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本文根据作者对黑土和棕壤的多年研究结果，论述了不同粒级的微团聚体在保肥和供肥方面的不同性能。鉴于肥地与复地、小粒级与大位级微团聚体间存在着保肥－供肥性能的明显差异，作者试以１０μｍ为界，划分＜和＞１０μｍ两类“特征微团聚体”，以其比例来界定高、低肥力土壤的微团聚体组成的数值范围和评断土壤肥力水平与培肥效果。结果表明，“特征微团聚体”的组成比例能较好地反映土壤肥力的现有状况及其调控的实际效果，是综合评价土壤肥力的新的有用指标。
Based on the author’s many years of research on black soil and brown soil, this paper discusses the different performance of different size fractions of micro-aggregates in fertilizer and fertilizer. In view of the obvious difference of fertility-fertilizer performance between the fertile land and the complex land, the small-scale and the large-scale microaggregates, the authors try to classify the two kinds of “characteristic microaggregates” In its proportion, the range of microaggregate composition of high and low fertility soils and the assessment of soil fertility and the effect of fertilization are defined. The results showed that the composition ratio of “characteristic microaggregates” could well reflect the current state of soil fertility and the actual effect of its regulation and control, and was a new useful index for comprehensive evaluation of soil fertility.