中文摘要：

基于我国环境小卫星的多光谱数据，结合野外实测数据，得到疏勒河源区的植被覆盖度图，并结合地形因子和多年冻土数据分析植被覆盖度对地形因子和多年冻土的响应．结果表明：疏勒河源区整体植被覆盖度低，区域内植被覆盖度差异性大、离散程度高，冰川、积雪、裸岩石砾地、裸地等非植被景观是疏勒河源区最主要的景观类型；坡度、坡向是限制植被分布的主要因子，坡度越小，平均植被覆盖度越大，随坡向由无坡向、阴坡、半阴（阳）坡到阳坡平均植被覆盖度不断减少；不同冻土类型区植被覆盖度差异性显著，极稳定型、稳定型、亚稳定型、过渡型、不稳定型、季节型冻土区平均植被覆盖度呈现出先增加后减少的趋势，且亚稳定型冻土区域的植被覆盖度最高．

英文摘要：

This paper retrieved the fractional vegetation cover of alpine grassland in the source re- gion of the Shule River Basin based on Chinese environmental satellite （HJ-1A/1B） images and field data, and analyzed the response of the vegetation cover to topographic factors and types of fro- zen ground. The results showed that the vegetation coverage of this region was low with large spatial heterogeneity and high degree of dispersion. The landscape consisted mainly of non-vegetation sur- face types, eg. ice, snow, the bare rock gravel land and bare land. Slopes and aspects were the main limiting factors of vegetation distribution. The average vegetation coverage decreased with the increase of slope. The average vegetation coverage was the lowest on the sunny slope, and the high- est on the shady slope. There were significant differences of vegetation coverage among different types of frozen ground. The distribution of vegetation coverage presented a reversed ＂U＂ curve trend by extremely stable permafrost, stable permafrost, sub-stable permafrost, transition perma- frost, unstable permafrost and seasonal frost, and the average vegetation coverage was the highest in the sub-stable permafrost.