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以长江中上游几种常见的水土保持林为对象，就植物根系对土壤水稳性团聚体数量的影响进行了初步研究。结果表明：林木根系通过径级≤１ｍｍ须根的作用，可以提高土壤水稳性团聚体数量，其原因在于死根提供有机质，活根提供分泌物，作为土粒团聚的胶结剂，配合须根的穿插和缠结，促进土粒团聚，使土壤中直径＞３ｍｍ的大粒级水稳性团聚体增加，从而增强土壤抗分散、悬浮的能力。并建立了林木根系与土壤水稳性团聚体数量增加值的回归模型
Taking the common soil and water conservation forests in the middle and upper reaches of the Yangtze River as an example, the effects of plant roots on the quantity of soil water-stable aggregates were studied. The results showed that the root system of forest tree could increase the amount of soil water-stable aggregates by the function of fibrous roots with the diameter of less than or equal to 1 mm because the dead roots provided organic matter and the living roots provided the secretions. And entanglement, and promote the agglomeration of soil particles, so that the diameter of the soil> 3mm large particle size water-stable aggregates increase, thereby enhancing the soil anti-dispersion and suspension capacity. A regression model was established for increasing the amount of water-stable aggregates in forest roots and soil