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为探讨林地覆盖对雷竹林土壤硝化和反硝化作用的影响,以不覆盖雷竹林为对照,测定了林地覆盖期间(覆盖后30、60、90 d)雷竹林土壤基本理化性质,并用气压分离过程技术(Ba PS)测定了土壤硝化速率和反硝化速率。结果表明:覆盖措施和覆盖时间对雷竹林土壤硝化和反硝化作用均有显著影响,而且两者存在明显的交互作用;覆盖能促进雷竹林土壤反硝化作用,但长时间覆盖会抑制雷竹林土壤硝化作用;覆盖总体上会降低雷竹林土壤硝化速率、反硝化速率与土壤理化性质的相关性程度,并使土壤硝化和反硝化作用的主要环境影响因子趋于多样化和复杂化;覆盖雷竹林土壤硝化速率的主要环境影响因子是土壤含水量、p H值、铵态氮含量和总孔隙度,反硝化速率的主要环境影响因子是土壤p H值、含水量和总孔隙度。林地覆盖会显著影响雷竹林土壤的氮循环过程,可能会增加土壤氮素损失。
In order to explore the effects of forest cover on nitrification and denitrification in Phyllostachya forest, the basic physical and chemical properties of Phyllostachys praecox treated with forest coverage were measured at 30, 60, Technology (Ba PS) was used to determine soil nitrification rate and denitrification rate. The results showed that the mulching and the mulching time had significant effects on the nitrification and denitrification in Phyllostachys praecox soils, and there was a clear interaction between the two. The mulching could promote the denitrification in the soil, Nitrification, covering the whole will reduce the soil nitrification rate, denitrification rate and soil physical and chemical properties of the degree of correlation, and soil nitrification and denitrification of the main environmental factors tend to diversification and complexity; covering bamboo forest The main environmental influencing factors of soil nitrification rate are soil water content, p H value, ammonium nitrogen content and total porosity. The main environmental impact factors of soil denitrification rate are soil p H value, water content and total porosity. Forest cover can significantly affect soil nitrogen cycling in Phyllostachys pubescens forest and may increase soil nitrogen loss.