Abstract
Abstract Most of the organic matter in lake sediments, as in soils, consists of heterogeneous and colored polymers collectively known as humic substances. It is considered that these substances play a major role in the geochemical cycle of carbon in lakes (Ishiwatari 1985). Humic substances can be divided into humic acid, fulvic acid, and humin fractions. Ishiwatari (1985) reported the distribution and optical properties of fractions extracted from 9 lake sediments. On the other hand, although phosphorus is an essential element for plant growth in lakes, phosphorus is often the main factor causing eutrophication (Vollenweider 1976). The release of phosphorus from lake sediments may be responsible for eutrophication, and may be related to the forms of phosphorus present. Some reports on the phosphorus composition of lake sediments have been published (Hosomi and Sudo 1979; Nakajima et al. 1979; Hurumai and Ohgaki 1982; Joh 1983).
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