Hydrologic Influences on Groundwater-Surface Water Ecotones: Heterogeneity in Nutrient Composition and Retention

Valett, H. Maurice; Dahm, Clifford N.; Campana, Michael E.; Morrice, John A.; Baker, Michelle A.; Fellows, Christy Susan

doi:10.2307/1468254

Cited by 125 publications

(105 citation statements)

References 24 publications

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“…Other studies in semiarid regions have reported increased water residence time in alluvial zones when sediments have high hydraulic conductivity, which has important implications for nutrient cycling and retention (e.g. Valett et al, 1996Valett et al, , 1997Morrice et al, 1997;Martí et al, 1997).…”

Section: Hydrological and Biogeochemical Solute Retention In The Allumentioning

confidence: 99%

Changes in discharge and solute dynamics between hillslope and valley-bottom intermittent streams

Bernal

Sabater

2012

Hydrol. Earth Syst. Sci.

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Abstract. To gain understanding on how alluvial zones modify water and nutrient export from semiarid catchments, we compared monthly discharge as well as stream chloride, carbon, and nitrogen dynamics between a hillslope catchment and a valley-bottom catchment with a well-developed alluvium. Stream water and solute fluxes from the hillslope and valley-bottom catchments showed contrasting patterns between hydrological transitions and wet periods, especially for bio-reactive solutes. During transition periods, stream water export decreased >40 % between the hillslope and the valley bottom coinciding with the prevalence of streamto-aquifer fluxes at the alluvial zone. In contrast, stream water export increased by 20-70 % between the hillslope and valley-bottom catchments during wet periods. During transition periods, stream solute export decreased by 34-97 % between the hillslope and valley-bottom catchments for chloride, nitrate, and dissolved organic carbon. In annual terms, stream nitrate export from the valley-bottom catchment (0.32 ± 0.12 kg N ha −1 yr −1 [average ± standard deviation]) was 30-50 % lower than from the hillslope catchment (0.56 ± 0.32 kg N ha −1 yr −1 ). The annual export of dissolved organic carbon was similar between the two catchments (1.8 ± 1 kg C ha −1 yr −1 ). Our results suggest that hydrological retention in the alluvial zone contributed to reduce stream water and solute export from the valley-bottom catchment during hydrological transition periods when hydrological connectivity between the hillslope and the valley bottom was low.

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Section: Hydrological and Biogeochemical Solute Retention In The Allumentioning

confidence: 99%

Changes in discharge and solute dynamics between hillslope and valley-bottom intermittent streams

Bernal

Sabater

2012

Hydrol. Earth Syst. Sci.

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“…At the reach scale, streambed permeability favors water exchanges between surface and hyporheic porous media, causing a physical delay in nutrient transport. This physical delay, coupled with biological activity within the sediment, suggests that the stream surface-subsurface hydrological linkage may be an important factor in enhancing stream nutrient retention, at least in non-polluted streams (Valett et al, 1997;Fisher et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

Effects of wastewater treatment plant pollution on in-stream ecosystems functions in an agricultural watershed

Sánchez‐Pérez

Gérino²,

Sauvage³

et al. 2009

Ann. Limnol. - Int. J. Lim.

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-We studied the effect of point-source and non-point-source pollution on the retention capacity of the stream and its link with the metabolic state (primary production and respiration) and invertebrates assemblages in a third order Mediterranean stream. Two experimental sites were chosen: one in the upper part of the catchment (Monte´gut site) characterized by low concentrations in nitrate and phosphate and one in the lower part of the catchment (Le´zat site) characterized by high nitrate and phosphorus concentrations. Both experimental sites were located on reaches that included a Waste Water Treatment Plant (WWTP) point nutrient source allowing discussion of the relative effects of point-source and non-point-source nutrients loads on ecosystem function (respiration and uptake rates) and aquatic organism assemblages. NH 4 + -N, and PO 4 3x -P uptake rates were determined using solute additions conducted at constant rates (short-term nutrient addition procedure) and NO 3x -N uptake rates were determined using instantaneous solute addition (slug addition procedure). Rates of gross primary production (GPP) and ecosystem respiration were determined using the open system, two-stations diurnal oxygen change method. Benthic invertebrate communities were investigated for species and functional feeding groups diversities measurements. Results show that autotrophy in the river results from nutrients of two distinct origins: point sources for phosphorus (urban area and WWTP) and non-point sources for nitrogen (agricultural zones) with local additions from WWTP inputs.Comparison between the two sites shows that the WWTP did not affect uptake rates, respiration or primary production of the ecosystem in the low-nutrient Monte´gut reach despite increase of invertebrates communities biomass density. Inputs from the WWTP, in the high nitrate and phosphate Le´zat reach, increased respiration, lower benthic biomass and led to changes in the species composition and did not affect uptake rates.

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“…It provides conditions within streams for heterotrophic primary production [Mulholland et ] to locations far from the stream channel [Stanford and Ward, 1993], hyporheic flow provides habitat for aquatic macroinvertebrates. Hyporheic flow changes surface water quality characteristics through physical and biogeochemical processes: physical mixing with groundwater [Constantz, 1998], chemical reactions Harvey and Fuller, 1998], microbially mediated chemical transformations [Duff and Triska, 1990;McMahon and Bohlke, 1996], and transport of nutrients to streams through groundwater-surface water interactions [Wondzell and Swanson, 1996;Valett et al, 1997].…”

Section: Introductionmentioning

confidence: 99%

Transient storage and hyporheic flow along the Willamette River, Oregon: Field measurements and model estimates

Fernald¹,

Wigington²,

Landers³

2001

Water Resources Research

104

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Abstract. Transient storage is a measure of the exchange of main channel flow with subsurface hyporheic flow and surface water dead zones. Hyporheic flow, in which river water enters the channel bed and banks to reemerge downstream, promotes biochemical processes that are important for water quality and aquatic habitat. Previous studies have quantified transient storage and hyporheic flow on small streams but were not specifically developed to identify both of these processes over long reaches of large rivers. We studied transient storage on the eighth-order upper Willamette River, which flows through highporosity gravel deposits conducive to hyporheic flow. We used main channel dye tracer studies and solute transport modeling to estimate transient storage on nine study reaches in a 26-km-long study area. We also took dye measurements

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Hydrologic Influences on Groundwater-Surface Water Ecotones: Heterogeneity in Nutrient Composition and Retention

Cited by 125 publications

References 24 publications

Changes in discharge and solute dynamics between hillslope and valley-bottom intermittent streams

Changes in discharge and solute dynamics between hillslope and valley-bottom intermittent streams

Effects of wastewater treatment plant pollution on in-stream ecosystems functions in an agricultural watershed

Transient storage and hyporheic flow along the Willamette River, Oregon: Field measurements and model estimates

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