DOI: 10.1111/gcb.12418
论文题名: Soil microbial and nutrient responses to 7 years of seasonally altered precipitation in a Chihuahuan Desert grassland
作者: Bell C.W. ; Tissue D.T. ; Loik M.E. ; Wallenstein M.D. ; Acosta-Martinez V. ; Erickson R.A. ; Zak J.C.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2014
卷: 20, 期: 5 起始页码: 1657
结束页码: 1673
语种: 英语
英文关键词: Big bend national park
; Desert ecosystems
; Extreme climate events
; Precipitation manipulation
; Soil microbial communities
Scopus关键词: belowground biomass
; climate change
; climate modeling
; extreme event
; grassland
; microbial community
; nutrient cycling
; phosphorus
; precipitation assessment
; rainfall
; soil biota
; soil microorganism
; Chihuahuan Desert
; Arbuscular
; rain
; soil
; Bacteria
; chemistry
; climate change
; desert climate
; fungus
; grassland
; metabolism
; microbiology
; microflora
; season
; soil
; United States
; Bacteria
; Climate Change
; Desert Climate
; Fungi
; Grassland
; Microbiota
; Rain
; Seasons
; Soil
; Soil Microbiology
; Texas
英文摘要: Soil microbial communities in Chihuahuan Desert grasslands generally experience highly variable spatiotemporal rainfall patterns. Changes in precipitation regimes can affect belowground ecosystem processes such as decomposition and nutrient cycling by altering soil microbial community structure and function. The objective of this study was to determine if increased seasonal precipitation frequency and magnitude over a 7-year period would generate a persistent shift in microbial community characteristics and soil nutrient availability. We supplemented natural rainfall with large events (one/winter and three/summer) to simulate increased precipitation based on climate model predictions for this region. We observed a 2-year delay in microbial responses to supplemental precipitation treatments. In years 3-5, higher microbial biomass, arbuscular mycorrhizae abundance, and soil enzyme C and P acquisition activities were observed in the supplemental water plots even during extended drought periods. In years 5-7, available soil P was consistently lower in the watered plots compared to control plots. Shifts in soil P corresponded to higher fungal abundances, microbial C utilization activity, and soil pH. This study demonstrated that 25% shifts in seasonal rainfall can significantly influence soil microbial and nutrient properties, which in turn may have long-term effects on nutrient cycling and plant P uptake in this desert grassland. © 2013 John Wiley & Sons Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62040
Appears in Collections: 影响、适应和脆弱性
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作者单位: Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, CO, 80524 - 1499, United States; Department of Biological Sciences, Texas Tech University, Lubbock, TX, 79409 - 3131, United States; Hawkesbury Institute for the Environment, University of Western Sydney, Richmond, NSW, 2753, Australia; Environmental Studies Department, University of California, Santa Cruz, CA, 95064, United States; USDA, Wind Erosion and Water Conservation Unit, 3810 4th Street, Lubbock, TX, 79415, United States; The Institute for Environment and Human Health, Department of Environmental Toxicology, Texas Tech University, Lubbock, TX, 79409 - 1163, United States
Recommended Citation:
Bell C.W.,Tissue D.T.,Loik M.E.,et al. Soil microbial and nutrient responses to 7 years of seasonally altered precipitation in a Chihuahuan Desert grassland[J]. Global Change Biology,2014-01-01,20(5)