Temperature response of soil respiration largely unaltered with experimental warming

Carey, Joanna C.; Tang, Jianwu; Templer, Pamela H.; Kroeger, Kevin D.; Crowther, Thomas W.; Burton, Andrew J.; Dukes, Jeffrey S.; Emmett, Bridget A.; Frey, Serita D.; Heskel, Mary A.; Jiang, Lifen; Machmuller, Megan B.; Mohan, Jacqueline E.; Panetta, Anne Marie; Reich, Peter B.; Reinsch, Sabine; Wang, Xin; Allison, Steven D.; Bamminger, Chris; Bridgham, Scott D.; Collins, Scott L.; Dato, Giovanbattista de; Eddy, William C.; Enquist, Brian J.; Estiarte, Marc; Harte, John; Henderson, Amanda; Johnson, Bart R.; Larsen, Klaus Steenberg; Luo, Yiqi; Marhan, Sven; Melillo, Jerry M.; Peñuelas, Josep; Pfeifer‐Meister, Laurel; Poll, Christian; Rastetter, Edward B.; Reinmann, Andrew B.; Reynolds, Lorien L.; Schmidt, Inger Kappel; Shaver, Gaius R.; Strong, Aaron; Suseela, Vidya; Tietema, Albert

doi:10.1073/pnas.1605365113

Cited by 344 publications

(301 citation statements)

References 45 publications

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“…A similarly Gaussian (bell‐shape) pattern in the Rs response across the T soil ranges is visible, which corroborates with the findings of Carey et al () and Portner et al (). Figure shows that below ~18 °C, Rs increases to nearly ~1.8 μmol CO 2 /m 2 s and by exceeding ~18 °C, Rs decreases to ~1 μmol CO 2 /m 2 s. Beyond ~27 °C, Rs remains nearly unchanged with increasing T soil.…”

Section: Resultssupporting

confidence: 90%

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Analyzing High‐Frequency Soil Respiration Using a Probabilistic Model in a Semiarid, Mediterranean Climate

et al. 2019

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High‐frequency (subhourly) changes in soil respiration (Rs), a critical component of the carbon cycle, are not well documented in semiarid ecosystems. We investigate the response of Rs to subhourly soil temperature (Tsoil) and soil volumetric water content (VWC) variation in a semiarid ecosystem across a year of highly variable weather. We propose a probabilistic model to estimate the likelihood of Rs exceeding its annual mean (1.2 μmol CO2/m2s), conditioned on different Tsoil and VWC values. The results show that Rs follows a Gaussian‐like pattern as Tsoil increases, where it follows an upward trend until ~18 °C, and then begins to decline. Rs remains constant at Tsoil beyond ~27 °C. Using our novel conditional probability model, we show both the increasing and decreasing response of Rs to rising Tsoil through two ranges (14–17 and 20–23 °C) where Rs observations show opposing responses. We demonstrate that an increase in Tsoil from 14 to 17 °C causes a rise in Rs by a factor of 1.4 relative to the mean. The proposed model also describes how Rs reduces as Tsoil continues to increase above ~18 °C. Considering VWC and Tsoil into the proposed model, we show that when Tsoil is low (e.g., 17 °C), a rise in VWC yields a decrease of Rs by a factor of 3.6. However, when Tsoil is high (e.g., 23 °C), Rs increases with increasing VWC by a factor of 2.5. Overall, the probabilistic model enables us to detect and characterize changes in Rs distribution in response to different environmental variables and thresholds.

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Section: Resultssupporting

confidence: 90%

“…To describe the relationship between Rs ‐ T soil and Rs ‐VWC in Figures a and b, we use a log‐quadratic T soil (VWC) response function, which is a Gaussian‐type model (Carey et al, ; Heskel et al, ; Lellei‐Kovács et al, ).

ln ((), Rs) = a X^{2} + italicbX + c

…”

Section: Resultsmentioning

confidence: 99%

Analyzing High‐Frequency Soil Respiration Using a Probabilistic Model in a Semiarid, Mediterranean Climate

et al. 2019

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“…This difference was attributable to the concurrent reversed sign of the correlation SR-SWC, confirming the stronger role of SWC than the solely temperature in regulating SR in dry ecosystems subjected to drought. These results are in line with the most recent outcomes on SR modelling in ecosystems facing drought, pointing to include soil moisture, inversely related to soil temperature [53][54][55].…”

Section: Discussionsupporting

confidence: 90%

The Response of Soil CO2 Efflux to Water Limitation Is Not Merely a Climatic Issue: The Role of Substrate Availability

Dato¹,

Lagomarsino²,

Lellei‐Kovács

et al. 2017

Forests

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Abstract:Water availability, together with temperature, represents the most limiting abiotic factor regulating soil CO 2 efflux (SR). Besides the direct effect of water limitation, drought also influences plant activity, determining changes in the quality and quantity of root exudates, thus indirectly affecting soil microbial activity. To determine how the seasonal changes of plant activity and soil microbial metabolism and structure affect SR response to drought, we investigated the correlation between leaf gas exchange, soil carbon pools and soil respiration sources and the role of soil carbon pools on microbial populations and soil respiration, in a summer deciduous Mediterranean (SDS) and a winter deciduous temperate (WDS) shrublands, experiencing a dry summer period. In both sites, drought reduced photosynthesis, but affected SR differently: in SDS, SR decreased, although microbial heterotrophic respiration (SR h ) remained unchanged; in WDS, SR did not vary but SR h was reduced. While in SDS the microbial community was able to respire more complex substrates, in WDS it was strongly dependent on easily decomposable molecules, thus on plant activity. Therefore, the response of soil CO 2 efflux to water limitation is not exclusively influenced by climate as it is modulated by the degree of adaptation of the microbial community to drought.

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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]. As a result, despite decades of discussion and debate, the question persists.…”

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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Temperature response of soil respiration largely unaltered with experimental warming

Cited by 344 publications

References 45 publications

Analyzing High‐Frequency Soil Respiration Using a Probabilistic Model in a Semiarid, Mediterranean Climate

Analyzing High‐Frequency Soil Respiration Using a Probabilistic Model in a Semiarid, Mediterranean Climate

The Response of Soil CO2 Efflux to Water Limitation Is Not Merely a Climatic Issue: The Role of Substrate Availability

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

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