Annual cycle of CO2 exchange over a reed (Phragmites australis) wetland in Northeast China

Zhou, Li; Zhou, Guangsheng; Jia, Qingyu

doi:10.1016/j.aquabot.2009.03.002

Cited by 90 publications

(84 citation statements)

References 35 publications

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“…Once flux rates were measured during daylight, carbon fixation by photosynthesis were the dominant process in macrophyte stands, exceeding total respiration. The same trend has been observed by other researchers in wetland ecosystems (Bolpagni et al 2007;Zhou et al, 2009).…”

Section: Discussionsupporting

confidence: 90%

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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Section: Discussionsupporting

confidence: 90%

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 fluxes were mainly influenced by the presence of green plants (high negative correlation with global radiation) and temperature changes. A similar diurnal and seasonal variation was observed in a Phragmites wetland in northeast China based on EC measurements (Zhou et al, 2009). They also observed the highest CO 2 uptake in July with −13.6 g CO 2 m −2 day −1 , which is lower than our measured uptake of −17.5 g CO 2 m −2 day −1 , and a small release of CO 2 in winter, which is in the same range (2.6 g CO 2 m −2 day −1 vs. 2.7 kg CO 2 m −2 day −1 ) as our observations.…”

Section: Co 2 Flux Patternssupporting

confidence: 79%

“…This means that methane emissions should be highly dependent on this transport mechanism. Apart from this potential influence of humidity-induced convection (HIC) on methane fluxes, Phragmites wetlands can also accrete large amounts of carbon in the soil due to the high annual primary production compared to other wetland plants (Brix et al, 2001;Zhou et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…Several studies on methane emissions (Kim et al, 1998a;van der Nat and Middelburg, 2000) and CO 2 emissions (Zhou et al, 2009) from Phragmites-dominated wetlands have been published. Most of them used the closed chamber method.…”

Section: Introductionmentioning

confidence: 99%

“…Most of them used the closed chamber method. Despite Phragmites australis being the most abundant wetland species on earth, to date, the eddy covariance (EC) technique has only been used at two study sites: Kim et al (1998a) performed CH 4 flux measurements in a fen in Nebraska, USA, and Zhou et al (2009) measured CO 2 fluxes from a Phragmites wetland in northeast China. To our knowledge, EC CO 2 and CH 4 flux data from European Phragmites wetlands does not exist.…”

Section: Introductionmentioning

confidence: 99%

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The role of Phragmites in the CH4 and CO2 fluxes in a minerotrophic peatland in southwest Germany

et al. 2016

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Abstract. Peatlands are interesting as a carbon storage option, but are also natural emitters of the greenhouse gas methane (CH 4 ). Phragmites peatlands are particularly interesting due to the global abundance of this wetland plant (Phragmites australis) and the highly efficient internal gas transport mechanism, which is called humidity-induced convection (HIC). The research aims were to (1) clarify how this plant-mediated gas transport influences the CH 4 fluxes, (2) which other environmental variables influence the CO 2 and CH 4 fluxes, and (3) whether Phragmites peatlands are a net source or sink of greenhouse gases. CO 2 and CH 4 fluxes were measured with the eddy covariance technique within a Phragmites-dominated fen in southwest Germany. One year of flux data (March 2013-February 2014 shows very clear diurnal and seasonal patterns for both CO 2 and CH 4 . The diurnal pattern of CH 4 fluxes was only visible when living, green reed was present. In August the diurnal cycle of CH 4 was the most distinct, with 11 times higher midday fluxes (15.7 mg CH 4 m −2 h −1 ) than night fluxes (1.41 mg CH 4 m −2 h −1 ). This diurnal cycle has the highest correlation with global radiation, which suggests a high influence of the plants on the CH 4 flux. But if the cause were the HIC, it would be expected that relative humidity would correlate stronger with CH 4 flux. Therefore, we conclude that in addition to HIC, at least one additional mechanism must be involved in the creation of the convective flow within the Phragmites plants. Overall, the fen was a sink for carbon and greenhouse gases in the measured year, with a total carbon uptake of 221 g C m −2 yr −1 (26 % of the total assimilated carbon). The net uptake of greenhouse gases was 52 g CO 2 eq. m −2 yr −1 , which is obtained from an uptake of CO 2 of 894 g CO 2 eq. m −2 yr −1 and a release of CH 4 of 842 g CO 2 eq. m −2 yr −1 .

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Carbon dioxide fluxes of an urban tidal marsh in the Hudson‐Raritan estuary

Schäfer

Tripathee

Artigas³

et al. 2014

JGR Biogeosciences

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Net ecosystem exchange (NEE) of tidal brackish wetlands in urban areas is largely unknown, albeit it is an important ecosystem service. High carbon dioxide (CO 2 ) uptake of estuaries can potentially be achieved by creating conditions that foster CO 2 uptake and sequestration. Thus, this study sought to assess NEE in a mesohaline tidal urban wetland that has been restored and determine the biophysical drivers of NEE in order to investigate uptake strength and drivers thereof. Beginning in 2009, NEE was measured using the eddy covariance technique in a restored urban estuarine wetland. Maximum NEE rates observed were À30 μmol m À2 s À1 under high light conditions in the summer. Monthly mean NEE showed this ecosystem to be a CO 2 source in the winter, but a CO 2 sink in summer. Conditional Granger causality showed the influence of net radiation on half daily to biweekly timescales on NEE and the influence of water level at half daily time scales. The overall productivity of this wetland is within the expected range of tidal brackish marshes and it was a sink for atmospheric CO 2 in two out of the 3 years of this study and had a continued increase over the study period.

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Annual cycle of CO2 exchange over a reed (Phragmites australis) wetland in Northeast China

Cited by 90 publications

References 35 publications

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

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

The role of <i>Phragmites</i> in the CH<sub>4</sub> and CO<sub>2</sub> fluxes in a minerotrophic peatland in southwest Germany

Carbon dioxide fluxes of an urban tidal marsh in the Hudson‐Raritan estuary

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Annual cycle of CO2 exchange over a reed (Phragmites australis) wetland in Northeast China

Cited by 90 publications

References 35 publications

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

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

The role of &lt;i&gt;Phragmites&lt;/i&gt; in the CH&lt;sub&gt;4&lt;/sub&gt; and CO&lt;sub&gt;2&lt;/sub&gt; fluxes in a minerotrophic peatland in southwest Germany

Carbon dioxide fluxes of an urban tidal marsh in the Hudson‐Raritan estuary

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The role of <i>Phragmites</i> in the CH<sub>4</sub> and CO<sub>2</sub> fluxes in a minerotrophic peatland in southwest Germany