2021
DOI: 10.5194/bg-18-1769-2021
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Representing methane emissions from wet tropical forest soils using microbial functional groups constrained by soil diffusivity

Abstract: Abstract. Tropical ecosystems contribute significantly to global emissions of methane (CH4), and landscape topography influences the rate of CH4 emissions from wet tropical forest soils. However, extreme events such as drought can alter normal topographic patterns of emissions. Here we explain the dynamics of CH4 emissions during normal and drought conditions across a catena in the Luquillo Experimental Forest, Puerto Rico. Valley soils served as the major source of CH4 emissions in a normal precipitation year… Show more

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Cited by 4 publications
(2 citation statements)
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References 75 publications
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“…This view stems from the fact that methanogenesis is generally recognized to be a strictly anaerobic process. More recently, methanogenesis in oxygenated soils has been reported to occur in ecosystems ranging from wetlands [11][12][13] to humid tropical forests [15,16,38], where near-surface oxygenated soil can account for up to 90% of total CH 4 emissions from certain wetlands [11]. The mechanisms of this process in soil appear to be unique, at least when compared to CH 4 emissions from oxygenated marine waters where CH 4 can be generated during the aerobic degradation of dissolved organic, methylated, phosphonates [39].…”
Section: Applying Redox Heterogeneity To Disentangle the Soil Ch 4 Paradoxmentioning
confidence: 99%
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“…This view stems from the fact that methanogenesis is generally recognized to be a strictly anaerobic process. More recently, methanogenesis in oxygenated soils has been reported to occur in ecosystems ranging from wetlands [11][12][13] to humid tropical forests [15,16,38], where near-surface oxygenated soil can account for up to 90% of total CH 4 emissions from certain wetlands [11]. The mechanisms of this process in soil appear to be unique, at least when compared to CH 4 emissions from oxygenated marine waters where CH 4 can be generated during the aerobic degradation of dissolved organic, methylated, phosphonates [39].…”
Section: Applying Redox Heterogeneity To Disentangle the Soil Ch 4 Paradoxmentioning
confidence: 99%
“…For example, organic C forms co-precipitated complexes with Fe-(oxyhydr)oxides, where phosphorus (P) also strongly sorbs to Fe-(oxyhydr)oxides, and so Fe(III)-reducing bacteria can significantly impact the coupled C-Fe-P cycle during redox oscillations and dissimilatory Fe(III) reduction [30,41,52,53]. The microbiome of tropical soils has been shown to quickly respond to different redox-oscillating conditions and there are many biogeochemical pathways that may be hypothesized to shift due to climatedriven redox perturbations now and in the immediate future [16,38,46]. For instance, CH 4 production and high methanogenic activity have been observed in tropical soils in the field and when incubated under different levels of headspace O 2 in the laboratory [15,16], which is important because soil aeration in the field is sensitive to the effects of climate change.…”
Section: Climate-driven Redox Perturbations In Soilmentioning
confidence: 99%