DOI: 10.1111/gcb.12585
论文题名: Interactive biotic and abiotic regulators of soil carbon cycling: Evidence from controlled climate experiments on peatland and boreal soils
作者: Briones M.J.I. ; Mcnamara N.P. ; Poskitt J. ; Crow S.E. ; Ostle N.J.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2014
卷: 20, 期: 9 起始页码: 2971
结束页码: 2982
语种: 英语
英文关键词: Boreal forest
; C : N : P ratios
; Climate change
; Enchytraeids
; Peatlands
; Soil fauna
; Soil respiration
Scopus关键词: boreal forest
; carbon cycle
; climate change
; forest soil
; peatland
; soil carbon
; soil fauna
; soil moisture
; soil respiration
; Finland
; Ireland
; Spain
; Sweden
; United States
; Animalia
; Bacteria (microorganisms)
; Enchytraeidae
; carbon
; carbon dioxide
; fatty acid
; nitrogen
; phosphorus
; soil
; water
; analysis of variance
; biological model
; carbon cycle
; chemistry
; climate change
; comparative study
; Europe
; metabolism
; microbiology
; oxygen consumption
; physiology
; principal component analysis
; soil
; temperature
; Analysis of Variance
; Carbon Cycle
; Carbon Dioxide
; Carbon Radioisotopes
; Climate Change
; Europe
; Fatty Acids
; Models, Biological
; Nitrogen
; Oxygen Consumption
; Phosphorus
; Principal Component Analysis
; Soil
; Soil Microbiology
; Temperature
; Water
英文摘要: Partially decomposed plant and animal remains have been accumulating in organic soils (i.e. >40% C content) for millennia, making them the largest terrestrial carbon store. There is growing concern that, in a warming world, soil biotic processing will accelerate and release greenhouse gases that further exacerbate climate change. However, the magnitude of this response remains uncertain as the constraints are abiotic, biotic and interactive. Here, we examined the influence of resource quality and biological activity on the temperature sensitivity of soil respiration under different soil moisture regimes. Organic soils were sampled from 13 boreal and peatland ecosystems located in the United Kingdom, Ireland, Spain, Finland and Sweden, representing a natural resource quality range of C, N and P. They were incubated at four temperatures (4, 10, 15 and 20 °C) at either 60% or 100% water holding capacity (WHC). Our results showed that chemical and biological properties play an important role in determining soil respiration responses to temperature and moisture changes. High soil C : P and C : N ratios were symptomatic of slow C turnover and long-term C accumulation. In boreal soils, low bacterial to fungal ratios were related to greater temperature sensitivity of respiration, which was amplified in drier conditions. This contrasted with peatland soils which were dominated by bacterial communities and enchytraeid grazing, resulting in a more rapid C turnover under warmer and wetter conditions. The unexpected acceleration of C mineralization under high moisture contents was possibly linked to the primarily role of fermented organic matter, instead of oxygen, in mediating microbial decomposition. We conclude that to improve C model simulations of soil respiration, a better resolution of the interactions occurring between climate, resource quality and the decomposer community will be required. © 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/62122
Appears in Collections: 影响、适应和脆弱性
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作者单位: Departamento de Ecología y Biología Animal, Facultad de Biología, Universidad de Vigo, Vigo, 36310, Spain; Lancaster Environment Centre, Centre for Ecology and Hydrology, Library Avenue, Bailrigg, Lancaster, LA1 4AP, United Kingdom; Department of Natural Resources and Environmental Management, 1910 East-West Road Sherman 101, Honolulu, HI 96822, United States; Soil and Ecosystem Ecology Laboratory, Lancaster Environment Centre, Lancaster University, Bailrigg, Lancaster, LA1 4YQ, United Kingdom
Recommended Citation:
Briones M.J.I.,Mcnamara N.P.,Poskitt J.,et al. Interactive biotic and abiotic regulators of soil carbon cycling: Evidence from controlled climate experiments on peatland and boreal soils[J]. Global Change Biology,2014-01-01,20(9)