首页|Nitrogen enrichment stimulates nutrient cycling genes of rhizosphere soil bacteria in the Phoebe bournei young plantations
Nitrogen enrichment stimulates nutrient cycling genes of rhizosphere soil bacteria in the Phoebe bournei young plantations
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NETL
NSTL
Elsevier
Anthropogenic nitrogen (N) deposition is expected to increase substantially and continuously in terrestrial ecosystems, endangering the balance of N and phosphorus (P) in P-deficient subtropical forest soil. Despite the widely reported responses of the microbial community to simulated N deposition, there is limited understanding of how N deposition affects the rhizosphere soil processes by mediating functional genes and community compositions of soil bacteria. Here, five levels of simulated N deposition treatments (N0, 0 g m~(-2)·yr~(-1); N1, 100 g m~(-2)·yr~(-1); N2, 200 g m~(-2)·yr~(-1); N3, 300 g m~(-2)·yr~(-1); and N4, 400 g m~(-2)·yr~(-1)) were performed in a 10-year-old Phoebe bournei plantation. Quantitative microbial element cycling smart chip technology and 16S rRNA gene sequencing were employed to analyze functional gene compositions involved in carbon (C), N, and P cycling, as well as rhizosphere bacterial community composition. N deposition significantly influenced C cycling relative abundance of genes in the rhizosphere soil, especially those involved in C degradation. Low and moderate levels (100-300 g m~(-2)·yr~(-1)) of N deposition promoted the relative abundance of the C decomposition-related genes (e. g., amyA, abfA, pgu, chiA, cex, cdh, and glx), whereas high N deposition (400 g m~(-2)·yr~(-1)) suppressed enzyme (e. g., soil invertase, soil urease, and soil acid phosphatase) activities, affecting the C cycling processes in the rhizosphere. Simulated N deposition affected the functional genes associated with C, N, and P cycling by mediating soil pH and macronutrients. These findings provide new insights into the management of soil C sequestration in P. bournei young plantations as well as the regulation of C, N, and P cycling and microbial functions within ecosystems.
Nitrogen depositionRhizosphere soilSoil bacterial communityPhoebe bournei young plantationsFunctional genes
Ziqiao Yang、Gongxiu He、Qingsheng Yang、Dongdong Zhang、Ying Zhang、Shizhi Wen、Xisha Yang、Lili Yang、Li Ji
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School of Forestry,Central South University of Forestry and Technology,Changsha,410004,PR China||Department of Soil and Water Conservation,Central South University of Forestry and Technology,Changsha,410004,PR China
Nuclear Geological Survey Institute of Hunan Province,410007,PR China
Ecology Geological Survey and Monitoring Institute of Hunan Province,410119,PR China
School of Forestry,Central South University of Forestry and Technology,Changsha,410004,PR China
NETL
NSTL
Elsevier
