近10a黄土高原地区NDVI变化及其对水热因子响应分析  

Changes of NDVI and Its Responses to Temperature and Precipitation on Loess Plateau over Last Ten Years

作　　者：陈安安[1] 孙林[1] 胡北[1] 罗隆诚[1] 王俊[1] 

机构地区：[1]西北大学城市与环境学院,陕西西安710127

出　　处：《水土保持通报》2011年第5期215-219,共5页Bulletin of Soil and Water Conservation

基　　金：国家大学生创新性实验计划项目"基于NDVI的黄土高原植被变化及其对气候因子的多尺度响应"(10106927);国家自然科学基金项目"半干旱区社会-生态系统对干旱的适应演化机制"(30500077)

摘　　要：植被变化及其对气候的响应是当前全球变化研究的关键领域之一。基于SPOT-VGT NDVI数据集和黄土高原气象资料,应用最大化合成法和Kriging插值等地理空间分析方法,对黄土高原地区植被变化特征及其对气温和降水的响应过程进行了多时间尺度分析。结果表明,1999—2008年期间黄土高原地区植被覆盖整体呈上升趋势,线性增速为9.9%/10a,NDVI在旬、月和季尺度的变化曲线均呈单峰型,8月份达到最大值,2月为全年的最低值。研究黄土高原地区植被NDVI对气温和降水变化响应的最优尺度为月尺度。黄土高原地区NDVI在旬、月尺度上与温度的相关程度强于降水,而季尺度上与降水的相关程度强于气温。Land cover change and its response to climatic variations is an essential part of researches on global climate change.Based on SPOT normalized difference vegetation index（NDVI）,the land cover changes of the loess plateau during the last ten years were analyzed at multi temporal scales using several geo-statistical methods,as well as the response of NDVI to the precipitation and temperature.The results show that the vegetation cover increased substantially during 1999—2008.All the NDVIs at the scales of 10-day,month and season showed single-peak curves with the maximum in August and the minimum in February.Monthly scale was found the appropriate scale for the study addressing the response of NDVI to precipitation and temperature on the loess plateau.The responses of NDVI to temperature and precipitation varied at different scales on loess plateau.The coefficients of correlations between NDVI with temperature were greater than that with precipitation at 10-day or month scale,while lower at season scale.

关 键 词：NDVI 气温 降水量 相关系数 黄土高原 

分 类 号：Q948[生物学—植物学]