金沙江流域(云南部分)生态潜力及其变化

植被景观要素的生态潜力能够反映某区域内生态功能的综合潜力，研究植被景观要素的生态潜力可望为该区域的生态保护工作提供参考。金沙江流域是我国西部的生态脆弱区，因此选择本流域的云南省部分地区进行植被景观要素的生态潜力与变化研究。首先，对流域内各植被类型进行生态潜力的分级与打分；然后，采用1996与2006年的TM遥感数据，制作了流域内的两期植被分类图，并在此基础上，借助ArcGIS软件绘制了生态潜力图；最后，根据流域内10年期间的植被类型变化面积，计算出流域内生态潜力的变化量。分析得出，流域内生态潜力变化最大的为中、东部地区，而该地区正是人口分布比较集中的地区。研究成果一方面可望加强人们认识流域内植被的生态功能和保护价值，以及植被的发展和破坏趋势；另一方面为流域内植被的恢复方向和重点提供可靠的依据.

ON ECOLOGICAL POTERTIAL POWER AND ITS CHANGE IN JINSHA RIVER WATERSHED(YUNNAN PART)

The ecological potential power of a vegetation pattern reflects the ecological integrated power of one area.Therefore,the study on ecological potential power of the vegetation pattern can offer references for ecological protection.The Jinsha River Watershed is one fragile area in the Chinese western region.The Jinsha River Watershed in Yunnan Province was selected for study of its ecological potential power.First,on the basis of ecological potential power criterion,which was established according to different classes of vegetation,the ecological potential power of different plants was recorded.Second,TM remote sensing data of 2006 and 1996 was used to make vegetation classified plot in the watershed.On the basis of this vegetation classifying plot,the ecological potential power chart was also plotted with ArcGIS software.From the chart,the middle and west region of the study area were showed to be poorer about its ecological potential power.Furthermore,the area change of different vegetation was also calculated during recent 10 years;and ecological potential power change was calculated too.The ecological potential power changed mostly in the middle and west of Jinsha River Watershed in Yunnan Province,and this is consistent with its population distribution,because population is most dense in these areas.As a result of this study,the vegetation ecological function and values,and the trend of vegetation change in the watershed were better illustrated.Moreover,the study result offered evidence for vegetation restoration of Jinsha River Watershed in Yunnan Province.