生态学杂志2025，Vol.44Issue(3)：869-874,6.DOI:10.13292/j.1000-4890.202503.028
亚热带不同林分类型对土壤团聚体中固氮基因丰度的影响
Effects of forest types on nitrogen-fixing gene abundance in soil aggregates from a subtropical forest
摘要
Abstract
With the increasing demands for wood resources under the social development,large areas of natural for-ests in China have been transformed into secondary forests or plantations.Different forest types can have profound effects on ecosystem structure and function.We examined the responses of the abundance of nifH genes in soils and aggregates to forest types,including Cunninghamia lanceolata plantation and Pinus massoniana plantation formed by reforestation after clearcutting of natural Castanopsis carlesii forest,as well as secondary C.carlesii forest formed after selective logging.Results showed that soil available phosphorus(AP)and soil moisture contents in both plan-tations were higher than those in the secondary forest.P.massoniana plantation had significantly higher AP content than the secondary forest and C.lanceolata plantation.The abundance of nifH genes(4.26×109 copies·g-1)in P massoniana plantation was significantly higher than that in secondary forest(2.16×109 copies·g-1)and C.lanceo-lata plantation(3.07×109 copies·g-1).The abundance of nifH genes was significantly and positively correlated with AP and moisture contents in bulk soils.Moreover,aggregate sizes had a significant effect on the abundance of the nifH genes,with the lowest abundance in silt-clay particles and the highest in small macroaggregates in all forest types.The abundance of nifH genes in different sizes of aggregates from the P.massoniana plantation was generally higher than that from the secondary forest and C.lanceolata plantation.Overall,both forest types and soil aggregate sizes significantly influenced the abundance of nifH genes in subtropical forests,with AP and moisture contents as the critical driving factors.关键词
菌根/林分类型/nifH基因/土壤团聚体Key words
mycorrhizae/forest type/nifH gene/soil aggregate引用本文复制引用
韩风毅,邓米林,宛颂,胥超,叶桂萍,贺纪正,林永新..亚热带不同林分类型对土壤团聚体中固氮基因丰度的影响[J].生态学杂志,2025,44(3):869-874,6.基金项目
国家自然科学基金项目(42077041和41930756)资助. （42077041和41930756）
