杂交中籼稻生殖期间气象要素与结实率的相关性分析

摘要

Correlation analysis of the annual seed setting rates of hybrid midseason rice with many meteorological elements Was conducted based on 1992-2004 midseason rice regional trials and meteorological data from weather stations of Jingzhou,Wuhan and Xiangfan cities.The results showed that all of the meteorological elements had different correlations with the rice setting rate,and three most important elements were the total sunshine hours,the average soil temperature and dayight temperature regimes from July to September;the correlation coefficient between the total sunshine hours from July to September and the setting rate was very significant(0.7158);The total sunshine hours from July to September(x_6)had the strongest positive effect on the seuing percentage(Y)(x_6→x_6→y=1.617 3).%以1992-2004年湖北省中稻区域试验及武汉、荆州、襄樊气象站的资料为依据,分析了杂交中籼稻生殖期间各种气象要素与年度间结实率变化的相关性.结果表明,各种气象要素对水稻年度间结实率变化都有不同程度的相关性,其相关程度依次为7-9月份累计日照时数、7-8月份日平均地温和7-9月份日平均昼夜温差;7-9月份累计日照时数与结实率的相关系数为0.715 8,达极显著水平;7-9月份的累计日照时数x_6对结实率y有最大的直接正效应(x_6→x_6→y=1.617 3).