This article conducts a systematic research on the spatial and temporal characteristics in the source region of three rivers on the Qinghai-Tibet Plateau, using 16-day 250 m NDVI and EVI of MODIS data in 2007. The results indicated that the spatial distribution of the NDVI and the EVI had very obvious regional characteristics, which presented a gradual reducing tendency of the NDVI and EVI values from southeast to northwest in the study area. The regular seasonal variations of vegetation index were very distinct, with the maximum value in August. The variation trends of two kinds of vegetation indices were consistent at different altitudes, which showed that the functions of NDVI and EVI were quite consistent. The difference value between NDVI and EVI gradually increased with the increase of vegetation index value, while EVI was more stable than NDVI as an indicator for vegetation variation. The research on the relationship between vegetation index and meteorological elements showed that the monthly mean temperature, precipitation and the vegetation index presented significant correlation dependence. In the study area, the correlation coefficient value between the current month precipitation and the next month vegetation index was much greater than that between the current month precipitation and the current month vegetation index, indicating that there was a time lag relation between the vegetation index and the precipitation. However, there was no relation between the vegetation index and the monthly average temperature. The effect of the precipitation on the vegetation growth was greater than that of the temperature.
SONG Dong-mei, ZHANG Qian, YANG Xiu-chun, GUO Peng, WEN Shao-yan
. Spatial and temporal characteristics of MODIS vegetation index in the source region of three rivers on Qinghai-Tibet Plateau in China[J]. GEOGRAPHICAL RESEARCH, 2011
, 30(11)
: 2067
-2075
.
DOI: 10.11821/yj2011110013
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