秦岭飞播林区不同植被对土壤养分含量的影响

通过对荒草地、农田、油松林及松栎混交林四种植被的养分效应分析比较,结果发现不同植被对土壤有机质、全氮、碱解氮、全磷和有效磷的效应不同,农田和松栎混交林对土壤有机质、全氮、碱解氮均呈正效应,尤其松栎混交林的作用更显著,其平均增长率分别为45.1%、47.8%、35.9%,与之相反,油松林对有机质、全氮、碱解氮的效应基本上是负效应,分别为-9.6%、-21.7%、-28.8%。但是从对全磷和有效磷效应方面看,荒草地和油松林具有较强的磷素积累能力,松栎混交林、农田都是耗磷型植被,不利于土壤磷素的积累和提高。

The Effect of Different Vegetation on Soil Nutrient Changes in Aerial Seeded Forest of Qinling Mountain

The analysis of the different vegetatioffs effect on soil nutrient changes indicated that different vegetation had different outcomes. Forests of mixed pines and oak and farmland had positive influences on organic matter, total nitrogen and available nitrogen in soil. Their additional rates were respectively 45.1 M ,47. 8 % ,35.9 %. On the contrary, forests of Pinus tabulaeformis had negative influences on those. Their additional rates were respectively -9.6% ,-21.7% ,-28.8%. In addition, herbage and forests of Pinus tabulaeformis were stronger than farmland and mixed forest in effect on total phosphorus and available phosphorus in soil. Fields of corn and mixed forest are vegetation of wasting phosphorus. They didfft benefit accumulation of phosphorus in soil.