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为探讨套作复光后大豆补偿生长能力的评价方法,比较不同大豆品系补偿生长能力差异,本研究以136个大豆品系为材料,在田间设置2个处理,即不遮荫和遮荫+光照恢复。于取消遮阳网当日和取消后30d共测定了14项形态指标,成熟期调查每个大豆品种(系)的单株产量。根据遮荫+光照恢复处理和不遮荫处理计算各品种各单项指标的补偿系数,采用主成分分析、隶属函数法、聚类分析和逐步回归分析方法,对大豆的补偿生长能力进行综合评价。结果表明,主成分分析将14个单项指标转换为4个相互独立的综合指标;通过隶属函数计算补偿能力综合得分(D值),并对其进行聚类分析,将136份大豆品种按照补偿生长能力强弱分为5大类群,其中第Ⅵ类群(10个材料)补偿生长能力较强,产量较高。通过逐步回归建立套作大豆补偿生长能力评价数学模型,D=-1.314+1.110 X_4+0.623 X_7+0.831 X_1+0.642 X_9,R~2=0.990,并筛选出光照恢复后地上部总干重、叶面积、SPAD、中间节粗作为套作大豆补偿生长能力的主要鉴定指标。
In order to explore the method of evaluating the compensatory growth ability of soybean after photoperiod, the difference of compensatory growth ability of different soybean lines was compared. In this study, 136 soybean lines were used as materials to set up two treatments in the field, that is, no shade and shade + light restore. A total of 14 morphological indexes were measured on the day of cancellation of the shading net and 30 days after the abolition, and the yield per plant of each soybean variety (line) was surveyed at maturity. According to the shading + light restoration treatment and the non-shading treatment, the compensation coefficient of each single species index was calculated. The principal component analysis, membership function method, cluster analysis and stepwise regression analysis were used to evaluate the compensation growth ability of soybean. The results showed that the principal component analysis (PCA) transformed 14 individual indicators into four mutually independent comprehensive indicators. The composite score (D value) of compensation ability was calculated by membership function, and the cluster analysis was conducted. 136 soybean cultivars were grown according to compensatory growth The ability is divided into five groups, of which the group Ⅵ (10 materials) strong compensatory growth, higher yield. By stepwise regression, the mathematic model for evaluation of compensatory growth ability of soybean was established, D = -1.314 + 1.110 X_4 + 0.623 X_7 + 0.831 X_1 + 0.642 X_9, R ~ 2 = 0.990, and the total shoot dry weight Area, SPAD, middle section thick as the main compensation index of soybean growth compensation.