首页|Linking microbial nutrient limitation and community composition to nitrogen mineralization in bamboo forest soil with phosphorus addition
Linking microbial nutrient limitation and community composition to nitrogen mineralization in bamboo forest soil with phosphorus addition
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
万方数据
维普
Linking microbial nutrient limitation and community composition to nitrogen mineralization in bamboo forest soil with phosphorus addition
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 regula-tory mechanisms governing how P affects soil N mineral-ization 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 addi-tion(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 mineral-ization 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.
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
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
Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,China
万方数据
维普
