退化喀斯特植被不同恢复阶段土壤质量变化

Soil Quality Changes during the Process of Vegetation Restoration in Degraded Karst

为探讨退化喀斯特生态系统植被恢复对土壤质量的改良效果。本文对花江流域退化喀斯特植被不同演替阶段的土壤的石砾含量、含水量、容重、持水量、孔隙度、pH值、有机质、全氮、全磷、全钾、碱解氮及速效P、K等理化指标进行测定分析。结果表明:植被恢复促进了喀斯特山地土壤pH值降低、控制了土壤pH值的上升。土壤石砾含量随植被恢复而下降;有机质含量随植被恢复而上升。在整个演替的过程中,全氮、全磷、全钾、碱解氮及速效P、K含量随植被的恢复而呈波动变化的趋势;土壤质量的生境变化总体上表现为石沟较高。综合分析表明,研究区植被恢复总体上促进了土壤理化质量的提高。

In order to explore the improvement effect of vegetation restoration on soil quality in degraded karst ecosystem,the paper measured and analyzed soil physical and chemical indicators of gravel content,moisture content,bulk density,water holding capacity,porosity,pH,organic matter,total nitrogen,total phosphorus,total potassium,nitrogen and available P,K in different succession stage of Huajiang karst degeneration forest. The resultsindicated that vegetation restoration caused reduction of karst soil pH and controlledincrease of soil pH,thus reducing soil gravel content and increasing organic matter content. Throughout the whole succession,the total nitrogen,total phosphorus,total potassium,nitrogen and available P,K contents changed with vegetation restoration in a fluctuatingway. Generally,Gully soil quality was higher overall in habitat change. Comprehensive analysis showed that the vegetation recovery improved physical and chemical quality of soil.