Source contribution to phosphorus loads from the Maumee River watershed to Lake Erie

Kast, Jeffrey; Apostel, Anna; Kalcic, Margaret; Muenich, Rebecca Logsdon; Dagnew, Awoke; Long, Christopher; Evenson, Grey R.; Martin, Jay F.

doi:10.1016/j.jenvman.2020.111803

Cited by 37 publications

(23 citation statements)

References 55 publications

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“…These are known to interact in a complex manner [56] and can contribute to source apportioned estimates that do not sum to Baseline loads. A similar observation was made by Kast et al [58].…”

Section: Contribution Of Phosphorus Sources and Land Usessupporting

confidence: 87%

“…These are known to interact in a complex manner [56] and can con ute to source apportioned estimates that do not sum to Baseline loads. A similar obse tion was made by Kast et al [58]. , (e) reduced legacy P and reduced inorganic fertilization (RedLP, RedFP), (f) zero legacy P and reduced inorganic fertilization (ZeroLP, RedFP), (g) Baseline legacy P and zero inorganic fertilization (BaseLP, ZeroFP), (h) reduced legacy P and zero inorganic fertilization (RedLP, ZeroFP), and (i) zero legacy P and zero inorganic fertilization (ZeroLP, ZeroFP).…”

Section: Contribution Of Phosphorus Sources and Land Usessupporting

confidence: 62%

“…It is also important to understand the contributions of various nutrient sources for formulating and optimizing BMPs and other water quality improvement measures. The incorporation of legacy nutrient algorithms in watershed models is an active area of research, while only a few studies have apportioned nutrient loads to legacy and other sources with mechanistic watershed simulation models [19,57,58].…”

Section: Introductionmentioning

confidence: 99%

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Watershed Response to Legacy Phosphorus and Best Management Practices in an Impacted Agricultural Watershed in Florida, U.S.A.

Khare

Paudel

Wiederholt

et al. 2021

Land

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Soil phosphorus (P) built up due to past management practices, legacy P, in the Lake Okeechobee Watershed (LOW) in south-central Florida, U.S.A., is often discussed as the root cause of lake eutrophication. Improvement of the lake’s water quality requires the identification of critical P sources and quantifying their contributions. We performed a global sensitivity analysis of the Watershed Assessment Model (WAM), a common evaluation tool in LOW environmental planning, using the Morris method. A pre-calibrated WAM setup (Baseline) of the LOW sub-watershed, Taylor Creek Nubbin Slough (TCNS), was used as a test case. Eight scenarios were formulated to estimate the contributions of various P sources. The Morris analysis indicated that total phosphorus (TP) loads were highly sensitive to legacy P in improved pastures, the major land use covering 46.2% of TCNS. The scenario modeling revealed that legacy P, inorganic fertilizers, and other sources contribute 63%, 10%, and 32%, respectively, to the Baseline TP load of 111.3 metric tons/y to the lake. Improved pastures, dairies, citrus, and field crops are the top TP load contributors. Our results have important implications for water quality improvement plans in the LOW and highlighted the need for accurate spatial mapping of legacy P and incorporation of such information in modeling efforts for watersheds demonstrating legacy P problems.

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Section: Contribution Of Phosphorus Sources and Land Usessupporting

confidence: 87%

Section: Contribution Of Phosphorus Sources and Land Usessupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Watershed Response to Legacy Phosphorus and Best Management Practices in an Impacted Agricultural Watershed in Florida, U.S.A.

Khare

Paudel

Wiederholt

et al. 2021

Land

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“…External pollution control is a com-plex process that requires the cooperation of local governments and nature reserves to establish discharge permit systems and buffer-zones before the drainage of agricultural waste into lakes, as well as tourism and fishing control. Furthermore, local governments should monitor and control upstream and non-point nutrient discharge (Kast et al, 2021). Multiple-pollutant discharge permit systems could also be established (Imani et al, 2017) between nature reserves and external pollutant producers and emitters.…”

Section: Recommendations Regarding Lake Water Quality Managementmentioning

confidence: 99%

Characterization of Water Quality in Xiao Xingkai Lake: Implications for Trophic Status and Management

Wen

et al. 2021

Chin. Geogr. Sci.

