三江源区植被NDVI对区域气候的时滞效应分析

Time-Lag Effect of Vegetation NDVI on Regional Climate in "Three River Source" Region

以三江源区为研究区，主要利用一元线性趋势法和简单相关分析法分析了源区1982～2004年生长季累积NDVI的时间序列变化特征及其与气温、降雨、光照时间、风速、地表温度这些气候因子之间的相关性，从月尺度上研究了三江源区植被NDVI对气候因子响应的滞后性特征。最后表明，生长季累积NDVI对气温的滞后期为1个月，对风速的滞后期为2个月，对地表温度的滞后期为4个月，而对降雨量和日照时数不存在滞后响应或者滞后期小于1个月。

A linear trend method was performed to examine the overall temporal trend of NDVI from 1982 to 2004 in growing season of the“Three River Source” region.The correlation between climate factors （air temperature, precipitation, sunshine duration, wind speed and land surface temperature ） and NDVI were investigated by simple correlation analysis .On that basis , the time-lag effect of NDVI on climate factors was researched in month scale .Result shows that the time -lag periods of growing season NDVI response to air temperature, wind speed and land surface temperature respectively were one month , two months, four months.However, there was less than one month or even no time -lag period with precipitation and sunshine duration .