DOI: 10.1111/gcb.12789
论文题名: Impacts of altered precipitation regimes on soil communities and biogeochemistry in arid and semi-arid ecosystems
作者: Nielsen U.N. ; Ball B.A.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期: 4 起始页码: 1407
结束页码: 1421
语种: 英语
英文关键词: Arid
; Biogeochemistry
; Climate change
; Dryland
; Microbes
; Nutrient dynamics
; Precipitation
; Semi-arid
; Soil fauna
; Soil respiration
Scopus关键词: arid region
; biogeochemistry
; climate change
; climate effect
; nutrient dynamics
; precipitation (climatology)
; semiarid region
; soil ecosystem
; soil fauna
; soil respiration
; Bacteria (microorganisms)
; Invertebrata
; rain
; soil
; animal
; biodiversity
; biomass
; chemistry
; climate change
; desert climate
; invertebrate
; microbiology
; physiology
; soil
; Animals
; Biodiversity
; Biomass
; Climate Change
; Desert Climate
; Invertebrates
; Rain
; Soil
; Soil Microbiology
英文摘要: Altered precipitation patterns resulting from climate change will have particularly significant consequences in water-limited ecosystems, such as arid to semi-arid ecosystems, where discontinuous inputs of water control biological processes. Given that these ecosystems cover more than a third of Earth's terrestrial surface, it is important to understand how they respond to such alterations. Altered water availability may impact both aboveground and belowground communities and the interactions between these, with potential impacts on ecosystem functioning; however, most studies to date have focused exclusively on vegetation responses to altered precipitation regimes. To synthesize our understanding of potential climate change impacts on dryland ecosystems, we present here a review of current literature that reports the effects of precipitation events and altered precipitation regimes on belowground biota and biogeochemical cycling. Increased precipitation generally increases microbial biomass and fungal:bacterial ratio. Few studies report responses to reduced precipitation but the effects likely counter those of increased precipitation. Altered precipitation regimes have also been found to alter microbial community composition but broader generalizations are difficult to make. Changes in event size and frequency influences invertebrate activity and density with cascading impacts on the soil food web, which will likely impact carbon and nutrient pools. The long-term implications for biogeochemical cycling are inconclusive but several studies suggest that increased aridity may cause decoupling of carbon and nutrient cycling. We propose a new conceptual framework that incorporates hierarchical biotic responses to individual precipitation events more explicitly, including moderation of microbial activity and biomass by invertebrate grazing, and use this framework to make some predictions on impacts of altered precipitation regimes in terms of event size and frequency as well as mean annual precipitation. While our understanding of dryland ecosystems is improving, there is still a great need for longer term in situ manipulations of precipitation regime to test our model. © 2014 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61657
Appears in Collections: 影响、适应和脆弱性
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作者单位: Hawkesbury Institute for the Environment and School of Science and Health, University of Western Sydney, Penrith, NSW, Australia; School of Mathematical and Natural Sciences, Arizona State University at the West Campus, Phoenix, AZ, United States
Recommended Citation:
Nielsen U.N.,Ball B.A.. Impacts of altered precipitation regimes on soil communities and biogeochemistry in arid and semi-arid ecosystems[J]. Global Change Biology,2015-01-01,21(4)