Biogeochemistry of Wetland Carbon Preservation and Flux

Neubauer, Scott C.; Megonigal, J. Patrick

doi:10.1002/9781119639305.ch3

Cited by 18 publications

(11 citation statements)

References 600 publications

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“…For instance, methane (CH 4 ) emission rates and processes are highly variable and still poorly documented (Rosentreter et al., 2021). The driving forces are unclear although anoxic conditions, presence (or absence) of sulfides and salinity have been identified to influence the release of CO 2 and CH 4 (Neubauer & Megonigal, 2022). Tidal pumping is another mechanism that influences the mangrove carbon budget (Maher et al., 2018; Santos et al., 2021) that may vary with hydrogeomorphic settings.…”

Section: Coastal Environmental Settings Can Help Refine Other Key Com...mentioning

confidence: 99%

Going Local: How Coastal Environmental Settings Can Help Improve Global Mangrove Carbon Storage and Flux Estimates

Taillardat

2022

Geophysical Research Letters

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The magnitude and variability of mangrove carbon storage are uncertain and still being discussed. In a recent article, Breithaupt and Steinmuller (2022, https://doi.org/10.1029/2022GL100177) completed a literature review and compared mangrove organic carbon burial rates between different coastal environmental settings (CES) that integrate sedimentary supply (terrigenous vs. carbonate) and hydrogeomorphic settings (delta, estuary, lagoon, open coast). They found greater burial rates in terrigenous delta and estuaries while lower rates were reported in lagoons and carbonate settings. Surprisingly, these CES relationships do not strictly match previous mangrove soil carbon stock estimates but were consistent with biomass stocks. The CES approach used by Breithaupt and Steinmuller should be used for other mangrove carbon stocks and fluxes estimates to refine our understanding of mangrove carbon cycling and storage.

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Section: Coastal Environmental Settings Can Help Refine Other Key Com...mentioning

confidence: 99%

Going Local: How Coastal Environmental Settings Can Help Improve Global Mangrove Carbon Storage and Flux Estimates

Taillardat

2022

Geophysical Research Letters

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“…In addition to the terrestrial ecosystem–atmosphere exchange of C, the aquatic C export via discharge may represent another important but often overlooked component of the boreal peatland C cycle (Cole et al., 2007; Nilsson et al., 2008). Aquatic C fluxes in the form of dissolved organic C (DOC) and dissolved inorganic C (DIC; including dissolved CO 2 and CH 4 ) are strongly coupled with vegetation structure and hydrological regime (Moore, 2003; Neubauer & Megonigal, 2021) and thus subject to change following drainage (Evans et al., 2016; Nieminen et al., 2021). However, while the aquatic C loss has been integrated with terrestrial fluxes to estimate the net ecosystem carbon balance (NECB; Chapin et al., 2006) for natural mires (Koehler et al., 2011; Nilsson et al., 2008; Roulet et al., 2007), such holistic assessment of the NECB has not been conducted for boreal drained peatland forests.…”

Section: Introductionmentioning

confidence: 99%

A drained nutrient‐poor peatland forest in boreal Sweden constitutes a net carbon sink after integrating terrestrial and aquatic fluxes

