The response of heterotrophic CO2-flux to soil warming

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The response of heterotrophic CO2-flux to soil warming. / Eliasson, Peter; McMurtrie, Ross E.; Pepper, David A.; Strömgren, Monika; Linder, Sune; Ågren, Göran I.

I: Global Change Biology, Vol. 11, Nr. 1, 2005, s. 167-181.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Harvard

Eliasson, P, McMurtrie, RE, Pepper, DA, Strömgren, M, Linder, S & Ågren, GI 2005, 'The response of heterotrophic CO2-flux to soil warming', Global Change Biology, vol. 11, nr. 1, s. 167-181. https://doi.org/10.1111/j.1365-2486.2004.00878.x

APA

Eliasson, P., McMurtrie, R. E., Pepper, D. A., Strömgren, M., Linder, S., & Ågren, G. I. (2005). The response of heterotrophic CO2-flux to soil warming. Global Change Biology, 11(1), 167-181. https://doi.org/10.1111/j.1365-2486.2004.00878.x

CBE

Eliasson P, McMurtrie RE, Pepper DA, Strömgren M, Linder S, Ågren GI. 2005. The response of heterotrophic CO2-flux to soil warming. Global Change Biology. 11(1):167-181. https://doi.org/10.1111/j.1365-2486.2004.00878.x

MLA

Vancouver

Eliasson P, McMurtrie RE, Pepper DA, Strömgren M, Linder S, Ågren GI. The response of heterotrophic CO2-flux to soil warming. Global Change Biology. 2005;11(1):167-181. https://doi.org/10.1111/j.1365-2486.2004.00878.x

Author

Eliasson, Peter ; McMurtrie, Ross E. ; Pepper, David A. ; Strömgren, Monika ; Linder, Sune ; Ågren, Göran I. / The response of heterotrophic CO2-flux to soil warming. I: Global Change Biology. 2005 ; Vol. 11, Nr. 1. s. 167-181.

RIS

TY - JOUR

T1 - The response of heterotrophic CO2-flux to soil warming

AU - Eliasson, Peter

AU - McMurtrie, Ross E.

AU - Pepper, David A.

AU - Strömgren, Monika

AU - Linder, Sune

AU - Ågren, Göran I.

N1 - 1

PY - 2005

Y1 - 2005

N2 - In a forest ecosystem at steady state, net carbon (C) assimilation by plants and C loss through soil and litter decomposition by heterotrophic organisms are balanced. However, a perturbation to the system, such as increased mean soil temperature, will lead to faster decay, enhancing CO2 release from decomposers, and thus upsetting the balance. Recent in situ experiments have indicated that the stimulation of soil respiration following a step increase in annual average soil temperature declines over time. One possible explanation for this decline may be changes in substrate availability. This hypothesis is examined by using the ecosystem model G'DAY, which simulates C and nitrogen (N) dynamics in plants and soil. We applied the model to observations from a soil-warming experiment in a Norway spruce (Picea abies (L.) Karst.) stand by simulating a step increase of soil temperature. The model provided a good qualitative reproduction of the observed reduction of heterotrophic respiration (R-h) under sustained warming. The simulations showed how the combined effects of faster turnover and reduced substrate availability lead to a transient increase of R-h. The simulated annual increase in R-h from soil was 60% in the first year after perturbation but decreased to 30% after a decade. One conclusion from the analysis of the simulations is that R-h can decrease even though the temperature response function for decomposition remains unchanged. G'DAY suggests that acclimation of R-h to soil warming is partly an effect of substrate depletion of labile C pools during the first decade of warming as a result of accelerated rates of mineralization. The response is attributed mainly to changing levels of C in pools with short time constants, reflecting the importance of high-quality soil C fractions. Changes of the structure or physiology of the decomposer community were not invoked. Therefore, it becomes a question of definition whether the simulated dynamics of the declining response of CO2 release to the warming should be named acclimation or seen as a natural part of the system dynamics.

AB - In a forest ecosystem at steady state, net carbon (C) assimilation by plants and C loss through soil and litter decomposition by heterotrophic organisms are balanced. However, a perturbation to the system, such as increased mean soil temperature, will lead to faster decay, enhancing CO2 release from decomposers, and thus upsetting the balance. Recent in situ experiments have indicated that the stimulation of soil respiration following a step increase in annual average soil temperature declines over time. One possible explanation for this decline may be changes in substrate availability. This hypothesis is examined by using the ecosystem model G'DAY, which simulates C and nitrogen (N) dynamics in plants and soil. We applied the model to observations from a soil-warming experiment in a Norway spruce (Picea abies (L.) Karst.) stand by simulating a step increase of soil temperature. The model provided a good qualitative reproduction of the observed reduction of heterotrophic respiration (R-h) under sustained warming. The simulations showed how the combined effects of faster turnover and reduced substrate availability lead to a transient increase of R-h. The simulated annual increase in R-h from soil was 60% in the first year after perturbation but decreased to 30% after a decade. One conclusion from the analysis of the simulations is that R-h can decrease even though the temperature response function for decomposition remains unchanged. G'DAY suggests that acclimation of R-h to soil warming is partly an effect of substrate depletion of labile C pools during the first decade of warming as a result of accelerated rates of mineralization. The response is attributed mainly to changing levels of C in pools with short time constants, reflecting the importance of high-quality soil C fractions. Changes of the structure or physiology of the decomposer community were not invoked. Therefore, it becomes a question of definition whether the simulated dynamics of the declining response of CO2 release to the warming should be named acclimation or seen as a natural part of the system dynamics.

KW - acclimation

KW - carbon storage

KW - century

KW - ecosystem model

KW - feedback

KW - g'day

KW - global warming

KW - q(10)

KW - soil respiration

KW - soil warming

KW - carbon-cycle feedbacks

KW - long-term response

KW - organic-matter

KW - norway spruce

KW - elevated co2

KW - temperature-dependence

KW - litter decomposition

KW - modeling analysis

KW - root respiration

KW - atmospheric co2

U2 - 10.1111/j.1365-2486.2004.00878.x

DO - 10.1111/j.1365-2486.2004.00878.x

M3 - Article

VL - 11

SP - 167

EP - 181

JO - Global Change Biology

JF - Global Change Biology

SN - 1354-1013

IS - 1

ER -