Physiological control of leaf methane emission from wetland plants

Garnet, Kristy N.; Megonigal, J. Patrick; Litchfield, Carol D.; Taylor, George

doi:10.1016/j.aquabot.2004.10.003

Cited by 84 publications

(65 citation statements)

References 27 publications

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“…The higher emission rates measured by floating chambers placed over flooded vegetation at Itu sites suggest that emergent macrophytes at this site are transporting methane from the sediments to the atmosphere through their aerenchyma, as has been observed elsewhere (Kim et al 1999;King et al 1998) and demonstrated in laboratory experiments (Garnet et al 2005). The apparent absence of this process at the Cuini sites may be related to differences in sediments and vegetation between the sites.…”

Section: Discussionmentioning

confidence: 72%

Carbon dioxide and methane emissions from interfluvial wetlands in the upper Negro River basin, Brazil

2010

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Extensive interfluvial wetlands occur in the upper Negro River basin (Brazil) and contain a mosaic of vegetation dominated by emergent grasses and sedges with patches of shrubs and palms. To characterize the release of carbon dioxide and methane from these habitats, diffusive and ebullitive emissions and transport through plant aerenchyma were measured monthly during 2005 in permanently and seasonally flooded areas. CO 2 emissions averaged 2193 mg C m -2 day -1. Methane was consumed in unflooded environments and emitted in flooded environments with average values of -4.8 and 60 mg C m -2 day -1

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Section: Discussionmentioning

confidence: 72%

Carbon dioxide and methane emissions from interfluvial wetlands in the upper Negro River basin, Brazil

2010

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“…Aquatic plant roots influence the activity of microorganisms through organic matter production and oxygen transportation to the rhizosphere (Garnet et al 2005). On the other hand, methane found in the sediment can be transported to the atmosphere across the macrophytes' aerenchyma tissues (Laanbroek, 2010), reducing gas consumption and carbon accumulation in the sediment.…”

Section: Discussionmentioning

confidence: 99%

The role played by aquatic macrophytes regarding CO2 balance in a tropical coastal lagoon (Cabiúnas Lagoon, Macaé, RJ)

Gripp¹,

Marinho²,

Sanches³

et al. 2013

Acta Limnol. Bras.

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The role played by aquatic macrophytes regarding CO 2 balance in a tropical coastal lagoon (Cabiúnas Lagoon, Macaé, RJ)O papel desempenhado pelas macrófitas aquáticas em relação ao balanço de CO 2 em uma lagoa costeira tropical (Lagoa Cabiúnas, Macaé, RJ) 2 ) is an important atmospheric trace gas that is involved in both the biological carbon cycle and global warming. Inland waters -mainly lakes -contribute to C cycling and have been considered a large source of atmospheric CO 2 . However, scientific studies usually neglect lake morphometry and the presence of aquatic macrophytes in littoral zones, which have a great potential for CO 2 absorption and for C storage. This study aimed to evaluate the importance of the littoral region on the CO 2 balance in the Cabiúnas Lagoon, while also considering the contribution of the limnetic region and of Typha domingensis and Eichhornia azurea, prominent species in the area. Methods: CO 2 flux was estimated by a linear integration of CO 2 concentrations measured in the internal atmospheric of a single-component static closed chambers at the studied sites. The distribution of macrophyte stands throughout lagoon surface was taken into account to evaluate the effects of macrophytes on CO 2 supersaturation. Other factors were also measured throughout the sampling process to evaluate their relationship with CO 2 flux data by means of Akaike model selection criterion. The area covered by aquatic macrophytes at the Cabiúnas lagoon was estimated by profiles and transects. Results and discussion: CO 2 flux through the water surface ranged from -7.39 to 17.56 mgCO2m -2 h -1 . An emission pattern predominated, suggesting that water columns are CO 2 supersaturated at all sampling sites. Rates were similar among all the sampling sites, suggesting that aquatic macrophytes do not influence CO 2 saturation in the water column at Cabiúnas lagoon. On the other hand, CO 2 fluxes from macrophyte tissues showed a clear assimilation pattern. Influxes were higher in T. domingensis (-229.1 ± 320.9 mg CO2.m -2 .h -1 ) than in E. azurea stands (-43.8 ± 39.5 mg CO2.m -2 .h -1 ). Once these macrophytes covered a considerable area of the lagoon and CO 2 absorption strongly overwhelmed the emission processes, then we were able to extrapolate data from the total estimated area of the evaluated sites (75% of the Cabiúnas lagoon), which resulted in a net influx of 46.6 mg CO2.m -2 .h -1 . The strong Typha domingensis contribution to CO 2 absorption and other C cycling processes indicate that it is one of the most important species to Carbon cycling in the studied ecosystem. Thus, it is worth considering C cycling in lake littoral zones as a key process when estimating C balance in shallow aquatic ecosystems.

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“…Earlier work has shown that differences in plant species (van Hannen et al 1999) or cultivar (Lou et al 2008) can have profound effects on methane (CH 4 ) emissions. Such differences in CH 4 emissions are attributed to differences in plant traits that influence the balance between plant-supported CH 4 production and oxidation (Sutton-Grier and Megonigal 2011) and ecophysiological phenomena that regulate the ventilation of CH 4 through plants to the atmosphere (Sharkey et al 1991;Garnet et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Increased Methane Emissions by an Introduced Phragmites australis Lineage under Global Change

Mozdzer

Megonigal

2013

Wetlands

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North American wetlands have been invaded by an introduced lineage of the common reed, Phragmites australis. Native lineages occur in North America, but many populations have been extirpated by the introduced conspecific lineage. Little is known about how subtle changes in plant lineage may affect methane (CH 4 ) emissions. Native and introduced Phragmites were grown under current and predicted future levels of atmospheric CO 2 and nitrogen(N) pollution in order to understand how CH 4 emissions may vary between conspecific lineages. We found introduced Phragmites emitted more CH 4 than native Phragmites, and that CH 4 emissions increased significantly in both with CO 2 +N treatment. There was no significant difference in CH 4 production potentials, but CH 4 oxidation potentials were higher in soils from the introduced lineage. Intraspecific plant responses to resource availability changed CH 4 emissions, with plant density, root mass, and leaf area being significantly positively correlated with higher emissions. The absence of CO 2 -only or N-only effects highlights a limitation on the generalization that CH 4 emissions are proportional to plant productivity. Our data suggest that intraspecific changes in plant community composition have important implications for greenhouse emissions. Furthermore, global change-enhanced invasion by introduced Phragmites may increase CH 4 emissions unless these factors cause a compensatory increase in carbon sequestration.

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Physiological control of leaf methane emission from wetland plants

Cited by 84 publications

References 27 publications

Carbon dioxide and methane emissions from interfluvial wetlands in the upper Negro River basin, Brazil

Carbon dioxide and methane emissions from interfluvial wetlands in the upper Negro River basin, Brazil

The role played by aquatic macrophytes regarding CO2 balance in a tropical coastal lagoon (Cabiúnas Lagoon, Macaé, RJ)

Increased Methane Emissions by an Introduced Phragmites australis Lineage under Global Change

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