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Agricultural peatland restoration: effects of land‐use change on greenhouse gas (CO2 and CH4) fluxes in the Sacramento‐San Joaquin Delta

Knox, Sara Helen ; Sturtevant, Cove ; Matthes, Jaclyn Hatala ; Koteen, Laurie ; Verfaillie, Joseph ; Baldocchi, Dennis

Global change biology, 2015-02, Vol.21 (2), p.750-765 [Periódico revisado por pares]

England: Blackwell Science

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Agricultural peatland restoration: effects of land‐use change on greenhouse gas (CO2 and CH4) fluxes in the Sacramento‐San Joaquin Delta
Autor: Knox, Sara Helen ; Sturtevant, Cove ; Matthes, Jaclyn Hatala ; Koteen, Laurie ; Verfaillie, Joseph ; Baldocchi, Dennis
Assuntos: Agriculture ; Air Pollutants - analysis ; California ; carbon ; Carbon Cycle ; carbon dioxide ; Carbon Dioxide - analysis ; carbon flux ; Climate change ; Conservation of Natural Resources ; corn ; drainage ; drained ; ecosystem respiration ; eddy covariance ; Environmental Monitoring ; Environmental restoration ; flooded conditions ; greenhouse gas balance ; greenhouse gas emissions ; Greenhouse gases ; humans ; land restoration ; Land use ; land use change ; methane ; Methane - analysis ; organic soils ; pastures ; peat soils ; peatland ; Peatlands ; photosynthesis ; restored ; rice ; Soil - chemistry ; subsidence ; wetland ; Wetlands
É parte de: Global change biology, 2015-02, Vol.21 (2), p.750-765
Notas: http://dx.doi.org/10.1111/gcb.12745
Bryan Brock
istex:6146016E61B8AF7AD7BCD075F99D6D6A8AAB52CA
United Sates Department of Energy - No. 7079856
ArticleID:GCB12745
California Department of Water Resources - No. 4600008849
United Sates Department of Agriculture NIFA - No. 2011-67003-30371
National Science and Engineering Research Council of Canada Program
ark:/67375/WNG-4LL1BK78-R
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: Agricultural drainage of organic soils has resulted in vast soil subsidence and contributed to increased atmospheric carbon dioxide (CO₂) concentrations. The Sacramento‐San Joaquin Delta in California was drained over a century ago for agriculture and human settlement and has since experienced subsidence rates that are among the highest in the world. It is recognized that drained agriculture in the Delta is unsustainable in the long‐term, and to help reverse subsidence and capture carbon (C) there is an interest in restoring drained agricultural land‐use types to flooded conditions. However, flooding may increase methane (CH₄) emissions. We conducted a full year of simultaneous eddy covariance measurements at two conventional drained agricultural peatlands (a pasture and a corn field) and three flooded land‐use types (a rice paddy and two restored wetlands) to assess the impact of drained to flooded land‐use change on CO₂and CH₄fluxes in the Delta. We found that the drained sites were net C and greenhouse gas (GHG) sources, releasing up to 341 g C m⁻² yr⁻¹as CO₂and 11.4 g C m⁻² yr⁻¹as CH₄. Conversely, the restored wetlands were net sinks of atmospheric CO₂, sequestering up to 397 g C m⁻² yr⁻¹. However, they were large sources of CH₄, with emissions ranging from 39 to 53 g C m⁻² yr⁻¹. In terms of the full GHG budget, the restored wetlands could be either GHG sources or sinks. Although the rice paddy was a small atmospheric CO₂sink, when considering harvest and CH₄emissions, it acted as both a C and GHG source. Annual photosynthesis was similar between sites, but flooding at the restored sites inhibited ecosystem respiration, making them net CO₂sinks. This study suggests that converting drained agricultural peat soils to flooded land‐use types can help reduce or reverse soil subsidence and reduce GHG emissions.
Editor: England: Blackwell Science
Idioma: Inglês

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Agricultural peatland restoration: effects of land‐use change on greenhouse gas (CO2 and CH4) fluxes in the Sacramento‐San Joaquin Delta

Knox, Sara Helen ; Sturtevant, Cove ; Matthes, Jaclyn Hatala ; Koteen, Laurie ; Verfaillie, Joseph ; Baldocchi, Dennis

England: Blackwell Science

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