Short-term effects of macrophyte removal on emission of CO2 and CH4 in shallow lakes

Harpenslager, Sarah F.; Thiemer, Kirstine; Levertz, C.; Misteli, Benjamin; Sebola, Keneilwe; Schneider, Susanne C.; Hilt, Sabine; Köhler, Jan

doi:10.1016/j.aquabot.2022.103555

Cited by 11 publications

(15 citation statements)

References 42 publications

(51 reference statements)

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“…CH 4 diffusive flux was also negatively correlated with DO (Figure S6b in Supporting Information S1), suggesting that CH 4 oxidation decreased and/or water column CH 4 production increased. Several studies have reported higher CH 4 emissions from sites with submersed vegetation than non-vegetated sites, with similar observations of low water column DO concentration and the accumulation of plant-deprived OM at the sediment surface (Cronin et al, 2006;Harpenslager et al, 2022;Zhang et al, 2019).…”

Section: Water Column Ghg Concentrations and Fluxessupporting

confidence: 58%

“…CO 2 flux was constant in the no plant controls, indicating that changes in C. demersum growth and activity likely explained changes in CO 2 flux. Interestingly, CO 2 diffusive flux began to decrease before CO 2 surface concentration decreased in the medium density treatment which suggests that C. demersum photosynthetic activity began fixing more CO 2 (Harpenslager et al, 2022). Early C. demersum die-off coupled with competition may help explain the early, high CH 4 concentrations and fluxes occurring in high density treatments.…”

Section: Submersed Macrophyte Phenology Influences Ghgsmentioning

confidence: 95%

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Submersed Macrophyte Density Regulates Aquatic Greenhouse Gas Emissions

Theus,

Ray,

Bansal

et al. 2023

JGR Biogeosciences

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Shallow freshwater ecosystems emit large amounts of greenhouse gases (GHGs), such as carbon dioxide (CO2) and methane (CH4), yet emissions are highly variable. The role that aquatic macrophytes play in regulating aquatic GHG emissions is uncertain despite their ability to dominate shallow waterbodies. Here, we studied the effects of submersed macrophyte (Ceratophyllum demersum) density on CO2 and CH4 concentrations and fluxes. We conducted a 61‐days experiment using mesocosms containing one of the following C. demersum density treatments: 0, 10, 20, or 30 individual shoots (n = 3). We found that high density C. demersum had the highest CO2 and CH4 surface water concentrations and emissions while there was no significant difference in CH4 in the low and medium densities and no plant control. The high density treatment lost biomass over the course of the experiment, indicating die‐off and additions of organic matter to the sediment. High organic matter loading and low dissolved oxygen likely stimulated GHG production in the high density treatment. Our results emphasize that submersed macrophyte density and periods of growth and dieback are important in regulating GHG emissions, which may help explain why shallow waterbodies are high yet variable sources of GHGs to the atmosphere.

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Section: Water Column Ghg Concentrations and Fluxessupporting

confidence: 58%

Section: Submersed Macrophyte Phenology Influences Ghgsmentioning

confidence: 95%

Submersed Macrophyte Density Regulates Aquatic Greenhouse Gas Emissions

Theus,

Ray,

Bansal

et al. 2023

JGR Biogeosciences

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“…2). In an experiment with sediment and lake water in bottles that were incubated in the dark for 20 h, the addition of submerged macrophyte biomass ( Elodea nuttallii ) doubled the potential CH 4 production rates (Harpenslager et al In press) and direct CH 4 production by the macrophytes is a potential explanation.…”

Section: Potential Of Submerged Macrophytes For Ompmentioning

confidence: 99%

Potential role of submerged macrophytes for oxic methane production in aquatic ecosystems

