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以北京市松山自然保护区同海拔油松林下两种母质(花岗岩和石灰岩)上发育的土壤为对象,研究了土壤的全氮、有效磷、速效钾含量在剖面的垂直变化.结果表明:花岗岩母质发育的土壤0～20cm土层的全氮、有效磷和速效钾含量分别为1.61～2.35g·kg-1、5.84～10.74mg·kg-1和39.33～93.66mg·kg-1,石灰岩母质发育的土壤分别为1.69～2.36g·kg-1、4.45～8.57mg·kg-1和60.66～124.00mg·kg-1.两种母质发育的土壤0～10cm土层的全氮、有效磷和速效钾含量均最大,且与各土层之间差异均极显著,并随土层深度的增加而下降,说明土壤全氮、有效磷和速效钾含量的分布有很强的表聚性,而且石灰岩母质发育的土壤的表聚性更强.对同土层土壤进行配对t检验,全氮含量在各土层之间无显著性差异,有效磷含量在0～10cm土层差异极显著,速效钾含量在10～20cm土层之间差异显著.
The vertical distribution of total N, available P and available K in the soil profiles of the two parent materials (granite and limestone) under Pinus tabulaeformis forest in Songshan National Nature Reserve in Beijing was studied. The results show that the granite The contents of total nitrogen, available phosphorus and available potassium in 0-20 cm soil layer with parent material development ranged from 1.61 to 2.35 g · kg-1 · 584 · 10.74 mg · kg-1 and 39.33-93.66 mg · kg-1, respectively, The developed soils were 1.69 ~ 2.36g · kg-1, 4.45 ~ 8.57mg · kg-1 and 60.66 ~ 124.00mg · kg-1, respectively.The contents of total nitrogen, available phosphorus The content of available potassium was the largest, and the difference with each soil was extremely significant, and decreased with the increase of soil depth, indicating the distribution of soil total nitrogen, available phosphorus and available potassium had a strong surface aggregation, and The soil aggregates with stronger limestone parental development are stronger.Comparing the soil with paired t-test, the total nitrogen content has no significant difference among all soil layers, the available phosphorus content is extremely significant in 0 ~ 10cm soil layer, Potassium content in 10 ~ 20cm soil layer between the significant difference.