zonal distribution so as to quantitatively calculate the ecological capital of different ecosystems,analyze its spatial distribution and changes.The per unit area ecological capital performed a quite difference in the regional distribution:the growth speed in western was greater than eastern,and decreased from south to north,which was consistent with the zonal distribution of vegetation gradients.Cultivated land ecological assets change is mainly affected by human factors,the increase amplitude of forest land and meadow is high,and the change rate of 27% because of the double impact of climate and human activities;Water body is not big,the ecological asset growth rate generally about 11%,because of its smaller size,even if the per unit area value varied greatly,nevertheless it is difficult to be reflected in general,on the other hand,considered the water that have buffer action to precipitation conditions;For the glaciers,bare rock and gravel non-vegetation or very sparse vegetation zones,the ecological assets showed a downward trend from 1990 to 2008,mainly due to the climate change;Finally,the factors were analyzed by comparing the ecological capital to climate change and land type changes.Because of climate change and human activities,the vegetation growth was promoted and showed an increase in Unit area ecological capital.Additionally,some policies implemented by the government,such as the policy of returning farmland to forests or grassland,has protected and promoted the vegetation growth,which performs an increase in ecological capital,but on an another hand,rapid economic development has increased the demand of natural resources and exacerbated its request to ecological environment in a certain extent.
【Fund】: 新疆科技厅高技术研究发展计划:200815116 200733145;; 国家自然科学青年基金项目(40601103)和国家自然科学基金(4087120440871028)共同资助
【CateGory Index】: X171.1
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