Editorial: Riparian Buffer Nutrient Dynamics and Water Quality

Young, Eric O.; Ross, Donald S.; Jaynes, Dan B.

doi:10.3389/fenvs.2019.00076

Cited by 6 publications

(3 citation statements)

References 6 publications

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“…Catchment conditions, e.g., weather, hydrology, topography, soils, geology, land-use etc. together with catchment management decisions, such as landuse change, (Zhang et al 2021 ), natural flood retention measures, (Collentine and Futter 2018 ), riparian buffers, (Young et al 2019 ) directly influence river flows and bio-physical water conditions. These, in turn, influence the ecological responses and the associated ES.…”

Section: Methodsmentioning

confidence: 99%

A Bayesian Modelling Framework for Integration of Ecosystem Services into Freshwater Resources Management

Bruen

Hallouin

Christie

et al. 2022

Environmental Management

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Models of ecological response to multiple stressors and of the consequences for ecosystem services (ES) delivery are scarce. This paper describes a methodology for constructing a BBN combining catchment and water quality model output, data, and expert knowledge that can support the integration of ES into water resources management. It proposes “small group” workshop methods for elucidating expert knowledge and analyses the areas of agreement and disagreement between experts. The model was developed for four selected ES and for assessing the consequences of management options relating to no-change, riparian management, and decreasing or increasing livestock numbers. Compared with no-change, riparian management and a decrease in livestock numbers improved the ES investigated to varying degrees. Sensitivity analysis of the expert information in the BBN showed the greatest disagreements between experts were mainly for low probability situations and thus had little impact on the results. Conversely, in our applications, the best agreement between experts tended to occur for the higher probability, more likely, situations. This has implications for the practical use of this type of model to support catchment management decisions. The complexity of the relationship between management measures, the water quality and ecological responses and resulting changes in ES must not be a barrier to making decisions in the present time. The interactions of multiple stressors further complicate the situation. However, management decisions typically relate to the overall character of solutions and not their detailed design, which can follow once the nature of the solution has been chosen, for example livestock management or riparian measures or both.

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Section: Methodsmentioning

confidence: 99%

A Bayesian Modelling Framework for Integration of Ecosystem Services into Freshwater Resources Management

Bruen

Hallouin

Christie

et al. 2022

Environmental Management

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“…In agricultural systems that receive excessive amounts of fertilizers, vegetated riparian buffer zones have been implemented as a strategy to reduce the transfer of N and P to aquatic ecosystems to avoid eutrophication and toxic algal blooms. While multiple studies have shown that this strategy is effective in reducing N inputs to surface water bodies (Hill, 2019; Mayer et al., 2007; Zhao et al., 2021), the effect of riparian buffer zones on P transfer is less clear (Gu et al., 2017; Hoffmann et al., 2009; Young et al., 2019). Vegetated riparian buffer zones provide a physical barrier that slows down the overland flow, which allows for stronger infiltration of P into the soil, where it is retained in geochemical pools (e.g., through sorption and precipitation processes) and biological pools (e.g., through uptake by roots and microorganisms) (Dosskey et al., 2010; Hoffmann et al., 2009; Zhang et al., 2010).…”

Section: Ecosystem‐scale Coupling Of Water and Nutrient Dynamicsmentioning

confidence: 99%

Soil water status shapes nutrient cycling in agroecosystems from micrometer to landscape scales

