The carbon quality-temperature hypothesis does not consistently predict temperature sensitivity of soil organic matter mineralization in soils from two manipulative ecosystem experiments

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2017-10-28
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Bowden, Richard D. (Rich)
Reynolds, Lorien L.
Lajtha, Kate
Johnson, Bart R.
Bridgham, Scott D.
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Post-prints of this article will be available for viewing to the public after 10/28/2018.
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Abstract
The temperature sensitivity of soil organic matter (SOM) decomposition is a source of uncertainty in models of soil-climate feedbacks. However, empirical studies have given contradictory results concerning the temperature response of SOM fractions, even as the understanding of the chemical nature of SOM is evolving. The carbon-quality temperature (CQT) hypothesis states that more ‘recalcitrant’ SOM should have higher temperature sensitivity. Incubation studies have often shown a negative correlation between soil respiration rates and temperature sensitivity. However, there have been important exceptions to these results which challenge the assumption that older SOM is necessarily more chemically complex.
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Reynolds, L.L., Lajtha, K., Bowden, R.D. et al. (2017). The carbon quality-temperature hypothesis does not consistently predict temperature sensitivity of soil organic matter mineralization in soils from two manipulative ecosystem experiments. Biogeochemistry 136: 249-260. Doi: 10.1007/s10533-017-0384-z
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