Phosphorus forms in urban and agricultural runoff: Implications for management of Danish Lake Nordborg

Egemose, Sara; Jensen, Henning S.

doi:10.1080/07438140903413228

Cited by 20 publications

(23 citation statements)

References 22 publications

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“…Here, seminatural land cover is likely acting as a proxy for other factors (Segurado et al, 2018), such as varying bioavailability of P fractions (Ellison and Brett, 2006; Prestigiacomo et al, 2016; Stutter et al, 2018), river morphology, riparian and/or aquatic habitat structure, and absence of toxic contaminants (e.g., herbicides). In addition, the bioavailability of P forms has been shown to vary between 12 and 73% for TP and between 6 and 81% for particulate P in catchments dominated by different land cover types (Ellison and Brett, 2006; Egemose and Jensen, 2009; Poirier et al, 2012; Baker et al, 2014). Some land cover types, such as agriculture and urban land use, make TP more bioavailable (Ellison and Brett, 2006; Prestigiacomo et al, 2016), while TP from seminatural land cover is likely to be less bioavailable (Stutter et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

Modeling the Ecological Impact of Phosphorus in Catchments with Multiple Environmental Stressors

et al. 2019

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The broken phosphorus (P) cycle has led to widespread eutrophication of freshwaters. Despite reductions in anthropogenic nutrient inputs that have led to improvement in the chemical status of running waters, corresponding improvements in their ecological status are often not observed. We tested a novel combination of complementary statistical modeling approaches, including random‐effect regression trees and compositional and ordinary linear mixed models, to examine the potential reasons for this disparity, using low‐frequency regulatory data available to catchment managers. A benthic Trophic Diatom Index (TDI) was linked to potential stressors, including nutrient concentrations, soluble reactive P (SRP) loads from different sources, land cover, and catchment hydrological characteristics. Modeling suggested that SRP, traditionally considered the bioavailable component, may not be the best indicator of ecological impacts of P, as shown by a stronger and spatially more variable negative relationship between total P (TP) concentrations and TDI. Nitrate‐N (p < 0.001) and TP (p = 0.002) also showed negative relationship with TDI in models where land cover was not included. Land cover had the strongest influence on the ecological response. The positive effect of seminatural land cover (p < 0.001) and negative effect of urban land cover (p = 0.030) may be related to differentiated bioavailability of P fractions in catchments with different characteristics (e.g., P loads from point vs. diffuse sources) as well as resilience factors such as hydro‐morphology and habitat condition, supporting the need for further research into factors affecting this stressor–response relationship in different catchment types. Advanced statistical modeling indicated that to achieve desired ecological status, future catchment‐specific mitigation should target P impacts alongside multiple stressors. Core Ideas Soluble reactive P (SRP) alone was not the best indicator of diatom response. Total P (TP) association with diatoms was more spatially variable than SRP. Nitrate‐N and TP have a combined negative effect on the ecological response. Seminatural land use had the most important influence on ecological response. We recommend catchment‐specific mitigation of multiple stressors.

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Section: Discussionmentioning

confidence: 99%

Modeling the Ecological Impact of Phosphorus in Catchments with Multiple Environmental Stressors

et al. 2019

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“…The dose was divided into four applications made over summer and fall 2006 in order to keep lake water pH above 6. Lake Nordborg is well described in Egemose & Jensen (2009) and Egemose et al (2011). Also, Lake Nordborg is exposed to western wind and is polymictic despite its maximum water depth of 8.5 m. Onethird of the watershed is urban and the remaining area is mainly used for agricultural production with high application rates of manure.…”

Section: Study Sitesmentioning

confidence: 98%

“…However, storm water continues to pollute the lake despite that and, in 2006, three major storm water and/or agricultural drain outlets were either diverted or amended with precipitation/infiltration ponds to remove particulate nutrients. This resulted in a *30% reduction of the external P load to 346 kg P year -1 , predicted to yield an annual average lake water TP of 0.086 mg l -1 according to the model by Vollenweider (1976), provided that the internal P loading could be stopped (Egemose & Jensen, 2009). In October 2006 poly-Al chloride (52 g Al m -2 ) was applied to the bottom area deeper than 2 m water depth.…”

Section: Study Sitesmentioning

confidence: 98%

Evaluation of aluminum treatment efficiency on water quality and internal phosphorus cycling in six Danish lakes

2015

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If dosed sufficiently relative to the pool of excess phosphorus (P) in the lake sediment and lake water, aluminum (Al) is hypothesized to block sediment P release and thereby improve water clarity in eutrophic lakes. Aluminum has been used in [200 lakes worldwide, but in some 30% of the known cases water clarity did not improve beyond the first year, likely because of underdosing or continued high external P loading. We evaluate the viability of the aluminum dosing hypothesis for six Danish lakes that received Al in a molar ratio of \2-10 relative to the potentially mobile P pool. Lake water total P declined to values that could be predicted from the external P loading but increased again in the two lakes receiving the lowest Al doses. Lasting ([2-3 years) improvement of water clarity was only observed in two lakes. Sediment P release rates, which were measured in four lakes, declined significantly but then increased gradually again in the two lakes receiving the lowest doses. We conclude that if external P-loading is sufficiently low, lasting improvement of water quality can be obtained if Al is dosed 10:1 or higher relative to the size of the mobile P pool.

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“…Very little data are available on the partitioning of P in urban runoff, but even if more data were generated, it is unlikely that a general trend would occur. In the study of Lake Nordborg by Egemose and Jensen (2009), particulate P made up 34 ± 10% of the total P input from the urban area. Pitt el al.…”

Section: Nutrients and Organic Mattermentioning

confidence: 99%

A Minimum Data Set of Water Quality Parameters to Assess and Compare Treatment Efficiency of Stormwater Facilities

2011

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Urban stormwater runoff is often of poor quality, impacting aquatic ecosystems and limiting the use of stormwater runoff for recreational purposes. Several stormwater treatment facilities (STFs) are in operation or at the pilot testing stage, but their efficiencies are neither well documented nor easily compared due to the complex contaminant profile of stormwater and the highly variable runoff hydrograph. On the basis of a review of available data sets on urban stormwater quality and environmental contaminant behavior, we suggest a few carefully selected contaminant parameters (the minimum data set) to be obligatory when assessing and comparing the efficiency of STFs. Consistent use of the minimum data set in all future monitoring schemes for STFs will ensure broad-spectrum testing at low costs and strengthen comparability among facilities. The proposed minimum data set includes: (i) fine fraction of suspended solids (<63 μm), (ii) total concentrations of zinc and copper, (iii) total concentrations of phenanthrene, fluoranthene, and benzo(b,k)fluoranthene, and (iv) total concentrations of phosphorus and nitrogen. Indicator pathogens and other specific contaminants (i.e., chromium, pesticides, phenols) may be added if recreational or certain catchment-scale objectives are to be met. Issues that need further investigation have been identified during the iterative process of developing the minimum data set.

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Phosphorus forms in urban and agricultural runoff: Implications for management of Danish Lake Nordborg

Cited by 20 publications

References 22 publications

Modeling the Ecological Impact of Phosphorus in Catchments with Multiple Environmental Stressors

Modeling the Ecological Impact of Phosphorus in Catchments with Multiple Environmental Stressors

Evaluation of aluminum treatment efficiency on water quality and internal phosphorus cycling in six Danish lakes

A Minimum Data Set of Water Quality Parameters to Assess and Compare Treatment Efficiency of Stormwater Facilities

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