为了加强对人工林的经营、管理,进一步改善生态环境,以黔南马尾松人工林土壤为研究对象,对不同层次土壤水稳性团聚体和土壤养分指标变化进行了分析,并研究了水稳性团聚体及各养分之间的关系.结果表明:不同龄林地土壤,>0.25mm水稳性团聚体含量变化为近熟林地>幼龄林地>中龄林地>成熟林地.不同龄林地不同土壤层次的水稳性团聚体呈现出下降趋势.马尾松林地不同土壤层次全氮、速效氮、全磷、速效磷、速效钾和有机质的含量都随着土层深度增大而呈下降趋势.幼龄林地、中龄林地的土壤>0.25 mm的水稳性团聚体与土壤养分的相关性不显著,而近熟林地、成熟林地的土壤>0.25 mm的水稳性团聚体与土壤养分之间的相关性较显著.%The water-stable aggregate and nutrient index in soils with different depths of Pinus massoniana plantation in Qiannan prefecture and the relation between water-stable aggregate and different nutrients were studied to improve plantation management and biological environment further. The results showed that change of ＞0.25 mm water-stable aggregate content in plantation soils with different age was nearly mature forest land ＞young forest land ＞immature forest land ＞mature forest land, the waterstable aggregate content in different soil layers of forest land with different ages presented a declining trend, total N, rapid available P, rapid available K and organic matter content in different soil layers of Pinus massoniana plantation reduced with the increase of soil depth, there was no significant relation between ＞0.25 mm water-stable aggregate content and soil nutrient in young forest land and immature forest land, and there was a significant relation between ＞0.25 mm water-stable aggregate content and soil nutrient in nearly mature forest land and mature forest land.
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