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- Title
Effects of agricultural activities and best management practices on water quality of seasonal prairie pothole wetlands.
- Authors
Detenbeck, Naomi E.; Elonen, Colleen M.; Taylor, Debra L.; Cotter, Anne M.; Puglisi, Frank A.; Sanville, William D.
- Abstract
Long-term effects of within-basin tillage can constrain condition and function of prairie wetlands even after uplands are restored. Runoff was significantly greater to replicate wetlands within tilled basins with or without vegetated buffer strips as compared to Conservation Reserve Program restoration controls with revegetated uplands (REST). However, mean water levels for native prairie reference sites were higher than for REST controls, because infiltration rates were lower for native prairie basins, which had no prior history of tillage. Nutrient dynamics changed more in response to changes in water level and vegetation structure than to increased nutrient inputs in watershed runoff. Dissolved oxygen increased between dry and wet years except in basins or zones with dense vegetation. As sediment redox dropped, water-column phosphate declined as phosphate likely co-precipitated with iron on the sediment surface within open-water or sparsely vegetated zones. In response, N:P ratios shifted from a region indicating N limitation to P limitation. REST sites, with dense vegetation and low DO, also maintained high DOC, which maintains phosphate in solution through chelation of iron and catalysis of photoreduction. Reference sites in native prairie and restored uplands diverged over the course of the wet-dry cycle, emphasizing the importance of considering climatic variation in planning restoration efforts.
- Subjects
WATER quality; AGRICULTURE; WETLANDS; AQUATIC resources; SEASONS; CLIMATOLOGY
- Publication
Wetlands Ecology & Management, 2002, Vol 10, Issue 4, p335
- ISSN
0923-4861
- Publication type
Article
- DOI
10.1023/A:1020397103165