Non-domestic phosphorus release in rivers during low-flow: Mechanisms and implications for sources identification

Dupas, Rémi; Tittel, Jörg; Jordan, Phil; Musolff, Andreas; Rode, Michael

doi:10.1016/j.jhydrol.2018.03.023

Cited by 27 publications

(15 citation statements)

References 61 publications

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“…Increased summer and fall SRP yields may also be sourced from water‐saturated riparian wetland soils. Warmer temperatures and water‐saturated soils drive reduced redox conditions in riparian wetlands, promoting the reductive dissolution and mobilization of SRP from wetlands (Dupas et al, 2018; Gu et al, 2017; Hoffmann et al, 2009; Surridge et al, 2007). Thus, the same seasonal physicochemical conditions in riparian wetlands that promote NO 3 − removal promote SRP mobilization.…”

Section: Discussionmentioning

confidence: 99%

Land Use and Season Influence Event‐Scale Nitrate and Soluble Reactive Phosphorus Exports and Export Stoichiometry from Headwater Catchments

Kincaid

Seybold

Adair

et al. 2020

Water Resources Research

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Catchment nutrient export, especially during high flow events, can influence ecological processes in receiving waters by altering nitrogen (N) and phosphorus (P) concentrations and relative amounts (stoichiometry). Event-scale N and P export dynamics may be significantly altered by land use/land cover (LULC) and season. Consequently, to manage water resources, it is important to understand how LULC and season interact to influence event N and P export. In situ, high-frequency spectrophotometers allowed us to continuously and concurrently monitor nitrate (NO 3 −) and soluble reactive P (SRP) concentrations and therefore examine event-scale NO 3 − and SRP export dynamics. Here we analyzed event NO 3 − and SRP concentration-discharge hysteresis patterns and yields for >400 events to evaluate how LULC and seasonality influence event NO 3 − and SRP export dynamics in three low-order watersheds with different primary LULCs (agricultural, forested, and urban). Differences among event NO 3 − and SRP hysteresis patterns suggest these nutrients have different source areas and dominant transport pathways that were impacted by both LULC and seasonality. Unexpectedly, we observed similar seasonal patterns in event NO 3 − :SRP stoichiometry among LULCs, with the most N-enriched events occurring in spring, and event stoichiometry approaching Redfield N:P ratios in the fall. However, seasonal stoichiometry patterns were driven by unique seasonal NO 3 − and SRP export patterns at each site. Overall these findings suggest LULC and seasonality interact to alter the timing and magnitude of event NO 3 − and SRP exports, leading to seasonal patterns in event NO 3 − to SRP stoichiometry that may influence ecological processes, such as productivity, in receiving waters. Plain Language Summary High flow events transport relatively large quantities of nitrogen (N) and phosphorus (P) to streams and downstream waterbodies where they may stimulate algal blooms and degrade water quality. We evaluated how land uses and seasons alter event nutrient transport. We monitored >400 events with sensors in streams with contrasting land uses. Event N and P concentration patterns differed from each other suggesting dissolved N and P were transported from different locations in the landscape. Further, the agricultural and urban streams received more dissolved N and P than the forested stream. This likely results from fertilizer applications in excess of crop (agricultural and lawn grass) needs and landscape modifications, such as drainage systems and impervious surfaces, that limit soils and vegetation from removing nutrients from runoff. Lastly, season influenced the ratio of dissolved N to P delivery, with spring events transporting the most N relative to P and fall events transporting the least. Overall, land use and season uniquely influenced event nutrient transport. Management strategies to reduce algal blooms in downstream waterbodies must consider interactions among land use, nutrient type, and season. However, ratios of N to P may change seasona...

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Section: Discussionmentioning

confidence: 99%

Land Use and Season Influence Event‐Scale Nitrate and Soluble Reactive Phosphorus Exports and Export Stoichiometry from Headwater Catchments

Kincaid

Seybold

Adair

et al. 2020

Water Resources Research

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“…Summer-fall release of TFe was observed each year, reflecting a regular yearly cycle of reductive dissolution of bed-sediment Fe oxyhydroxides, resulting in relatively little year-to-year variability in summer-fall TFe concentrations ( Figure 1; Supplemental Figure S2). Seasonal release of soluble P in freshwaters, including ponds and wetlands, is typically attributed to the reductive dissolution of Fe oxyhydroxides in bed sediments during anoxic conditions, releasing PO 4 3− , when flow velocities decrease, water and sediment temperatures increase, and oxygen becomes depleted as a result of higher rates of microbial activity (Dupas, Tittel, Jordan, Musolff, & Rode, 2018;Gu et al, 2017Gu et al, , 2019Palmer-Felgate et al, 2010;Palmer-Felgate, Bowes, Stratford, Neal, & MacKenzie, 2011). The prolonged periods of TFe release observed during the summer and fall each year indicate that the chemistry of the wetland outflow at these times was dominated by anaerobic processes occurring within the pond and the marginal wetlands, which are submerged all year.…”

