Humus and Phosphorus Composition of 3 Lake Sediments in Yamaguchi Prefecture

概要

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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). However, in order to gain a better understanding of the humus and phosphorus composition of lake sediments, the number of lake sediment samples should be increased. The objective of this study was, therefore, to investigate the humus and phosphorus composition of 3 lake sediments in Yamaguchi Prefecture, differing in the physiographical properties(Usui 1994).
社団法人日本土壌肥料学会の論文