Management pathways for the successful reduction of nonpoint source nutrients in coastal ecosystems

Green, Lauri; Magel, Caitlin L.; Brown, Cheryl

doi:10.1016/j.rsma.2021.101851

Cited by 5 publications

(5 citation statements)

References 83 publications

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“…Traditional control measures often fall short of achieving desired outcomes for ANPS pollution. Nevertheless, large-scale constructed wetlands have emerged as effective bioengineering solutions for addressing NPS pollution [25], with best management practices and suitable engineering interventions yielding notable results in reducing nutrient load [26]. Therefore, strengthening the control of ANPS TN and TP loads demands a two-pronged approach: source reduction and the implementation of appropriate management and remediation measures.…”

Section: Management Strategies and Recommendationsmentioning

confidence: 99%

“…In addressing NPS pollution, conventional control measures have limitations, but large-scale constructed wetlands have emerged as effective bioengineering solutions [25]. Additionally, the implementation of best management practices and appropriate engineering measures has yielded remarkable results in NPS pollution control and nutrient load reduction, garnering widespread recognition as effective approaches [26].…”

Section: Introductionmentioning

confidence: 99%

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Nitrogen and Phosphorus Loading Characteristics of Agricultural Non-Point Sources in the Tuojiang River Basin

Fu,

Gong,

Chen

et al. 2023

Water

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Agricultural non-point source (ANPS) pollution has emerged as a significant factor influencing water quality within watersheds. Understanding the spatial distribution and composition of ANPS is crucial for effective river water quality management. Based on the statistical data of 28 districts and counties in the Tuojiang River Basin (TJRB), the load distribution characteristics of total nitrogen (TN) and total phosphorus (TP) from ANPS were studied in this work by using the pollutant discharge coefficient method. In 2018, ANPS contributed 60,888.92 tons of TN and 20,085.98 tons of TP to the TJRB. By 2019, the TN load had decreased to 57,155.44 tons, while the TP load increased to 21,659.91 tons. Spatially, TN and TP loads follow a pattern of being lowest in the upstream, intermediate in the downstream, and highest in the middle reaches. Planting sources emerged as the primary contributors to TN and TP loads from ANPS in the TJRB, accounting for 61.43% and 77.39%, respectively. Rural living sources made a lesser contribution, at 20.23% for TN and 9.15% for TP, while poultry and livestock farming sources accounted for 18.34% of TN and 13.46% of TP loads. The analysis of grey water footprint (GWF) and water pollution level (WPL) revealed that TN and TP loads continued to exert significant pressure on the TJRB’s water environment throughout the study period. These findings offer valuable insights for enhancing water quality management in the TJRB.

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Section: Management Strategies and Recommendationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nitrogen and Phosphorus Loading Characteristics of Agricultural Non-Point Sources in the Tuojiang River Basin

Fu,

Gong,

Chen

et al. 2023

Water

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“…Quantifying the effects of nonpoint source nutrients on coastal habitats and tracking the effects of changes on receiving water bodies is a research challenge [ 12 , 14 ]. Characterizing sources consumes time and resources.…”

Section: Introductionmentioning

confidence: 99%

“…It is even harder to track changes in nonpoint source pollution given the challenges associated with timing and delivery. For example, it may take years to decades for groundwater to move from source to sink [ 14 ]. However, concerted efforts to reduce nonpoint source nutrient loads can lead to positive downstream ecosystem responses [ 14 ], and researchers have used indicator species [ 18 , 19 ], water quality monitoring [ 14 ], and models [ 16 ] to identify and assess responses to nonpoint source pollution reductions.…”

Section: Introductionmentioning

confidence: 99%

Tidal Flushing Rather Than Non-Point Source Nitrogen Pollution Drives Nutrient Dynamics in A Putatively Eutrophic Estuary

