西双版纳不同森林类型土壤微生物生物量的变化

发布时间：2018-07-05 09:30

本文选题：森林类型 + 土壤有机质　；参考：《土壤通报》2017年01期

【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。
[Abstract]:Soil microbial biomass plays an important role in forest ecosystem protection and nutrient cycling. The changes of soil microbial biomass and microbial carbon and nitrogen use efficiency of five forest types (tropical seasonal rain forest, tropical monsoon evergreen broad-leaved forest, Manan secondary forest, secondary forest of Ampelopsis chinensis and secondary forest of gully forest) in Xishuangbanna were studied in this paper. Compared with tropical seasonal rain forest and tropical monsoon evergreen broad-leaved forest, three secondary forests have higher soil microbial biomass carbon. Soil microbial biomass carbon and nitrogen content in gully secondary forest was significantly higher than that in other four forest types. Soil microbial biomass carbon and nitrogen were positively correlated with soil water content, soil organic carbon and soil total nitrogen, but negatively correlated with soil C / N ratio. There were higher microbial quotient in tropical seasonal rainforest and gully forest secondary forest, which indicated that tropical seasonal rainforest and gully forest secondary forest had higher microbial carbon and nitrogen utilization efficiency. The change of microbial quotient was not significantly correlated with soil organic carbon and soil total nitrogen, but positively correlated with soil microbial biomass. This study can provide theoretical basis for better evaluation of soil activity of different forest types.
【作者单位】：吉林师范大学;中国科学院沈阳应用生态研究所;中国科学院西双版纳植物园;
【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
【分类号】：S714.3

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