【摘要】 在大豆盛花期和结荚期 ,土壤水稳性团聚体数量达到最大值 ,比苗期增加 30 %。玉米区土壤在同一时期水稳性团聚体也达到最大值 ,比苗期增加 2 3%。但在收获期 ,大豆区水稳性团聚体比苗期增长 16% ,而玉米区却减少 33%。大豆区团聚体 (0 5 - 1mm和 1- 2mm粒径 )对水的稳定性指数比玉米高 17 5 %。从水分能量观点出发 ,易于被作物从中吸收有效水分的 0 0 5 - 0 0 1mm和 0 0 1- 0 0 5mm的孔径孔隙 ,大豆区始终高于玉米区。作物吸收水分较困难的 >0 0 5mm和 <0 0 0 5mm孔径孔隙 ,在大豆生育期中迅速减少 ,至收获期仍低于玉米区更多还原

【Abstract】 The content of soil water stable aggregates reaches the maximum value during soybean blooming and podding stage, which is 31.7% higher than it’s seedling stage. The corn plot also reaches the maximum value at the same stage, which is 22.9% higher than it’s seedling stage. During the soybean havesting stage, the stable aggregates are 15.9% higher than it’s seedling stage and the corn plot decreases by 32.8% .The water stable index(0.5-1mm and 1mm-2mm aggregates) is 17.5% higher than corn plot. From the point of water energy, the water in which maybe easy to be absorbed by root, soybean, plot is higher than corn plot all along.更多还原