河南典型农区冬小麦干热风灾害的遥感图像变化分析

Analysis of Remote Sensing Image Changes of Winter Wheat Dry and Hot Wind Disasters in Typical Rural Areas of Henan Province

为对典型农区冬小麦干热风灾害遥感图像的变化进行分析,以河南地区为例。利用河南地区的气象资料,与小麦发育期以及产量、干热风的灾害数据,利用气象行业的标准冬小麦的干热风的灾害指标,对干热风的危害指数进行计算,对冬小麦对气象产量的影响关键的因子进行确定,对河南典型农区的冬小麦的干热风的变化进行分析,并对干热风发生的次数和冬小麦的单产之间的关系进行探讨。分析的结果表明,近20年来河南地区的冬小麦轻度以及重度的干热风的灾害总体呈现出逐渐减少的趋势,轻度以及重度干热风的年际产生的变化比较大,90年代的干热风灾害较为严重,2000年情况较好。日最高的气温以及相对的湿度与相对的风速等要素起到综合的作用对河南冬小麦的干热风灾害的整体呈现出递减的趋势进行决定,相对风速的减小对干热风的灾害产生减弱起到重要的作用。

In order to analyze the change of remote sensing image of the dry hot wind disaster of the typical agricultural area,take henan province as an example. Using the meteorological data of henan region,and wheat development and production,the dry-hot wind disaster data,the use of meteorological industry standard of winter wheat dry-hot wind disaster index,the harm of dry-hot wind index calculation,to winter wheat meteorological yield key factor to determine the influence of the typical henan agricultural winter wheat dry-hot wind of change is analyzed,and the dry-hot wind occurrence number of times and the relationship between the yield of winter wheat of were discussed. Analysis results show that over the past 20 years in henan area of winter wheat dry-hot wind of mild and severe disasters overall presents the trend of gradually reduce,mild and severe interannual changes of dry-hot wind is bigger,dry-hot wind disaster is more serious in the 90 s,in 2000. Daily highest temperature and relative humidity and the relative wind speed and other factors have the effect of integrated to the whole of winter wheat dry-hot wind disaster of henan presents a decreasing trend for decision,the decrease of the relative wind speed ofdry-hot wind disasters have weakened play an important role.