摘要
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 crucial role in forest nutrient. Five forest types were studied to examine the changes ecosystem conservation and cycle and transformation of in soil microbial biomass and microbial quotient. Three secondary forests showed higher soil microbial biomass carbon than tropical seasonal rainforest and tropical monsoon evergreen broad-leaved forest. Soil microbial biomass carbon and nitrogen were the highest in ravine secondary forest. There were significantly positive relationships of soil microbial biomass carbon and nitrogen to soil gravimetric water content, soil organic carbon and total soil nitrogen, but negative to the ratio of soil organic carbon to total soil nitrogen. Higher microbial quotient in tropical seasonal rainforest and ravine secondary forest indicated the higher microbial use efficiency for carbon and nitrogen. Microbial quotient was not significantly related with soil organic carbon and nitrogen, and positively with soil microbial biomass. This study would contribute to assess soil activity under different forest types.
出处
《土壤通报》
CAS
北大核心
2017年第1期94-100,共7页
Chinese Journal of Soil Science
基金
国家自然科学基金项目(41501282)
中国科学院战略性先导科技专项项目(XDB15010303)资助
