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Communication at the NABS Annual meeting, Keystone, 2000
(399) PHOSPHORUS-SEDIMENT INTERACTIONS IN LAKE EUCHA TRIBUTARIES.
Y.A. Popova, B.E. Haggard, D.E. Storm, and R.D. Tejral. Department of Biosystems and Agricultural Engineering, Oklahoma State University, Stillwater, Oklahoma 74074
Phosphorus (P) is often the limiting nutrient in aquatic ecosystems, and sediment may buffer increasing P loads and regulate dissolved P concentrations. In our study, we sampled benthic sediment from three
nonpoint source (NPS) and one point source (PS) impacted tributary(s) of Lake Eucha, in northeastern Oklahoma. Extractable P, P sorption index (PSI), zero equilibrium P concentration (EPCo), organic matter content, and particle size distributions were determined on each sediment sample, and samples were composited from the top 10 cm along 9 separate transects at each stream in the summer 1999 and winter 2000. Our results indicated an increasing trend between bioavailable P (BAP) and extractable P among all streams (log transformed, p<0.05), whereas PSI was not significantly correlated to any other sediment characteristics. EPCo was approximately 30-40% of the stream SRP levels, and among streams a significant increasing relationship existed between stream SRP and EPCo (log transformed, p<0.05). Increasing NPS or PS pollution typically increased mean EPCo, extractable P, and BAP in the benthic sediment while decreasing the buffering capacity. Increasing P sources within a particular basin may increase P bioavailability to aquatic organisms associated with the benthos, and reduce P retention by stream sediments.
Presented at 1:00 PM on Wednesday, May 31, 2000 in Nutrient Dynamics
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