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土壤微生物生物量在森林生态系统保护以及养分循环转化中具有重要的作用。本文研究了西双版纳5种森林类型(热带季节雨林、热带季风常绿阔叶林、曼安次生林、鸡血藤次生林和沟谷林次生林)的土壤微生物生物量以及微生物碳氮利用效率的变化。与热带季节雨林和热带季风常绿阔叶林相比,3种次生林具有较高的土壤微生物生物量碳。沟谷林次生林的土壤微生物生物量碳氮含量显著高于其它4种林型。土壤微生物生物量碳氮与土壤含水量、土壤有机碳、土壤总氮显著正相关,与土壤碳氮比显著负相关。热带季节雨林和沟谷林次生林有更高的微生物商,表明热带季节雨林和沟谷林次生林具有更高的微生物碳氮利用效率。微生物商的变化与土壤有机碳以及土壤总氮没有显著相关关系,与土壤微生物生物量显著正相关。本研究可为更好地评价不同森林类型土壤活性提供理论依据。
Soil microbial biomass plays an important role in forest ecosystem protection and nutrient cycling. In this paper, the changes of soil microbial biomass and microbial C and N utilization efficiency in five forest types (tropical seasonal rain forest, tropical monsoon evergreen broad-leaved forest, Manan secondary forest, Millettia alterniflora and secondary forest) were studied. Compared with tropical seasonal rain forest and tropical monsoon evergreen broad-leaved forest, the three secondary forests had higher soil microbial biomass carbon. The soil microbial biomass carbon and nitrogen in the secondary forests of Gougulin was significantly higher than the other four forest types. Soil microbial biomass C and N was significantly and positively correlated with soil moisture content, soil organic carbon and soil total nitrogen, but significantly negatively correlated with soil C and N ratio. Tropical monsoon rain forests and gulch forest secondary forests have higher microbial quotients, indicating that tropical seasonal rain forests and gulch forest secondary forests have higher microbial carbon and nitrogen use efficiency. There was no significant correlation between microbial quotient and soil organic carbon and soil total nitrogen, which was positively correlated with soil microbial biomass. This study can provide a theoretical basis for better evaluation of soil activity in different forest types.