Bauke

Amelung

Bol

et al. 2022

J. Plant Nutr. Soil Sci.

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Soil water status, which refers to the wetness or dryness of soils, is crucial for the productivity of agroecosystems, as it determines nutrient cycling and uptake physically via transport, biologically via the moisture‐dependent activity of soil flora, fauna, and plants, and chemically via specific hydrolyses and redox reactions. Here, we focus on the dynamics of nitrogen (N), phosphorus (P), and sulfur (S) and review how soil water is coupled to the cycling of these elements and related stoichiometric controls across different scales within agroecosystems. These scales span processes at the molecular level, where nutrients and water are consumed, to processes in the soil pore system, within a soil profile and across the landscape. We highlight that with increasing mobility of the nutrients in water, water‐based nutrient flux may alleviate or even exacerbate imbalances in nutrient supply within soils, for example, by transport of mobile nutrients towards previously depleted microsites (alleviating imbalances), or by selective loss of mobile nutrients from microsites (increasing imbalances). These imbalances can be modulated by biological activity, especially by fungal hyphae and roots, which contribute to nutrient redistribution within soils, and which are themselves dependent on specific, optimal water availability. At larger scales, such small‐scale effects converge with nutrient inputs from atmospheric (wet deposition) or nonlocal sources and with nutrient losses from the soil system towards aquifers. Hence, water acts as a major control in nutrient cycling across scales in agroecosystems and may either exacerbate or remove spatial disparities in the availability of the individual nutrients (N, P, S) required for biological activity.

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“…Another management practice advocated in the USA and other developed countries consists of buffer strips near the stream to remove P from the runoff water before entering the stream (Georgakakos et al, 2018;Young et al, 2019). In the (sub) humid Ethiopian highlands, the near stream area is saturated after the middle of the rain phase.…”

Section: Best Management Practicesmentioning

confidence: 99%

Phosphorus Export From Two Contrasting Rural Watersheds in the (Sub) Humid Ethiopian Highlands

Sishu

Bekele

Schmitter³

et al. 2021

Front. Earth Sci.

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Establishing worldwide sustainable and phosphorus efficient cropping systems is urgently needed because the supply of suitable phosphate rock is limited, and excess phosphorus in streams causes eutrophication. One of the impediments in the developing world for sustainable P practices is the lack of studies on P transport and its eventual disposition in the environment. One of these regions with few studies is the Ethiopian Highlands, with permeable volcanic soils. The objective was to establish baseline data on P watershed export in the (sub)humid highlands. Two contrasting watersheds were selected near Lake Tana. For 2 years, stream discharge and sediment, total P, dissolved P, and bioavailable particulate P concentrations were determined at the watershed outlet. The first watershed is the 57 km2 Dangishta, with lava intrusion dikes, forcing subsurface flow through faults to the surface and preventing gully formation. Subsurface flow was half of the 1745 mm annual precipitation, and surface runoff and erosion were minimal. The second watershed is the 9 km2 Robit Bata with 1,420 mm precipitation. The banks of several river banks were slumping. The upper part of the watershed generates saturation excess runoff. A hillslope aquifer in the lower part provided interflow. The average sediment concentrations of 10.5 g L−1 in the stream in Robit Bata (11 times that in Dangishta) reflected the sediments from banks slipping in the stream. The hydrology and the soil loss directly affected the phosphorus export. In Dangishta, the total P concentration averaged 0.5 mg L−1 at the outlet. In Robit Bata, the average total P concentration was 2 mg L−1. The bioavailable particulate P concentration was only twice the concentration in the runoff water. The low phosphorus content of the subsoil slipping in Robit Bata moderated biologically available particulate P at the outlet. Average dissolved P concentrations for both watersheds were around 0.1 mg L−1 in the low range found in temperate climates. It reflects the difference in length of time that phosphorus fertilizers have been applied. Our research concludes that commonly implemented practices such as strengthening river banks and stabilizing gully might not lead to improved water quality in Lake Tana.

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Editorial: Riparian Buffer Nutrient Dynamics and Water Quality

Cited by 6 publications

References 6 publications

A Bayesian Modelling Framework for Integration of Ecosystem Services into Freshwater Resources Management

A Bayesian Modelling Framework for Integration of Ecosystem Services into Freshwater Resources Management

Soil water status shapes nutrient cycling in agroecosystems from micrometer to landscape scales

Phosphorus Export From Two Contrasting Rural Watersheds in the (Sub) Humid Ethiopian Highlands

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