Quantifying Carbon Cycling across the Groundwater–Stream–Atmosphere Continuum Using High-Resolution Time Series of Multiple Dissolved Gases

Wang, Chuan; Brennwald, Matthias S.; Xie, Yueqing; McCallum, James L.; Kipfer, Rolf; Dai, Xin; Wu, Jichun

doi:10.1021/acs.est.3c03378

Cited by 16 publications

(1 citation statement)

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“…It is noteworthy that the organic‐rich riparian aquifer could also deliver dissolved organic matter into the riverbeds by lateral groundwater discharge flow (Wang et al., 2023). Disentangling the contributions of different sources, such as surface water and lateral groundwater exchange, to the autochthonous organic matter in sediments remains a major challenge in HZ biogeochemistry.…”

Section: Implications For Riverbed Biogeochemical Cyclingmentioning

confidence: 99%

Heterogeneity in Permeability and Particulate Organic Carbon Content Controls the Redox Condition of Riverbed Sediments at Different Timescales

Chen,

Guo,

Zhan

et al. 2024

Geophysical Research Letters

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The hydrological and biogeochemical properties of the hyporheic zone in stream and riverine ecosystems have been extensively studied over the past two decades. Although it is widely acknowledged that sediment heterogeneity can influence biogeochemical reactions, little effort has been made to understand the role of heterogeneity on the spatiotemporal variability of riverbed redox conditions under changing flow dynamics at different timescales. Here we integrate a mechanistic model and field data to demonstrate that heterogeneity in permeability plays a vital role in modulating sediment redox conditions at both seasonal (annual) and event (daily‐to‐weekly) timescales, whereas heterogeneity in particulate organic carbon (POC) content only has a comparable influence on redox conditions at the seasonal timescale. These findings underscore the importance of accurately characterizing sediment heterogeneity, in terms of permeability and POC content, in quantifying biogeochemical dynamics in the riverbed and hyporheic zones of riverine ecosystems.

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Section: Implications For Riverbed Biogeochemical Cyclingmentioning

confidence: 99%