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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。
Four vegetation restoration models (broadleaf tree, medicinal tree, fruit tree and Phyllostachys praecox) were artificially set up in the red soil erosion area of Xing’an County, Guilin, Guangxi Province to study the physical and chemical properties and the changing trend of forest soil under different artificial vegetation restoration patterns. In the grassland, shrub stage, coniferous and broad-leaved mixed forest and the evergreen broad-leaved forest during the natural vegetation succession in Chuan County, the soil physical and chemical properties were compared. The results showed that the soil bulk density of four artificial vegetation restoration modes decreased significantly, and the water content increased obviously, which was consistent with the change of soil bulk density and water content in four stages of natural succession. During the process of vegetation restoration, the artificial recovery pattern and the natural succession of soil in the coat all tended to increase. Both the organic matter content and the nitrogen content tended to increase. However, both the soil potassium content and the phosphorus content were low, and the soil fertilization needed to be alleviated. Restoration of vegetation by artificial means in the red soil erosion area can improve the soil and improve soil fertility and fertility, which is significant for accelerating vegetation restoration in the eroded area.