Impact of intensive fish farming on methane emission in a tropical hydropower reservoir

Silva, Marcelo Gomes da; Packer, Ana Paula; Sampaio, Fernanda Garcia; Marani, Luciano; Mariano, Ericka Voss Chagas; Pazianotto, R. A. A.; Ferreira, Willian José; Alvalá, Plínio Carlos

doi:10.1007/s10584-018-2281-4

Cited by 14 publications

(6 citation statements)

References 47 publications

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“…■ DISCUSSION Subtropical Coastal Reservoirs as Net Sources of Atmospheric CH 4 . Although CH 4 dynamics in coastal reservoirs were relatively understudied, the magnitude of dissolved CH 4 concentrations found in this study was comparable to those previously reported in the inland reservoirs in the tropical, 4,38 subtropical, 8,9 and temperate 20,22,39 regions (Table 4). The dissolved CH 4 concentrations in our subtropical coastal reservoir were supersaturated with respect to atmospheric equilibrium, indicating that this reservoir acted as a net source of atmospheric CH 4 .…”

Section: ■ Resultssupporting

confidence: 90%

“…The dissolved CH 4 concentrations in our subtropical coastal reservoir were supersaturated with respect to atmospheric equilibrium, indicating that this reservoir acted as a net source of atmospheric CH 4 . The magnitude of mean diffusive CH 4 emissions observed in this study (16.1 μmol m −2 h −1 ) was similar to that observed in other tropical, 4,38,40 subtropical, 8,9,41,42 and temperate 20,39,43 reservoirs, but was considerably lower than those reported in the reservoirs in Furnas in Brazil 40 and Harsha in the USA 22 (104−608 μmol m −2 h −1 ; Table 4).…”

Section: ■ Resultssupporting

confidence: 88%

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Large Spatial Variations in Diffusive CH₄ Fluxes from a Subtropical Coastal Reservoir Affected by Sewage Discharge in Southeast China

Yang

Sardans

et al. 2020

Environ. Sci. Technol.

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Coastal reservoirs are potentially CH4 emission hotspots owing to their biogeochemical role as the sinks of anthropogenic carbon and nutrients. Yet, the fine-scale spatial variations in CH4 concentrations and fluxes in coastal reservoirs remain poorly understood, hampering an accurate determination of reservoir CH4 budgets. In this study, we examined the spatial variability of diffusive CH4 fluxes and their drivers at a subtropical coastal reservoir in southeast China using high spatial resolution measurements of dissolved CH4 concentrations and physicochemical properties of the surface water. Overall, this reservoir acted as a consistent source of atmospheric CH4, with a mean diffusive flux of 16.1 μmol m -2 h -1 . The diffusive CH4 flux at the reservoir demonstrated considerable spatial variations, with the coefficients of variation ranging between 199 and 426% over the three seasons. The shallow water zone (comprising 23% of the reservoir area) had a disproportionately high contribution (56%) to the whole-reservoir diffusive CH4 emissions. Moreover, the mean CH4 flux in the sewage-affected sectors was significantly higher than that in the nonsewage-affected sectors. The results of bootstrap analysis further showed that increasing the sample size from 10 to 100 significantly reduced the relative standard deviation of mean diffusive CH4 flux from 73.7 to 3.4%. Our findings highlighted the role of sewage in governing the spatial variations in reservoir CH4 emissions and the importance of high spatial resolution data to improve the reliability of flux estimates for assessing the contribution of reservoirs to the regional and global CH4 budgets.

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Section: ■ Resultssupporting

confidence: 90%

Section: ■ Resultssupporting

confidence: 88%

Large Spatial Variations in Diffusive CH₄ Fluxes from a Subtropical Coastal Reservoir Affected by Sewage Discharge in Southeast China

Yang

Sardans

et al. 2020

Environ. Sci. Technol.

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“…Concentrations of CH 4 and CO 2 in the deep sediment layer (8–10 cm) were highest in the river delta (P1), declined gradually along the reservoir branch (P2–P3) and increased in the main basin (P4–P9), with a notably high value near the fish aquaculture area (Site P7; Figure 1 and Figure S4 in Supporting Information ). Similar trends reported in previous studies were attributed to a higher organic matter content in river deltas and aquaculture sites, promoting CO 2 and CH 4 production (Grinham et al., 2018; da Silva et al., 2018). Measured δ 13 CO 2 in deep sediments was generally >−20‰ (Figure S2 in Supporting Information ), and positively correlated to CH 4 concentration ( R 2 adj = 0.84, p ‐value <0.001; Figure S6 in Supporting Information ).…”

Section: Resultssupporting

confidence: 87%

Patterns and Regulation of Hypolimnetic CO₂ and CH₄ in a Tropical Reservoir Using a Process‐Based Modeling Approach

Soued

Prairie

2022

JGR Biogeosciences

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Inland waters play a key role in the carbon (C) cycle, emitting large amounts of greenhouse gases to the atmosphere in the form of CO 2 and CH 4 (abbreviated as C-GHG in this article). These emissions are sustained by external C inputs and internal mineralization. A substantial portion of the C mineralization occurs below the thermocline, in the deep water column and sediments, leading to an accumulation of CO 2 and CH 4 . Hypolimnetic C-GHG storage can induce large peaks of C-GHG out-flux during lake mixing events, like at fall overturn (Bastviken et al., 2004;Encinas Fernández et al., 2014). Deep C-GHG storage is particularly relevant in permanently stratified systems (common in the tropics), where rare mixing events can trigger alarming amounts of gas release (Schmid et al., 2005). In natural lakes, a large fraction of the CH 4 produced is consumed by methanotrophic bacteria before reaching the atmosphere. In reservoirs however, deep water withdrawal often leads to a direct

