THE INFLUENCES OF ONE TYPICAL DROUGHT EVENT ON DIFFERENT VEGETATION IN THE SOUTHEASTERN UNITED STATES

Abstract:

In order to study the impacts of the typical drought disaster on the vegetation, we selected the drought event in the Southeastern United States that occurred from February 2007 to December 2007 based on the standard precipitation evapotranspiration index (SPEI). And then we analyzed the drought influences on the leaf area index (LAI) and the Fraction of Absorbed Photosynthetically Active Radiation (FAPAR) of the Global Land Surface Satellite (GLASS) products. We found that: (1) the area where LAI anomalies and FAPAR anomalies are less than 0 is also the area experienced severe drought. (2) Compared with the croplands, the LAI anomalies and FAPAR anomalies of forests are much smaller, suggesting that the response of different vegetation to the drought is also different. (3) The responses of vegetation to drought disasters usually delay 1-2 months.