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

Li, Xiaoyü; Mitsch, William J.

doi:10.1016/j.ecoleng.2016.01.001

Cited by 16 publications

(8 citation statements)

References 52 publications

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“…Reduced emissions at low temperatures are expected as the temperature is a primary driver of any metabolic process, including respiration and nitrification-denitrification. Mangroves tend to have higher CO 2 emissions as temperature increases (Liu and Lai, 2019), and forests have significantly higher N 2 O emissions during warm seasons (Schindlbacher et al, 2004). Emissions of CH 4 also tend to increase with temperature as the activity of methane-producing soil microbes (Ding et al, 2004) and the availability of carbon are higher in warmer conditions (Yvon-Durocher et al, 2011).…”

Section: Sitementioning

confidence: 99%

Soil greenhouse gas fluxes from tropical coastal wetlands and alternative agricultural land uses

et al. 2021

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Abstract. Coastal wetlands are essential for regulating the global carbon budget through soil carbon sequestration and greenhouse gas (GHG – CO2, CH4, and N2O) fluxes. The conversion of coastal wetlands to agricultural land alters these fluxes' magnitude and direction (uptake/release). However, the extent and drivers of change of GHG fluxes are still unknown for many tropical regions. We measured soil GHG fluxes from three natural coastal wetlands – mangroves, salt marsh, and freshwater tidal forests – and two alternative agricultural land uses – sugarcane farming and pastures for cattle grazing (ponded and dry conditions). We assessed variations throughout different climatic conditions (dry–cool, dry–hot, and wet–hot) within 2 years of measurements (2018–2020) in tropical Australia. The wet pasture had by far the highest CH4 emissions with 1231±386 mgm-2d-1, which were 200-fold higher than any other site. Dry pastures and sugarcane were the highest emitters of N2O with 55±9 mgm-2d-1 (wet–hot period) and 11±3 mgm-2d-1 (hot-dry period, coinciding with fertilisation), respectively. Dry pastures were also the highest emitters of CO2 with 20±1 gm-2d-1 (wet–hot period). The three coastal wetlands measured had lower emissions, with salt marsh uptake of -0.55±0.23 and -1.19±0.08 gm-2d-1 of N2O and CO2, respectively, during the dry–hot period. During the sampled period, sugarcane and pastures had higher total cumulative soil GHG emissions (CH4+N2O) of 7142 and 56 124 CO2-eqkgha-1yr-1 compared to coastal wetlands with 144 to 884 CO2-eqkgha-1yr-1 (where CO2-eq is CO2 equivalent). Restoring unproductive sugarcane land or pastures (especially ponded ones) to coastal wetlands could provide significant GHG mitigation.

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Section: Sitementioning

confidence: 99%

Soil greenhouse gas fluxes from tropical coastal wetlands and alternative agricultural land uses

et al. 2021

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“…A brackish marsh, located approximately 1 km inland from the end of the creek and described by Li and Mitsch (2016), was restored in 2008 from a forested brackish swamp dominated by the invasive tree, Melaleuca quinquenervia. The restored brackish marsh is now dominated by the native grass, Spartina bakeri.…”

Section: Site Descriptionmentioning

confidence: 99%

A mangrove creek restoration plan utilizing hydraulic modeling

Marois

Mitsch

2017

Ecological Engineering

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Despite the valuable ecosystem services provided by mangrove ecosystems they remain threatened around the globe. Urban development has been a primary cause for mangrove destruction and deterioration in south Florida USA for the last several decades. As a result, the restoration of mangrove forests has become an important topic of research. Using field sampling and remote-sensing we assessed the past and present hydrologic conditions of a mangrove creek and its connected mangrove forest and brackish marsh systems located on the coast of Naples Bay in southwest Florida. We concluded that the hydrology of these connected systems had been significantly altered from its natural state due to urban development. We propose here a mangrove creek restoration plan that would extend the existing creek channel 1.1 km inland through the adjacent mangrove forest and up to an adjacent brackish marsh. We then tested the hydrologic implications using a hydraulic model of the mangrove creek calibrated with tidal data from Naples Bay and water levels measured within the creek. The calibrated model was then used to simulate the resulting hydrology of our proposed restoration plan. Simulation results showed that the proposed creek extension would restore a twice-daily flooding regime to a majority of the adjacent mangrove forest and that there would still be minimal tidal influence on the brackish marsh area, keeping its salinity at an acceptable level. This study demonstrates the utility of combining field data and hydraulic modeling to aid in the design of mangrove restoration plans.

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“…Methane makes a significant contribution to the global climate change [6], and the continuous methane emissions may cause further warming and changes in many components of the climate system [7,8]. Therefore, research on methane emissions and their required controls in wastewater treatment systems is an important issue [9]. Climate-driven fluctuations of the CH 4 emissions from natural wetlands (177 to 284 × 10 12 g (CH 4 ) yr −1 ), and anthropogenic emissions account for 50 to 65% of total emissions of the global methane [10].…”

Section: Introductionmentioning

confidence: 99%

Methane Emissions Driven by Adding a Gradient of Ethanol as Carbon Source in Integrated Vertical-Flow Constructed Wetlands

Liu¹,

Wang

et al. 2019

Water

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This work aims to investigate the methane emissions from integrated vertical-flow constructed wetlands (IVCWs) when ethanol is added as an external carbon source. In this study, a gradient of ethanol (0, 2, 4, 8, 16 and 32 mmol/L) was added as the carbon source in an IVCW planted with Cyperus alternifolius L. The results showed that the methane emission flux at an ethanol concentration of 32 mmol/L was 32.34 g CH4 m−2 day−1 less than that of the control experiment (0 mmol/L) and that the methane emission flux at an ethanol concentration of 16 mmol/L was 5.53 g CH4 m−2 day−1 less than that at 0 mmol/L. In addition, variations in the water quality driven by the different ethanol concentrations were found, with a redox potential range of −64 mV to +30 mV, a pH range of 6.6–6.9, a chemical oxygen demand (COD) removal rate range of 41% to 78%, and an ammonia nitrogen removal rate range of 59% to 82% after the ethanol addition. With the average CH4-C/TOC (%) value of 35% driven by ethanol, it will be beneficial to understand that CH4-C/TOC can be considered an ecological indicator of anthropogenic methanogenesis from treatment wetlands when driven by carbon sources or carbon loading. It can be concluded that adding ethanol as an external carbon source can not only meet the water quality demand of the IVCW treatment system but also stimulate and increase the average CH4 emissions from IVCWs by 23% compared with the control experiment. This finding indicates that an external carbon source can stimulate more CH4 emissions from IVCWs and shows the importance of carbon sources during sewage treatment processes when considering greenhouse emissions from treated wetlands.

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

Cited by 16 publications

References 52 publications

Soil greenhouse gas fluxes from tropical coastal wetlands and alternative agricultural land uses

Soil greenhouse gas fluxes from tropical coastal wetlands and alternative agricultural land uses

A mangrove creek restoration plan utilizing hydraulic modeling

Methane Emissions Driven by Adding a Gradient of Ethanol as Carbon Source in Integrated Vertical-Flow Constructed Wetlands

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