Vulnerability Assessment of Agricultural Drought in Henan Based on Grey Correlation Analysis
To reduce the damage caused by agricultural drought,ten indicators closely related to agricultural drought are selected,and grey correlation analysis method is adopted to evaluate the vulnerability of agricultural drought in Henan Province in 2015,with the worst value and the optimal value as the reference series.The results show that there are slightly difference of the drought vulnerability calculated with two reference series,but the basic trend are consistent,namely,the drought vulnerability in Xinyang,Shangqiu,and Zhumadian in the south-east of Henan are weaker,and the vulnerability are stronger in Jiyuan,Sanmenxia,and Luoyang in west Henan,and Kaifeng in east Henan,while the other cities are in between.The reason is that the rainfall is abundant in southeast Henan,so the farm irrigation could be guaranteed and grain yield is high,which could reduce the drought vulnerability,while in west Henan rainfall is relatively less,as a result,the farmland irrigation and the grain yield are affected,thus the drought vulnerability is high.It is necessary to increase agricultural input to build more water conservancy facilities in west Henan,meanwhile,to promote development of agriculture and water conservancy through science and technology,so as to reduce the risk of agricultural drought in the area.
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