期刊
SOIL BIOLOGY & BIOCHEMISTRY
卷 43, 期 12, 页码 2432-2440出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2011.08.010
关键词
CO2; C-14; delta C-13; Respiration; Climate change; Q(10); Temperature; Substrate quality; Moisture; Carbon cycling
类别
资金
- NERC
- Natural Environment Research Council [NRCF010001, ceh010023] Funding Source: researchfish
- NERC [NRCF010001] Funding Source: UKRI
Feedbacks to global warming may cause terrestrial ecosystems to add to anthropogenic CO2 emissions, thus exacerbating climate change. The contribution that soil respiration makes to these terrestrial emissions, particularly from carbon-rich soils such as peatlands, is of significant importance and its response to changing climatic conditions is of considerable debate. We collected intact soil cores from an upland blanket bog situated within the northern Pennines, England, UK and investigated the individual and interactive effects of three primary controls on soil organic matter decomposition: (i) temperature (5, 10 and 15 degrees C); (ii) moisture (50 and 100% field capacity - FC); and (iii) substrate quality, using increasing depth from the surface (0-10, 10-20 and 20-30 cm) as an analogue for increased recalcitrance of soil organic material. Statistical analysis of the results showed that temperature, moisture and substrate quality all significantly affected rates of peat decomposition. Q(10) values indicated that the temperature sensitivity of older/more recalcitrant soil organic matter significantly increased (relative to more labile peat) under reduced soil moisture (50% FC) conditions, but not under 100% FC, suggesting that soil microorganisms decomposing the more recalcitrant soil material preferred more aerated conditions. Radiocarbon analyses revealed that soil decomposers were able to respire older, more recalcitrant soil organic matter and that the source of the material (deduced from the delta C-13 analyses) subject to decomposition, changed depending on depth in the peat profile. (C) 2011 Elsevier Ltd. All rights reserved.
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