The seasonal change in phosphorus dissolution in Lake Biwa sediments / Tom Murphy, Michio Kumagai and Kim Irvine.: En13-5/01-215E-PDF

"Lake Biwa is the largest lake in Japan. It is the drinking water supply for 15 million people and has many endemic species. Unfortunately it is becoming more eutrophic and part of the problem is related to the release of phosphorus from sediments. We identified that the mineral vivianite (ferrous phosphate) is dissolving in the sediments of Lake Biwa, Japan. The dissolution of vivianite is enhanced by sulphur loading, largely from continental Asia. Direct treatment of the sediments is technically possible but would be expensive and innovative. Current sediment restoration in Japan is centered on sediment dredging. It is also expensive and has major limitations. In this paper we review how the concentration of dissolved phosphorus in lake sediments increased substantially from June to October, 2000. We used large in situ sediment diffusion chambers to measure this seasonal increase in phosphorus"--Management Perspective.

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