globalchange  > 气候减缓与适应
DOI: 10.1007/s10533-018-0443-0
Scopus记录号: 2-s2.0-85045431205
论文题名:
Geothermally warmed soils reveal persistent increases in the respiratory costs of soil microbes contributing to substantial C losses
作者: Marañón-Jiménez S.; Soong J.L.; Leblans N.I.W.; Sigurdsson B.D.; Peñuelas J.; Richter A.; Asensio D.; Fransen E.; Janssens I.A.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2018
起始页码: 1
结束页码: 16
语种: 英语
英文关键词: Metabolic quotient ; Microbial biomass ; Microbial physiology ; Q10 ; Soil CO2 fluxes ; Soil respiration ; Temperature increase
英文摘要: Increasing temperatures can accelerate soil organic matter decomposition and release large amounts of CO2 to the atmosphere, potentially inducing positive warming feedbacks. Alterations to the temperature sensitivity and physiological functioning of soil microorganisms may play a key role in these carbon (C) losses. Geothermally active areas in Iceland provide stable and continuous soil temperature gradients to test this hypothesis, encompassing the full range of warming scenarios projected by the Intergovernmental Panel on Climate Change for the northern region. We took soils from these geothermal sites 7 years after the onset of warming and incubated them at varying temperatures and substrate availability conditions to detect persistent alterations of microbial physiology to long-term warming. Seven years of continuous warming ranging from 1.8 to 15.9 °C triggered a 8.6–58.0% decrease on the C concentrations in the topsoil (0–10 cm) of these sub-arctic silt-loam Andosols. The sensitivity of microbial respiration to temperature (Q10) was not altered. However, soil microbes showed a persistent increase in their microbial metabolic quotients (microbial respiration per unit of microbial biomass) and a subsequent diminished C retention in biomass. After an initial depletion of labile soil C upon soil warming, increasing energy costs of metabolic maintenance and resource acquisition led to a weaker capacity of C stabilization in the microbial biomass of warmer soils. This mechanism contributes to our understanding of the acclimated response of soil respiration to in situ soil warming at the ecosystem level, despite a lack of acclimation at the physiological level. Persistent increases in the respiratory costs of soil microbes in response to warming constitute a fundamental process that should be incorporated into climate change-C cycling models. © 2018 Springer International Publishing AG, part of Springer Nature
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83163
Appears in Collections:气候减缓与适应
气候变化事实与影响

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作者单位: Atmospheric Physics Group (GFAT), Department of Applied Physics, Faculty of Sciences, University of Granada, Granada, Spain; Centre of Excellence PLECO (Plant and Vegetation Ecology), Department of Biology, University of Antwerpen, Campus Drie Eiken, Universiteitsplein 1, C. 203, Wilrijk, Belgium; Agricultural University of Iceland, Hvanneyri 311, Borgarnes, Iceland; Cerdanyola del Vallès, Barcelona, Catalonia, Spain; CSIC, Global Ecology Unit CREAF-CSIC-UAB, Bellaterra, Barcelona, Catalonia, Spain; Department of Microbiology and Ecosystem Science, University of Vienna, Althanstraße 14, Vienna, Austria; StatUa Center for Statistics, University of Antwerp, Antwerp, Belgium

Recommended Citation:
Marañón-Jiménez S.,Soong J.L.,Leblans N.I.W.,et al. Geothermally warmed soils reveal persistent increases in the respiratory costs of soil microbes contributing to substantial C losses[J]. Biogeochemistry,2018-01-01
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