Dynamic Study on Agricultural Flood and Drought Disasters in China

Flood covered areas,flood affected areas,drought covered areas and drought affected areas in 31 provinces in China during 2000-2009 were selected as analysis variables.Based on correlation and cluster analysis,agricultural flood and drought disasters in China were studied.The results showed that there was only very smaller correlation between flood areas covered and drought areas covered and between flood areas affected and drought areas affected during 2000-2008,but the correlation coefficients became bigger in 2009.During 2000-2009,the change of flood areas covered in China had a trend which was from big fluctuation toward small fluctuation,but drought covered areas were first small and then large,in an increasing trend.Some suggestions were put forward that the study on the correlation between flood and drought disasters should be enhanced,the supervisory to ecosystem in flood and drought disaster areas should be also strengthened,and the input in irrigation should be increased.