SCIENTIA GEOGRAPHICA SINICA ›› 2005, Vol. 25 ›› Issue (4): 484-489.doi: 10.13249/j.cnki.sgs.2005.04.484

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Evaluation on Degraded Ecosystem in Jinshajiang Xerothermic Valley Using RS and GIS—A Case Study of Yuanmou County in Yunnan

DI Bao-Feng1,2, YANG Zhong1, AI Nan-Shan3, ZHANG Jian-Ping4   

  1. 1. Institute of Mountain Hazards & Environment, Chinese Academy of Sciences, Chengdu, Sichuan 610041;
    2. Graduate School of the Chiness Academy of Sciences, Beijing 100069;
    3. Department of Architecture & Environment, Sichuan University, Chengdu, Sichuan 610065;
    4. Tibet Bureau of Land & Resources, Lhasa, Xizang 850000
  • Received:2004-06-23 Revised:2004-11-02 Online:2005-07-20 Published:2005-07-20

Abstract: Taking Yuanmou County of Yunnan Province as the case, an evaluation on the degraded ecosystem is carried out in Jinshajiang Xerothermic Valley. Based on seven appraisal factors-vegetation index, average patch dimensionality, density of gullies, slop, water-heat belt, livestock carrying and population density, this thesis carries on a comprehensive quantitative evaluation by creating RS and GIS database. The conclusion indicates that there has been a serious ecological degradation in Yuanmou Xerothermic Valley. Compared with the different vertical distribution, the mountain region around the flatland has the most grievous ecological degradation. On the other hand, the non-irrigated farmland, forestland and grassland degrade more seriously among all types of landscape utilization. On the illustration of degraded ecosystem evaluation, the main reasons of ecosystem degradation and rehabilitation methods of degraded ecosystem have been taken under full consideration in this thesis.

CLC Number: 

  • TP311.132/X24