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《Acta Prataculturae Sinica》 2007-04
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Evaluation of grassland ecosystem services in Xilin River basin

PENG Hao1,2,LI Zhen-qing1(1.Laboratory of Quantitative Vegetation Ecology,Institute of Botany,the Chinese Academy of Science,Beijing 100093,China;2.Graduate School of Chinese Academy of Sciences,Beijing 100093,China)  
Ecosystem service is one of the hotspots of ecology,natural resources science and economics.Grassland ecosystems are the second largest vegetation stratum,smaller only than the forest ecosystem.In China,the grassland ecosystem is the biggest terrestrial ecosystem,and the usable area of grassland resources reaches over 3.9×108 hm2.Therefore,it plays a crucial role in maintaining structures,functions and ecological processes of natural ecosystems.As one ecological protective barrier in North China,the Xilin River basin grassland has a pivotal location and unique habitat condition.Therefore,it is very important to evaluate its ecosystem services.This paper appraises the value of grassland ecosystem services in the Xilin River basin,using the methodology of Constanza.We divided the Xilin River basin natural grassland into 5 grades on the basis of biomass and the hierarchical standard of degraded grassland,and then calculated the total economic evaluation of grassland ecosystem services in the Xilin River basin through summing the service value in unit area of grassland of each ecosystem type.Results showed that the total value of the annual grassland ecosystem services was about 76.154×108 yuan.For the integrated effects of productivity and grazing density,the contribution ratio of ecosystem services per hectare of different grassland at 5 health levels differed greatly.From the 1st grade to the 5th grade,the contribution ratio was reduced.The contribution ratio of the 1st grade reached 38.1%,but it reduced to 4.8% for the 5th grade of grassland.Furthermore,the values of the grassland ecosystem services in the XiLin River basin were different at three spatial scales: international,domestic and Xilinhaote local scale.At these three spatial scales,the total values were 88.199×108,76.154×108 and 14.236×108 yuan/a,respectively.For example,for gas regulation,at these three spatial scales,the contribution ratio was 3.7%,11.0% and 7.9% respectively.This finding indicated that the value of ecosystem services was closely related to spatial scale.
【Fund】: 中国科学院知识创新工程项目(KSCX2-SW-107)资助
【CateGory Index】: S812
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