Methane emissions from five wetland plant communities with different hydroperiods in the Big Cypress Swamp region of Florida Everglades

Villa, Jorge A.; Mitsch, William J.

doi:10.1016/j.ecohyd.2014.07.005

Cited by 18 publications

(12 citation statements)

References 50 publications

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“…CH 4 emissions from the study site showed significant seasonal dynamics; emissions mainly peaked from June to August (summer), and were low in other seasons, which is consistent with findings of previous studies . Wetland CH 4 is mainly transferred to the atmosphere through the soil–water–plant system, while plant transfer is the main CH 4 transfer route in vegetated areas .…”

Section: Discussionsupporting

confidence: 90%

“…Hydrological conditions (such as soil water content, water depth fluctuation) are important ecological attributes of wetlands, and are among the influencing factors of wetland CH 4 emissions . This is because variation in water depth not only affects the species composition, distribution, and growth of wetland plants , it may also cause changes in soil permeability, soil, and pore water nutrients, temperature, redox environment, and other physical and chemical properties.…”

Section: Introductionmentioning

confidence: 99%

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Influencing factors of methane emission dynamics at different water depths in hangzhou bay reed wetland, China

Shao

Sheng

et al. 2017

Env Prog and Sustain Energy

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Water depth (WD) influences wetland methane (CH 4 ) emissions by affecting plant growth and the physical and chemical properties of soil. We studied the factors influencing CH 4 emission dynamics at different WD in reclaimed reed wetland in Hangzhou Bay, China. The annual average WD was set as WD0 (0 cm), WD1 (10 cm), WD2 (20 cm), and WD3 (35 cm). The transparent chamber-gas chromatography method was used to determine CH 4 fluxes during the growing season. Results showed that the average CH 4 flux was 7.03 mg m 22 h 21 , and that CH 4 fluxes under all 4 WDs presented as a CH 4 source. CH 4 emissions of the reed wetland showed obvious seasonal changes; summer was the peak period for CH 4 emissions. In a vigorous growth period of reeds, the CH 4 flux gradually increased as WD increased. However, in early and late growth periods of reed, CH 4 flux first increased (WD0 < WD1 < WD2) then decreased (WD2 > WD3) as WD increased. Correlation analysis showed that at the 4 WDs, CH 4 flux was significantly, positively correlated with air temperature, soil temperature, and aboveground biomass of reeds, and were highly significantly positively correlated with water temperature. In addition, at WD0, CH 4 flux also showed a significant, positive correlation with soil organic carbon content in the 0-5 and 5-10 cm soil layers, and was significantly negatively correlated with soil water content. Hence, WD significantly influenced wetland CH 4 emissions. Temperature and biomass were major influencing factors of CH 4 emission in reed wetland at different WDs.

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Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Influencing factors of methane emission dynamics at different water depths in hangzhou bay reed wetland, China

Shao

Sheng

et al. 2017

Env Prog and Sustain Energy

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“…3 ), methane emissions rates got from a linear regression was used to calculate hourly CH 4 flux (mg CH 4 -C m -2 h -1 ), according to the methods described by Villa and Mitsch (2014). Average hourly methane emission rates were calculated by two replicates from averaging morning and afternoon fluxes.…”

Section: Methane Flux Measurements and Analysismentioning

confidence: 99%

Methane emissions from created and restored freshwater and brackish marshes in southwest Florida, USA

Mitsch

2016

Ecological Engineering

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It is important to estimate greenhouse gas emissions from newly created and restored wetlands so that we learn how to design them to minimize these emissions. Spatial and temporal patterns of methane emissions were measured in three wetland marsh complexes in southwest Florida: a created freshwater marsh on a university campus, a restored brackish/salt marsh on the fringe of a mangrove (Rhizophora mangle) coastal swamp; and a natural freshwater marsh adjacent to a cypress (Taxodium distichum) strand. Non-steady-state rigid chambers were used twice a day (morning and afternoon) on a monthly schedule for 13 months. The mean ± standard error (median) of methane emissions from permanently and intermittently flooded areas were 124 ± 47 (0) and 0.8 ± 0.7 (0) g-CH 4-C m-2 y-1 in the created freshwater marsh, and 58 ± 14 (9.4) and-0.1 ± 0.3 (0) g-CH 4-C m-2 y-1 in restored brackish marsh. Methane missions

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“…Mitsch et al 2013). The pine flatwood community was excluded from this analysis because it acted as a net sink for CH 4 during the study period considered in Villa and Mitsch (2014). The GWPs used were the three reported in Forster et al (2007) (i.e.…”

Section: Carbon Sequestration Versus Methane Emissionsmentioning

confidence: 99%

“…The CH 4 /CO 2 ratio was calculated using the average 2-yr CH 4 emissions measured by Villa and Mitsch (2014) (26.9 g CH 4 m −2 yr −1 in deep slough, 2.7 g CH 4 m −2 yr −1 in bald cypress, 25.9 g CH 4 m −2 yr −1 in wet prairie and 3 g CH 4 m −2 yr −1 in pond cypress). The C sequestration rates in this study assumed as the net atmospheric CO 2 assimilated by the system (e.g.…”

Section: Carbon Sequestration Versus Methane Emissionsmentioning

confidence: 99%

Carbon sequestration in different wetland plant communities in the Big Cypress Swamp region of southwest Florida

Villa

Mitsch

2014

International Journal of Biodiversity Science, Ecosystem Servic

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Wetlands offer many ecosystem services, including the long-term sequestering of carbon (C) in soil. Here we present a study of C sequestration rates in a relatively undisturbed wetland landscape of southwest Florida. Accordingly, carbon sequestration was determined in four wetland plant communities and an adjacent hydric pine flatwood community that represent a gradient of inundation extent. Going from the wettest to the driest, communities were designated as: deep slough, bald cypress (Taxodium distichum), wet prairie and pond cypress (Taxodium distichum var. imbricarium). An adjacent hydric pine flatwood community was also included in the study as a reference upland site. Three soil cores were collected from each of these communities and were analyzed for total C content. Core samples were also analyzed for 137 Cs and 210 Pb activity to estimate accretion rates. C sequestration rates (g-C m −2 yr −1 ) were the highest in the deep slough (98 ± 9) and bald cypress (98 ± 5) followed by the pond cypress (64 ± 7), wet prairie (39 ± 1) and pine flatwood (22 ± 5). These results suggest that impediment of decomposition by anaerobic conditions caused by prolonged wet cycles, may not account for all the variability in C sequestration rates observed in this subtropical setting. Instead, this variability could also be attributed to other factors like the quantity and chemical composition of the organic material reaching the soil. When methane emissions are taken into account, cypress-dominated (bald and pond cypress) and the deep slough communities act as net carbon sinks.

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Methane emissions from five wetland plant communities with different hydroperiods in the Big Cypress Swamp region of Florida Everglades

Cited by 18 publications

References 50 publications

Influencing factors of methane emission dynamics at different water depths in hangzhou bay reed wetland, China

Influencing factors of methane emission dynamics at different water depths in hangzhou bay reed wetland, China

Methane emissions from created and restored freshwater and brackish marshes in southwest Florida, USA

Carbon sequestration in different wetland plant communities in the Big Cypress Swamp region of southwest Florida

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