Moisture and temperature sensitivity of CH4 oxidation in boreal soils

Whalen, Stephen C.; Reeburgh, William S.

doi:10.1016/s0038-0717(96)00139-3

Cited by 182 publications

(117 citation statements)

References 49 publications

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“…The high positive correlation between CH 4 fluxes and temperature is consistent with laboratory studies [e.g., Whalen and Reeburgh, 1996] and field observations [e.g., Bellisario et al, 1999;Christensen et al, 2003]. The correlation between the depth of the water table and CH 4 fluxes accords with field experiments [Heikkinen et al, 2002;Nykänen et al, 1998], suggesting that an inverse relationship exists between water table position and CH 4 fluxes (deeper water tables lead to smaller emissions).…”

Section: Discussionsupporting

confidence: 86%

Estimating wetland methane emissions from the northern high latitudes from 1990 to 2009 using artificial neural networks

Zhu

Zhuang

Qin

et al. 2013

Global Biogeochemical Cycles

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[1] Methane (CH 4 ) emissions from wetland ecosystems in nothern high latitudes provide a potentially positive feedback to global climate warming. Large uncertainties still remain in estimating wetland CH 4 emisions at regional scales. Here we develop a statistical model of CH 4 emissions using an artificial neural network (ANN) approach and field observations of CH 4 fluxes. Six explanatory variables (air temperature, precipitation, water table depth, soil organic carbon, soil total porosity, and soil pH) are included in the development of ANN models, which are then extrapolated to the northern high latitudes to estimate monthly CH 4 emissions from 1990 to 2009. We estimate that the annual wetland CH 4 source from the northern high latitudes (north of 45 N) is 48.7 Tg CH 4 yr À1 (1 Tg = 10 12 g) with an uncertainty range of 44.0~53.7 Tg CH 4 yr À1 . The estimated wetland CH 4 emissions show a large spatial variability over the northern high latitudes, due to variations in hydrology, climate, and soil conditions. Significant interannual and seasonal variations of wetland CH 4 emissions exist in the past 2 decades, and the emissions in this period are most sensitive to variations in water table position. To improve future assessment of wetland CH 4 dynamics in this region, research priorities should be directed to better characterizing hydrological processes of wetlands, including temporal dynamics of water table position and spatial dynamics of wetland areas.Citation: Zhu, X., Q. Zhuang, Z. Qin, M. Glagolev, and L. Song (2013), Estimating wetland methane emissions from the northern high latitudes from 1990 to 2009 using artificial neural networks, Global Biogeochem. Cycles, 27, 592-604,

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Section: Discussionsupporting

confidence: 86%

Estimating wetland methane emissions from the northern high latitudes from 1990 to 2009 using artificial neural networks

Zhu

Zhuang

Qin

et al. 2013

Global Biogeochemical Cycles

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“…Thus, lower water saturation not only increased the CH 4 oxidation rate, presumably by promoting the availability of O 2 and CH 4 to atmMOB, but also allowed atmMOB to be more responsive to temperature change. A similar interactive effect of water saturation and temperature on atm CH 4 oxidation was observed in boreal forest soils (Whalen and Reeburgh, 1996). High Q 10 values were also estimated for CH 4 oxidation in Siberian cryosols at elevated CH 4 concentrations (Figure 3), suggesting that under some conditions thermal sensitivity of CH 4 oxidation is as high as that reported for methanogenesis, which exhibits Q 10 values of 0.6-12, in some boreal and temperate wetlands (Whalen, 2005).…”

Section: Polygon Interiorsupporting

confidence: 66%

An active atmospheric methane sink in high Arctic mineral cryosols

et al. 2015

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Methane (CH 4 ) emission by carbon-rich cryosols at the high latitudes in Northern Hemisphere has been studied extensively. In contrast, data on the CH 4 emission potential of carbon-poor cryosols is limited, despite their spatial predominance. This work employs CH 4 flux measurements in the field and under laboratory conditions to show that the mineral cryosols at Axel Heiberg Island in the Canadian high Arctic consistently consume atmospheric CH 4 . Omics analyses present the first molecular evidence of active atmospheric CH 4 -oxidizing bacteria (atmMOB) in permafrost-affected cryosols, with the prevalent atmMOB genotype in our acidic mineral cryosols being closely related to Upland Soil Cluster α. The atmospheric (atm) CH 4 uptake at the study site increases with ground temperature between 0°C and 18°C. Consequently, the atm CH 4 sink strength is predicted to increase by a factor of 5-30 as the Arctic warms by 5-15°C over a century. We demonstrate that acidic mineral cryosols are a previously unrecognized potential of CH 4 sink that requires further investigation to determine its potential impact on larger scales. This study also calls attention to the poleward distribution of atmMOB, as well as to the potential influence of microbial atm CH 4 oxidation, in the context of regional CH 4 flux models and global warming.

