The influence of climate on CO2 and CH4 emissions from organic soils

Chapman, Stephen J.; Thurlow, M. E.

doi:10.1016/0168-1923(95)02283-x

Cited by 65 publications

(38 citation statements)

References 18 publications

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“…Larger Q 10 values were associated with locations with a smaller temperature range, which occur deeper in the profile. All values fell within the considerable range in Q 10 for peatlands reported in the literature, 1.8-6.1 (Svensson 1980;Chapman and Thurlow 1996;Silvola and others 1996a). We conclude that at least some of the variation in Q 10 reported in the literature is likely due to the lack of standardization of the depth at which peat temperature is measured.…”

Section: Discussionsupporting

confidence: 56%

Ecosystem Respiration in a Cool Temperate Bog Depends on Peat Temperature But Not Water Table

et al. 2005

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Ecosystem respiration (ER) is an important but poorly understood part of the carbon (C) budget of peatlands and is controlled primarily by the thermal and hydrologic regimes. To establish the relative importance of these two controls for a large ombrotrophic bog near Ottawa, Canada, we analyzed ER from measurements of nighttime net ecosystem exchange of carbon dioxide (CO 2 ) determined by eddy covariance technique. Measurements were made from May to October over five years, 1998 to 2002. Ecosystem respiration ranged from less than 1 lmol CO 2 m )2 s )1 in spring (May) and fall (late October) to 2-4 lmol CO 2 m )2 s )1 during mid-summer (July-August).As anticipated, there was a strong relationship between ER and peat temperatures (r 2 = 0.62). Q 10 between 5°to 15°C varied from 2.2 to 4.2 depending upon the choice of depth where temperature was measured and location within a hummock or hollow. There was only a weak relationship between ER and water-table depth (r 2 = 0.11). A laboratory incubation of peat cores at different moisture contents showed that CO 2 production was reduced by drying in the surface samples, but there was little decrease in production due to drying from below a depth of 30 cm. We postulate that the weak correlation between ER and water table position in this peatland is primarily a function of the bog being relatively dry, with water table varying between 30 and 75 cm below the hummock tops. The dryness gives rise to a complex ER response to water table involving i) compensations between production of CO 2 in the upper and lower peat profile as the water table falls and ii) the importance of autotrophic respiration, which is relatively independent of water-table position.

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Section: Discussionsupporting

confidence: 56%

Ecosystem Respiration in a Cool Temperate Bog Depends on Peat Temperature But Not Water Table

et al. 2005

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“…The values of R 10 during the growing season fell in the range (1.8-6.1) of the numerous observations in wetlands reported in literatures (Svensson, 1980;Chapman and Thurlow, 1996;Silvola et al, 1996). These values of R 10 were based on seasonal changes in soil temperature, and the dependence on temperature was higher in June than in the other months.…”

Section: Ecosystem Respiration (R Eco )mentioning

confidence: 52%

Seasonal variations in carbon dioxide exchange in an alpine wetland meadow on the Qinghai-Tibetan Plateau

Zhao

et al. 2010

Biogeosciences

104

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Abstract. Alpine wetland meadow could functions as a carbon sink due to it high soil organic content and low decomposition. However, the magnitude and dynamics of carbon stock in alpine wetland ecosystems are not well quantified. Therefore, understanding how environmental variables affect the processes that regulate carbon fluxes in alpine wetland meadow on the Qinghai-Tibetan Plateau is critical. To address this issue, Gross Primary Production (GPP), Ecosystem Respiration (R eco ), and Net Ecosystem Exchange (NEE) were examined in an alpine wetland meadow using the eddy covariance method from October 2003 to December 2006 at the Haibei Research Station of the Chinese Academy of Sciences. Seasonal patterns of GPP and R eco were closely associated with leaf area index (LAI). The R eco showed a positive exponential to soil temperature and relatively low R eco occurred during the non-growing season after a rain event. This result is inconsistent with the result observed in alpine shrubland meadow. In total, annual GPP were estimated at 575.7, 682.9, and 630.97 g C m −2 in 2004, 2005, and 2006, respectively. Meanwhile, the R eco were equal to 676.8, 726.4, 808.2 g C m −2 , and thus the NEE were 101.1, 44.0 and 173.2 g C m −2 . These results indicated that the alpine wetland meadow was a moderately source of carbon dioxide (CO 2 ). The observed carbon dioxide fluxes in the alpine wetland meadow were higher than other alpine meadow such as Kobresia humilis meadow and shrubland meadow.

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“…Many studies documented that main factors impacting soil respiration (R ECO ) and therefore carbon emissions are air temperature (Bubier et al 1998;Bortoluzzi et al 2006;Davidson et al 2006;Heijmans et al 2013) or peat temperature (Chapman and Thurlow 1996;Silvola et al 1996;Lafleur et al 2005;Juszczak et al 2013;D'Angelo et al 2016). Approximate 1°C temperature increase at subarctic peatlands resulted in increases of R ECO values and mobilization of carbon that was located in deeper peat layers (Dorrepaal et al 2009).…”

Section: Additive Effect Of Warming and Lowering Of Wtd On C Cyclingmentioning

confidence: 99%

The Impact of Experimental Temperature and Water Level Manipulation on Carbon Dioxide Release in a Poor Fen in Northern Poland

et al. 2018

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Peatlands are ecosystems for which carbon budget relies strongly on the meteorological and hydrological conditions. Here, using a manipulative field experiment, we measured ecosystem respiration (R ECO ) over two years (2013)(2014) ). With the natural dry period event which occurred in 2014, the seasonal R ECO increased by approx. 0.2 μmol CO 2 m −2 s −1 as compared to the previous year. Projected global warming will therefore significantly enhance C loss from poor fens in this region of Europe.

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The influence of climate on CO2 and CH4 emissions from organic soils

Cited by 65 publications

References 18 publications

Ecosystem Respiration in a Cool Temperate Bog Depends on Peat Temperature But Not Water Table

Ecosystem Respiration in a Cool Temperate Bog Depends on Peat Temperature But Not Water Table

Seasonal variations in carbon dioxide exchange in an alpine wetland meadow on the Qinghai-Tibetan Plateau

The Impact of Experimental Temperature and Water Level Manipulation on Carbon Dioxide Release in a Poor Fen in Northern Poland

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