We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Long-Term Oxbow Lake Trophic State under Agricultural Best Management Practices.
- Authors
Lizotte Jr., Richard E.; Yasarer, Lindsey M. W.; Bingner, Ronald L.; Locke, Martin A.; Knight, Scott S.
- Abstract
A key principle of agricultural best management practices (BMPs) is to improve water quality by reducing agricultural-sourced nutrients and associated eutrophication. Long-term (1998–2016) lake summer trophic state index (TSI) trends of an agricultural watershed with agricultural best management practices (BMPs) were assessed. Structural BMPs included vegetative buffers, conservation tillage, conservation reserve, a constructed wetland, and a sediment retention pond. TSI included Secchi visibility (SD), chlorophyll a (Chl), total phosphorus (TP), and total nitrogen (TN). Summer TSI 1977 was >80 in 1998–1999 (hypertrophic) and decreased over the first 10 years to TSI 1977 ≈ 75 (eutrophic). TSI 1977 decrease and changing TSI deviations coincided with vegetative buffers, conservation tillage, and conservation reserve. The TSI(SD) decrease (>90 to <70) coincided with vegetative buffers and TSI(TP) decrease (>90 to <75) coincided primarily with conservation tillage and the sediment retention pond. TSI(Chl) increase (<60 to >70) coincided with conservation tillage and vegetative buffer. Results indicate watershed-wide BMPs can modestly decrease summer trophic state through increased water transparency and decreased TP, but these changes are off-set by increases in chlorophyll a to reach a new stable state within a decade. Future research should assess algal nutrient thresholds, internal nutrient loading, and climate change effects.
- Subjects
CONSERVATION tillage; TROPHIC state index; BEST practices; CONSTRUCTED wetlands; WATER quality; EUTROPHICATION control
- Publication
Water (20734441), 2021, Vol 13, Issue 8, p1123
- ISSN
2073-4441
- Publication type
Article
- DOI
10.3390/w13081123