2000-2010年藏北申扎县植被NDVI时空变化与气候因子的关系  

The Spatial and Temporal Variation of NDVI and Its Relationships to Climatic Factors in Northern Tibet over the Period of 2000—2010——Take Shantsa for Example

作　　者：张晓克[1,2] 鲁旭阳[1] 王小丹[1] 

机构地区：[1]中国科学院水利部成都山地灾害与环境研究所山地表生过程与生态调控重点实验室,四川成都610041 [2]中国科学院大学,北京100049

出　　处：《山地学报》2014年第4期475-480,共6页Mountain Research

基　　金：中国科学院战略性先导科技专项(XDB03030505);中国科学院西部行动计划(KZCX2-XB3-08)~~

摘　　要：为揭示气候变化对申扎植被生态系统的影响,利用2000—2010年间的MODIS NDVI数据和对应的气候资料,研究了申扎县植被NDVI时空变化及其与气候因子的关系。结果表明,近10年来研究区生长季NDVI是减少趋势(p=0.069),其年均减少量和减少率分别为-0.0013和-0.55%/a。NDVI增加区域占申扎县总面积的32.78%,NDVI减少区域占总面积的67.22%。NDVI增加是高海拔的高山植被增加引起的,NDVI减少是高寒草原和高寒草甸的下降共同引起的。高寒草原比高寒草甸变化更敏感;温度升高导致的气候变暖变干可能是申扎县植被生长季NDVI减少的主要原因。To reveal the effects of climate change on vegetation ecosystems, we used atime series （2000--2010） data set of Normalized Difference Vegetation Index （NDVI） together with historical climate data to analyze interan- nual variations of NDVI and explore the relationships between NDVI and climatic factors in Shantsa in this paper. The results showsthat NDVI decreased bya magnitude of -0. 0013 and a ratio of -0.55%/a during the growing season（p = 0. 069） over recent decade. The NDVI increasing area accounts for a total area of 32.78% , while the NDVI decreasing area accounts for a total area of 67.22% in Shantsa. The NDVI increasing areais alpine vegeta- tion, which is distributed inhigh altitude area. The NDVI decreasing areais alpine meadow and alpine steppe, the latter is more sensitive than the former. Increased temperature whichleads todrought climate may be the main reason for NDVI decreasing.

关 键 词：MODIS NDVI 气候因子 相关分析 

分 类 号：Q948[生物学—植物学]