气候变化领域集成服务门户(CCPortal): Contrasting temperature responses of soil respiration derived from soil organic matter and added plant litter

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DOI	10.1007/s10533-020-00686-3
	Contrasting temperature responses of soil respiration derived from soil organic matter and added plant litter
	Robinson J.M.; Barker S.L.L.; Arcus V.L.; McNally S.R.; Schipper L.A.
发表日期	2020
ISSN	0168-2563
起始页码	45
结束页码	59
卷号	150 期号:1
英文摘要	Accurate description of temperature response and sensitivity of different carbon pools within soil is critical for accurately modelling soil carbon stocks and changes. Inconsistent sampling, incubation and fractionation methods highlights the need for new approaches to this area of study. We developed and tested a new protocol which allowed measurement of the temperature response of two carbon pools within soil. A Horotiu silt loam soil, wet up to 60% maximum water holding capacity, was mixed with 13C-enriched plant litter and incubated for 5 or 20 h, at 30 discrete temperatures (~ 2–50 °C). A mixing model was used to separate respired CO2 into litter and soil organic matter sourced carbon pools, which were then fitted using macromolecular rate theory. Overall, litter sourced respiration had a low Topt (the temperature where respiration rate is maximal) and was less temperature sensitive (Q10) than soil organic matter sourced respiration, which was more Arrhenius-like. We attribute these differences in temperature parameters to the factors that control the availability of carbon to microbes from the labile litter (enzyme kinetics with a clear temperature optimum) compared to the relatively stable soil organic matter (desorption and diffusion that exhibit Arrhenius behaviour). The developed method is rapid and reliable and may be suited to exploring temperature response of a variety of 13C-labelled pools in soil and more clearly demonstrates that labile carbon has very different temperature response than more stable carbon pools in soil. © 2020, Springer Nature Switzerland AG.
英文关键词	Carbon pools; Macromolecular rate theory; Respiration; Soil; Temperature sensitivity
语种	英语
scopus关键词	carbon dioxide; enzyme; enzyme activity; reaction kinetics; soil carbon; soil organic matter; soil respiration; water retention
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153118
作者单位	The University of Waikato, Private Bag 3105, Hamilton, 3240, New Zealand; ARC Centre of Excellence in Ore Deposits (CODES), School of Natural Sciences (Earth Sciences), University of Tasmania, Private Bag 79, Hobart, TAS 7001, Australia; Plant & Food Research, Private Bag 4704, Christchurch Mail Centre, Christchurch, 8140, New Zealand
推荐引用方式 GB/T 7714	Robinson J.M.,Barker S.L.L.,Arcus V.L.,et al. Contrasting temperature responses of soil respiration derived from soil organic matter and added plant litter[J],2020,150(1).
APA	Robinson J.M.,Barker S.L.L.,Arcus V.L.,McNally S.R.,&Schipper L.A..(2020).Contrasting temperature responses of soil respiration derived from soil organic matter and added plant litter.Biogeochemistry,150(1).
MLA	Robinson J.M.,et al."Contrasting temperature responses of soil respiration derived from soil organic matter and added plant litter".Biogeochemistry 150.1(2020).