Carbon fluxes in subtropical shallow lakes: contrasting regimes differ in CH4 emissions

Abstract

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Shallow lakes under alternative states differ in the dominant greenhouse gas emission pathways

“…In contrast, lower values were reported for an Amazon floodplain, including areas of OW, colonized by floating macrophytes and of flooded forest, although there were no differences in CH 4 diffusive flux between habitats (0.04–0.97 mmol m −2 d −1 , Barbosa et al 2020). Lower values were also reported for a shallow boreal lake, including areas of OW, submerged and emergent vegetation (0.24–1.1 mmol m −2 d −1 , Desrosiers et al 2022), yet much higher values were reported for littoral and pelagic areas of clear and turbid shallow lakes of Uruguay (61.3–270.7 mmol m −2 d −1 , Colina et al 2021). CH 4 ebullitive flux ranged from 0.27 mmol m −2 d −1 in winter up to 27.7 mmol m −2 d −1 in summer, with an annual mean of 4.7 ± 7.5 mmol m −2 d −1 .…”

“…CH 4 ebullitive flux ranged from 0.27 mmol m −2 d −1 in winter up to 27.7 mmol m −2 d −1 in summer, with an annual mean of 4.7 ± 7.5 mmol m −2 d −1 . A similar annual mean was found for boreal ponds (4.6 ± 4.1 mmol m −2 d −1 , DelSontro et al 2016), for an Australian subtropical wetland (5.5 ± 9.7 mmol m −2 d −1 ; Jeffrey et al 2019 a ), for the littoral zone of a clear shallow lake and for the pelagic zone of a turbid shallow lake from Uruguay (5.0 ± 0.2 and 3.6 ± 0.2 mmol m −2 d −1 , respectively; Colina et al 2021). Yet, a lower mean was reported for a set of Brazilian water bodies (1.1 ± 2.4 mmol m −2 d −1 ; Oliveira Junior et al 2021), for an Amazon floodplain (1.1 ± 2.6 mmol m −2 d −1 ; Barbosa et al 2020) and for the unvegetated littoral of a shallow boreal lake (1.84 ± 2.6 mmol m −2 d −1 , Desrosiers et al 2022), although Desrosiers et al (2022) also reported higher means in the areas colonized by the emergent macrophyte Typha latifolia and submerged macrophyte Brasenia schreberi (6.81 ± 10.8 and 15.9 ± 18.9 mmol m −2 d −1 , respectively).…”

Preface: advances in the ecology of shallow lakes

“…There are several studies of carbon dioxide (CO 2 ) and methane (CH 4 ) fluxes in shallow lakes, showing strong variation depending on the dominant primary producers, but subtropical systems are understudied. Colina et al ( 2022 ) compared summer CO 2 and CH 4 fluxes (diffusion and ebullition) in littoral and pelagic zones of three subtropical shallow lakes with contrasting states (clear to turbid). Significant differences among the lakes only occurred for CH 4 fluxes.…”

The Influence of Seasonal Variability of Eutrophication Indicators on Carbon Dioxide and Methane Diffusive Emissions in the Largest Shallow Urban Lake in China

“…Urban lakes (normally with a mean depth of less than 3 m) are commonly shallow [12,13] and are indispensable components of landscape features and urban living environments [14,15]. Urban lakes have a vulnerability to a host of anthropogenic and environmental pressures and possess a poor capacity for self-purification [16]. Human activities, for instance, discharges of wastewater, can enhance loadings of organic carbon and nutrients in urban lakes, which can stimulate mineralization and thus promote methanogenesis [17].…”