DOI: 10.1016/j.scitotenv.2020.137559
论文题名: Grazing mediates soil microbial activity and litter decomposition in salt marshes
作者: Tang H. ; Nolte S. ; Jensen K. ; Yang Z. ; Wu J. ; Mueller P.
刊名: Science of the Total Environment
ISSN: 489697
出版年: 2020
卷: 720 语种: 英语
英文关键词: Blue carbon
; Carbon sequestration
; Enzyme stoichiometry
; Land-use change
; Livestock
; Tea Bag Index
Scopus关键词: Climate change
; Enzyme activity
; Forestry
; Land use
; Rate constants
; Sea level
; Soil mechanics
; Wetlands
; Accelerated sea-level rise
; Carbon sequestration
; Climate change mitigation
; Decomposition rate constants
; Land-use change
; Livestock
; Soil microbial activities
; Yangtze estuary , China
; Soils
; carbon
; nitrogen
; organic matter
; oxygen
; carbon sequestration
; enzyme activity
; land use change
; litter
; livestock
; microbial community
; numerical model
; saltmarsh
; soil microorganism
; stoichiometry
; Article
; assay
; biomass
; China
; controlled study
; enzyme activity
; grazing
; litter decomposition
; livestock
; microbial metabolism
; nonhuman
; plant litter
; priority journal
; salt marsh
; soil
; soil analysis
; soil bulk density
; soil microflora
; Tea Bag Index
; China
; Yangtze Estuary
英文摘要: Salt marshes contribute to climate change mitigation because of their great capacity to store organic matter (OM) in soils. Most of the research regarding OM turnover in salt marshes in times of global change focuses on effects of rising temperature and accelerated sea-level rise, while effects of land-use change have gained little attention. The present work investigates the mechanisms by which livestock grazing can affect OM decomposition in salt marsh soils. In a grazing exclusion experiment at the mouth of the Yangtze estuary, China, we assessed soil microbial exo-enzyme activity (EEA) to gain insight into the microbial carbon (C) and nitrogen (N) demand. Additionally, we studied the decomposition of plant litter in soil using the Tea Bag Index (TBI), a widely used standardized litter bag assay to fingerprint soil decomposition dynamics. Based on EEAs, grazing markedly reduced microbial C acquisition, whereas microbial N acquisition was strongly increased. These opposing grazing effects were also evident in the decomposition of standardized plant litter: The decomposition rate constant (k) and the stabilization (S) of litter were not inversely related, as would be expected, but instead both were reduced by livestock grazing. Our data suggest that gazing effects on EEAs and litter decomposition can just partly be explained by grazing-driven soil compaction and resulting lower oxygen availability, which has previously been hypothesized as a main pathway by which grazing can reduce microbial activity in wetland soils. Instead, grazing effects on microbial nutrient demand occurs to be an at least equally important control on soil decomposition processes. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158095
Appears in Collections: 气候变化与战略
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作者单位: Plant Ecology, Institute of Plant Science and Microbiology, Universität Hamburg, Ohnhorststr. 18, Hamburg, 22609, Germany; School of Environmental Sciences, University of East Anglia, Norwich Research Park, Norwich, NR4 7TJ, United Kingdom; Centre for Environment, Fisheries and Aquaculture Science, Pakefield Rd, Lowestoft, United Kingdom; Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, Coastal Ecosystems Research Station of Yangtze River Estuary, Institute of Biodiversity Science and Institute of Eco-Chongming, School of Life Sciences, Fudan University, Shanghai, 200433, China; Liupanshui Normal University, Liupanshui, 553000, China; Smithsonian Environmental Research Center, Contees Wharf Rd 647, Edgewater, MD 21037, United States
Recommended Citation:
Tang H.,Nolte S.,Jensen K.,et al. Grazing mediates soil microbial activity and litter decomposition in salt marshes[J]. Science of the Total Environment,2020-01-01,720