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“…A threshold of < 20 % soil moisture is applied because that value corresponds to optimum conditions for CH 4 oxidation in soil (Castro et al, 1995;Whalen and Reeburgh, 1996) and because inclusion of a water stress parameter better captures CH 4 uptake flux in dry ecosystems (Fig. 3;Curry, 2007).…”

Section: Soil Moisture Factor R Smmentioning

confidence: 99%

Soil Methanotrophy Model (MeMo v1.0): a process-based model to quantify global uptake of atmospheric methane by soil

et al. 2018

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Abstract. Soil bacteria known as methanotrophs are the sole biological sink for atmospheric methane (CH 4 ), a potent greenhouse gas that is responsible for ∼ 20 % of the humandriven increase in radiative forcing since pre-industrial times. Soil methanotrophy is controlled by a plethora of factors, including temperature, soil texture, moisture and nitrogen content, resulting in spatially and temporally heterogeneous rates of soil methanotrophy. As a consequence, the exact magnitude of the global soil sink, as well as its temporal and spatial variability, remains poorly constrained. We developed a process-based model (Methanotrophy Model; MeMo v1.0) to simulate and quantify the uptake of atmospheric CH 4 by soils at the global scale. MeMo builds on previous models by Ridgwell et al. (1999) and Curry (2007) by introducing several advances, including (1) a general analytical solution of the one-dimensional diffusion-reaction equation in porous media, (2) a refined representation of nitrogen inhibition on soil methanotrophy, (3) updated factors governing the influence of soil moisture and temperature on CH 4 oxidation rates and (4) the ability to evaluate the impact of autochthonous soil CH 4 sources on uptake of atmospheric CH 4 . We show that the improved structural and parametric representation of key drivers of soil methanotrophy in MeMo results in a better fit to observational data. A global simulation of soil methanotrophy for the period 1990-2009 using MeMo yielded an average annual sink of 33.5 ± 0.6 Tg CH 4 yr −1 . Warm and semi-arid regions (tropical deciduous forest and open shrubland) had the highest CH 4 uptake rates of 602 and 518 mg CH 4 m −2 yr −1 , respectively. In these regions, favourable annual soil moisture content (∼ 20 % saturation) and low seasonal temperature variations (variations < ∼ 6 • C) provided optimal conditions for soil methanotrophy and soil-atmosphere gas exchange. In contrast to previous model analyses, but in agreement with recent observational data, MeMo predicted low fluxes in wet tropical regions because of refinements in formulation of the influence of excess soil moisture on methanotrophy. Tundra and mixed forest had the lowest simulated CH 4 uptake rates of 176 and 182 mg CH 4 m −2 yr −1 , respectively, due to their marked seasonality driven by temperature. Global soil uptake of atmospheric CH 4 was decreased by 4 % by the effect of nitrogen inputs to the system; however, the direct addition of fertilizers attenuated the flux by 72 % in regions with high agricultural intensity (i.e. China, India and Europe) and by 4-10 % in agriculture areas receiving low rates of N input (e.g. South America). Globally, nitrogen inputs reduced soil uptake of atmospheric CH 4 by 1.38 Tg yr −1 , which is 2-5 times smaller than reported previously. In addition to improved characterization of the contemporary soil sink for atmospheric CH 4 , MeMo provides an opportunity to quantify more accurately the relative importance of soil methanotrophy in the global CH 4 cycle in the past and its capaci...

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Moisture and temperature sensitivity of CH4 oxidation in boreal soils

Cited by 182 publications

References 49 publications

Estimating wetland methane emissions from the northern high latitudes from 1990 to 2009 using artificial neural networks

Estimating wetland methane emissions from the northern high latitudes from 1990 to 2009 using artificial neural networks

An active atmospheric methane sink in high Arctic mineral cryosols

Soil Methanotrophy Model (MeMo v1.0): a process-based model to quantify global uptake of atmospheric methane by soil

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