贵州茂兰喀斯特森林土壤微生物活性的研究

SOIL MICROBIAL ACTIVITIES IN MAOLAN KARST FOREST, GUIZHOU PROVINCE

通过研究不同植被类型下土壤微生物区系、土壤酶活性和土壤生化作用强度 ,分析了贵州茂兰国家级自然保护区喀斯特森林演替过程中土壤微生物活性的变化。结果表明 :随着喀斯特森林退化程度的加剧 ,土壤微生物总数下降、各主要生理类群数量均呈下降趋势 ,土壤酶活性减弱 ,土壤生化作用强度降低 ,对环境反应敏感 ,可作为反映森林生态系统的生物学指标。

Soil microflora, soil enzyme activity and soil biochemical function were studied under different types of vegetation and analyzed the changes of soil microbial activities during the process of forest succession in Maolan Karst Nature Reserve, in Guizhou Province. The results showed that, along with Karst forest degradation being intensified, the total population of major soil microbes was declining; the numbers of major physiological groups, including ammonifiers, cellulose decomposing microbes, nitrogen fixing bacteria were decreasing; the activity of soil enzymes, including urease, sucrase, proteinase, alkaline phosphatase, peroxidase, and polyphenol oxidase were weakening; soil biochemical functions, including ammonification, nitrification, nitrogen fixation and cellulose decomposition were being impaired. Soil microbes activities were sensitive to the process of forest degradation and could be deemed as microbial indicators of Karst forest ecology system. Soil microbes and enzyme activity were recommended as one of the major characteristics of ecological functions of Karst forest.