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“…An earlier study estimated that GHGs (CO 2 and CH 4 ) efflux from mariculture ponds across the subtropical estuaries of China would be equivalent to~15% of the net carbon emissions from the terrestrial natural ecosystems in China . It is worth noting that the CH 4 emissions fluxes in subtropical estuarine aquaculture ponds were substantially higher than those from the freshwater aquaculture systems (e.g., Da Silva et al, 2018;Hu et al, 2014;Hu et al, 2016;Liu et al, 2015;Wu et al, 2018) and were 1 to 3 orders of magnitude larger than those observed in most reservoirs and lakes (e.g., Gerardo-Nieto et al, 2017;Huttunen et al, 2003;Musenze et al, 2014;Natchimuthu et al, 2016;Wen et al, 2016;Xiao et al, 2017;Zhao et al, 2013;Zhu et al, 2010). CH 4 diffusion fluxes in our ponds were also substantially higher than those in coastal aquatic ecosystems (Sierra et al, 2017) and was approximately 8 times higher than the average of 0.09 mmol·m −2 ·hr −1 found in Chinas natural wetlands (Wei & Wang, 2017).…”

Section: Implications Of Large Ch 4 Emission Fluxmentioning

confidence: 99%

Large Fine‐Scale Spatiotemporal Variations of CH₄ Diffusive Fluxes From Shrimp Aquaculture Ponds Affected by Organic Matter Supply and Aeration in Southeast China

et al. 2019

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Mariculture shrimp ponds are important CH4 sources to the atmosphere. However, the spatiotemporal variations of CH4 concentration and flux at fine spatial scales in mariculture ponds are poorly known, particularly in China, worlds largest aquaculture producer. In this study, the plot‐scale spatiotemporal variations of water CH4 concentration and flux, both within and among ponds, were researched in shrimp ponds in Shanyutan wetland, Min River Estuary, Southeast China. The average water CH4 concentration and diffusion flux across the water‐air interface in the shrimp ponds over the shrimp aquaculture period varied from 2.29 ± 0.29 to 50.48 ± 20.91 μM and from 0.09 ± 0.01 to 2.32 ± 0.95 mmol·m−2·hr−1, respectively. The CH4 emissions from the estuarine ponds varied greatly between seasons, with peaks in August and September, which was similar to the trend of water temperature and dissolved oxygen concentrations. There was no remarkable difference in CH4 concentration and flux between shrimp ponds but significantly spatiotemporal differences in CH4 concentration and flux within the ponds. Significantly higher emissions occurred in the feeding zone, accounting for approximately 60% of total CH4 emission flux, while much lower CH4 emissions appeared in aeration zone, contributing 14% to total flux. This study suggests the importance of considering spatiotemporal variation in the whole‐pond estimates of CH4 concentration and flux. In light of such high spatial variation within ponds, improving aeration and feed utilization efficiency would help to mitigate CH4 emissions from mariculture ponds.

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Impact of intensive fish farming on methane emission in a tropical hydropower reservoir

Cited by 14 publications

References 47 publications

Large Spatial Variations in Diffusive CH₄ Fluxes from a Subtropical Coastal Reservoir Affected by Sewage Discharge in Southeast China

Large Spatial Variations in Diffusive CH₄ Fluxes from a Subtropical Coastal Reservoir Affected by Sewage Discharge in Southeast China

Patterns and Regulation of Hypolimnetic CO₂ and CH₄ in a Tropical Reservoir Using a Process‐Based Modeling Approach

Large Fine‐Scale Spatiotemporal Variations of CH₄ Diffusive Fluxes From Shrimp Aquaculture Ponds Affected by Organic Matter Supply and Aeration in Southeast China

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Impact of intensive fish farming on methane emission in a tropical hydropower reservoir

Cited by 14 publications

References 47 publications

Large Spatial Variations in Diffusive CH4 Fluxes from a Subtropical Coastal Reservoir Affected by Sewage Discharge in Southeast China

Large Spatial Variations in Diffusive CH4 Fluxes from a Subtropical Coastal Reservoir Affected by Sewage Discharge in Southeast China

Patterns and Regulation of Hypolimnetic CO2 and CH4 in a Tropical Reservoir Using a Process‐Based Modeling Approach

Large Fine‐Scale Spatiotemporal Variations of CH4 Diffusive Fluxes From Shrimp Aquaculture Ponds Affected by Organic Matter Supply and Aeration in Southeast China

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Large Spatial Variations in Diffusive CH₄ Fluxes from a Subtropical Coastal Reservoir Affected by Sewage Discharge in Southeast China

Large Spatial Variations in Diffusive CH₄ Fluxes from a Subtropical Coastal Reservoir Affected by Sewage Discharge in Southeast China

Patterns and Regulation of Hypolimnetic CO₂ and CH₄ in a Tropical Reservoir Using a Process‐Based Modeling Approach

Large Fine‐Scale Spatiotemporal Variations of CH₄ Diffusive Fluxes From Shrimp Aquaculture Ponds Affected by Organic Matter Supply and Aeration in Southeast China