Research on characteristics of extreme weather disasters and fluctuations trend on Lancang river basin Applicability of established drought index in Huang-Huai-Hai region based on actual evapotranspiration. Comprehensive research on the state of agricultural drought in five main grain producing areas in China Advance in the study on drought index Evaluations of Drought Resistance among Different Sorghum bicolor×S.sudanense Varieties Correlation analysis on |normalized difference vegetation index (NDVI) of different |vegetations and climatic factors in Southwest China. Analysis on characteristics of a typical drought event in Jiangsu Province Low-frequency drought variability based on SPEI in association with climate indices in Beijing Characteristics of Lightning Fire in Daxing‘anling Forest Region from 1972 to 2005 and Its Relationships with Drought Index