草业科学2012，Vol.29Issue(5)：671-675,5.
疏勒河上游冻土区高寒草地NDVI分布特征及制约因素分析
Analysis of NDVI distribution and limiting factors of alpine grassland in permafrost area of the upper Shule River
摘要
Abstract
The most direct impacts of global warming on permafrost are ground temperature rising and active layer thickening, which will reduce moisture content of surface soil, and then, influence vegetation of permafrost zone. In this study, we studied distribution and changes of NDVI of the alpine grassland and built relationships between NDVI and land surface temperature （LST） to infer the limiting factors （water and energy） of vegetation growth on the source region of Shule River basin, a semi-arid zone, which locates in the western of Qilian Mountain. The result showed that the distribution of NDVI was in the shape of reversed ＂U＂ from extreme stable permafrost zone to seasonal frost zone. Second, Since 1995, NDVI has increased slightly in extreme stable and stable permafrost zones and the increase were more sig- nificant in sub-stable and transition permafrost zones. However, NDVI has decreased in unstable perma- frost zone and seasonal frost zone. Moreover, limiting factor of vegetation growth was transfered from energy in extreme stable permafrost zone to water in seasonal frost zone.关键词
疏勒河上游/高寒草地/NDVI-LST/制约因素Key words
permafrost degradation/alpine grassland/NDVI-LST/limiting factor分类
农业科技引用本文复制引用
周兆叶,宜树华,叶柏生,任世龙,许民,李乃杰..疏勒河上游冻土区高寒草地NDVI分布特征及制约因素分析[J].草业科学,2012,29(5):671-675,5.基金项目
全球变化研究国家重大科学研究计划项目 （）
中国科学院“百人计划”项目 （）
冰冻圈科学国家重点实验室自主课题 （）
国家自然科学基金 （）
