Temperature dependence of carbon mineralisation: conclusions from a long-term incubation of subalpine soil samples

Reichstein, Markus; Bednorz, Frank; Broll, Gabriele; Kätterer, Thomas

doi:10.1016/s0038-0717(00)00002-x

Cited by 154 publications

(93 citation statements)

References 33 publications

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“…However, this observed transient doubling of respiration rates is just a singularity that disagrees with most of the laboratory observations at low temperatures reported to date (Reichstein et al 2000;Dalias et al 2001;Rey and Jarvis 2006). We nonetheless contend that the response observed in this study cannot be fully compared with previous observations where initial physical and biological conditions of soil were strongly modified by soil mixing, sieving, rewetting and/or oven drying.…”

Section: Discussioncontrasting

confidence: 98%

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Plant-soil interactions and acclimation to temperature of microbial-mediated soil respiration may affect predictions of soil CO2 efflux

Yuste

Baldocchi

2009

Biogeochemistry

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It is well known that microbial-mediated soil respiration, the major source of CO 2 from terrestrial ecosystems, is sensitive to temperature. Here, we hypothesize that some mechanisms, such as acclimation of microbial respiration to temperature and/or regulation by plant fresh C inputs of the temperature sensitivity of decomposition of soil organic matter (SOM), should be taken into account to predict soil respiration correctly. Specifically, two hypotheses were tested: (1) under warm conditions, temperature sensitivity (Q 10 ) and basal rates of microbial-mediated soil respiration (Bs 20, respiration at a given temperature) would be primarily subjected to presence/absence of plant fresh C inputs; and (2) under cold conditions, where labile C depletion occurred more slowly, microbial-mediated soil respiration could adjust its optimal temperatures to colder temperatures (acclimation), resulting in a net increase of respiration rates for a given temperature (Bs 20 ). For this purpose, intact soil cores from an oak savanna ecosystem were incubated with sufficient water supply at two contrasting temperatures (10 and 30°C) during 140 days. To study temperature sensitivity of soil respiration, short-term temperature cycles (from 5 to 40°C at 8 h steps) were applied periodically to the soils. Our results confirmed both hypotheses. Under warm conditions ANCOVA and likelihood ratio tests confirmed that both Q 10 and Bs 20 decreased significantly during the incubation. Further addition of glucose at the end of the incubation period increased Bs 20 and Q 10 to initial values. The observed decrease in temperature sensitivity (Q 10 ) in absence of labile C disagrees with the broadly accepted fact that temperature sensitivity of the process increases as quality of the substrate decreases. Our experiment also shows that after 2 months of incubation cold-incubated soils doubled the rates of respiration at cold temperatures causing a strong increase in basal respiration rates (Bs 20 ). This suggest that microbial community may have up-regulated their metabolism at cold conditions (cold-acclimation), which also disagrees with most observations to date. The manuscript discusses those two apparent contradictions: the decrease in temperature sensitivity in absence of labile C and the increase in microbial-mediated soil respiration rates at cold temperatures. While this is only a case study, the trends observed could open the controversy over the validity of current soil respiration models.

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Section: Discussioncontrasting

confidence: 98%

“…1a), as it has been shown in multiple experiments (e.g. Reichstein et al 2000;Dalias et al 2001). Under warm conditions, microbial-mediated respiration rates decreased exponentially in a very predictable way (Figs.…”

Section: Discussionsupporting

confidence: 76%

Plant-soil interactions and acclimation to temperature of microbial-mediated soil respiration may affect predictions of soil CO2 efflux

Yuste

Baldocchi

2009

Biogeochemistry

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“…decomposition. Both of these trends have been previously observed (Kirschbaum, 1995;Winkler et al, 1996;Reichstein et al, 2000;Conant et al, 2004). The Q 10 -ML ranged from 1.19 to 2.31, which is similar to the influence of temperature on the decomposition of plant litter in several terrestrial ecosystems (Andren and Paustian, 1987;Gholz et al, 2000;Coûteaux et al, 2002).…”

Section: Discussionsupporting

confidence: 83%

Microbial decomposition of skeletal muscle tissue (Ovis aries) in a sandy loam soil at different temperatures

Carter

Tibbett

2006

Soil Biology and Biochemistry

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“…We agree with Knorr et al (2005) that these findings can be more convincingly explained by the intrinsic dynamics of soil carbon pools with substantially different decomposition rates as implemented in most global carbon cycle models (cf. also Reichstein et al, 2000;Kirschbaum, 2004). Hence, the hypothesis of increased soil organic matter decomposition inducing a positive carbon cycle feedback in response to global warming cannot be rejected.…”

Section: Analysis and Discussion Of Results Found By Knorr Et Al (2005)mentioning

confidence: 99%

Temperature sensitivity of decomposition in relation to soil organic matter pools: critique and outlook

Reichstein

Kätterer²,

Andrén³

et al. 2005

Biogeosciences

120

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Abstract. Knorr et al. (2005) concluded that soil organic carbon pools with longer turnover times are more sensitive to temperature. We show that this conclusion is equivocal, largely dependent on their specific selection of data and does not persist when the data set of Kätterer et al. (1998) is analysed in a more appropriate way. Further, we analyse how statistical properties of the model parameters may interfere with correlative analyses that relate the Q 10 of soil respiration with the basal rate, where the latter is taken as a proxy for soil organic matter quality. We demonstrate that negative parameter correlations between Q 10 -values and base respiration rates are statistically expected and not necessarily provide evidence for a higher temperature sensitivity of low quality soil organic matter. Consequently, we propose it is premature to conclude that stable soil carbon is more sensitive to temperature than labile carbon.

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Temperature dependence of carbon mineralisation: conclusions from a long-term incubation of subalpine soil samples

Cited by 154 publications

References 33 publications

Plant-soil interactions and acclimation to temperature of microbial-mediated soil respiration may affect predictions of soil CO2 efflux

Plant-soil interactions and acclimation to temperature of microbial-mediated soil respiration may affect predictions of soil CO2 efflux

Microbial decomposition of skeletal muscle tissue (Ovis aries) in a sandy loam soil at different temperatures

Temperature sensitivity of decomposition in relation to soil organic matter pools: critique and outlook

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