Krause

Gannon

Oczkowski

et al. 2022

Water

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The effects of nonpoint source nutrients on estuaries can be difficult to pinpoint, with researchers often using indicator species, monitoring, and models to detect influence and change. Here, we made stable isotope measurements of nitrogen and carbon in sediment, water column particulates, primary producers, and consumers at 35 stations in the reportedly eutrophic Barnegat Bay (New Jersey) to assess N sources and processing pathways. Combined with water quality and hydrological data, our C and N isoscapes revealed four distinct geographic zones with diverging isotopic baselines, indicating variable nutrient sources and processing pathways. Overall, the carbon stable isotopes (δ13C) reflected the terrestrial-marine gradient with the most depleted values in the urban and poorly flushed north of the estuary to the most enriched values in the salt marsh-dominated south. In contrast, the nitrogen stable isotope values (δ15N) were most enriched near the oceanic inlets and were consistent with offshore δ15N values in particulate organic matter. Several biogeochemical processes likely alter δ15N, but the relatively lower δ15N values associated with the most urbanized area indicate that anthropogenic runoff is not a dominant N source to this area. Our findings stand in contrast to previous studies of similar estuaries, as δ15N signatures of biota in this system are inversely correlated to population density and nutrient concentrations. Further, our analyses of archival plant (Spartina sp., Phragmites australis) and shell (Geukensia demissa, Ilyanassa obsoleta) samples collected between 1880 and 2020 indicated that δ15N values have decreased over time, particularly in the consumers. Overall, we find that water quality issues appear to be most acute in the poorly flushed parts of Barnegat Bay and emphasize the important role that oceanic exchange plays in water quality and associated estuarine food webs in the lagoon.

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“…The loss of important ecosystem functions, habitats, and species has highlighted the importance of coastal ecosystem services for human quality of life (Barbier et al, 2011;Arkema et al, 2015). Efforts to protect and restore coastal watersheds and estuaries have accelerated but recovery efforts have had variable success (Lotze et al, 2006;Cloern et al, 2016;Green et al, 2021). This task remains challenging in part because of the tight linkages between the land and sea along coasts, which expose estuarine and coastal species and ecosystems to multiple (often synergistic) threats from changes to terrestrial, freshwater, and ocean environments (Kennish, 2002;.…”

Section: Introductionmentioning

confidence: 99%

Evaluating ecosystem-based management alternatives for the Puget Sound, U.S.A. social-ecological system using qualitative watershed models

Magel

Francis²

2022

Front. Mar. Sci.

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Population growth and the associated transformation of landscapes is a major management challenge for coastal ecosystems. Coastal conservation and management should be guided by social, cultural, economic, and ecological objectives, but integrative decision support tools appropriate for complex ecosystems remain underutilized. Evaluating alternative policies for objectives that span the interconnected terrestrial, freshwater, and estuarine habitats along coastlines is limited by the lack of appropriate quantitative tools and available data. We employed qualitative network models (QNMs) to evaluate multi-benefit outcomes of potential management interventions to address population growth and development using a case study of Puget Sound – a large, urbanized fjord-type estuary in Washington, U.S.A. With input from regional scientists and stakeholders, we developed a base conceptual model of the links among human stressors and ecosystem components across the terrestrial-freshwater-estuarine gradient of a generalized Puget Sound watershed. We simulated scenarios representing alternative strategies for accommodating human population growth, namely new development outside of urban centers versus redevelopment (densification) within urban centers, and characterized the responses of multiple recovery objectives and ecosystem stressors for each scenario. Of the urban redevelopment scenarios, reducing stormwater runoff and increasing green infrastructure provided the most favorable outcomes. On rural lands, limiting new development to existing transportation corridors and iincreasing floodplain and riparian habitat extent concomitant with new development produced similar outcomes. Moderate levels of coordinated interventions on both urban and rural lands had favorable outcomes for more ecosystem objectives compared to either moderate intervention applied separately. This study demonstrates the value of qualitative tools for cross-habitat evaluations of possible futures in complex ecosystem-based management systems.

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Management pathways for the successful reduction of nonpoint source nutrients in coastal ecosystems

Cited by 5 publications

References 83 publications

Nitrogen and Phosphorus Loading Characteristics of Agricultural Non-Point Sources in the Tuojiang River Basin

Nitrogen and Phosphorus Loading Characteristics of Agricultural Non-Point Sources in the Tuojiang River Basin

Tidal Flushing Rather Than Non-Point Source Nitrogen Pollution Drives Nutrient Dynamics in A Putatively Eutrophic Estuary

Evaluating ecosystem-based management alternatives for the Puget Sound, U.S.A. social-ecological system using qualitative watershed models

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