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采用对比法对采自辽宁省主要地区 1 8对不同肥力典型棕壤中不同粒级微团聚体内全磷的分布以及对磷素的保持与供应状况进行研究 ,结果表明 ,高肥土壤全磷平均含量为 0 .61 1± 0 .1 83g/kg ,低肥的为 0 .379± 0 .0 95 g/kg ;高肥土壤平均吸附磷量为 1 2 7.1± 37.1 7g/kg ,低肥的为 2 33.2± 4 7.2 8g/kg;解吸磷和解吸率高肥的为 2 6.8± 1 0 .77g/kg和 31 .65± 2 5 .66% ,低肥的为 2 1 .3± 8.98g/kg ,和 9.62± 4 .99% .高肥土壤中各粒级微团聚体的全磷含量、磷素的解吸及其解吸率都高于低肥的对应值 ,其中 ,1 0～ 5 0 μm微团聚体中磷素储量最大 ,<1 0 μm微团聚体在磷素的吸附和保持方面贡献最大 ,因此可以把它们作为棕壤的特征微团聚体 .
Using comparative method, the distribution of total phosphorus and the maintenance and supply of phosphorus in different size fractions of micro-aggregates collected from 18 typical brown loci in different fertility areas in Liaoning province were studied. The results showed that the average phosphorus The content of phosphorus was 0. 61 1 ± 0. 83g / kg, and that of low-fat was 0 .379 ± 0. 0 95 g / kg. The average phosphorus uptake of high-fat soil was 12.1 ± 37.1 7g / kg, 2 33.2 ± 4 7.2 8g / kg; desorption phosphorus and desorption rate of high-fat 2 6.8 ± 1 0 .77g / kg and 31 .65 ± 25.66%, low-fat for 2 1 .3 ± 8.98g / kg and 9.62 ± 4.99%, respectively.The total phosphorus content, desorption and desorption rate of phosphorus in all fractions were higher than those in low-fat soil, among which 10 ~ 50 The micro-aggregates have the largest amount of phosphate reserves, and <10 μm micro-aggregates contribute the most to the adsorption and retention of phosphorus, so they can be used as the characteristic micro-aggregates of brown soil.