Analysis of impacts of drought on GPP in Yunnan province based on MODIS products

Drought has profound impacts on the balance of regional ecosystem. Recently, Yunnan province in China experiences more and more frequent and severe droughts. It is significant to study the effect of drought on the carbon cycle of Yunnan province. Gross primary productivity (GPP) could intuitively reflect the growth status of vegetation. In this paper, we analyzed the response of GPP to droughts in Yunnan province, and evaluated the impact of meteorological factor on the carbon cycle. The results indicated that droughts could apparently lead to reduction of GPP respectively on annual, seasonal and monthly scale. And for most vegetation types, the GPP showed good correlation with both temperature and precipitation, excepting the evergreen forests. What´s more, croplands were more sensitive to the droughts than other vegetation types, with the highest correlation coefficient to the precipitation and no lag existed.