Spatial-temporal Distribution Characteristics and Risk Analysis of Wheat Dry Hot Wind in Henan Province Based on GIS
Using daily meteorological data from 1980 to 2014 in later growth stage of winter wheat at 121 stations in Henan province,we analyzed the variation trends and spatial-temporal distribution characteristics of winter wheat dry hot wind in Henan.The results show that:the dry hot wind throughout Henan province showed a trend of decreasing,the decline rate of light dry hot wind days was 1.6 d/a,and the decline rate of heavy dry hot wind days was 0.1 d/a.The light dry hot wind annual average occurrence days was 0.3 d/a,the probability of occurrence was 2 cases in 10 years,the heavy dry hot wind average occurrence days was 0.1 d/a,the probability of occurrence was 1 case in 10 years.The occurrence days and probability of dry hot wind in Henan province showed'northern,central and eastern more,western and southern less' pattern.Dry hot wind days showed large interdecadal differences,occurred frequently in 1980s,then 1990s and 2000s.Based on occurrence days,probability,regionalization index and other indicators of dry hot wind,the evaluation model was established to analyze and evaluate the risk distribution of dry hot wind in the whole province,and the assessment results were regionalized and drew by ArcGIS.High-risk zones were mainly distributed in parts of northern,central and eastern Henan.The risk index were the highest in Yiyang county,and relatively higher in Yiyang,Mengjin,Xuchang,Xiuwu,Wenxian,Hebi,Xunxian,Yuanyang,Gongyi,Shangcai,Wuyang and Xiangcheng.The western mountains Sanmenxia,Luoyang and southern abundant rainfall areas Nanyang and Xinyang were the lowrisk areas.
dry hot windGISspatial-temporal distributionriskevaluation
NETL
NSTL
万方数据
维普
