Comprehensive multiyear carbon budget of a temperate headwater stream

Argerich, A.; Haggerty, R.; Johnson, Sherri L.; Wondzell, Steven M.; Dosch, N.; Corson-rikert, H.; Ashkenas, Linda R.; Pennington, Robert S.; Thomas, Christoph

doi:10.1002/2015jg003050

Cited by 45 publications

(38 citation statements)

References 49 publications

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“…Instead, we argue the long-term integration of the nitrogen, carbon, and phosphorous cycles in the system appears to be at approximately steady-state under the diel hydrologic forcing of flows in the stream. This interpretation is consistent with past studies in the same watershed, which concluded that biological limitations are the primary control on nutrient cycling during low flows [115].…”

Section: Rru Production Does Not Appear To Change With Dischargesupporting

confidence: 93%

Solute Transport and Transformation in an Intermittent, Headwater Mountain Stream with Diurnal Discharge Fluctuations

Ward

Kurz

Schmadel

et al. 2019

Water

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P.J.B.); J.Drummond@bham.ac.uk (J.D.D.); D.M.HANNAH@bham.ac.uk (D.M.H.); S.Krause@bham.ac.uk (S.K.); a.m.milner@bham.ac.uk (A.M.)Abstract: Time-variable discharge is known to control both transport and transformation of solutes in the river corridor. Still, few studies consider the interactions of transport and transformation together. Here, we consider how diurnal discharge fluctuations in an intermittent, headwater stream control reach-scale solute transport and transformation as measured with conservative and reactive tracers during a period of no precipitation. One common conceptual model is that extended contact times with hyporheic zones during low discharge conditions allows for increased transformation of reactive solutes. Instead, we found tracer timescales within the reach were related to discharge, described by a single discharge-variable StorAge Selection function. We found that Resazurin to Resorufin (Raz-to-Rru) transformation is static in time, and apparent differences in reactive tracer were due to interactions with different ages of storage, not with time-variable reactivity. Overall we found reactivity was highest in youngest storage locations, with minimal Raz-to-Rru conversion in waters older than about 20 h of storage in our study reach. Therefore, not all storage in the study reach has the same potential biogeochemical function and increasing residence time of solute storage does not necessarily increase reaction potential of that solute, contrary to prevailing expectations.

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Section: Rru Production Does Not Appear To Change With Dischargesupporting

confidence: 93%

Solute Transport and Transformation in an Intermittent, Headwater Mountain Stream with Diurnal Discharge Fluctuations

Ward

Kurz

Schmadel

et al. 2019

Water

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“…Second, hyporheic exchange provides a mechanism to transport CO 2 from the floodplain to the stream where it can be evaded to the atmosphere or transported downstream. Estimates for WS1 suggest that these hyporheic processes account for 24% of the carbon exported from the watershed [ Argerich et al ., ].…”

Section: Discussionmentioning

confidence: 99%

Carbon dynamics in the hyporheic zone of a headwater mountain stream in the Cascade Mountains, Oregon

et al. 2016

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We investigated carbon dynamics in the hyporheic zone of a steep, forested, headwater catchment western Oregon, USA. Water samples were collected monthly from the stream and a well network during base flow periods. We examined the potential for mixing of different source waters to explain concentrations of DOC and DIC. We did not find convincing evidence that either inputs of deep groundwater or lateral inputs of shallow soil water influenced carbon dynamics. Rather, carbon dynamics appeared to be controlled by local processes in the hyporheic zone and overlying riparian soils. DOC concentrations were low in stream water (0.04–0.09 mM), and decreased with nominal travel time through the hyporheic zone (0.02–0.04 mM lost over 100 h). Conversely, stream water DIC concentrations were much greater than DOC (0.35–0.7 mM) and increased with nominal travel time through the hyporheic zone (0.2–0.4 mM gained over 100 h). DOC in stream water could only account for 10% of the observed increase in DIC. In situ metabolic processing of buried particulate organic matter as well as advection of CO2 from the vadose zone likely accounted for the remaining 90% of the increase in DIC. Overall, the hyporheic zone was a source of DIC to the stream. We suggest that, in mountain stream networks, hyporheic exchange facilitates the transformation of particulate organic carbon buried in floodplains and transports the DIC that is produced back to the stream where it can be evaded to the atmosphere.

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“…For hyporheic systems that are subject to episodic nutrient replenishment (e.g., autumnal leaf fall), one would expect that nutrient levels (primarily organic carbon) would change over time, decreasing between replenishment events. Several studies have demonstrated a positive relationship between nutrient concentrations and bioactivity levels (e.g., Argerich et al, ; Harvey et al, ; Hunter et al, ; Sobczak & Findlay, ; Suberkropp, ; Zarnetske et al, ). This idea has also been presented, at least as a theoretical construct, in a number of numerical studies (see e.g., Bardini et al, ; Kessler et al, ; Marzadri et al, ; Rutherford et al, ; Wriedt & Rode, ; Zarnetske et al, ).…”

Section: Introductionmentioning

confidence: 99%

Spatial and Temporal Dynamics of Dissolved Oxygen Concentrations and Bioactivity in the Hyporheic Zone

Reeder

Quick

Farrell

et al. 2018

Water Resources Research

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Dissolved oxygen (DO) concentrations and consumption rates are primary indicators of heterotrophic respiration and redox conditions in the hyporheic zone (HZ). Due to the complexity of hyporheic flow and interactions between hyporheic hydraulics and the biogeochemical processes, a detailed, mechanistic, and predictive understanding of the biogeochemical activity in the HZ has not yet been developed. Previous studies of microbial activity in the HZ have treated the metabolic DO consumption rate constant (KDO) as a temporally fixed and spatially homogeneous property that is determined primarily by the concentration of bioavailable carbon. These studies have generally treated bioactivity as temporally steady state, failing to capture the temporal dynamics of a changeable system. We demonstrate that hyporheic hydraulics controls rate constants in a hyporheic system that is relatively abundant in bioavailable carbon, such that KDO is a linear function of the local downwelling flux. We further demonstrate that, for triangular dunes, the downwelling velocities are lognormally distributed, as are the KDO values. By comparing measured and modeled DO profiles, we demonstrate that treating KDO as a function of the downwelling flux yields a significant improvement in the accuracy of predicted DO profiles. Additionally, our results demonstrate the temporal effect of carbon consumption on microbial respiration rates.

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Comprehensive multiyear carbon budget of a temperate headwater stream

Cited by 45 publications

References 49 publications

Solute Transport and Transformation in an Intermittent, Headwater Mountain Stream with Diurnal Discharge Fluctuations

Solute Transport and Transformation in an Intermittent, Headwater Mountain Stream with Diurnal Discharge Fluctuations

Carbon dynamics in the hyporheic zone of a headwater mountain stream in the Cascade Mountains, Oregon

Spatial and Temporal Dynamics of Dissolved Oxygen Concentrations and Bioactivity in the Hyporheic Zone

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