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Substrate quality and the temperature sensitivity of soil organic matter decomposition

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Substrate quality and the temperature sensitivity of soil organic matter decomposition. / Hartley, Iain P.; Ineson, Phil.

In: Soil Biology and Biochemistry, Vol. 40, No. 7, 07.2008, p. 1567-1574.

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Harvard

Hartley, IP & Ineson, P 2008, 'Substrate quality and the temperature sensitivity of soil organic matter decomposition', Soil Biology and Biochemistry, vol. 40, no. 7, pp. 1567-1574. https://doi.org/10.1016/j.soilbio.2008.01.007

APA

Hartley, I. P., & Ineson, P. (2008). Substrate quality and the temperature sensitivity of soil organic matter decomposition. Soil Biology and Biochemistry, 40(7), 1567-1574. https://doi.org/10.1016/j.soilbio.2008.01.007

Vancouver

Hartley IP, Ineson P. Substrate quality and the temperature sensitivity of soil organic matter decomposition. Soil Biology and Biochemistry. 2008 Jul;40(7):1567-1574. https://doi.org/10.1016/j.soilbio.2008.01.007

Author

Hartley, Iain P. ; Ineson, Phil. / Substrate quality and the temperature sensitivity of soil organic matter decomposition. In: Soil Biology and Biochemistry. 2008 ; Vol. 40, No. 7. pp. 1567-1574.

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@article{9995ccb702304a23bbc6c9d204e4b02d,
title = "Substrate quality and the temperature sensitivity of soil organic matter decomposition",
abstract = "Determining the relative temperature sensitivities of the decomposition of the different soil organic matter (SOM) pools is critical for predicting the long-term impacts of climate change on soil carbon (C) storage. Although kinetic theory suggests that the temperature sensitivity of SOM decomposition should increase with substrate recalcitrance, there remains little empirical evidence to support this hypothesis. In the study presented here, sub-samples from a single bulk soil sample were frozen and sequentially defrosted to produce samples of the same soil that had been incubated for different lengths of time, up to a maximum of 124 days. These samples were then placed into an incubation system which allowed CO2 production to be monitored constantly and the response of soil respiration to short-term temperature manipulations to be investigated. The temperature sensitivity of soil CO2 production increased significantly with incubation time suggesting that, as the most labile SOM pool was depleted the temperature sensitivity of SOM decomposition increased. This study is therefore one of the first to provide empirical support for kinetic theory. Further, using a modelling approach, we demonstrate that it is the temperature sensitivity of the decomposition of the more recalcitrant SOM pools that will determine long-term soil-C losses. Therefore, the magnitude of the positive feedback to global warming may have been underestimated in previous modelling studies. (c) 2008 Elsevier Ltd. All rights reserved.",
keywords = "soil organic matter, temperature, labile, recalcitrant, CO2, respiration, climate change, feedback, CARBON MINERALIZATION, CLIMATE-CHANGE, CO2 EMISSIONS, RESPIRATION, DEPENDENCE, TURNOVER, MODEL, RADIOCARBON, PREDICTIONS, FEEDBACKS",
author = "Hartley, {Iain P.} and Phil Ineson",
year = "2008",
month = "7",
doi = "10.1016/j.soilbio.2008.01.007",
language = "English",
volume = "40",
pages = "1567--1574",
journal = "Soil Biology and Biochemistry",
issn = "0038-0717",
publisher = "Elsevier Limited",
number = "7",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Substrate quality and the temperature sensitivity of soil organic matter decomposition

AU - Hartley, Iain P.

AU - Ineson, Phil

PY - 2008/7

Y1 - 2008/7

N2 - Determining the relative temperature sensitivities of the decomposition of the different soil organic matter (SOM) pools is critical for predicting the long-term impacts of climate change on soil carbon (C) storage. Although kinetic theory suggests that the temperature sensitivity of SOM decomposition should increase with substrate recalcitrance, there remains little empirical evidence to support this hypothesis. In the study presented here, sub-samples from a single bulk soil sample were frozen and sequentially defrosted to produce samples of the same soil that had been incubated for different lengths of time, up to a maximum of 124 days. These samples were then placed into an incubation system which allowed CO2 production to be monitored constantly and the response of soil respiration to short-term temperature manipulations to be investigated. The temperature sensitivity of soil CO2 production increased significantly with incubation time suggesting that, as the most labile SOM pool was depleted the temperature sensitivity of SOM decomposition increased. This study is therefore one of the first to provide empirical support for kinetic theory. Further, using a modelling approach, we demonstrate that it is the temperature sensitivity of the decomposition of the more recalcitrant SOM pools that will determine long-term soil-C losses. Therefore, the magnitude of the positive feedback to global warming may have been underestimated in previous modelling studies. (c) 2008 Elsevier Ltd. All rights reserved.

AB - Determining the relative temperature sensitivities of the decomposition of the different soil organic matter (SOM) pools is critical for predicting the long-term impacts of climate change on soil carbon (C) storage. Although kinetic theory suggests that the temperature sensitivity of SOM decomposition should increase with substrate recalcitrance, there remains little empirical evidence to support this hypothesis. In the study presented here, sub-samples from a single bulk soil sample were frozen and sequentially defrosted to produce samples of the same soil that had been incubated for different lengths of time, up to a maximum of 124 days. These samples were then placed into an incubation system which allowed CO2 production to be monitored constantly and the response of soil respiration to short-term temperature manipulations to be investigated. The temperature sensitivity of soil CO2 production increased significantly with incubation time suggesting that, as the most labile SOM pool was depleted the temperature sensitivity of SOM decomposition increased. This study is therefore one of the first to provide empirical support for kinetic theory. Further, using a modelling approach, we demonstrate that it is the temperature sensitivity of the decomposition of the more recalcitrant SOM pools that will determine long-term soil-C losses. Therefore, the magnitude of the positive feedback to global warming may have been underestimated in previous modelling studies. (c) 2008 Elsevier Ltd. All rights reserved.

KW - soil organic matter

KW - temperature

KW - labile

KW - recalcitrant

KW - CO2

KW - respiration

KW - climate change

KW - feedback

KW - CARBON MINERALIZATION

KW - CLIMATE-CHANGE

KW - CO2 EMISSIONS

KW - RESPIRATION

KW - DEPENDENCE

KW - TURNOVER

KW - MODEL

KW - RADIOCARBON

KW - PREDICTIONS

KW - FEEDBACKS

UR - http://www.scopus.com/inward/record.url?scp=46449139858&partnerID=8YFLogxK

U2 - 10.1016/j.soilbio.2008.01.007

DO - 10.1016/j.soilbio.2008.01.007

M3 - Article

VL - 40

SP - 1567

EP - 1574

JO - Soil Biology and Biochemistry

T2 - Soil Biology and Biochemistry

JF - Soil Biology and Biochemistry

SN - 0038-0717

IS - 7

ER -