Hilt

Grossart

Mcginnis

et al. 2022

Limnology & Oceanography

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Methane (CH4) from aquatic ecosystems contributes to about half of total global CH4 emissions to the atmosphere. Until recently, aquatic biogenic CH4 production was exclusively attributed to methanogenic archaea living under anoxic or suboxic conditions in sediments, bottom waters, and wetlands. However, evidence for oxic CH4 production (OMP) in freshwater, brackish, and marine habitats is increasing. Possible sources were found to be driven by various planktonic organisms supporting different OMP mechanisms. Surprisingly, submerged macrophytes have been fully ignored in studies on OMP, yet they are key components of littoral zones of ponds, lakes, and coastal systems. High CH4 concentrations in these zones have been attributed to organic substrate production promoting classic methanogenesis in the absence of oxygen. Here, we review existing studies and argue that, similar to terrestrial plants and phytoplankton, macroalgae and submerged macrophytes may directly or indirectly contribute to CH4 formation in oxic waters. We propose several potential direct and indirect mechanisms: (1) direct production of CH4; (2) production of CH4 precursors and facilitation of their bacterial breakdown or chemical conversion; (3) facilitation of classic methanogenesis; and (4) facilitation of CH4 ebullition. As submerged macrophytes occur in many freshwater and marine habitats, they are important in global carbon budgets and can strongly vary in their abundance due to seasonal and boom‐bust dynamics. Knowledge on their contribution to OMP is therefore essential to gain a better understanding of spatial and temporal dynamics of CH4 emissions and thus to substantially reduce current uncertainties when estimating global CH4 emissions from aquatic ecosystems.

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“…13,14,16 Previous studies mainly focused on the effect of natural emergent plants on CH 4 emission from wetlands or lakes. 17,18 To the best of our knowledge, no experiment has been conducted to determine the effect of emergent plants on CH 4 emission from aquaculture ponds. Rice is the staple food in main aquaculture countries, including China, India, and Bangladesh.…”

Section: Introductionmentioning

confidence: 99%

“…Some studies also showed that the rhizospheric CH 4 oxidation induced by emergent aquatic plants was beneficial to reduce CH 4 emission from the sediment. , However, the root exudates of emergent plants provide substrate carbon (C) for methanogenesis and may increase CH 4 emission . The overall effect of emergent plants on CH 4 emission, whether decrease or increase, was highly dependent on the plant species and the aquatic environment. ,, Previous studies mainly focused on the effect of natural emergent plants on CH 4 emission from wetlands or lakes. , To the best of our knowledge, no experiment has been conducted to determine the effect of emergent plants on CH 4 emission from aquaculture ponds.…”

Section: Introductionmentioning

confidence: 99%

Higher Food Yields and Lower Greenhouse Gas Emissions from Aquaculture Ponds with High-Stalk Rice Planted

Qian

Yang

et al. 2023

Environ. Sci. Technol.

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Aquaculture ponds are an important artificial aquatic system for global food fish production but also are a hot spot of greenhouse gas (GHG) emissions. The GHG mitigation strategy and the underlying mechanism for aquaculture ponds are still poorly understood. In this study, we conducted a 2 year field experiment to determine the effects of planting high-stalk rice (an artificially bred emergent plant for ponds) on GHG emissions from aquaculture ponds. Our results showed that planting high-stalk rice reduced CH 4 emission by 64.4% and N 2 O emission by 76.2% over 2 years. Planting high-stalk rice significantly increased the content of O 2 and the abundance of pmoA in the sediment, thus prompting CH 4 oxidation in the ponds. The reduction of N 2 O emission from ponds was attributed to the decreased inorganic nitrogen, amoA-B and nirS in the sediment induced by rice. Furthermore, high-stalk rice culture in the pond increased shrimp yields and gained rice yields, resulting in a significant reduction of yield-scaled global warming potential. Our findings suggest that breeding appropriate emergent aquatic plants is a potential pathway to mitigate GHG emission from aquaculture ponds with more food yields and economic benefits.

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Short-term effects of macrophyte removal on emission of CO2 and CH4 in shallow lakes

Cited by 11 publications

References 42 publications

Submersed Macrophyte Density Regulates Aquatic Greenhouse Gas Emissions

Submersed Macrophyte Density Regulates Aquatic Greenhouse Gas Emissions

Potential role of submerged macrophytes for oxic methane production in aquatic ecosystems

Higher Food Yields and Lower Greenhouse Gas Emissions from Aquaculture Ponds with High-Stalk Rice Planted

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