控制排水条件下水稻产量影响指标敏感性的通径分析

以水稻扬粳4038为试验材料,测定了控制排水条件下水稻株高、叶面积指数、根冠比、穗粒数、千粒质量、结实率、穗长、有效穗数和产量,采用相关分析和通径分析方法,计算了对产量的相关系数、通径系数、决定系数和对回归方程估测可靠程度R2的总贡献,建立了测量指标对产量的回归方程。结果表明,穗粒数、千粒质量、结实率和有效穗数的通径系数达到极显著水平(P0.01),是影响水稻产量的重要指标,决定系数分析结果与通径分析结果有一致的变化趋势;自变量指标的减少对产量通径分析的影响发现,在考虑控制排水下水稻产量最优的目标时,要注意穗粒数、有效穗数、结实率和千粒质量的变化。

Path Analysis on Sensibility of Rice Yield Impact Indicators under Controlled Drainage

Taking Yangjing 4038 rice as experimental material,nine traits of the rice under controlled drainage were measured,such as plant height,leaf areal index(LAI),ratio of root to shoot,grains per spike,1000-grain weight,seed setting rate,spike length,number of productive spike and yield.With correlation analysis and path analysis methods,the yield of independent variables on the yield of the correlation coefficient,path coefficient,the coefficient of determination and the overall contribution of R2 the reliability of the regression equation estimation were calculated.The results indicated that the path coefficients of grains per spike,1000-grain weight,seed setting rate and number of productive spike reached a very significant level(P<0.01) and these were the main affecting rice yield indicators,the results of the correlation analysis and path analysis had a consistent trend.The path analysis on the influence of the decrease of amount of independent variables on yield showed that the attention must be paid to the variation of grains per spike,number of productive spike,seed setting rate and 1000-grain weight while considering optimal target of rice yield under controlled drainage.