Methanotrophic activities in tropical landfill cover soils: effects of temperature, moisture content and methane concentration

Visvanathan, C.; Pokhrel, Dinesh; Cheimchaisri, Wilai; Hettiaratchi, J. Patrick A.; Wu, Jy S.

doi:10.1034/j.1399-3070.1999.00052.x

Cited by 43 publications

(72 citation statements)

References 16 publications

(32 reference statements)

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“…Both low and high soil moisture levels can negatively impact soil uptake of atmospheric CH 4 (Schnell and King, 1996;von Fischer et al, 2009). Scarcity of soil water generally inhibits soil microbial activity while excessive moisture attenuates gas diffusion, limiting entry of atmospheric CH 4 and O 2 into soil (Burke et al, 1999;McLain et al, 2002;McLain and Ahmann, 2007;West et al, 1999).…”

Section: Soil Moisture Factor R Smmentioning

confidence: 99%

“…16) to account for decreased gas diffusion and limitation of k d at high soil moisture content. However, attenuation of gas diffusion is only one impact of high soil water content and it is necessary also to account for the inhibitory effects of excessive moisture on k d (Boeckx and Van Cleemput, 1996;van den Pol-van Dasselaar et al, 1998; Visvanathan et al, 1999). Soil moisture content > 20 % reduces CH 4 uptake due to a restricted diffusion of CH 4 and supply of O 2 .…”

Section: Soil Moisture Factor R Smmentioning

confidence: 99%

“…The R99 and C07 models assume that microbial CH 4 oxidation remains active at a soil moisture content of 80 %, an assumption that contradicts field investigations, which show that CH 4 uptake decreases rapidly at soil moisture levels > 50 % (van den Pol-van Dasselaar et al, 1998). Thus, the soil moisture factor employed in MeMo also accounts for limitation of microbial CH 4 oxidation at a soil moisture content > 20 % after which rates of CH 4 uptake begin to decrease (Adamsen and King, 1993;Visvanathan et al, 1999). The r SM factor used in MeMo was determined by fitting a Gaussian function to laboratory experimental data (Table 4, Eq.…”

Section: Soil Moisture Factor R Smmentioning

confidence: 99%

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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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Section: Soil Moisture Factor R Smmentioning

confidence: 99%

Section: Soil Moisture Factor R Smmentioning

confidence: 99%

Section: Soil Moisture Factor R Smmentioning

confidence: 99%

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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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“…The CH 4 oxidation capacity of landfill cover soils varies within and among landfills due to many factors that affect the oxidation process, such as seasonal variations (Abushammala et al, 2013b;Einola et al, 2007;Maurice and Lagerkvist, 2003;Börjesson et al, 2001), physical and chemical heterogeneities of landfill cover soils (Tecle et al, 2008;Albanna et al, 2007;Visvanathan et al, 1999), and the CH 4 concentrations in landfills (Boeckx et al, 1996). According to Mosier et al (2004), the major factors controlling CH 4 oxidation are potential biological demand and diffusion.…”

Section: Factors Affecting Methane Oxidationmentioning

confidence: 99%

“…The CH 4 oxidation rate increases with increasing soil organic content (Humer and Lechner, 2001;Christophersen et al, 2000;Visvanathan et al, 1999 soil incubation tests, Christophersen et al (2000) found that soils containing more organic matter more effectively mitigate CH 4 emissions through oxidation. They also found a relationship between the optimal soil moisture content and the organic matter content.…”

Section: Soil Organic Contentmentioning

confidence: 99%

Methane Oxidation in Landfill Cover Soils: A Review

Abushammala¹,

Basri²,

Irwan³

et al. 2014

Asian J. Atmos. Environ

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Migration of methane (CH 4 ) gas from landfills to the surrounding environment negatively affects both humankind and the environment. It is therefore essential to develop management techniques to reduce CH 4 emissions from landfills to minimize global warming and to reduce the human risks associated with CH 4 gas migration. Oxidation of CH 4 in landfill cover soil is the most important strategy for CH 4 emissions mitigation. CH 4 oxidation occurs naturally in landfill cover soils due to the abundance of methanotrophic bacteria. However, the activities of these bacteria are influenced by several controlling factors. This study attempts to review the important issues associated with the CH 4 oxidation process in landfill cover soils. The CH 4 oxidation process is highly sensitive to environmental factors and cover soil properties. The comparison of various biotic system techniques indicated that each technique has unique advantages and disadvantages, and the choice of the best technique for a specific application depends on economic constraints, treatment efficiency and landfill operations.

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Effect of leachate irrigation on methane oxidation in tropical landfill cover soil

Chiemchaisri

Chittanukul

et al. 2010

J Mater Cycles Waste Manag

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The effect of leachate irrigation on methanotrophic activity in sandy loam-based landfi ll cover soil with vegetation was investigated. Laboratory-scale experiments were conducted to investigate the methane oxidation reaction in cover soil with and without plants (tropical grass). The methane oxidation rate in soil columns was monitored during leachate application at different organic concentrations and using different irrigation patterns. The results showed that the growth of plants on the fi nal cover layer of landfi ll was promoted when optimal supplement nutrients were provided through leachate irrigation. The vegetation also helped to promote methane oxidation in soil, whereas leachate application helped increase the methane oxidation rate in nonvegetated cover soil. Intermittent application of leachate (once every 4 days) improved the methane oxidation activity as compared to daily application. Nevertheless, the adverse effects of organic overloading on methane oxidation rate and plant growth were also observed.

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Methanotrophic activities in tropical landfill cover soils: effects of temperature, moisture content and methane concentration

Cited by 43 publications

References 16 publications

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

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

Methane Oxidation in Landfill Cover Soils: A Review

Effect of leachate irrigation on methane oxidation in tropical landfill cover soil

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