Point-source effects on N and P uptake in a forested and an agricultural Mediterranean streams

Merseburger, G.; Martı́, Eugènia; Sabater, Francesc; Ortiz, J. D.

doi:10.1016/j.scitotenv.2010.11.014

Cited by 30 publications

(42 citation statements)

References 78 publications

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“…The latter observation was probably due to the reduction in the available carbon, depicted by the reduction in BOD Status: C common, R rare, S sporadic taxa Nutrient uptake and macroinvertebrate community structure in a highly regulated Mediterranean… (Table 2) and the relatively low interaction between the stream and the hyporheic zone since most of the streambed is comprised of silt particles. The finding that the uptake rate for most nutrients (Table 3) was higher in the downstream section was also seen in other studies on the impact of WWTP input into streams (Marti et al 2004;Haggard et al 2005;Merseburger et al 2005Merseburger et al , 2011. However, the high ambient DIN concentrations prevented the higher uptake rates from having any significant, observable effect on water quality.…”

Section: Discussionsupporting

confidence: 82%

“…Nevertheless, a variety of opposing relationships between uptake velocity and DIN concentrations have been observed in low concentration range settings (Webster et al 2003;Haggard et al 2005;Merseburger et al 2005;O'Brien and Dodds 2008). Such findings are probably related to other physical-chemical conditions in the streams or to the physiological conditions of the stream biofilms (Marti et al 2004;Merseburger et al 2005Merseburger et al , 2011.…”

Section: Effect Of Din On Nutrient Uptake Velocitymentioning

confidence: 99%

“…and PO 4 3- (Marti et al 2004;Haggard et al 2005;Merseburger et al 2011). Elevated nutrient levels, in turn, can degrade the nutrient uptake ability of the stream due to nutrient saturation (Earl et al 2006;Bernot et al 2006), which may shift the role of the stream from that of a net sink for nutrients to a nutrient source for downstream environments.…”

Section: Introductionmentioning

confidence: 99%

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Nutrient uptake and macroinvertebrate community structure in a highly regulated Mediterranean stream receiving treated wastewater

2015

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Streamflow augmentationwith treated wastewater has been suggested as a strategy for increasing flow in streams, but at the same time, concern has been raised regarding the possible deterioration of water quality. In this study, the spatial and temporal distributions of nutrient uptake rates and macroinvertebrates were measured in a Mediterranean lowland stream (Yarqon, Israel), upstream and downstream of treated wastewater input. Over the last decade, the average downstream reach's nutrient demand, depicted as the uptake velocities of NH 4? -N, NO 3 --N, and PO 4 3--P, increased by factors of 50, 10, and 6, respectively. The decrease in the ambient concentration of NH 4 ? -N, from an average of 39 to 2.8 mg L -1 after upgrading the effluent quality, was the main reason for the observed improvements in uptake velocities. Nevertheless, the uptake length in the Yarqon Stream after the improvement in the quality of the treated wastewater was improved only for NH 4 ? -N, and deteriorated for NO 3 --N, and PO 4 3--P. Following the improvement in water quality, the uptake velocities and the macroinvertebrate communities in the downstream section are currently not significantly different from those in the upstream section. The macroinvertebrate assemblage structure reveals that tolerant taxa dominate the stream, and the increase of the taxa richness in the downstream section is attributed to rare and more sensitive taxa that recolonized this section following water quality improvement. The results suggest that improving the quality of the treated wastewater that is used for stream flow augmentation can have a positive effect on nutrient uptake velocities and macroinvertebrate assemblage structure. However, further ecological and economical cost-benefit analysis is needed to evaluate the feasibility of using treated wastewater augmentation for Mediterranean stream restoration.

