【摘要】 本研究采取培养液法和偏光显微镜法研究了大豆对耕层土壤形态的动态影响。结果表明 ,1、以大豆根系代谢培养液处理干筛 1- 2mm团聚体 ,可使其 14%成为水稳性团聚体 ,达到 1%的显著水平。 2、耕层土壤的团聚体品质及其垒结状况的改善是随着大豆生育进程逐渐形成的 ;尢以大豆苗期和开花期的两个代谢高峰为耕层土壤团聚体品质的改善提供的胶结物质最多 ;随着大豆的生长发育 ,其根系的穿插 ,挤压作用为耕层土壤复合性团聚体的形成提供了动力。更多还原

【Abstract】 Metabolic cultural solution method and polarizing microscopic techniques selected for this experiment. The results are as follows:①Exudates and matters in the metabolic cultural solution of soybean root are cementing agent to improve the quality of soil aggregates, which reachs the level of 1% singnificance. ②The dynamic effecf of soybean on micromorphology of tilth soil shows it changes the simple aggregates of corn stubble field to round or ellipse shape and multidegree cmpound aggregates and multidegree pore space withis soybean various growing stages.③The colloid cementing compound aggregates is the abscission substance, secretion and the decayed old roots. The motive force to multistage aggergates is the action of penctration, keeping apart and squeezing by soybean new roots.更多还原