Impact of plant species and intense nutrient loading on CH4 and N2O fluxes from small inland waters: An experimental approach

Aben, Ralf; Oliveira, Ernandes Sobreira; Carlos, Anderson Ricardo; Bergen, Tamara J. H. M. van; Lamers, Leon P. M.; Kosten, Sarian

doi:10.1016/j.aquabot.2022.103527

Cited by 12 publications

(4 citation statements)

References 49 publications

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“…Although beyond the scope of this study, we recommend incorporating CO 2 and N 2 O fluxes besides CH 4 pathways to fully capture the role of vegetated areas in the carbon and greenhouse gas balance of inland waters (see e.g., Aben et al, 2022). It is important to consider that these vegetated habitats, while generally being hotspots of CH 4 emission, may also take up and store significant amounts of carbon, and also have variable roles in terms of N 2 O dynamics; their radiative balance can therefore only be determined if a complete GHG is carried out.…”

Section: Discussionmentioning

confidence: 99%

“…ROL enables the detoxification of harmful substances (e.g., sulphide), enhances nutrient uptake, and alters the microbial community structure (Galand et al, 2005;Robroek et al, 2015). The increased O 2 availability in the rhizosphere enhances aerobic CH 4 oxidation (Aben et al, 2022). The importance of ROL in regulating CH 4 emissions is strongly dependent on plant species and developmental stage (van der Nat and Middelburg, 1998).…”

Section: Ch Oxidationmentioning

confidence: 99%

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Methane dynamics in vegetated habitats in inland waters: quantification, regulation, and global significance

Bodmer,

Vroom,

Stepina

et al. 2024

Front. Water

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Freshwater ecosystems, including lakes, wetlands, and running waters, are estimated to contribute over half the natural emissions of methane (CH4) globally, yet large uncertainties remain in the inland water CH4 budget. These are related to the highly heterogeneous nature and the complex regulation of the CH4 emission pathways, which involve diffusion, ebullition, and plant-associated transport. The latter, in particular, represents a major source of uncertainty in our understanding of inland water CH4 dynamics. Many freshwater ecosystems harbor habitats colonized by submerged and emergent plants, which transport highly variable amounts of CH4 to the atmosphere but whose presence may also profoundly influence local CH4 dynamics. Yet, CH4 dynamics of vegetated habitats and their potential contribution to emission budgets of inland waters remain understudied and poorly quantified. Here we present a synthesis of literature pertaining CH4 dynamics in vegetated habitats, and we (i) provide an overview of the different ways the presence of aquatic vegetation can influence CH4 dynamics (i.e., production, oxidation, and transport) in freshwater ecosystems, (ii) summarize the methods applied to study CH4 fluxes from vegetated habitats, and (iii) summarize the existing data on CH4 fluxes associated to different types of aquatic vegetation and vegetated habitats in inland waters. Finally, we discuss the implications of CH4 fluxes associated with aquatic vegetated habitats for current estimates of aquatic CH4 emissions at the global scale. The fluxes associated to different plant types and from vegetated areas varied widely, ranging from−8.6 to over 2835.8 mg CH4 m−2 d−1, but were on average high relative to fluxes in non-vegetated habitats. We conclude that, based on average vegetation coverage and average flux intensities of plant-associated fluxes, the exclusion of these habitats in lake CH4 balances may lead to a major underestimation of global lake CH4 emissions. This synthesis highlights the need to incorporate vegetated habitats into CH4 emission budgets from natural freshwater ecosystems and further identifies understudied research aspects and relevant future research directions.