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Section: Discussionsupporting

confidence: 82%

Section: Effect Of Din On Nutrient Uptake Velocitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nutrient uptake and macroinvertebrate community structure in a highly regulated Mediterranean stream receiving treated wastewater

2015

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“…According to Grabowska (2012), favorable conditions for phytoplankton growth consists if total N > 1.5 mg L -1 . Nutrients enter surface waters through point or diffuse sources (Jamshidi et al, 2010;Lam et al, 2010;Merseburger et al, 2011). Point sources can enter at fixed locations, e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Point sources can enter at fixed locations, e.g. wastewater treatment plant outlets, industries, pig farms or aquaculture (Merseburger et al, 2011). While point sources cause abrupt hydrological and chemical discontinuities along the stream, diffuse sources are not as spatially discrete and cause more gradual changes (Lam et al, 2010;Merseburger et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Best management practices to reduce nitrate pollution in a rural watershed in Germany

Pott¹,

Fohrer²

2017

Rev. ambiente água

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Water pollution by nitrogen originates at diffuse and point sources. In surface aquatic systems, nitrate is one of the most problematic forms of nitrogen, causing phytoplankton and macrophyte growth and consequently water eutrophication. This study evaluated whether the Soil and Water Assessment Tool (SWAT) model can simulate nitrate load in a rural watershed in daily and monthly time increments. The study investigated 462 km² of the upper part of the Stör catchment, a typical rural lowland catchment located in Northern Germany. The results showed that simulations of nitrate load at monthly increments are better predictors of observed data than daily simulations. The most effective practices to minimize the NO3-N load were the reduction of nitrogen fertilizer application and the increasing of conservation areas, such as field filter strips.Keywords: land use, nitrogen pollution, non-point pollution, SWAT model. Melhores práticas de manejo para reduzir a poluição por nitrato em uma bacia hidrográfica rural na Alemanha RESUMOA poluição da água causada por nitrogênio é originada por fontes difusas e pontuais. Em sistemas aquáticos superficiais, o nitrato é uma das formas mais problemáticas de nitrogênio, causando crescimento de fitoplâncton e de macrófitas e consequentemente a eutrofização da água. Este estudo teve o objetivo de avaliar se o modelo Soil and Water Assessment Tool (SWAT) pode simular a carga de nitrato em uma bacia hidrográfica rural em séries diárias e mensais. Foram investigados 462 km² da parte superior da bacia hidrográfica do rio Stör, uma bacia de planície tipicamente rural localizada no norte da Alemanha. Os resultados mostraram que as simulações de carga de nitratos em incrementos mensais são melhores preditores de dados observados do que simulações diárias. As práticas mais efetivas para minimizar as cargas de NO3-N foram a redução da aplicação de fertilizante nitrogenado e o incremento de áreas de conservação, tal como as faixas filtro.Palavras-chave: nitrogênio, polluição difusa, modelo SWAT, uso da terra. 889Best management practices to reduce nitrate pollution ...Rev. Ambient. Água vol. 12 n. 6 Taubaté -Nov. / Dec. 2017

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Wastewater influences nitrogen dynamics in a coastal catchment during a prolonged drought

Bruesewitz¹,

Hoellein

Mooney³

et al. 2017

Limnology & Oceanography

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Ecosystem function measurements can enhance our understanding of nitrogen (N) delivery in coastal catchments across river and estuary ecosystems. Here, we contrast patterns of N cycling and export in two rivers, one heavily influenced by wastewater treatment plants (WWTP), in a coastal catchment of south Texas. We measured N export from both rivers to the estuary over 2 yr that encompass a severe drought, along with detailed mechanisms of N cycling in river, tidal river, and two estuary sites during prolonged drought. WWTP nutrient inputs stimulated uptake of N, but denitrification resulting in permanent N removal accounted for only a small proportion of total uptake. During drought periods, WWTP N was the primary source of exported N to the estuary, minimizing the influence of episodic storm‐derived nutrients from the WWTP‐influenced river to the estuary. In the site without WWTP influence, the river exported very little N during drought, so storm‐derived nutrient pulses were important for delivering N loads to the estuary. Overall, N is processed from river to estuary, but sustained WWTP‐N loads and periodic floods alter the timing of N delivery and N processing. Research that incorporates empirical measurements of N fluxes from river to estuary can inform management needs in the face of multiple anthropogenic stressors such as demand for freshwater and eutrophication.

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Point-source effects on N and P uptake in a forested and an agricultural Mediterranean streams

Cited by 30 publications

References 78 publications

Nutrient uptake and macroinvertebrate community structure in a highly regulated Mediterranean stream receiving treated wastewater

Nutrient uptake and macroinvertebrate community structure in a highly regulated Mediterranean stream receiving treated wastewater

Best management practices to reduce nitrate pollution in a rural watershed in Germany

Wastewater influences nitrogen dynamics in a coastal catchment during a prolonged drought

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