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Increasing cases of lake eutrophication globally have raised concerns among stakeholders, and particularly in China. Evaluating the causes of eutrophication in waterways is essential for effective pollution prevention and control. Xiao Xingkai Lake is part of and connected to Xingkai (Khanka) Lake, a boundary lake between China and Russia. In this study, we investigated the spatio-temporal variabilities in water quality (i.e., dissolved oxygen (DO), total nitrogen (TN), total phosphorus (TP), chemical oxygen demand (COD Mn ) and ammonium-nitrogen (NH 4 + -N)) in Xiao Xingkai Lake, from 2012 to 2014, after which a Trophic Level Index was used to evaluate trophic status, in addition to the factors influencing water quality variation in the lake. The DO, TN, TP, COD Mn and NH 4 + -N concentrations were 0.44-15.57, 0.16-5.11, 0.01-0.45, 0.16-48.31, and 0.19-0.78 mg/L, respectively. Compared to the Environmental Quality Standards for surface water (GB 3838−2002) in China, the lake transitioned to an oligotrophic status in 2013 and 2014 from a mesotrophic status in 2012, TN and TP concentrations were the key factors influencing water quality of Xiao Xingkai Lake. Non-parametric test results showed that sampling time and sites had significant effects on water quality. Water quality was worse in summer and in tourism and aquaculture areas, followed by agricultural drainage areas. Furthermore, lake water trophic status fluctuated between medium eutrophic and light eutrophic status from September 2012 to September 2014, and was negatively correlated with water level. Water quality in tourism and aquaculture sites were medium eutrophic, while in agricultural areas were light eutrophic. According to the results, high water-level fluctuations and anthropogenic activities were the key factor driving variability in physicochemical parameters associated with water quality in Xiao Xingkai Lake.

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“…In the Western Lake Erie Basin (WLEB), the single greatest contributor to P loads is the agriculturallyintensive Maumee River watershed (Maccoux et al, 2016). Separate studies estimated that legacy-P sources account for 34-66% (Stackpoole et al, 2019) or 39-49% (Kast et al, 2021) of the annual total P load discharged by the Maumee River. The GLWQA and subsequent action plans (Ohio Lake Erie Commission, 2018; United States Environmental Protection Agency, 2018) have established annual loading targets of 860 metric tons of total P and 186 metric tons of dissolved reactive P for the Maumee Basin-a 40% reduction from 2008 loads (Ohio Lake Erie Commission, 2018).…”

Section: Introductionmentioning

confidence: 99%

A Public-Private Partnership to Locate Fields for Implementation and Monitoring of Best Management Practices to Treat Legacy Phosphorus

Brooker

D’Ambrosio

Jones

et al. 2021

Front. Sustain. Food Syst.

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Legacy nutrients stored in agricultural soils are a substantial component of riverine nutrient discharge contributing to the eutrophication of aquatic ecosystems. These nutrient loads can persist and delay water quality initiatives, for example, those of the Great Lakes Water Quality Agreement which seek to reduce phosphorus (P) loads entering the Western Lake Erie Basin. In this watershed, approximately 5% of fields have P concentrations 2.5-fold greater than the maximum agronomic recommendations for corn and soybeans. Fields with these elevated-P concentrations (>100 mg P kg−1 soil) act as a source of legacy-P and discharge greater P loads. Implementing best management practices to treat runoff from these fields is desirable but finding them has been a challenge as soil test data are proprietary information creating an asymmetric information barrier. To overcome this barrier, we formed a public-private partnership that included agricultural retailers who conduct soil testing for farmers. Agricultural retailers who partnered with this project provided their soil P data and contacted farmers to gauge their interest, maintaining privacy for farmers until they expressed interest. Only 3.8% of soil samples in the provided data had elevated-P concentrations. In many cases, these elevated-P soils were confined to zones within fields, and 13% of fields had at least one elevated-P zone. We pursued these elevated-P fields as research sites for the implementation and monitoring of management practices. The agricultural retailers contacted 77 farmers with surveys, and 25 responded with interest in meeting the research team to discuss the project. Following a preliminary evaluation with the spatial data of fields operated by interested farmers, visits were arranged so that 12 research sites could be located. As indicated through the surveys, discussions with farmers, and soil data, many of the fields had accumulated elevated-P due to historic land-use (livestock, manure, or biosolid application) creating legacy sources. We conclude that public-private partnerships featuring agricultural retailers are a promising tool that may help overcome asymmetric information barriers to finding and managing agricultural fields with legacy-P that that disproportionately contribute to nutrient runoff.

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Source contribution to phosphorus loads from the Maumee River watershed to Lake Erie

Cited by 37 publications

References 55 publications

Watershed Response to Legacy Phosphorus and Best Management Practices in an Impacted Agricultural Watershed in Florida, U.S.A.

Watershed Response to Legacy Phosphorus and Best Management Practices in an Impacted Agricultural Watershed in Florida, U.S.A.

Characterization of Water Quality in Xiao Xingkai Lake: Implications for Trophic Status and Management

A Public-Private Partnership to Locate Fields for Implementation and Monitoring of Best Management Practices to Treat Legacy Phosphorus

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