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在棕壤中,<10微米,特别是<5微米微团聚体有较高的碳、氮、磷储量,对氮、磷及代换性阳离子的吸附能力较强,并有较强的酶活性,但总的数量较少,不到30%;而>10微米微团聚体的碳、氮、磷储量虽然较低,但对氮、磷及代换性阳离子的解析能力较强,有一定强度的酶活性,总的数量较大,超过70%,其中肥地含有的数量又高于瘦地,因而成为影响棕壤肥力的主要部分。土壤微团聚体具有影响土壤理化生物性质多方面的作用,可能作为评价土壤肥力水平的综合指标。土壤酶活性可能作为评价土壤肥力状况的辅助指标。
In brown soil, <10μm, especially <5μm microaggregates have higher carbon, nitrogen and phosphorus reserves, strong adsorption capacity for nitrogen, phosphorus and substitutional cations, and strong enzymatic activity , But the total number is less than 30%. The carbon, nitrogen and phosphorus reserves of> 10μm microaggregates are relatively low, but they have strong analytical ability for nitrogen, phosphorus and substitutional cations, Of the total enzyme activity, the total number of larger, more than 70%, of which the amount of fertilizer is higher than the lean, and thus become a major part of brown soil fertility. Soil microaggregates play a multifaceted role in influencing the physico-chemical properties of soil and may serve as a comprehensive index for evaluating soil fertility. Soil enzyme activity may serve as a secondary indicator of soil fertility.