摘要
通过对河南省30个站1967～1996年近30年的气象资料统计 ,得到全省干热风发生日数 ,并对其进行了EOF分析。结果发现全省干热风日数场主要呈“南少北多”空间分布型 ,另外还有其它几种空间分布型 ;随时间推移 ,全省干热风发生日数呈减少趋势 ;对时间系数进行功率谱分析 ,发现具有准6年和准3年周期 ;通过相关分析 ,发现第一、第二模态时间系数与全省小麦单产存在显著相关关系。
The number of dry hot wind days have been obtained by analyzing statistical data from 30 meteorological stations in Henan Province during 1967～1996 and the EOF analysis has been conducted.The results showed that the dry hot wind day fields mainly assume the spatial distribution pattern of “less in south and more in north ' and some other distribution patterns.With the elapse of time,a decreasing tendency of the dry hot wind days occurred throughout the province.The quasi six year and quasi three year periods have been found by the power spectrum analysis on time coefficients.The appreciable correlation exists between the first and second model time coefficients and the wheat yield in Henan Province.
出处
《自然资源学报》
CSSCI
CSCD
北大核心
2001年第1期59-64,共6页
Journal of Natural Resources
基金
河南省科委课题!"河南省小麦灌浆期气象灾害及防御措施"资助项目