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Section: Discussionmentioning

confidence: 99%

Section: Ch Oxidationmentioning

confidence: 99%

Methane dynamics in vegetated habitats in inland waters: quantification, regulation, and global significance

Bodmer,

Vroom,

Stepina

et al. 2024

Front. Water

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“…However, littoral GHG emissions are likely a conservative estimate since N2O, a potent GHG 1 , is not included. N2O emission is considered to be low from lakes and ponds 57,58 (i.e., 2% of total GHG emissions expressed as CO2 equivalents 57 ), but can be high in nutrient-rich freshwater wetlands 59,60 . Conversely, nutrient rich ponds with strong and persistent stratification can be N2O sinks 61 .…”

Section: Adding the Littoral Makes Lakes A C Sinkmentioning

confidence: 99%

The carbon budget of continents is strongly influenced by overlooked lake littoral zones

Grasset,

Mesman,

Tranvik

et al. 2024

Preprint

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In the littoral zone, at the land-water interface of lakes and running waters, the areal productivity of plants rivals that of rain forests, resulting in a potentially very high carbon (C) turnover. While tidal wetlands at the land-ocean interface are now included in global C budgets, littoral zones of inland waters are currently not accounted for. This is remarkable given that the total shoreline of inland waters is more than 20 times longer than that of the global ocean. Here we argue that ignoring littoral C turnover in inland waters potentially results in biased estimates of continental C cycling. By including for the first time the turnover of C fixed by aquatic plants in the littoral, we show that the estimated global C balance of lakes may reverse from a net C source to a net C sink. In addition, a large part of the C outgassed in the pelagic zone might originate from the littoral, implying that previous estimates of terrestrial C inputs to inland waters were too high. We argue that the quantification and modeling of littoral C fluxes is essential to more accurately estimate the feedbacks between the continents and climate.

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“…Finer‐scale studies have identified other drivers including shoreline fluctuations (Hondula et al., 2021; Mullen et al., 2023), nutrient concentrations (Bastviken et al., 2004), and littoral zones (Larmola et al., 2004). While having modest correlation coefficients over broad scales (e.g., r 2 < 0.3, Savignano et al., 2023), lake area and temperature are nonetheless among the most predictive of available variables (Aben et al., 2022; Bastviken et al., 2004; Sanches et al., 2019; Yvon‐Durocher et al., 2014) and a minimum requirement for upscaling lake methane emissions over large, data‐poor areas such as the pan‐Arctic.…”

Section: Introductionmentioning

confidence: 99%

A Closer Look at the Effects of Lake Area, Aquatic Vegetation, and Double‐Counted Wetlands on Pan‐Arctic Lake Methane Emissions Estimates

Kyzivat,

Smith

2023

Geophysical Research Letters

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Lake methane emissions are commonly upscaled from lake area, with recognition that smaller, non‐inventoried lakes emit more per unit area. There is also growing awareness of the importance of lake aquatic vegetation and potential “double‐counting” with wetlands, but lack of consensus on which is most impactful. Here, we combine high‐resolution data with the comprehensive lake inventory HydroLAKES to rank these three variables based on emissions sensitivity. Including non‐inventoried small lakes <0.1 km2 (+30 [range: 9.0 to 82]% change) is greatest, followed by double‐counting (−20 [−11 to −34]%) and lake aquatic vegetation (+14 [2.7 to 43]%). Significantly, emissions from non‐inventoried lakes contribute far less than the ∼40% previously determined globally through statistical area extrapolation. We produce a first pan‐Arctic estimate of lake aquatic vegetation in 1.37 million km2 of lakes, but after correcting for persistent double‐counting, its net effect is to decrease emissions estimates by 9%. Thus, previous global emissions estimates are likely too high.

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Impact of plant species and intense nutrient loading on CH4 and N2O fluxes from small inland waters: An experimental approach

Cited by 12 publications

References 49 publications

Methane dynamics in vegetated habitats in inland waters: quantification, regulation, and global significance

Methane dynamics in vegetated habitats in inland waters: quantification, regulation, and global significance

The carbon budget of continents is strongly influenced by overlooked lake littoral zones

A Closer Look at the Effects of Lake Area, Aquatic Vegetation, and Double‐Counted Wetlands on Pan‐Arctic Lake Methane Emissions Estimates

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