基于RS的吉尔吉斯斯坦中部山区植被覆盖动态变化分析

[目的]研究吉尔吉斯斯坦中部山区植被覆盖动态变化.[方法]利用1975、1994、2001、2004年间的四期Landsat TM/MSS影像,采用基于植被指数的像元二分法计算吉尔吉斯斯坦中部山区的植被覆盖度,并对研究区1975 ～ 2004年植被覆盖的变化情况进行遥感监测和定量分析.[结果]吉尔吉斯斯坦中部山区的植被覆盖度由1975年的79;下降为2004年的70;；植被退化的总面积为1 054 km2;植被覆盖度在50;～100;的退化面积最大,为611 km2.四个时期中1994年植被覆盖较高,面积占研究区面积的比例为81;,2001年植被覆盖为最低,只占研究区面积的比例60;.三个时间阶段中1994～2001年退化最为严重植被,退化的总面积为5 913 km2,占研究区总面积的50.4;.[结论]吉尔吉斯斯坦中部山区的植被退化主要是由于气候变化、自然灾害、人类活动等因素造成的.针对不同的情况,因势利导借助人工干预和自然力进行生态修复,改善吉尔吉斯斯坦中部的生态环境.

Analysis of Vegetation Coverage Dynamic Changes in Kyrgyzstan's Central Mountain Based on RS

[Objective]To study the dynamic change of vegetation coverage in the central mountainous areas of Kyrgyzstan.[Method]The four Landsat TM/MSS images taken in the year 1975,1994,2001 and 2004 were applied.The vegetation coverage in middle Kyrgyzstan mountainous areas was calculated on the basis of the vegetation index of Dimidiate Pixel,and remote sensing monitoring and quantitative analysis were carried out in the research area during the period from 1975 to 2004 to observe the vegetation variations.[Result] The results show that;Kyrgyzstan central mountainous vegetation coverage declined from 79%in 1975 to 70%in 2004;the area of vegetation degradation is 1,054 km2;vegetation degradation in the 50%- 100% coverage area is the largest,that is,611 km.Of the four periods mentioned above,the highest 81%vegetation coverage was observed in 1994 in the study area while the lowest coverage was in 2001,which only accounted for 60%.In the three time phases between 1994 and 2001,degradation is the most serious,and the area of vegetation degradation reached 5,913 km,accounting for 50.4%of the total study area.[Conclu- sion]The vegetation degradation of central mountainous areas of Kyrgyzstan was mainly due to climatic change,human activities,natural disasters,and other factors.In view of the different situations,and in the light of its general trend,artificial intervention and natural force are suggested to be used to restore the ecology in this area,thus improving the ecological environment of central Kyrgyzstan.