Section: Iron Redox Controls On Srp Releasementioning

confidence: 99%

Biogeochemical and climate drivers of wetland phosphorus and nitrogen release: Implications for nutrient legacies and eutrophication risk

et al. 2020

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The dynamics and processes of nutrient cycling and release were examined for a lowland wetland-pond system, draining woodland in southern England. Hydrochemical and meteorological data were analyzed from 1997 to 2017, along with high-resolution in-situ sensor measurements from 2016 to 2017. The results showed that even a relatively pristine wetland can become a source of highly-bioavailable phosphorus, nitrogen and silicon during low-flow periods of high ecological sensitivity. The drivers of nutrient release were primary production and accumulation of biomass, which provided a carbon source for microbial respiration and, via mineralization, a source of bioavailable nutrients for phosphorus and nitrogen co-limited microbes. During high-intensity nutrient-release events, the dominant nitrogen-cycling process switched from denitrification to ammonification, and a positive-This article is protected by copyright. All rights reserved. 2 feedback cycle of phosphorus and nitrogen release was sustained over several months during summer and fall. Temperature controls on microbial activity were the primary drivers of short-term (day-today) variability in phosphorus release, with subdaily (diurnal) fluctuations in phosphorus concentrations driven by water-body metabolism. Inter-annual relationships between nutrient release and climate variables indicated 'memory' effects of antecedent climate drivers, through accumulated legacy organic matter from the previous year's biomass production. Natural flood management initiatives promote the use of wetlands as 'nature-based solutions' in climate-change adaptation, flood management, and soil and water conservation. This study highlights potential water-quality trade-offs, and shows how the convergence of climate and biogeochemical drivers of wetland nutrient release can amplify background nutrient signals by mobilizing legacy nutrients, causing water-quality impairment and accelerating eutrophication risk.

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“…Sweden in the period 1999 -2011, decided to address this problem [3]. The EU also defined in a coordinated way Directive 2000/60/EC and attach great importance to all forms of water pollution [24]. This regulation and programs up to this level have not occurred in Colombia where it is estimated that only 10% of the systems built have an adequate functioning (https://bit.ly/2yfdwtY).…”

Section: Calibration and Definition Of Loads (Point And Diffuse)mentioning

confidence: 99%

Systematic methodology for determining water quality objectives through mathematical modeling

Montiel¹,

Nardini²,

Brito³

2018

ces

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As a first step towards the restoration of the Ranchería River (La Guajira-Colombia), we have set Water Quality Objectives (WQO) with a systematic methodology. This methodology consists of initially establishing desirable WQO, consistent with current and potential uses; then it is checked whether the current quality status meets them; afterwards, a feasible sanitation plan is defined for the medium-term (acting on point-wise loads) and for the long-term (on diffuse loads) trying to attain the chosen OCA. Through water quality simulation model (QUAL2KW in our case), suitably calibrated, the corresponding level of achievement of such desirable OCA is hence assessed. Typically, it is necessary to reduce the expectations (WQO targets), especially in the long-term because they can only be achieved with challenging interventions on diffuse sources. The newly determined targets are hence the operational ones. However, also the desirable OCA are useful as a stimulus for start a long-term process. The proposed methodology is useful for any Water Resource Management Plans (WRMP) in Colombia and also in other countries as it avoids the usual error of setting non-attainable WQO that leads to frustration and sometimes to escaping to comply with environmental responsibilities.

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Non-domestic phosphorus release in rivers during low-flow: Mechanisms and implications for sources identification

Cited by 27 publications

References 61 publications

Land Use and Season Influence Event‐Scale Nitrate and Soluble Reactive Phosphorus Exports and Export Stoichiometry from Headwater Catchments

Land Use and Season Influence Event‐Scale Nitrate and Soluble Reactive Phosphorus Exports and Export Stoichiometry from Headwater Catchments

Biogeochemical and climate drivers of wetland phosphorus and nitrogen release: Implications for nutrient legacies and eutrophication risk

Systematic methodology for determining water quality objectives through mathematical modeling

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