Soil P was mainly distributed in the fine fractions on the acidic soils, however on the calcareous soils in the coarser fractions.
在酸性土壤中P主要分布在较细的粒级中，而在石灰性土壤中则主要分布在较粗粒级中。
Hitherto, domestic researches on AOB are mainly about active sludge, sewage processor and so on, while investigations of AOB community structure in soils especially acidic soils are seldom reported.
目前国内针对氨氧化细菌的研究多集中在活性污泥和污水处理器等方面，鲜少涉及其在土壤特别是酸性土壤中的群落结构分析。
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