Based on the monthly Normalized Difference Vegetation Index (NDVI) data that is made by GIMMS workgroup of NASA and the monthly air temperature data from 55 stations in the Qinghai-Tibet Plateau for the period of 1982 to 2001, the change characteristic of spring NDVI and the relationship between the spring NDVI anomaly and the summer air temperature have been studied by using the methods of Empirical Orthogonal Function (EOF), correlation analyse and Singular Value Decomposition (SVD). The results are summarized as follows: (1) Spring vegetation presents obviously increased direction over the Qinghai-Tibet Plateau, especially there are more obvious increase in the north and northwest of the plateau and the vicinity of Xigaz?. The mean and maximum air temperature are increased obviously in the north and northwest of the plateau, and the obvious area of minimum air temperature is located in the mid-east of the plateau. (2) The positive correlation between NDVI and air temperature lags 0 to 3 seasons. (3) The correlative coefficient spatial distribution between spring NDVI and summer mean temperature is consistent with its distribution between spring NDVI and maximal temperature. The obvious region of positive correlation is located in the west and northeast of the plateau. The spatial distribution of positive correlative coefficient between spring NDVI and summer minimal temperature is obvious in the northwest and southeast over the plateau. (4) The plateau summer air temperature has a close connection with the preceding spring NDVI. When spring NDVI is abnormally low (or high) over the plateau, and it is obvious negative (or positive) anomaly in the north and the mid-west of plateau, then the summer mean and maximum air temperature are low (or high) in the whole or great part of the plateau, especially obvious in the west and north of the plateau. The influence of spring NDVI on summer minimum air temperature presents consistent positive correlation in whole area, and the key area is located in the mid-south and southeast of the plateau.
LI Hong-Quan, FAN Guang-Zhou, ZHOU Ding-Wen, HUA Wei, LIU Ya-Qin, LI Xue-Min
. Character of Spring Vegetation Change in the Qinghai-Tibet Plateau and Its Influence on Summer Air Temperature[J]. SCIENTIA GEOGRAPHICA SINICA, 2008
, 28(2)
: 259
-265
.
DOI: 10.13249/j.cnki.sgs.2008.02.259
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