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对发育在第四纪红土母质上的红壤进行研究。结果表明，０～２０ｃｍ耕层土壤微生物量较温带中性土壤低，一般在Ｃ２００ｍｇ／ｋｇ土以下；微生物Ｃ／Ｎ变化范围为４．１～８．２，平均６．２；微生物Ｃ／Ｐ变化范围为３．６～１８．９，平均１３．１。利用方式明显影响着土壤微生物量，以荒地最低，其次为林地和旱地，最高为菜地和水田。土壤微生物量与有机质以及有效养分之间存在较好的相关性，可以作为土壤肥力的活指标，它直接指示着，有机质矿化程度和有效养分的水平。
Red soils developed in the Quaternary red clay parent material were studied. The results showed that the soil microbial biomass in 0-20 cm topsoil was lower than that in temperate neutral soil, generally below C200 mg / kg soil. The microbial C / N ranged from 4.1 to 8.2 with an average of 6.2. Microbial C / P The range of variation is 3.6 ~ 18.9 with an average of 13.1. Utilization mode obviously affected soil microbial biomass, with the lowest wasteland, followed by woodland and dry land, up to vegetable field and paddy field. There is a good correlation between soil microbial biomass, organic matter and available nutrients, which can be used as a living indicator of soil fertility. It directly indicates the degree of mineralization of organic matter and the level of available nutrients.