Land-Use Change and Biogeochemical Controls of Methane Fluxes in Soils of Eastern Amazonia

Verchot, Louis; Davidson, Eric A.; Cattânio, José Henrique; Ackerman, Ilse L.

doi:10.1007/s100210000009

Cited by 255 publications

(286 citation statements)

References 48 publications

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“…The lack of influence of slope position on CH 4 uptake that we detected supports results from forest sites in Costa Rica where no differences in CH 4 uptake between topographic positions was detected (Reiners et al 1998). Furthermore, we found no evidence that seasonal waterlogging turned net methane-oxidizing tropical forest soils into net CH 4 sources as reported for seasonal lowland rain forests in Brazil (Davidson et al 2004;Verchot et al 2000). Seasonal variation in soil water Fig.…”

Section: Net Exchange Of Ch 4 Under Field Conditionssupporting

confidence: 84%

“…Furthermore, net CH 4 fluxes in soils are the result of CH 4 production and CH 4 oxidation which are regulated by spatial and temporal variability of anaerobic and aerobic microsites in the soil. Anaerobic microsites in upland soils may occur during wet periods or due to consumption of soil oxygen because of high microbial activity (Verchot et al 2000). An enhanced occurrence of anaerobic microsites can turn soils from net sinks for atmospheric CH 4 into net sources (Davidson et al 2004;Keller and Reiners 1994;Keller et al 2005).…”

Section: Introductionmentioning

confidence: 99%

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Atmospheric methane uptake by tropical montane forest soils and the contribution of organic layers

2011

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Microbial oxidation in aerobic soils is the primary biotic sink for atmospheric methane (CH 4 ), a powerful greenhouse gas. Although tropical forest soils are estimated to globally account for about 28% of annual soil CH 4 consumption (6.2 Tg CH 4 year -1 ), limited data are available on CH 4 exchange from tropical montane forests. We present the results of an extensive study on CH 4 exchange from tropical montane forest soils along an elevation gradient (1,000, 2,000, 3,000 m) at different topographic positions (lower slope, mid-slope, ridge position) in southern Ecuador. All soils were net atmospheric CH 4 sinks, with decreasing annual uptake rates from 5.9 kg CH 4 -C ha -1 year -1 at 1,000 m to 0.6 kg CH 4 -C ha -1 year -1 at 3,000 m. Topography had no effect on soil atmospheric CH 4 uptake. We detected some unexpected factors controlling net methane fluxes: positive correlations between CH 4 uptake rates, mineral nitrogen content of the mineral soil and with CO 2 emissions indicated that the largest CH 4 uptake corresponded with favorable conditions for microbial activity. Furthermore, we found indications that CH 4 uptake was N limited instead of inhibited by NH 4 ?. Finally, we showed that in contrast to temperate regions, substantial high affinity methane oxidation occurred in the thick organic layers which can influence the CH 4 budget of these tropical montane forest soils. Inclusion of elevation as a co-variable will improve regional estimates of methane exchange in these tropical montane forests.

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Section: Net Exchange Of Ch 4 Under Field Conditionssupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Atmospheric methane uptake by tropical montane forest soils and the contribution of organic layers

2011

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“…1a, b), as shown by the strong positive correlations with WFPS in all land-use types in both landscapes (Table 3). Such seasonal changes reflect diffusional limitation on the supply of CH 4 to methanotrophs at high WFPS (Keller and Reiners, 1994) and the possible occurrence of anaerobic decomposition, producing CH 4 , which may partially offset CH 4 consumption (Keller and Reiners, 1994;Verchot et al, 2000). Since we measured occasional net CH 4 emissions from some reference land-use types (Fig.…”

Section: Co 2 and Ch 4 Fluxes From The Reference Land-use Typesmentioning

confidence: 99%

“…In the Brazilian Amazon, lowland forests on Acrisol and Ferralsol soils display high soil CO 2 emissions with large variations among sites that relate to soil texture: soils with sandy loam to sandy clay loam texture had 21-36 % higher CO 2 emissions than soils with clay texture (Keller et al, 2005;Sotta et al, 2006). Moreover, although well-drained soils in tropical lowland forests generally act as a sink for CH 4 (Keller and Reiners, 1994;Verchot et al, 2000;Veldkamp et al, 2013), their differences in CH 4 uptake are explicable by their differences in soil texture. In a review of 16 tropical lowland forests, the only factor correlating annual CH 4 fluxes with site characteristics was a significant positive correlation with clay contents, indicating that the higher the clay content the lower the CH 4 uptake (Veldkamp et al, 2013).…”

mentioning

confidence: 99%

Soil fertility controls soil–atmosphere carbon dioxide and methane fluxes in a tropical landscape converted from lowland forest to rubber and oil palm plantations

