Contrasted effects of simulated drought on the production and oxidation of methane in a mid-Wales wetland

C. Freeman; G. B. Nevison; H. Kang; S. Hughes; B. Reynolds; J. A. Hudson

doi:10.1016/S0038-0717(01)00154-7

Contrasted effects of simulated drought on the production and oxidation of methane in a mid-Wales wetland

C. Freeman, G. B. Nevison, H. Kang, S. Hughes, B. Reynolds, J. A. Hudson

Department of Civil and Environmental Engineering

Research output: Contribution to journal › Article › peer-review

62 Citations (Scopus)

Abstract

Wetlands are a major contributor to the global CH₄ budget. Currently, there is a consensus view that drought restrains CH₄ emissions from wetlands, and that this arises due to a suppression of CH₄ production and stimulation of CH₄ oxidation under the more aerobic conditions that accompany lower water table levels. Our data confirm that under drought conditions, CH₄ production is lower (-73%, P < 0.05) largely because it is confined to the deeper, more anaerobic, depths. Lower production rates were found to persist at least 1 month beyond the end of the drought (-89%, P < 0.01). However, we found no evidence of increased rates of CH₄ oxidation during the drought, and in contrast, at the end of the simulation observed significantly less CH₄ oxidation in the drought treated system (P < 0.05). These findings suggest that under drought conditions, the regulation of wetland methane flux occurs primarily through changes in methane production, with methane oxidation playing only a secondary role.

Original language	English
Pages (from-to)	61-67
Number of pages	7
Journal	Soil Biology and Biochemistry
Volume	34
Issue number	1
DOIs	https://doi.org/10.1016/S0038-0717(01)00154-7
Publication status	Published - 2002

Bibliographical note

Funding Information:
This work was funded by the Welsh Office (National Assembly for Wales) and the Natural Environment Research Council. We thank P. Hill and A. Hughes for fieldwork support. Chris Freeman is supported through a Royal Society University Research Fellowship.

All Science Journal Classification (ASJC) codes

Microbiology
Soil Science

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title = "Contrasted effects of simulated drought on the production and oxidation of methane in a mid-Wales wetland",

abstract = "Wetlands are a major contributor to the global CH4 budget. Currently, there is a consensus view that drought restrains CH4 emissions from wetlands, and that this arises due to a suppression of CH4 production and stimulation of CH4 oxidation under the more aerobic conditions that accompany lower water table levels. Our data confirm that under drought conditions, CH4 production is lower (-73%, P < 0.05) largely because it is confined to the deeper, more anaerobic, depths. Lower production rates were found to persist at least 1 month beyond the end of the drought (-89%, P < 0.01). However, we found no evidence of increased rates of CH4 oxidation during the drought, and in contrast, at the end of the simulation observed significantly less CH4 oxidation in the drought treated system (P < 0.05). These findings suggest that under drought conditions, the regulation of wetland methane flux occurs primarily through changes in methane production, with methane oxidation playing only a secondary role.",

author = "C. Freeman and Nevison, {G. B.} and H. Kang and S. Hughes and B. Reynolds and Hudson, {J. A.}",

note = "Funding Information: This work was funded by the Welsh Office (National Assembly for Wales) and the Natural Environment Research Council. We thank P. Hill and A. Hughes for fieldwork support. Chris Freeman is supported through a Royal Society University Research Fellowship.",

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AU - Freeman, C.

AU - Nevison, G. B.

AU - Kang, H.

AU - Hughes, S.

AU - Reynolds, B.

AU - Hudson, J. A.

N1 - Funding Information: This work was funded by the Welsh Office (National Assembly for Wales) and the Natural Environment Research Council. We thank P. Hill and A. Hughes for fieldwork support. Chris Freeman is supported through a Royal Society University Research Fellowship.

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N2 - Wetlands are a major contributor to the global CH4 budget. Currently, there is a consensus view that drought restrains CH4 emissions from wetlands, and that this arises due to a suppression of CH4 production and stimulation of CH4 oxidation under the more aerobic conditions that accompany lower water table levels. Our data confirm that under drought conditions, CH4 production is lower (-73%, P < 0.05) largely because it is confined to the deeper, more anaerobic, depths. Lower production rates were found to persist at least 1 month beyond the end of the drought (-89%, P < 0.01). However, we found no evidence of increased rates of CH4 oxidation during the drought, and in contrast, at the end of the simulation observed significantly less CH4 oxidation in the drought treated system (P < 0.05). These findings suggest that under drought conditions, the regulation of wetland methane flux occurs primarily through changes in methane production, with methane oxidation playing only a secondary role.

AB - Wetlands are a major contributor to the global CH4 budget. Currently, there is a consensus view that drought restrains CH4 emissions from wetlands, and that this arises due to a suppression of CH4 production and stimulation of CH4 oxidation under the more aerobic conditions that accompany lower water table levels. Our data confirm that under drought conditions, CH4 production is lower (-73%, P < 0.05) largely because it is confined to the deeper, more anaerobic, depths. Lower production rates were found to persist at least 1 month beyond the end of the drought (-89%, P < 0.01). However, we found no evidence of increased rates of CH4 oxidation during the drought, and in contrast, at the end of the simulation observed significantly less CH4 oxidation in the drought treated system (P < 0.05). These findings suggest that under drought conditions, the regulation of wetland methane flux occurs primarily through changes in methane production, with methane oxidation playing only a secondary role.

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Contrasted effects of simulated drought on the production and oxidation of methane in a mid-Wales wetland

Abstract

Bibliographical note

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