Analysis the Impact of Drought on NDVI in Drought Periods Combined with Climate factors and Land Cover in Southwest China
نویسندگان
چکیده
From winter 2009 to spring 2010, due to decreasing precipitation and high temperature, Southwest China experienced the worst meteorological drought in 60 years. The drought has impacted large areas of Guizhou, Yunnan, Guangxi and Sichuan provinces. In this paper, climate data (precipitation and temperature) and SPOT VGT Normalized Difference Vegetation Index (NDVI) data were combined with land cover classification maps to analyze the change and spatial distribution of NDVI during the recent 13-year period of drought in Southwest China. A stepwise multiple regression analysis method and correlation coefficient analysis were used to examine relationships between NDVI and climate data for different land covers. The results revealed that vegetation positively responded to temperature and 70-day total precipitation during the drought period. The croplands of the in Guizhou and Guangxi provinces were seriously affected by climate factors.
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