et al. 2015

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Abstract. Expansion of palm oil and rubber production, for which global demand is increasing, causes rapid deforestation in Sumatra, Indonesia, and is expected to continue in the next decades. Our study aimed to (1) quantify changes in soil CO 2 and CH 4 fluxes with land-use change and (2) determine their controlling factors. In Jambi Province, Sumatra, we selected two landscapes on heavily weathered soils that differ mainly in texture: loam and clay Acrisol soils. In each landscape, we investigated the reference land-use types (forest and secondary forest with regenerating rubber) and the converted land-use types (rubber, 7-17 years old, and oil palm plantations, 9-16 years old). We measured soil CO 2 and CH 4 fluxes monthly from December 2012 to December 2013. Annual soil CO 2 fluxes from the reference land-use types were correlated with soil fertility: low extractable phosphorus (P) coincided with high annual CO 2 fluxes from the loam Acrisol soil that had lower fertility than the clay Acrisol soil (P < 0.05). Soil CO 2 fluxes from the oil palm (107.2 to 115.7 mg C m −2 h −1 ) decreased compared to the other land-use types (between 178.7 and 195.9 mg C m −2 h −1 ; P < 0.01). Across land-use types, annual CO 2 fluxes were positively correlated with soil organic carbon (C) and negatively correlated with 15 N signatures, extractable P and base saturation. This suggests that the reduced soil CO 2 fluxes from oil palm were the result of strongly decomposed soil organic matter and reduced soil C stocks due to reduced litter input as well as being due to a possible reduction in C allocation to roots due to improved soil fertility from liming and P fertilization in these plantations. Soil CH 4 uptake in the reference landuse types was negatively correlated with net nitrogen (N) mineralization and soil mineral N, suggesting N limitation of CH 4 uptake, and positively correlated with exchangeable aluminum (Al), indicating a decrease in methanotrophic activity at high Al saturation. Reduction in soil CH 4 uptake in the converted land-use types (ranging from −3.0 to −14.9 µg C m −2 h −1 ) compared to the reference land-use types (ranging from −20.8 to −40.3 µg C m −2 h −1 ; P < 0.01) was due to a decrease in soil N availability in the converted land-use types. Our study shows for the first time that differences in soil fertility control the soil-atmosphere exchange of CO 2 and CH 4 in a tropical landscape, a mechanism that we were able to detect by conducting this study on the landscape scale.

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“…As everyone appreciates, the common conception of methanogenesis involves strictly anaerobic conditions (e.g., Houghton et al, 2001), however, the controversial notion of aerobic methanogenesis has been reported at least for plants (Keppler et al, 2006). Perhaps more importantly, the presence of anaerobic microsites in soils with overall bulk conditions, or in proximity to aerobic microsites has been documented in a variety of settings (e.g., Verchot et al, 2000;Li et al, 2000). Either of of volcanic volatiles from a nearby volcanic source.…”

Section: Discussionmentioning

confidence: 99%

High-resolution signatures of oxygenation and microbiological activity in speleothem fluid inclusions

Blamey

Boston²,

Rosales-Lagarde³

2016

IJS

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Abstract:Speleothems frequently host "fossil" fluids that were trapped in small inclusions during growth. Such fluids may provide valuable clues to past microbial, geochemical, and climatic processes during their formation. However, one difficulty is to understand which gases represent background atmosphere and fluids within a given cave system at a particular time, and which may be the product of post-trapping residual microbial activity or abiotic chemical reactions? Do we have any hope of sorting out these differences?The success depends on a quantitative understanding of the gas composition trapped in the inclusions and an understanding of the interactions of cave mineralogy, air and water chemistry, and microbiological processes that may interfere with climatic or geochemical interpretations. Our proof-of-concept project uses time synchronous samples from several sites. We report here on this pilot investigation of speleothem inclusions using a methodology for quantitatively analyzing gases dissolved in inclusion fluids. We use incremental crushing of highly spatially resolved samples by mass spectrometry. Here, we report primarily on CH 4 , CO 2 , O 2 , and N 2 , but have included other detectable gases. The detection limit for He within aqueous fluid inclusions is ~0.2 ppm and gas ratios have ~5% precision using natural standards. We used chemically inert argon as a tracer gas to normalize results to air or air-saturated water. This enables interpretation of gas data despite variability in hydrological and geological cave histories. Results are variable. For example, in one case oxygen was depleted while nitrogen was increased, which may be attributable to the breakdown of nitrate or nitrogen-containing biomolecules. In other cases, oxygen is enriched which may be attributed to several factors both geochemical and biological. We suggest potential interpretations between the competing hypotheses with larger future data sets. This first attempt tackles the complex and intertwined speleological questions using the inclusion gas method.fluid inclusions, fluid inclusion gases, microbial activity, speleothems

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Land-Use Change and Biogeochemical Controls of Methane Fluxes in Soils of Eastern Amazonia

Cited by 255 publications

References 48 publications

Atmospheric methane uptake by tropical montane forest soils and the contribution of organic layers

Atmospheric methane uptake by tropical montane forest soils and the contribution of organic layers

Soil fertility controls soil–atmosphere carbon dioxide and methane fluxes in a tropical landscape converted from lowland forest to rubber and oil palm plantations

High-resolution signatures of oxygenation and microbiological activity in speleothem fluid inclusions

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