The Response of CO<sub>2</sub> Evolution from Soils to Global Temperature Changes

Schleser, G.

doi:10.1515/zna-1982-0316

Cited by 89 publications

(62 citation statements)

References 13 publications

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“…Although it is believed that soil carbon emission may be enhanced by the global warming for its temperature effect (Billings et al, 1982;Schleser, 1982;Raich and Schlesinger, 1992;Kirschbaum, 1995), it is possible that the presumed enhancement of soil respiration may be offset by the soil moisture effect as shown in our results. The overall effect can only be adequately evaluated by treating the temperature sensitivity measure as a function of, at least, temperature and moisture.…”

Section: Discussionmentioning

confidence: 63%

“…Numerous studies have sought to establish a relationship of soil respiration rate with soil moisture and temperature (e.g. Schleser, 1982;Lloyd and Taylor, 1994;Thierron and Laudelout, 1996;Davidson et al, 1998;Gulledge and Schimel, 2000;Xu and Qi, 2001a). However, up to date it is still unclear how Q 10 is affected by factors other than temperature (Carlyle and Than, 1988;Simmons et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

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Temperature sensitivity of soil respiration and its effects on ecosystem carbon budget: nonlinearity begets surprises

2002

Ecological Modelling

141

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Nonlinearity is a salient feature in all complex systems, and it certainly characterizes biogeochemical cycles in ecosystems across a wide range of scales. Soil carbon emission is a major source of uncertainty in estimating the terrestrial carbon budget at the ecosystem level and above. Due to the lack of consideration of the nonlinearity in temperature sensitivity of soil respiration, several commonly used ecosystem models produce substantially different estimates of soil respiration with the same or similar model input. In this paper we demonstrated that the response of soil respiration to changes in temperature sensitivity is nonlinear and, thus, that the oversimplified formulations may significantly reduce the accuracy of ecosystem models in predicting carbon fluxes. To alleviate this problem, we have developed a general model of temperature sensitivity of soil respiration that explicitly considers this nonlinearity. The model was supported by our field measurements from a forest ecosystem, and used to assess the uncertainty in estimating the soil CO 2 efflux with several commonly used ecosystem models. Our results indicated that the variations and nonlinearity of the soil respiration-temperature relationship and its dependence on moisture may have important implications for ecosystem carbon modeling at regional and global scales. In other words, 'small causes' may lead to 'large effects' in complex ecosystems in terms of carbon dynamics. In particular, when the variability in temperature sensitivity of soil respiration was incorporated in the several commonly used ecosystem models, the carbon source-sink relationship for terrestrial ecosystems under future global warming scenarios became dramatically different from those reported previously. Thus, we advocate that confidence limits are both necessary and feasible for simulated carbon budget from ecosystem models. Based on field measurements and model simulations, our study provides useful information for computing such confidence limits. In addition, our new model of temperature sensitivity of soil respiration seems more general and yet realistic, and can improve the accuracy of ecosystem models in predicting carbon fluxes at large scales.

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Section: Discussionmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Temperature sensitivity of soil respiration and its effects on ecosystem carbon budget: nonlinearity begets surprises

2002

Ecological Modelling

141

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“…T opt was ®xed at 258C and Q 10 at 2.2 (Cou Ãteaux et al, 2001). The assumption of a constant value of Q 10 could be questionable because it has been shown that Q 10 decreases with temperature (Schleser, 1982;Kirschbaum, 1995; Dalias et al, 2001a,b). Nevertheless, Cou Ãteaux et al (in press) comparing the validity of the response function to temperature using a ®xed Q 10 and a mobile Q 10 , related to daily temperature and based on published data, did not ®nd any improvement in the explanatory value of the response function and suggested that the simplest procedure should be used for calculation.…”

Section: Decomposition Response Function To Climatementioning

confidence: 99%

“…Many studies have shown that soil C mineralisation increases exponentially with increasing temperature (e.g. Schleser, 1982) and a positive feedback is expected between the liberation of soil carbon and the temperature rise. The potential net transfer of CO 2 to the atmosphere depends on the imbalance between the rates of decomposition and net primary production.…”

Section: Introductionmentioning

confidence: 99%

Decomposition of standard plant material along an altitudinal transect (65–3968m) in the tropical Andes

Coûteaux

Sarmiento

Bottner

et al. 2002

Soil Biology and Biochemistry

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“…That could generate a positive feedback to global warming, because CO 2 is an important greenhouse gas [15][16][17]. The likelihood that this particular feedback will emerge has been extensively discussed [18][19][20][21][22][23] but has not been ruled out [24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Temporal Variability of Soil Respiration in Experimental Tree Plantations in Lowland Costa Rica

Raich

2017

Forests

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Abstract:The principal objective of this study was to determine if there is consistent temporal variability in soil respiration from different forest plantations in a lowland tropical rainforest environment. Soil respiration was measured regularly over 2004 to 2010 in replicated plantations of 15-to 20-year-old evergreen tropical trees in lowland Costa Rica. Statistically significant but small differences in soil respiration were observed among hours of the day; daytime measurements were suitable for determining mean fluxes in this study. Fluxes varied more substantially among months, with the highest average emissions (5.9 µmol·m −2 ·s −1 ) occurring in September and low emissions (3.7 µmol·m −2 ·s −1 ) occurring in January. Three of the six tree species had significantly increasing rates of soil respiration across 2004-2010, with fluxes increasing at an average of 0.09 µmol·m −2 ·s −1 per year: the three other species had no long-term trends. It was hypothesized that there would be a tradeoff between carbon allocation aboveground, to produce new leaves, and belowground, to sustain roots and mycorrhizae, but the relationship between canopy leaf fall-a surrogate for canopy leaf flushing-and soil respiration was significantly positive. The similarities observed among temporal trends across plantation types, and significant relationships between soil respiration, soil water content and soil temperature, suggest that the physical environment largely controlled the temporal variability of soil respiration, but differences in flux magnitude among tree species were substantial and consistent across years.

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The Response of CO₂ Evolution from Soils to Global Temperature Changes

Cited by 89 publications

References 13 publications

Temperature sensitivity of soil respiration and its effects on ecosystem carbon budget: nonlinearity begets surprises

Temperature sensitivity of soil respiration and its effects on ecosystem carbon budget: nonlinearity begets surprises

Decomposition of standard plant material along an altitudinal transect (65–3968m) in the tropical Andes

Temporal Variability of Soil Respiration in Experimental Tree Plantations in Lowland Costa Rica

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The Response of CO2 Evolution from Soils to Global Temperature Changes

Cited by 89 publications

References 13 publications

Temperature sensitivity of soil respiration and its effects on ecosystem carbon budget: nonlinearity begets surprises

Temperature sensitivity of soil respiration and its effects on ecosystem carbon budget: nonlinearity begets surprises

Decomposition of standard plant material along an altitudinal transect (65–3968m) in the tropical Andes

Temporal Variability of Soil Respiration in Experimental Tree Plantations in Lowland Costa Rica

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The Response of CO₂ Evolution from Soils to Global Temperature Changes