首页|Long-term regional evidence of the effects of livestock grazing on soil microbial community structure and functions in surface and deep soil layers
Long-term regional evidence of the effects of livestock grazing on soil microbial community structure and functions in surface and deep soil layers
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
NSTL
Elsevier
? 2022 Elsevier LtdGrazing by livestock can affect plant biodiversity and topsoil functions. However, experimental evidence on whether these impacts are limited to the topsoil or penetrate into deep layers (via changes in soil environment and resource locations) of soil is lacking, especially for soil microbial biomass and diversity. Here, we used paired grazed and ungrazed (fenced) plots at 10 locations across the Mongolian Plateau to investigate how long-term (>10 years) livestock grazing affects the biomass, diversity, composition, and function of microbial communities in surface (0–20 cm) and deep soil layers (40–60 cm). Livestock grazing increased bacterial diversity by 5–9% in both soil layers but increased fungal diversity by 10% only in the topsoil. Livestock grazing also strongly altered bacterial and fungal community composition in both soil layers. Livestock grazing decreased soil C mineralization rates by 11–25% in both soil layers, and decreased soil N mineralization rates by 16% and bacterial biomass by 20% only in the topsoil. The grazing-induced increase in microbial diversity in both soil layers was mainly explained by the changes in plant C:N ratio and plant biomass rather than by soil abiotic variables, especially for the deep soil layer. The grazing-induced negative effects on ecosystem functions (soil C and N mineralization) were mainly associated with soil abiotic variables together with plant variables or microbial diversity in the surface soil layer and were mainly associated with plant variables and soil microbial diversity in the deep soil layer. Overall, our regional field experiment provides the first evidence that the strong effects of livestock grazing on soil microbial biomass, diversity, composition, and function can penetrate the deep soil in arid and semi-arid grasslands. This knowledge suggests that models should consider the dynamic interactions between land use and both soil microbial diversity and biomass across soil depths in global drylands.
Depth profileDrylandsEcosystem functionsLivestock grazingMicrobial community structureMicrobial diversityPlant–soil (below-ground) interactionsSoil mineralization
Chen D.、Liu S.、Wang B.、Wu J.、Bai Y.、Delgado-Baquerizo M.、Wu Y.、Hu S.
展开 >
Engineering Research Center of Eco-Environment in Three Gorges Reservoir Region of Ministry of Education China Three Gorges University
Key Laboratory of Soil Ecology and Health in Universities of Yunnan Province School of Ecology and Environmental Science Yunnan University
State Key Laboratory of Vegetation and Environmental Change Institute of Botany Chinese Academy of Sciences
Laboratorio de Biodiversidad y Funcionamiento Ecosistemico Instituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS) CSIC
Department of Plant Pathology North Carolina State University
NSTL
Elsevier
