文献类型：期刊文献

英文题名：Soil pH and alkaline phosphatase-harboring microorganisms closely link to available phosphorus dynamics of Cunninghamia lanceolata plantations

作者：Wang, Song[1] Sun, Honggang[1] He, Gongxiu[2]

通信作者：Sun, HG[1]

机构：[1]Chinese Acad Forestry, Res Inst Subtrop Forestry, Hangzhou 311400, Zhejiang, Peoples R China;[2]Cent South Univ Forestry & Technol, Sch Forestry, Changsha 410004, Peoples R China

年份：2026

卷号：605

外文期刊名：FOREST ECOLOGY AND MANAGEMENT

收录：;EI(收录号：20260319932588);Scopus(收录号：2-s2.0-105027548619);WOS:【SCI-EXPANDED(收录号:WOS:001673768500001)】；

基金：This work was supported by the National Key Research and Devel-opment Program of China (grant no. 2024YFD2201202) .

语种：英文

外文关键词：Chinese fir chronosequence; Near-natural plantation; Soil microbial rejuvenation; Soil acidity; Phosphorus availability

摘要：Soil microorganisms play a pivotal role in regulating plant productivity and biogeochemical processes in forest ecosystems. Here, we investigated shifts in soil microbial community, chemical properties, and extracellular enzyme activities across a chronosequence of Cunninghamia lanceolata plantations aged 5-60 years. Our findings demonstrated that the Shannon diversity indices of both bacteria and fungi, along with the abundances of bacteria and fungi exhibited age-associated fluctuations. Fungal community composition exhibited differences between young with half-mature stages (5-20 years) and near-mature with mature stages (25-35 years), while that of bacteria displayed differences between young with half-mature stages (5-20 years) and overmature stages (41-60 years). Specifically, young and over-mature forests promoted oligotrophic and pathogenic taxa (i.e. class of Ustilaginomycetes and Dothideomycetes, and Chloroflexi phylum), while middle-aged stands enriched copiotrophic groups (i.e. phylum of Mortierellomycota and Rozellomycota). Except for soil pH, total nitrogen, and acid phosphatase, the variation ranges of soil nutrients and enzyme activities exceeded 50 % between the forest ages of 5 and 60 years. Soil factors including total phosphorus, pH, dissolved organic carbon, and NO3--N jointly explained 23.50 % and 17.52 % of the variations in bacterial and fungal communities, respectively. In addition, microbial network complexity and bacterial Shannon index exhibited a close relationship with soil available nitrogen and pH, respectively. The proposed mechanism suggests that the fluctuations in NH4+-N content driven by forest aging negatively influences soil pH, which subsequently lowers bacterial Shannon index and abundances of microorganisms secreting alkaline phosphatase, thereby reducing the availability of available phosphorus. Notably, natural understory colonization by broad-leaved trees shifted microbial communities to resemble those of 15-year-younger plantations, and their microbial community changes were closely related to dissolved organic carbon and Ascomycota phylum. Overall, our findings highlight stage-specific patterns in soil microbial diversity, abundance, and composition, which mediate nutrient transformations through distinct biogeochemical pathways in Cunninghamia lanceolata plantations.