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采用框架剖面法测定了大豆根系干重在草甸黑土和白浆土中的分布特点。大豆根系干重 85 %分布在水平方向的 0～ 12 .7cm ,获得高产的最适宜株行距为 12 .7× 12 .7cm ;大豆根系干重 85 %分布在垂直方向的 0～ 10cm ,呈现T型分布。根系在草甸黑土中水平分布与白浆土相似 ;但垂直方向的 0～ 10cm土层中 ,草甸黑土的根系干重高于白浆土
The distribution characteristics of soybean root dry weight in meadow black soil and albic soil were determined by the framework section method. 85% of soybean root dry weight distribution in the horizontal direction of 0 ~ 12 .7cm, to obtain high yield optimum strain spacing of 12.7 × 12.7cm; 85% of soybean root dry weight distribution in the vertical direction of 0 ~ 10cm, showing T Type distribution. The horizontal distribution of root in meadow black soil is similar to that of albic soil. However, the root dry weight of meadow black soil is higher in 0 ~ 10cm soil layer in vertical direction than in white soil