Disaster Risk Assessment of Continuous Rain Weather in Winter Wheat Grain-filling Period in Henan Province
Based on the winter wheat growth data from 24 agrometeorological stations in Henan Prov-ince from 1981 to 2020 and the daily meteorological observations from 91 meteorological stations and win-ter wheat yield from 1961 to 2020,the average days,precipitation and sunshine hours of continuous rain process as well as the annual average frequency and the multi-year frequency of continuous rain process during the grain filling period of winter wheat in Henan are counted.The risk intensity index of continu-ous rain is constructed by means of the principle component analysis,and the risk assessment of continu-ous rain during grain-filling stage of winter wheat is carried out from the perspectives of occurrence fre-quency,risk intensity index and yield loss rate.The results show that the continuous rain average days,average sunshine hours and average annual frequency during the winter wheat grain-filling period in Henan all present a zonal distribution in spatial scale.The constructed risk intensity index of continuous rain has higher ability to identify continuous rain disasters.The frequency and risk intensity index of con-tinuous rain disasters both are zonally distributed,higher in the south and lower in the north.In Henan Province,the medium and low risk areas of continuous rain during grain-filling stage of winter wheat ac-count for 90.3％,and the high-risk areas are mainly distributed in the eastern part of Nanyang.
万方数据
维普
