Journal
SOIL BIOLOGY & BIOCHEMISTRY
Volume 42, Issue 9, Pages 1653-1656Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2010.05.026
Keywords
Decomposition; Ecosystem modelling; Priming effect; Q(10); Rhizosphere; Soil CO2 efflux; Soil respiration; Soil temperature; Soil organic matter; Belowground carbon allocation
Categories
Funding
- UK Natural Environment Research Council (NERC) [NE/E004512/1]
- Austrian Science Fund (FWF) [P18756-B16, P22214-B17]
- NERC [NE/E004512/1] Funding Source: UKRI
- Austrian Science Fund (FWF) [P22214] Funding Source: Austrian Science Fund (FWF)
- Austrian Science Fund (FWF) [P 22214] Funding Source: researchfish
- Natural Environment Research Council [NE/E004512/1] Funding Source: researchfish
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The temperature dependence of soil respiration (R-S) is widely used as a key characteristic of soils or organic matter fractions within soils, and in the context of global climatic change is often applied to infer likely responses of R-S to warmer future conditions. However, the way in which these temperature dependencies are calculated, interpreted and implemented in ecosystem models requires careful consideration of possible artefacts and assumptions. We argue that more conceptual clarity in the reported relationships is needed to obtain meaningful meta-analyses and better constrained parameters informing ecosystem models. Our critical assessment of common methodologies shows that it is impossible to measure actual temperature response of R-S, and that a range of confounding effects creates the observed apparent temperature relations reported in the literature. Thus, any measureable temperature response function will likely fail to predict effects of climate change on R-S. For improving our understanding of R-S in changing environments we need a better integration of the relationships between substrate supply and the soil biota, and of their long-term responses to changes in abiotic soil conditions. This is best achieved by experiments combining isotopic techniques and ecosystem manipulations, which allow a disentangling of abiotic and biotic factors underlying the temperature response of soil CO2 efflux. (C) 2010 Elsevier Ltd. All rights reserved.
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