桂林红壤侵蚀区植被恢复过程的土壤理化性质变化

在广西桂林兴安县红壤侵蚀区人工设置4种植被恢复模式(阔叶树区、药材区、果树区和毛竹杉木区),研究不同人工植被恢复模式下林地土壤的理化性质与变化趋势,并与桂林灵川县境内自然植被演替过程的草丛阶段、灌丛阶段、针阔混交林阶段和常绿阔叶林阶段的土壤理化特性进行对比分析。结果表明,4种人工植被恢复模式下的土壤容重明显降低,含水量明显增加,与自然演替4个阶段的土壤容重和含水量变化一致。植被恢复过程中人工恢复模式和外套自然演替的土壤pH值均趋向增加,有机质含量和氮素含量均呈现增加趋势,但是土壤钾素含量与磷素含量都偏低,需要通过施肥加以缓解。在红壤侵蚀区通过人工手段进行植被恢复,能够改良土壤,提高土壤保肥培肥功能,对加速侵蚀区植被恢复有意义。

Soil Change of Physical and Chemical Characteristic during Vegetation Restoration in Eroded Area of Red Soil in Guilin

In this paper,soil physical and chemical characteristics of red soil under four modes of vegetation restoration(broadleaved tree area,herb area,fruit tree area,Mao bamboo and fir area) in eroded area and different stages of vegetation natural succession(grass mass,shrub mass,coniferous and broadleaved mixed forest,evergreen broadleaved forest)in Xing'an county were analyzed.The results show that in four artificial restoration modes,soil bulk density decline and soil moisture increase,which has the same trend with nature succession area.In both artificial restoration area and nature succession area,soil pH value and the content of organic matter and N increase but the content of K and P are too low and need to apply more fertilizer.The restoration of vegetation by artificial method in eroded area of red soil can improve the soil fertility,help the soil to keep and cultivate fertility,to accelerate the vegetation restoration in eroded area as well.