数字化1960年测绘的祁连山地形图和基于知识规则分析祁连山1990年和2000年Landsat TM、ETM影像,对祁连山自然保护区青海云杉林空间分布及其变化进行分析。结果表明:青海云杉林主要分布在祁连山的东部和中部,即石羊河和黑河流域上游;1960年祁连山青海云杉林面积为1494.60km2,占整个保护区面积的5.456%。1990年青海云杉面积为1336.85km2,2000年青海云杉面积为1375.25km2,呈现先减少后增加的趋势;保护区东、中、西段青海云杉动态变化趋势不同,1960年到1990年东段和中段区域青海云杉面积减少4%,而1990年到2000年中段面积增加,东段和西段青海云杉林分布面积减少;设立保护区对祁连山青海云杉的保护起到了明显的作用,遏制了青海云杉面积的减少并且部分地区分布面积得到扩展。
According to digitalization of topographic maps of Qilian mountain that made in 1960 and extraction information from Landsat TM/Picea crassifolia in Qilian mountain.The results showed that the Picea crassifolia mainly distributes in middle and eastern part of Qilian mountain,the upstream of the Heihe watershed and Shiyang watershed,the area of Picea crassifolia in Qilian mountain was 1494.60km2,in 1960,and 1336.849km2 in 1990,1336.849km2 in 2000.The change trend of Picea crassifolia is different in different part of Qilian mountain.The area of Picea crassifolia decreased by 5% from 1960 to 1990.However,from 1990 to 2000,the area of Picea crassifolia increased in the middle part.Establishment of the protection zone is very helpful for protecting the ecosystem of Picea crassifolia.