【摘要】 研究大豆根系的动态变化有助于探讨大豆根系对土壤环境影响的各个时期和各土层的机制。结果表明：大豆分枝期至开花期根系生长迅速，各处理此时期皆占苗期至鼓粒期总根量的 ６０～７０％。 Ａ、Ａ＇和 Ｂ三处理最大根量在结荚期，只有 Ｂ＇最大根量提前。在结荚期、Ａ处理根重及根长比Ｂ＇分别增长４１％和９１％。大豆结荚期根系在土壤层中的分布： ０～ １０ｃｍ根重比其它层次占绝对优势，其中 Ａ＇较明显。大豆根长在１０～２０ｃｍ土层占优势，但与其他层次的差别小于根重的差别。大豆根重与大豆产量呈正相关，凡使大豆增产的技术都增加其根重。更多还原

【Abstract】 The dynamic changes of soybean roots are studied under conventional cultural conditions, and it is helpful for study about the affect of soybean root on soil conditions of different soil layer and soil environment. The results indicated that soyroot had rapid growth from branching to flowering stage, it occupied about 60-70% of the total root growth of seedling to pod filling stage. The maximum root growth of every treatment was at the podding stage, except that with no fertilizer and no subsoiling(B’ ) treatment. In this stage, the root weight and root length of A increased 41 % and 91 % more than the B’ . The root length growth was prominent in 10-20cm soil layer specially under A’ and B’ treatment. It showed also that the soybean root weight was positively correlated with soybean yield.更多还原