Assessing the impact of agricultural pressures on N and P loads and eutrophication risk

Dupas, Rémi; Delmas, Magali; Dorioz, Jean‐Marcel; Garnier, Josette; Moatar, Florentina; Gascuel‐Odoux, Chantal

doi:10.1016/j.ecolind.2014.08.007

Cited by 192 publications

(138 citation statements)

References 73 publications

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“…The N : P molar ratio allows one to determine whether the system studied is potentially under nitrate or phosphate limitation (Koerselman and Meuleman, 1996;Ludwig et al, 2009) and may constitute the basis of some indicators for assessing the risk of eutrophication in freshwater (Dupas et al, 2015). Given other controlling factors as non-limiting factors of phytoplankton growth, if N : P is under 14, the system is limited by N; over 16, it is considered P limited.…”

Section: Nutrient Limitation Variation Since 1980mentioning

confidence: 99%

Eutrophication mitigation in rivers: 30 years of trends in spatial and seasonal patterns of biogeochemistry of the Loire River (1980–2012)

et al. 2015

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Abstract. Trends and seasonality analysis from 1980 onward and longitudinal distribution, from headwaters to estuary, of chlorophyll a, nitrate and phosphate were investigated in the eutrophic Loire River. The continuous decline of phosphate concentrations which has been recorded since 1991 both in the main river and in the tributaries has led to the conclusion that it was responsible for the significant reduction in phytoplanktonic biomass across the whole river system, although Corbicula spp. clams invaded the river during the same period and probably played a significant role in the phytoplankton decline. While eutrophication remained lower in the main tributaries than in the Loire itself, they were found to contribute up to ≈ 35 % to the total nutrient load of the main river. The seasonality analysis revealed significant seasonal variations for the different eutrophication metrics and calls into question the classical monthly survey recommended by national or international authorities. Reducing P inputs impacted these seasonal variations: the decline of seasonal amplitudes of chlorophyll a reduced the seasonal amplitude of orthophosphate and of daily variations of dissolved oxygen and pH but did not significantly affect the seasonal amplitude of nitrate. Thus, the influence of phytoplankton on seasonal variations of nitrate was minor throughout the period of study.

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Section: Nutrient Limitation Variation Since 1980mentioning

confidence: 99%

Eutrophication mitigation in rivers: 30 years of trends in spatial and seasonal patterns of biogeochemistry of the Loire River (1980–2012)

et al. 2015

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“…River export regimes of their dominant soluble forms, dissolved organic C (DOC), nitrate-N (NO R. Dupas et al: Carbon and nutrient export regimes Water-quality assessment programs performed by environmental agencies typically focus on relatively large (> 100 km 2 ) catchments, to increase spatial coverage within a given hydrographic basin or administrative unit, while reducing the density of monitoring stations and thus the cost (Bouraoui and Grizzetti, 2011;Dupas et al, 2015a). However, large catchments include both diffuse and domestic or industrial point-source contributions and possibly various landscape units.…”

Section: Introductionmentioning

confidence: 99%

Carbon and nutrient export regimes from headwater catchments to downstream reaches

et al. 2017

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Abstract. Excessive amounts of nutrients and dissolved organic matter in freshwater bodies affect aquatic ecosystems. In this study, the spatial and temporal variability in nitrate (NO − 3 ), dissolved organic carbon (DOC) and soluble reactive phosphorus (SRP) was analyzed in the Selke (Germany) river continuum from three headwaters draining 1-3 km 2 catchments to two downstream reaches representing spatially integrated signals from 184-456 km 2 catchments. Three headwater catchments were selected as archetypes of the main landscape units (land use × lithology) present in the Selke catchment. Export regimes in headwater catchments were interpreted in terms of NO − 3 , DOC and SRP land-to-stream transfer processes. Headwater signals were subtracted from downstream signals, with the differences interpreted in terms of in-stream processes and contributions from point sources. The seasonal dynamics for NO − 3 were opposite those of DOC and SRP in all three headwater catchments, and spatial differences also showed NO − 3 contrasting with DOC and SRP. These dynamics were interpreted as the result of the interplay of hydrological and biogeochemical processes, for which riparian zones were hypothesized to play a determining role. In the two downstream reaches, NO − 3 was transported almost conservatively, whereas DOC was consumed and produced in the upper and lower river sections, respectively. The natural export regime of SRP in the three headwater catchments mimicked a point-source signal (high SRP during summer low flow), which may lead to overestimation of domestic contributions in the downstream reaches. Monitoring the river continuum from headwaters to downstream reaches proved effective to jointly investigate land-to-stream and instream transport, and transformation processes.

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“…Particularmente, a má gestão do uso do solo, aliada ao crescimento da população e à expansão industrial observada nas últimas décadas, tem provocado o decréscimo da qualidade da água de rios, lagos e reservatórios (ALLAN, 2004;MENEZES et al, 2014;DUPASA et al, 2015;FIA et al, 2015).…”

Section: Introductionunclassified

“…Os padrões de uso do solo têm importante influência sobre a qualidade da água (superficial e subterrânea) e os ecossistemas aquáti-cos dentro de uma bacia hidrográfica (LEE et al, 2009;TRAN et al, 2010;ROTHWELL et al, 2010;BU et al, 2014, MENEZES et al, 2014DUPASA et al, 2015;FIA et al, 2015). Inúmeros problemas relacionados com a qualidade da água são causados pelo mau uso do solo, como urbanização, atividades industriais e agrícolas (NGOYE; MACHIWA, 2004;KANG et al, 2010;DUPASA et al, 2015).…”

Section: Introductionunclassified

“…Inúmeros problemas relacionados com a qualidade da água são causados pelo mau uso do solo, como urbanização, atividades industriais e agrícolas (NGOYE; MACHIWA, 2004;KANG et al, 2010;DUPASA et al, 2015). Geralmente, o uso e o manejo das terras agrícolas têm forte influência sobre as concentrações de nutrientes na água, como o nitrogênio e o fósforo (NGOYE; MACHIWA, 2004;WOLI et al, 2004;BU et al, 2014).…”

Section: Introductionunclassified

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Relação entre padrões de uso e ocupação do solo e qualidade da água em uma bacia hidrográfica urbana

Menezes

Bittencourt²,

Farias³

et al. 2016

Eng. Sanit. Ambient.

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Assessing the impact of agricultural pressures on N and P loads and eutrophication risk

Cited by 192 publications

References 73 publications

Eutrophication mitigation in rivers: 30 years of trends in spatial and seasonal patterns of biogeochemistry of the Loire River (1980–2012)

Eutrophication mitigation in rivers: 30 years of trends in spatial and seasonal patterns of biogeochemistry of the Loire River (1980–2012)

Carbon and nutrient export regimes from headwater catchments to downstream reaches

Relação entre padrões de uso e ocupação do solo e qualidade da água em uma bacia hidrográfica urbana

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