Linking microbial nutrient limitation and community composition to nitrogen mineralization in bamboo forest soil with phosphorus addition  

作　　者：Tong-Tao Hu Dong Bu Yang Zhang Fang-Chao Wang Jian-Jun Li Kui-Ling Zu Ming-Hui Meng Chao Liang Xiang-Min Fang 

机构地区：[1]Key Laboratory of National Forestry and Grassland Administration on Forest Ecosystem Protection and Restoration of Poyang Lake Watershed,College of Forestry,Jiangxi Agricultural University,Nanchang 330045,China [2]Long-term Research Base of National Forestry and Grassland Administration on Forest Vegetation Restoration in Degraded Red Soil Area of Jiangxi,College of Forestry,Jiangxi Agricultural University,Nanchang 330045,China [3]Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,China

出　　处：《Soil Ecology Letters》2025年第1期67-77,共11页土壤生态学快报(英文)

基　　金：supported by the Jiangxi“Double Thousand Plan”(Grant Nos.jxsq2019201080 and jxsq2019102031);the National Natural Science Foundation of China(Grant No.32260379,32371852);the Jiangxi Provincial Natural Science Foundation(Grant No.20242BAB26101);the Jiangxi Provincial Postgraduate Innovation Special Fund Project(Grant No.YC2023-S352).

摘　　要：The soil nitrogen(N)supply plays a core role in nutrient cycling,whereas phosphorus(P)is generally considered the limiting element of ecological processes in subtropical forests.However,the specific characteristics and regulatory mechanisms governing how P affects soil N mineralization remain incompletely understood.P fertilizer is often applied in bamboo forests,and we collected bulk soil and two types of rhizosphere soils(soils surrounding stump roots and rhizome roots,respectively)from a bamboo forest and conducted microcosm experiments with P addition(PA)to simulate the application of P fertilizer.The N mineralization and microbial and enzymatic parameters of the rhizosphere and bulk soils presented the same response to PA.PA increased the rate of net N mineralization and ammonification,suggesting that PA is beneficial to the N supply in the soil.PA increased the soil bacterial biomass but decreased the fungi:bacteria ratio.The soil enzyme C:N:P ratio indicated that the microbial community was subjected to P limitation.PA resulted in an increase in the enzyme C:P and N:P ratios and a decrease in the enzyme vector angle,suggesting alleviation of P limitation in the soil microbial community.Hierarchical partitioning and Pearson correlation analyses revealed that enzymatic stoichiometry and the vector angle were key regulators of soil N mineralization.These results indicate that PA can not only increase the concentration of soil P but also enhance the soil N supply in subtropical P-limited forests,primarily through changes in microbial nutrient limitation rather than in microbial biomass or community structure.

关 键 词：soil nitrogen mineralization phosphorus addition enzyme activity soil microorganisms moso bamboo forests 

分 类 号：S15[农业科学—土壤学]