干旱区地理2011，Vol.34Issue(2)：317-324,8.
天山山区草地变化与气候要素的时滞效应分析
Temporal responses of NDVI to climate factors in Tianshan Mountainous Area
摘要
Abstract
Normalized Difference Vegetation Index (NDVI) is generally recognized as a good indicator of terrestrial vegetation productivity. Understanding climatic influences on NDVI enables prediction of productivity changes under different climatic scenarios. Temporal responses of remotely sensed NDVI to climate variables ( air temperature,precipitatiou, sunshine hours) were examined in Tianshan Mountainous Area. Based on ten-day mean air tempe-rature,precipitation and sunshine hours data, SPOT VGT NDVI data , and the LULC map,taking advantage of lag correlatire analysis and GIS method ,we calculated correlative coefficients between NDVI and air temperature, precipitation and sunshine hours,with climate variables in thirteen different time scale (1 - 13 ten-days) and thirteen different time lags (0 - 12 ten-days). The results show that correlative coefficients between remotely sensed NDVI and concurrent air temperature,precipitation are all significant in the Tianshan mountainous area,but correlative relationship between NDVI and concurrent sunshine hours was not statistically significant with correlative coefficient of 0.099. Response time of ND VI to air temperature, precipitation,sunshine hours separately is twenty days, ten days and seventy days. In the case of air temperature,NDVl is most strongly related to the sum of air temperature over about four ten-day periods. As far as precipitation is concerned, when the lag time reaches ten days period, correlatire coefficient comes up to the most value. NDVI is most slrongly related to the sum of precipitation over four ten-day periods. For sunshine hours,the correlative coefficient between NDVI and over ten ten-day periods (0 -9 ten-day) accumulative sunshine hours is biggest in all combinations of time periods.关键词
NDVI/气温/降水/日照时数/天山山区Key words
NDVI/ air temperature/ precipitation/ sunshine duration/ the Tianshan Mountainous Area分类
信息技术与安全科学引用本文复制引用
王桂钢,周可法,孙莉,李雪梅,秦艳芳..天山山区草地变化与气候要素的时滞效应分析[J].干旱区地理,2011,34(2):317-324,8.基金项目
国家自然科学基金(40871204、40871028) （40871204、40871028）
国家自然科学青年基金项目(40601103)联合资助 （40601103）
