中文摘要：

研究祁连山地区植被覆盖变化及其与气候因子的响应关系对这一地区土地利用总体特征以及对区域及全球气候和环境变化都将产生深远的意义。利用2000-2012年美国国家航空航天局提供的MODIS NDVI数据并结合相应的气候资料,通过对逐像元信息的提取和分析,运用均值法、斜率分析法、相关分析法,研究了2000-2012年不同季节祁连山植被覆盖的时空变化及其与气候因子的相关性。结果表明：13 a来祁连山植被覆盖整体上呈增加趋势,其中春季植被改善最为明显,秋季次之;植被覆盖变化在不同季节都存在明显的空间差异;不同季节植被与气温、降水的时滞效应不尽相同;祁连山春季大部分地区NDVI与气温呈显著正相关,夏季NDVI与降水呈显著正相关,秋、冬季NDVI与降水、气温的相关性不明显。

英文摘要：

It is of profound significance for the regional land use characteristics as well as regional and global climate and environment change to research the vegetation coverage change and its response to the climatic factors in Qilian Mountains. Based on the NASA data of MODIS NDVI and climatic data from 2000 to 2012,this paper studied the spatio-temporal variation of vegetation coverage changes and its correlation with climatic factors in Qilian Mountains by using the Average Method,Trend Line Analysis Method and Correlation Analysis Method.Results show that： the vegetation coverage showed increase trend as a whole in recent 13 years,and the trend significantly increased in spring,followed by that in autumn;the vegetation coverage changes have obvious spatial differences in different seasons,and the increased area of vegetation in summer is the largest with an area of91 669 km2,accounting for 48.7% of the total area;there is an obvious spatial differences of the time lag effect between vegetation change and temperature,vegetation and precipitation in different seasons;the correlation coefficient between NDVI and temperature in spring is the highest with the correlation coefficient being 0.721;the correlation coefficients between NDVI in summer and its previous and the current cumulative precipitation are the highest,indicating that the NDVI in summer and the precipitation in spring has a certain lag correlation;the correlation between NDVI and precipitation,NDVI and temperature in autumn and winter is not obvious;In spring,the correlation between temperature and NDVI in Daban Mountain,the valley of Datong River and Huangshui River is significant;In summer,the correlation between NDVI and precipitation is the highest and significant in most of the western region;the correlation between NDVI and temperature,precipitation in autumn is relatively low;NDVI in winter has low relativity with temperature and has a significant negative correlation with precipitation.