Influence of Hydrological Perturbations and Riverbed Sediment Characteristics on Hyporheic Zone Respiration of CO2 and N2

Newcomer, Michelle E.; Hubbard, Susan S.; Fleckenstein, Jan H.; Maier, Ulrich; Schmidt, Christian; Thullner, Martin; Ulrich, Craig; Flipo, Nicolas; Rubin, Yoram

doi:10.1002/2017JG004090

Title: Influence of Hydrological Perturbations and Riverbed Sediment Characteristics on Hyporheic Zone Respiration of CO₂ and N₂

Journal Article · 22 February 2018 · Journal of Geophysical Research. Biogeosciences

DOI: https://doi.org/10.1002/2017JG004090 · OSTI ID:1561881

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Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Climate and Ecosystem Sciences Division
Helmholtz-Centre for Environmental Research (UFZ), Leipzig (Germany). Dept. of Hydrogeology
Univ. of Göttingen, Göttingen (Germany). Geoscience Centre, Dept. of Applied Geology
Helmholtz-Centre for Environmental Research (UFZ), Leipzig (Germany). Dept. of Environmental Microbiology
MINES ParisTech, PSL Research Univ., Paris (France). Geosciences Dept.
Univ. of California, Berkeley, CA (United States). Dept. of Civil and Environmental Engineering

Rivers in climatic zones characterized by dry and wet seasons often experience periodic transitions between losing and gaining conditions across the river-aquifer continuum. Infiltration shifts can stimulate hyporheic microbial biomass growth and cycling of riverine carbon and nitrogen leading to major exports of biogenic CO₂ and N₂ to rivers. In this study, we develop and test a numerical model that simulates biological-physical feedback in the hyporheic zone. We used the model to explore different initial conditions in terms of dissolved organic carbon availability, sediment characteristics, and stochastic variability in aerobic and anaerobic conditions from water table fluctuations. Our results show that while highly losing rivers have greater hyporheic CO₂ and N₂ production, gaining rivers allowed the greatest fraction of CO₂ and N₂ production to return to the river. Hyporheic aerobic respiration and denitrification contributed 0.1–2 g/m²/d of CO₂ and 0.01–0.2 g/m²/d of N₂; however, the suite of potential microbial behaviors varied greatly among sediment characteristics. We found that losing rivers that consistently lacked an exit pathway can store up to 100% of the entering C/N as subsurface biomass and dissolved gas. Finally, our results demonstrate the importance of subsurface feedbacks whereby microbes and hydrology jointly control fate of C and N and are strongly linked to wet-season control of initial sediment conditions and hydrologic control of seepage direction. These results provide a new understanding of hydrobiological and sediment-based controls on hyporheic zone respiration, including a new explanation for the occurrence of anoxic microzones and large denitrification rates in gravelly riverbeds.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1561881

Journal Information:: Journal of Geophysical Research. Biogeosciences, Vol. 123, Issue 3; ISSN 2169-8953

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 45 works

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