Peatland Dissolved Organic Carbon Export to Surface Waters: Global Significance and Effects of Anthropogenic Disturbance

Rosset, Thomas; Binet, Stéphane; Rigal, François; Gandois, Laure

doi:10.1029/2021gl096616

Cited by 20 publications

(18 citation statements)

References 84 publications

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“…We can also compare to a metadata analysis on peatland DOC export by Rosset et al. (2022) and find our DOC oxidation rate is on the same order of magnitude as the median tropical DOC export rate. Furthermore, our results indicate a substantial difference in the rate of DOC oxidation between January and August 2020.…”

Section: Resultssupporting

confidence: 55%

“…As a rough check on the DOC oxidation rate, we compare it to the rate of total organic carbon fluvial export from drainage canals in Malaysia (Cook et al, 2018) and find that our DOC oxidation rates fall on the same order of magnitude and below (9%-65%) TOC export from that study. We can also compare to a metadata analysis on peatland DOC export by Rosset et al (2022) and find our DOC oxidation rate is on the same order of magnitude as the median tropical DOC export rate. Furthermore, our results indicate a substantial difference in the rate of DOC oxidation between January and August 2020.…”

Section: Methane Oxidation In Canal Dominates Over Emissionmentioning

confidence: 78%

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Processes Controlling Methane Emissions From a Tropical Peatland Drainage Canal

et al. 2023

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Most peat domes in Southeast Asia are crisscrossed by networks of drainage canals. These canals are a potentially important source of methane to the atmosphere because the groundwater that discharges into them carries high concentrations of dissolved methane that is produced within peat. In this study, we present an isotope‐enabled numerical model that simulates transport, degassing, and oxidation of methane and dissolved inorganic carbon (DIC) along a drainage canal. We then estimate methane fluxes through a 5‐km canal that crosses a disturbed, forested, but undeveloped, peat dome in Brunei Darussalam by applying this model to field data: concentrations and stable carbon isotopic ratios of both methane and dissolved inorganic carbon from both peat porewater and canal water. We estimate that approximately 70% of the methane entering the canal is oxidized within the canal, 26% is degassed to the atmosphere, and 4% is transported toward the ocean, under low to moderate flow conditions. The flux of methane to the atmosphere is lowest at the maximum elevation of the canal, where flow is stagnant and methane concentrations are highest. Downstream, as flow velocity increases, methane emissions plateau even as methane concentrations decrease. The resulting methane emissions from the canal are large compared to emissions from the peat surface and vegetation on a per‐area basis. However, since the canal covers only a small portion of the catchment area, the canal may be a substantial but not dominant source of methane from the peatland.

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Section: Resultssupporting

confidence: 55%

Section: Methane Oxidation In Canal Dominates Over Emissionmentioning

confidence: 78%

Processes Controlling Methane Emissions From a Tropical Peatland Drainage Canal

et al. 2023

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“…These patterns in pool biogeochemistry followed gradients in peatland structure that also correlate with increases or decreases in climate properties. For example, warmer MAT favors greater DOC export from peatlands (Rosset et al, 2022) because of changes in vegetation composition and increased decomposition rates (Dieleman et al, 2015(Dieleman et al, , 2016. A lowered water table under warmer and drier climates also stimulates the production of DOC (Strack et al, 2008) and CO 2 (Huang et al, 2021) in the upper layer of the peat profile by exposing labile C to newly created aerobic conditions.…”

