土地利用方式对土壤团聚体及微团聚体的影响

在宁夏固原上黄试验区，对灌木林地、农地、天然草地、果园和人工草地5种土壤的团粒结构和微团聚体结构进行了分析，探讨了土地利用方式对土壤结构性质的影响。结果表明：土壤团聚体总量：天然草地>灌木林地>果园>农地>人工草地；对于不同的用地类型，灌木林地及天然草地有利于形成大粒径的团聚体颗粒，而农地、果园和人工草地形成的团聚体颗粒粒径较小。土壤微团聚体：灌木林地和草地土壤1~0.01mm微团聚体含量较高，果园偏低；灌木林地和草地对于土壤微结构的形成有促进作用；果园表层土壤的微结构水稳性最差，灌木林地和人工草地最好。

Features of Soil Aggregate and Tiny Aggregate under Different Land Use

In Shanghuang NingXia Guyuan experimental region bush forestland, farmland, natural meadow, orchard and artificial meadow had been researched in this paper. The properties of soil aggregates and tiny aggregates under different usage modes had been researched. The results were shown: soil total aggregates was shown as natural meadow > bush forest land > orchard > farmland >artificial meadow; to different lands usage types, bush forest land and natural meadow had promote function to the development of larger particle diameter aggregates, but farmland, orchard and artificial meadow had the function to the smaller ones. Soil tiny aggregates was shown as higher content of 1-0.01mm tiny aggregates in bush forest land, artificial meadow and natural meadow, but orchard was lower comparatively; bush forest land and meadow had enhancing function to the formation of soil tiny structure; tiny structure for water stability of orchard was worst, but bush forest land and artificial meadow were best.