长江上游森林生态系统是长江流域的重要生态屏障。以长江上游为研究区域,采用RS、GIS技术,通过建立“干扰—响应”(D-R)生态系统稳定性评价框架和指标体系,开展大尺度森林生态系统稳定性评价研究,并深入分析其空间分布特征。结果表明:①长江上游森林生态系统稳定性整体处于中等偏差的状态,稳定性一般、较差及极差区占整个森林生态系统面积的50.09%;其中,稳定性极差区占6.63%,较差区占19.29%,一般区占24.17%,良好区占26.29%,较好区占23.62%。②长江上游森林生态系统稳定性表现为西北强东南弱的空间分布特征,稳定性与海拔呈近似正相关关系,稳定性较差的区域主要分布在10°-25°坡度区间,25°以上坡度区域稳定性较好。本研究可为长江上游森林生态系统的保护与恢复提供科学依据,进而为长江上游生态环境保护和生态屏障建设提供决策参考。

The forest ecosystem in the upper Yangtze River basin is a significant ecological shelter belt.Taking the upper Yangtze River as a study area,this paper adopted RS and GIS techniques to evaluate the stability of forest ecosystem in a large scale and made a deep analysis of its spatial distribution characteristics by establishing"disturbance-response"(D-R) framework and index system of stability evaluation of forest ecosystem.The results showed that:(1)The stability of forest ecosystem of study area was overall below the average.The mild stable,unstable and very unstable regions accounted for 50.09% of the whole area,of which 6.63% was very unstable,19.29% was unstable,24.17% was mild stable,26.29%was moderate stable,and 23.62% was stable.(2)Its spatial distribution pattern showed that the forest ecosystem stability was better in northwest region while worse in southeast,and there was a positive correlation between the stability and the altitude.Areas of poor stability were mainly distributed on the slopes of 10°-25°,and areas distributed on the slope over 25°were in better stability.The research could provide not only a scientific basis for the conservation and restoration of forest ecosystem in the upper Yangtze River,but also important policy-making reference for eco-environment protection and ecological barrier construction in the study area.