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水稻产量变化受多种因素左右,其中气象条件为重要因素,现就这个问题进行一些初步分析,以便为汉中地区水稻生产提供一些气象方面的依据。一、和水稻生产密切的气象条件考察五十年代以来汉中地区天气条件(气象资料系汉中点的,反映了全地区的一般情况,且和水稻产量有较好相关)和水稻产量逐年变化(均指单产与前一年相比的变化)的关系,以夏温(6～8月)、夏季日照(6～8月)和立秋后(8月中～9月初)强冷空气活动的迟早及强度等条件对产量的影响较大。1.夏温问题夏季是各种茬口水稻长分蘖、穗分化、抽穗扬花和水稻的主要灌浆结实时期,
The change of rice yield is affected by many factors, of which the meteorological conditions are important factors. Some preliminary analysis on this issue is now carried out to provide some meteorological evidence for rice production in Hanzhong area. I. Closely Meteorological Conditions with Rice Production The weather conditions in Hanzhong since the 1950s (the meteorological data were plotted at mid-Han, reflecting the general situation in the whole region and closely related to rice yield) and the year-by-year changes in rice production (both Refers to the changes in yields compared with the previous year), the relationship between summer cold (June to August), summer sunshine (June to August) and late autumn (August to early September) strong cold air activity and Strength and other conditions have a greater impact on the yield. 1. summer temperature problem Summer is a variety of stubble rice long tillering, spike differentiation, heading and flowering and paddy rice main filling period,