The temperature sensitivity of soil organic carbon decomposition is greater in subsoil than in topsoil during laboratory incubation

Abstract The turnover of soil organic carbon (SOC) in cropland plays an important role in terrestrial carbon cycling, but little is known about the temperature sensitivity (Q 10) of SOC decomposition below the topsoil layer of arable soil. Here, samples of topsoil (0–20 cm) and subsoil (20–40 cm) la...

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Autores principales:	Dong Yan, Jinquan Li, Junmin Pei, Jun Cui, Ming Nie, Changming Fang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/eccc243f712c4265ae0bab0d6b8e80ca
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spelling	oai:doaj.org-article:eccc243f712c4265ae0bab0d6b8e80ca2021-12-02T15:05:14ZThe temperature sensitivity of soil organic carbon decomposition is greater in subsoil than in topsoil during laboratory incubation10.1038/s41598-017-05293-12045-2322https://doaj.org/article/eccc243f712c4265ae0bab0d6b8e80ca2017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-05293-1https://doaj.org/toc/2045-2322Abstract The turnover of soil organic carbon (SOC) in cropland plays an important role in terrestrial carbon cycling, but little is known about the temperature sensitivity (Q 10) of SOC decomposition below the topsoil layer of arable soil. Here, samples of topsoil (0–20 cm) and subsoil (20–40 cm) layers were obtained from paddy fields and upland croplands in two regions of China. Using a sequential temperature changing method, soil respiration rates were calculated at different temperatures (8 °C to 28 °C) and fitted to an exponential equation to estimate Q 10 values. The average SOC decomposition rate was 59% to 282% higher in the topsoil than in the subsoil layer because of higher labile carbon levels in the topsoil. However, Q 10 values in the topsoil layer (5.29 ± 1.47) were significantly lower than those in the subsoil layer (7.52 ± 1.84). The pattern of Q 10 values between the topsoil and subsoil was significantly negative to labile carbon content, which is consistent with the carbon quality-temperature hypothesis. These results suggest that the high temperature sensitivity of SOC decomposition in the subsoil layer needs to be considered in soil C models to better predict the responses of agricultural SOC pools to global warming.Dong YanJinquan LiJunmin PeiJun CuiMing NieChangming FangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Dong Yan Jinquan Li Junmin Pei Jun Cui Ming Nie Changming Fang The temperature sensitivity of soil organic carbon decomposition is greater in subsoil than in topsoil during laboratory incubation
description	Abstract The turnover of soil organic carbon (SOC) in cropland plays an important role in terrestrial carbon cycling, but little is known about the temperature sensitivity (Q 10) of SOC decomposition below the topsoil layer of arable soil. Here, samples of topsoil (0–20 cm) and subsoil (20–40 cm) layers were obtained from paddy fields and upland croplands in two regions of China. Using a sequential temperature changing method, soil respiration rates were calculated at different temperatures (8 °C to 28 °C) and fitted to an exponential equation to estimate Q 10 values. The average SOC decomposition rate was 59% to 282% higher in the topsoil than in the subsoil layer because of higher labile carbon levels in the topsoil. However, Q 10 values in the topsoil layer (5.29 ± 1.47) were significantly lower than those in the subsoil layer (7.52 ± 1.84). The pattern of Q 10 values between the topsoil and subsoil was significantly negative to labile carbon content, which is consistent with the carbon quality-temperature hypothesis. These results suggest that the high temperature sensitivity of SOC decomposition in the subsoil layer needs to be considered in soil C models to better predict the responses of agricultural SOC pools to global warming.
format	article
author	Dong Yan Jinquan Li Junmin Pei Jun Cui Ming Nie Changming Fang
author_facet	Dong Yan Jinquan Li Junmin Pei Jun Cui Ming Nie Changming Fang
author_sort	Dong Yan
title	The temperature sensitivity of soil organic carbon decomposition is greater in subsoil than in topsoil during laboratory incubation
title_short	The temperature sensitivity of soil organic carbon decomposition is greater in subsoil than in topsoil during laboratory incubation
title_full	The temperature sensitivity of soil organic carbon decomposition is greater in subsoil than in topsoil during laboratory incubation
title_fullStr	The temperature sensitivity of soil organic carbon decomposition is greater in subsoil than in topsoil during laboratory incubation
title_full_unstemmed	The temperature sensitivity of soil organic carbon decomposition is greater in subsoil than in topsoil during laboratory incubation
title_sort	temperature sensitivity of soil organic carbon decomposition is greater in subsoil than in topsoil during laboratory incubation
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/eccc243f712c4265ae0bab0d6b8e80ca
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The temperature sensitivity of soil organic carbon decomposition is greater in subsoil than in topsoil during laboratory incubation

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