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以棕壤为例研究了15对不同肥力水平的典型棕壤、棕壤型水稻土的特征微团聚体（＜10m和＞10m）的组成比例，结果表明该比例即微团聚体（＜10m）／微团聚体（＞10m）可成为土壤肥力水平的一个综合指标。以该指标为标准的典型棕壤和棕壤型水稻土肥、瘦地区分界数分别为0.25和0.35，小于此二值分别为各自肥地，反之亦反。土壤培肥措施可使肥、瘦地特征微团聚体的比例降低并提高土壤肥力水平或根本改变瘦地肥力实质。
Taking brown soil as an example, the compositional ratios of characteristic microaggregates (<10m and> 10m) in 15 brown soil and brown soil-type paddy soils with different fertility levels were studied. The results showed that the proportion of microaggregates (<10m) / Microaggregates (> 10 m) can be a comprehensive indicator of soil fertility. The typical brown soil and brown soil type paddy soil with this index as the standard demarcation number of thin and fat area is 0.25 and 0.35, respectively, less than these two values are respectively the respective fertilizers, and vice versa. Soil fertilization measures can reduce the proportion of fertilizing and lean to characteristic microaggregates and increase soil fertility levels or fundamentally change the essence of soil fertility.