Abstract:

Under the background of global warming, meteorological disasters have been increasing and the extreme drought events have frequently taken place, resulting in serious losses to regional grain production. Among the meteorological disasters, floods and droughts are the most directly related to grain production and the relationship between these disasters and the grain yield could provide basis for hazards mitigation and grain supply. According to the statistics of the affected area, inundated area, crop planting area and grain output from 1988 to 2007 in Henan Province, this paper analyzed temporal and spatial distribution of drought-flood hazards and its relationship with region grain output. Results showed that drought-flood hazards has obvious interannual fluctuation and the regional difference, the worst drought was occurred in 1994, frequent zone as Sanmenxia, Luoyang, the most serious flood was occurred in 2003, frequent zone as Zhumadian. The correlations of grain yield per hectare fluctuation coefficient and drought-flood hazards affected coefficient were bigger difference in different time, Luoyang, Sanmenxia and Zhengzhou were influenced by drought, Kaifeng, Shangqiu, Zhumadian were influenced by flood.