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Characteristic Analysis of Agro-meteorological Disasters and the Impacts on Grain Yield in Guangxi
Pages: 92-96
Year: Issue:  3
Journal: Chinese Countryside Well-off Technology

Keyword:  Agro-meteorological DisasterAgricultural ProductionGray Correlation AnalysisGuangxi Province;
Abstract: Based on the statistic data of drought,flood,wind-hail,low temperature,combining with grain yield data in Guangxi Province from 1981 to 2012,agro-meteorological disasters tendency variation and their impacting on grain yield in Guangxi Province was analyzed by using linear regression analysis, moving average and gray correlation analysis in this paper. The results showed that, in recent 32 years,the disaster-affected area rate change of wind-hail, while flood,drought and low temperature was not obvious, but existed phase characteristics. In 1980's and early 1990's, the disaster-affected area rate of drought was in increasing trend, especially, it t remained more than 20%during 1988-1992, while it was low and gentle changed in the middle and late 1990's,and recent period was in dry phase again. Relatively the disaster-affected area rate of blood and chilling damage and wind-hail was low, particularly chilling damage happened rarely. Since the middle of 1990's the disaster-affected area rate of flood presented to decrease, while wind-hail presented to increase obviously, chilling damage presented fluctuant trend. The impaction of agro-meteorological disasters on average grain yield and early rice yield and late rice yield and corn yield performed as, drought>flood>wind-hail>chilling damage, on single-crop rice as, flood>drought>wind-hail>chilling damage, which revealed drought and flood were major agro-meteorological disasters during grain production in Guangxi province.
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