The carbon balance of North American wetlands

Bridgham, Scott D.; Megonigal, J. Patrick; Keller, Jason K.; Bliss, Norman B.; Trettin, Carl C.

doi:10.1672/0277-5212(2006)26[889:tcbona]2.0.co;2

Cited by 767 publications

(569 citation statements)

References 115 publications

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“…In general, the results of CH 4 emission reduction followed by methane consumption fully agree with those of other studies that evaluated the effect of lowering the water-table level by draining in flooded soils in several parts of the world Nykanen et al, 1995;Maljanen et al, 2004;von Arnold et al, 2005;Furukawa et al, 2005;Bridgham et al, 2006;Elder & Lal, 2008;Jauhiainen et al, 2008;Jiang et al, 2009;Huang et al, 2010;Page & Dalal, 2011). All these authors showed that small water-table decreases cause drastic reductions in methane emissions, demonstrating the strong effect of drainage on CH 4 fluxes.…”

Section: In Drained Histosolssupporting

confidence: 87%

Methane fluxes from waterlogged and drained Histosols of highland areas

Rachwal

Zanatta

Dieckow

et al. 2014

Rev. Bras. Ciênc. Solo

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SUMMARYSoil can be either source or sink of methane (CH 4 ), depending on the balance between methanogenesis and methanotrophy, which are determined by pedological, climatic and management factors. The objective of this study was to assess the impact of drainage of a highland Haplic Histosol on CH 4 fluxes. Field research was carried out in Ponta Grossa (Paraná, Brazil) based on the measurement of CH 4 fluxes by the static chamber method in natural and drained Histosol, over one year (17 sampling events). The natural Histosol showed net CH 4 eflux, with rates varying from 238 µg m -2 h -1 CH 4 , in cool/cold periods, to 2,850 µg m -2 h -1 CH 4 , in warm/hot periods, resulting a cumulative emission of 116 kg ha -1 yr -1 CH 4 . In the opposite, the drained Histosol showed net influx of CH 4 (-39 to -146 µg m -2 h -1 ), which resulted in a net consumption of 9 kg ha -1 yr -1 CH 4 . The main driving factors of CH 4 consumption in the drained soil were the lowering of the water-table (on average -57 cm, vs -7 cm in natural soil) and the lower water content in the 0-10 cm layer (average of 5.5 kg kg -1 , vs 9.9 kg kg -1 in natural soil). Although waterlogged Histosols of highland areas are regarded as CH 4 sources, they fulfill fundamental functions in the ecosystem, such as the accumulation of organic carbon (581 Mg ha -1 C to a depth of 1 m) and water (8.6 million L ha -1 = 860 mm to a depth of 1 m). For this reason, these soils must not be drained as an alternative to mitigate CH 4 emission, but effectively preserved.Index terms: greenhouse gas, water sources, water-table, gravimetric moisture, air temperature, rainfall.(1) Part of the thesis submitted by the first author to obtain a doctorate in Forestry Science, sub-area Nature Conservation. RESUMO: FLUXOS DE METANO EM ORGANOSSOLO NATURAL E APÓS DRENAGEMO solo pode atuar como fonte ou sumidouro de metano (CH 4 ), dependendo do balanço entre metanogênese e metanotrofia, definido por fatores pedológicos, climáticos e de manejo. O objetivo deste estudo foi avaliar as implicações da drenagem do Organossolo Háplico hêmico, típico em campo hidrófilo de altitude sobre os fluxos de CH 4 . A pesquisa de campo foi conduzida no município de Ponta Grossa, PR, e envolveu avaliações de fluxos de CH 4 pelo método da câmara estática em Organossolo natural e Organossolo drenado, por um período de um ano (17 coletas). No Organossolo natural, ocorreu efluxo líquido de CH 4 , com taxas variando entre 238 µg m -2 h -1 de CH 4 , em épocas mais frias, e 2.850 µg m -2 h -1 de CH 4 , em épocas mais quentes, totalizando emissão acumulada de 116 kg ha -1 ano -1 de CH 4 . Na área drenada, ocorreu influxo líquido (-39 a -146 µg m -2 h -1 de CH 4 ), que totalizou em consumo de 9 kg ha -1 ano -1 de CH 4 . O rebaixamento do nível freático (em média -57 cm, contra -7 cm no solo natural) e a menor umidade gravimétrica na camada de 0-10 cm (média de 5,5 kg kg -1 , contra 9,9 kg kg -1 do solo natural) foram os principais fatores determinantes do consumo de CH 4, na área drenada. Apesar de os Organ...

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Section: In Drained Histosolssupporting

confidence: 87%

Methane fluxes from waterlogged and drained Histosols of highland areas

Rachwal

Zanatta

Dieckow

et al. 2014

Rev. Bras. Ciênc. Solo

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“…In contrast, anaerobic decomposition in inundated wetland soils requires many interdependent microbial processes and can generate both CO 2 and methane (CH 4 ) as end products of mineralization (Megonigal et al, 2004). Anaerobic decomposition is less thermodynamically favorable than aerobic decomposition, and this limitation has resulted in the storage of w500 Pg of carbon (19% of the terrestrial soil carbon pool) in wetland soils worldwide (Bridgham et al, 2006). Further, wetlands are currently responsible for between 15% and 40% of the global CH 4 flux (Denman et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Humic acids as electron acceptors in wetland decomposition

Keller

Weisenhorn

Megonigal

2009

Soil Biology and Biochemistry

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154

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“…Human interference may cause changes in the carbon pattern, such as an increase in greenhouse gas emissions. In the last few centuries, the carbon from peatland emitted into the atmosphere has reached 160-250 Tg/a because of drainage or cultivation [14]. This is roughly equivalent to 1.8%-2.8% of the 9 Pg [15], which is estimated to be the carbon emissions caused by human fossil fuel burning in 2010.…”

mentioning

confidence: 99%