Tong,

Noumonvi,

Ratcliffe

et al. 2024

Global Change Biology

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Northern peatlands provide a globally important carbon (C) store. Since the beginning of the 20th century, however, large areas of natural peatlands have been drained for biomass production across Fennoscandia. Today, drained peatland forests constitute a common feature of the managed boreal landscape, yet their ecosystem C balance and associated climate impact are not well understood, particularly within the nutrient‐poor boreal region. In this study, we estimated the net ecosystem carbon balance (NECB) from a nutrient‐poor drained peatland forest and an adjacent natural mire in northern Sweden by integrating terrestrial carbon dioxide (CO2) and methane (CH4) fluxes with aquatic losses of dissolved organic C (DOC) and inorganic C based on eddy covariance and stream discharge measurements, respectively, over two hydrological years. Since the forest included a dense spruce‐birch area and a sparse pine area, we were able to further evaluate the effect of contrasting forest structure on the NECB and component fluxes. We found that the drained peatland forest was a net C sink with a 2‐year mean NECB of −115 ± 5 g C m−2 year−1 while the adjacent mire was close to C neutral with 14.6 ± 1.7 g C m−2 year−1. The NECB of the drained peatland forest was dominated by the net CO2 exchange (net ecosystem exchange [NEE]), whereas NEE and DOC export fluxes contributed equally to the mire NECB. We further found that the C sink strength in the sparse pine forest area (−153 ± 8 g C m−2 year−1) was about 1.5 times as high as in the dense spruce‐birch forest area (−95 ± 8 g C m−2 year−1) due to enhanced C uptake by ground vegetation and lower DOC export. Our study suggests that historically drained peatland forests in nutrient‐poor boreal regions may provide a significant net ecosystem C sink and associated climate benefits.

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“…The OM that is not consumed or decomposed (recalcitrant fraction) accumulates in the soil pool, contributing to the storage of blue C (Chmura et al, 2003) that can accrete vertically over time under anoxic conditions (Morris et al, 2002). For example, root growth and sediment binding dynamics drive accumulation of coastal wetland C belowground, but loss of C via decomposition can offset these gains (Cahoon et al, 2021; Neubauer & Megonigal, 2021; Spivak et al, 2019). Redox conditions are the primary driver of OM decomposition in terrestrial systems, but under low‐oxygen conditions and where tides can introduce molecular oxygen, such as in temperate and tropical coastal wetlands, it may be less important for microbial C processing and other drivers may increasingly come into play (Chapman et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Do global change variables alter mangrove decomposition? A systematic review

Simpson,

Chapman,

Simpson

et al. 2023

Global Ecol Biogeogr

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AimGlobal change is expected to modify the magnitude and trajectory of organic matter decomposition in mangrove ecosystems. Yet, the degree and direction of that change is unknown, especially considering the large C storage potential that mangroves provide. We performed a systematic review of primary literature to examine the relationships between genus‐specific litter quality, latitude or other global change proxies and decomposition of mangrove litter fractions.LocationGlobal.Time Period1976–2021.TaxonMangroves.MethodsWe compiled a dataset of 480 decomposition rates, including species, litter fraction, latitude, and relevant biophysical data. We investigated the influence of genera, tissue type, latitude, and global change proxies on decomposition rates using linear models and qualitative approaches. We also performed calculations to determine the potential importance of the decomposition process on the root litter biomass C pool in the context of blue C significance.ResultsCollectively, latitudinal relationships suggest that factors other than temperature, such as tissue type and genus, may regulate decay rates within mangroves' distributional range. Decay rates of leaf litter, roots, and wood converged on a value of 0.009 ± 0.0005, 0.002 ± 0.0001, and 0.001 ± 0.0003, respectively, across continents and geomorphological settings. Our calculations suggest that small changes in decomposition rate will not elicit large changes in blue C storage potential.ConclusionsThe main drivers behind variability in mangrove biomass decay rates detected across the distributional range remain uncertain. However, the small latitudinal range that mangroves inhabit and the submerged environment within which litter decomposes suggest that decay depends on species‐specific responses or biotic interactions among species to global change drivers. Few studies have examined global change impacts directly, and variability in decay and lack of representation of some mangrove groups in the literature suggest that implications for blue C are important to consider.

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Biogeochemistry of Wetland Carbon Preservation and Flux

Cited by 18 publications

References 600 publications

Going Local: How Coastal Environmental Settings Can Help Improve Global Mangrove Carbon Storage and Flux Estimates

Going Local: How Coastal Environmental Settings Can Help Improve Global Mangrove Carbon Storage and Flux Estimates

A drained nutrient‐poor peatland forest in boreal Sweden constitutes a net carbon sink after integrating terrestrial and aquatic fluxes

Do global change variables alter mangrove decomposition? A systematic review

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