苏北山丘区森林群落次生演替中土壤化学性质的时空属性研究

选择苏北山丘区典型、有代表性的不同演替阶段森林群落进行植被调查和土壤分析。结果表明,土壤化学性质在演替方向和土壤剖面上表现出较强的规律:土壤有机质随植被从低级向高级演进逐渐积累;土壤全N、碱解氮和速效钾等也呈上升趋势。在土壤剖面上,有机质、全N等指标表现出A层>B层>C层的趋势,同时土壤化学性质的空间变化趋势是与植物群落的演替进程相适应的,随着大量凋落物在表层聚集,土壤肥力呈明显上升趋势。

Research on the time-space attributes of soil chemical properties in secondary forest succession of hilly area in North Jiangsu

The vegetation investigation and soil analysis were made by collecting typically representative different succession community vegetation.The results show that the soil chemical properties are quite regular in the succession direction and soil profile.The organic matter accumulates gradually during the evolution from low to advanced class and the soil total N,available nitrogen and potassium show an increasing tendency.The organic matter and total N index tend to be Horizon A>Horizon B>Horizon C on soil profile.Besides the spatial variation tendency of the soil chemical properties adaptive to progression of succession,the soil fertility tend to be increasing with large amount of litter aggregated on the surface.