Section: The Broad-and Small-scale Influence Of Climatementioning

confidence: 99%

Climate‐driven spatial and temporal patterns in peatland pool biogeochemistry

Arsenault

Talbot

Brown

et al. 2023

Global Change Biology

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Peatland pools are freshwater bodies that are highly dynamic aquatic ecosystems because of their small size and their development in organic-rich sediments. However, our ability to understand and predict their contribution to both local and global biogeochemical cycles under rapidly occurring environmental change is limited because the spatiotemporal drivers of their biogeochemical patterns and processes are poorly understood. We used (1) pool biogeochemical data from 20 peatlands in eastern Canada, the United Kingdom, and southern Patagonia and (2) multi-year data from an undisturbed peatland of eastern Canada, to determine how climate and terrain features drive the production, delivering and processing of carbon (C), nitrogen (N), and phosphorus (P) in peatland pools. Across sites, climate (24%) and terrain (13%) explained distinct portions of the variation in pool biogeochemistry, with climate driving spatial differences in pool dissolved organic C (DOC) concentration and aromaticity.Within the multi-year dataset, DOC, carbon dioxide (CO 2 ), total N concentrations, and DOC aromaticity were highest in the shallowest pools and at the end of the growing seasons, and increased gradually from 2016 to 2021 in relation to a combination of increases in summer precipitation, mean air temperature for the previous fall, and number of extreme summer heat days. Given the contrasting effects of terrain and climate, broad-scale terrain characteristics may offer a baseline for the prediction of | 4057 ARSENAULT et al.

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“…Changing precipitation pattern, increasing temperature and decreasing snowpack are expected to contribute to more frequent extreme events like droughts and torrential rains, resulting in increased vulnerability and interannual variability (Alm et al 1999 ; Drollinger et al 2019 ). In addition, it is also important to consider the potential substantial losses of dissolved and particulate C from drained and restored peatlands when estimating C budgets (Billett et al 2010 ; Rosset et al 2022 ).…”

Section: Introductionmentioning

confidence: 99%

Peatland restoration pathways to mitigate greenhouse gas emissions and retain peat carbon

Mander,

Espenberg,

Melling

et al. 2023

Biogeochemistry

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Peatlands play a crucial role in the global carbon (C) cycle, making their restoration a key strategy for mitigating greenhouse gas (GHG) emissions and retaining C. This study analyses the most common restoration pathways employed in boreal and temperate peatlands, potentially applicable in tropical peat swamp forests. Our analysis focuses on the GHG emissions and C retention potential of the restoration measures. To assess the C stock change in restored (rewetted) peatlands and afforested peatlands with continuous drainage, we adopt a conceptual approach that considers short-term C capture (GHG exchange between the atmosphere and the peatland ecosystem) and long-term C sequestration in peat. The primary criterion of our conceptual model is the capacity of restoration measures to capture C and reduce GHG emissions. Our findings indicate that carbon dioxide (CO2) is the most influential part of long-term climate impact of restored peatlands, whereas moderate methane (CH4) emissions and low N2O fluxes are relatively unimportant. However, lateral losses of dissolved and particulate C in water can account up to a half of the total C stock change. Among the restored peatland types, Sphagnum paludiculture showed the highest CO2 capture, followed by shallow lakes and reed/grass paludiculture. Shallow lakeshore vegetation in restored peatlands can reduce CO2 emissions and sequester C but still emit CH4, particularly during the first 20 years after restoration. Our conceptual modelling approach reveals that over a 300-year period, under stable climate conditions, drained bog forests can lose up to 50% of initial C content. In managed (regularly harvested) and continuously drained peatland forests, C accumulation in biomass and litter input does not compensate C losses from peat. In contrast, rewetted unmanaged peatland forests are turning into a persistent C sink. The modelling results emphasized the importance of long-term C balance analysis which considers soil C accumulation, moving beyond the short-term C cycling between vegetation and the atmosphere.

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Peatland Dissolved Organic Carbon Export to Surface Waters: Global Significance and Effects of Anthropogenic Disturbance

Cited by 20 publications

References 84 publications

Processes Controlling Methane Emissions From a Tropical Peatland Drainage Canal

Processes Controlling Methane Emissions From a Tropical Peatland Drainage Canal

Climate‐driven spatial and temporal patterns in peatland pool biogeochemistry

Peatland restoration pathways to mitigate greenhouse gas emissions and retain peat carbon

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