TY - JOUR
T1 - Modeling phosphorus reduction strategies from the international St. Clair-Detroit River system watershed
AU - Dagnew, A.
AU - Scavia, Donald
AU - Wang, Yu Chen
AU - Muenich, Rebecca
AU - Kalcic, Margaret
N1 - Funding Information:
This work was funded by the Fred A and Barbara M Erb Family Foundation grant number 903. We appreciate the insights and advice offered by Lynn Vaccaro and Jennifer Read from the University of Michigan, and Kevin McKague from Ontario Ministry of Agriculture, Food and Rural Affairs.
Funding Information:
This work was funded by the Fred A and Barbara M Erb Family Foundation grant number 903. We appreciate the insights and advice offered by Lynn Vaccaro and Jennifer Read from the University of Michigan, and Kevin McKague from Ontario Ministry of Agriculture, Food and Rural Affairs.
PY - 2019/8
Y1 - 2019/8
N2 - Nutrient loading from nonpoint sources has degraded water quality in large water bodies globally. The water quality of Lake Erie, the most productive of the Laurentian Great Lakes bordering the United States and Canada, is influenced by phosphorus loads from the Detroit River that drains an almost 19,000 km2 international watershed. We used the Soil and Water Assessment Tool (SWAT) to evaluate a range of management practices to potentially reduce total phosphorus (TP) and dissolved reactive phosphorus (DRP) loads. Scenarios included both single practices and bundles of multiple practices. Single practice scenarios included fertilizer rate reduction (Rate) and sub-surface placement (PL), filter strips (FL), grassed waterways, cover crops (CC), wetlands (WT), controlled drainage, and changes in tillage practices. Bundle scenarios included combinations of Rate, PL, FL, CC, and WT with three adoption strategies: application on all applicable areas, on 55% of randomly selected applicable areas, and on 55% of high phosphorus yielding applicable areas. Results showed that among the single practice scenarios, FL, WT, PL, CC, and Rate performed well in reducing both TP and DRP loss from agricultural dominated sub-watersheds. Over all, the CC, FL, WT bundle performed best, followed by the CC, PL, WT bundle, reducing the load up to 80% and 70%, respectively, with 100% implementation. However, targeting high phosphorus yielding areas performed nearly as well as 100% implementation. Results from this work suggest that there are potential pathways for phosphorus load reduction, but extensive implementation of multiple practices is required.
AB - Nutrient loading from nonpoint sources has degraded water quality in large water bodies globally. The water quality of Lake Erie, the most productive of the Laurentian Great Lakes bordering the United States and Canada, is influenced by phosphorus loads from the Detroit River that drains an almost 19,000 km2 international watershed. We used the Soil and Water Assessment Tool (SWAT) to evaluate a range of management practices to potentially reduce total phosphorus (TP) and dissolved reactive phosphorus (DRP) loads. Scenarios included both single practices and bundles of multiple practices. Single practice scenarios included fertilizer rate reduction (Rate) and sub-surface placement (PL), filter strips (FL), grassed waterways, cover crops (CC), wetlands (WT), controlled drainage, and changes in tillage practices. Bundle scenarios included combinations of Rate, PL, FL, CC, and WT with three adoption strategies: application on all applicable areas, on 55% of randomly selected applicable areas, and on 55% of high phosphorus yielding applicable areas. Results showed that among the single practice scenarios, FL, WT, PL, CC, and Rate performed well in reducing both TP and DRP loss from agricultural dominated sub-watersheds. Over all, the CC, FL, WT bundle performed best, followed by the CC, PL, WT bundle, reducing the load up to 80% and 70%, respectively, with 100% implementation. However, targeting high phosphorus yielding areas performed nearly as well as 100% implementation. Results from this work suggest that there are potential pathways for phosphorus load reduction, but extensive implementation of multiple practices is required.
KW - Agricultural management practices
KW - Phosphorus load
KW - SWAT
KW - Scenario analysis
KW - Watershed modeling
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U2 - 10.1016/j.jglr.2019.04.005
DO - 10.1016/j.jglr.2019.04.005
M3 - Article
AN - SCOPUS:85065253794
SN - 0380-1330
VL - 45
SP - 742
EP - 751
JO - Journal of Great Lakes Research
JF - Journal of Great Lakes Research
IS - 4
ER -