大豆种植密度对玉米/大豆间作系统产量形成的竞争效应分析

任媛媛, 张莉, 郁耀闯, 张彦军, 张岁岐

Competitive effect of soybean density on yield formation in maize/soybean intercropping systems

REN Yuan-Yuan, ZHANG Li, YU Yao-Chuang, ZHANG Yan-Jun, ZHANG Sui-Qi

表4 间作玉米产量决定因子的通径分析

Table 4 Path analysis of maize yield in interplanting patterns

自变量 Independent variable 直接通径系数(直接作用) Direct path coefficient (direct action) 间接通径系数(间接作用) Indirect path coefficient (indirect action) 穗重 Ear weight 穗长 Ear length 秃尖长 Barren tip length 行粒数 Ear row number 穗粒重 Grain weight per ear 轴重 Cob weight 千粒重 1000- grain weight 穗重Ear weight -1.71 -0.11 -0.50 0.39 1.43 0.19 0.04 穗长Ear length -0.13 -1.53 -0.41 0.40 1.26 0.17 0.03 秃尖长Barren tip length 0.94 0.91 0.05 -0.26 -0.75 -0.10 -0.02 行粒数Ear row number 0.51 -1.31 -0.10 -0.48 1.11 0.15 0.03 穗粒重Grain weight per ear 2.18 -1.13 -0.07 -0.32 0.26 0.18 0.04 轴重Cob weight 0.24 -1.39 -0.09 -0.41 0.32 1.64 0.04 千粒重1000-grain weight 0.05 -1.27 -0.09 -0.31 0.29 1.58 0.20