气候条件对稻米品质性状的影响

通过对杂交中粳 80优 12 1的分期播种试验 ,分析了其稻米品质性状在不同播期气候条件下的主成分值 ,并利用偏相关分析法对水稻灌浆结实期间若干气候因子的相对重要性进行综合评价。结果表明 :第 1主成分的特征根λ1 =6.773 ,贡献率为75 .2 60 % ,为透明度因子 ;第 2主成分特征根λ2 =1.2 0 4,贡献率为 13 .3 77% ,为垩白度因子 ;第 3主成分特征根λ3=0 .741,贡献率为8.2 2 9% ,为直链淀粉含量因子。在影响稻米品质的气候因子中 ,水稻灌浆结实期间的日均温度作用最大 ,日均光照数、日均相对湿度次之 ,日均降雨量、日均温差作用最小 ;并据此提出改良 80优 12 1稻米品质的相应策略。

Effect of Climatic Factors on Rice Grain Quality

Based on the experiment in 8 sowing-date of hybrid Japoncia rice 80 you 121, the principal components of rice grain quality traits among different sowing-date was analyzed and also the relative important 5 climate factors upon the quality traits were analyzed by the partial correlation analysis. In the principal component of rice grain quality, first principal component was Transparency(TRP) factor which cigenvalue(λ 1) was 6.773. Cumulative percent was 75.260%; second was Chalkiness degree (CHD) factor which eigenvalue (λ 2) was 1.204. Cumulative was 13.377%; third was Amylose content(AC) factor which eigenvalue (λ 3) was 0.741. Cumulative was 8.229%. The mean daily air temperature was the most important factor considering its effect upon rice grain quality. The second was daily mean light hour, daily mean relative humidity, but daily mean rainfall and daily mean temperature different was less important to the variation of rice grain quality traits.