泥炭地の乾燥化と植生変化に伴うフェノール性化合物組成の変化

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In Bibai peatland in Hokkaido, Japan, the decomposition of peat is enhanced due to the drying tendency of the soil. Accordingly, the community of Sasa senanensis invades the community of Sphagnum, whose area is diminishing rapidly. Peat samples were collected from this peatland on a transect line which passes through the original Sphagnum community as well as the invading Sasa community. Peat samples were separated into fractions coarser and finer than 2 mm, and the contents of carbon and nitrogen, degree of humification and composition of phenolic CuO-NaOH oxidation products were analyzed. Yields of p-hydroxyphenyl compounds and vanillyl compounds were high at the sites where the Sphagnum community was conserved. On the other hand, syringyl and cinnamyl compounds were high at the sites where the community of Sasa senanensis had invaded the original high moor plant vegetation as a result of the drying tendency in the wetland. Differences in the yields of phenolic compounds between the fractions>2 mm and>2 mm were small at the sites of Sphagnum vegetation. In the peripheral region of the wetland where the drying tendency is extreme, the yields of phenolic compounds differed remarkably between different size fractions of peat. The yields of p-hydroxyphenyl compounds and vanillyl compounds in fractions finer than 2 mm were remarkably larger than those in the fractions coarser than 2 mm. An opposite tendency was observed for the yields of cinnamyl compounds. These results suggest that the p-hydroxyphenyl compounds and vanillyl compounds were formed from cinnamyl compounds as a result of the decomposition of the lignin component in peat. Highly significant positive correlations were observed between p-hydroxylphenyl compounds and vanillyl compounds, as well as between syringyl compounds and cinnamyl compounds. Negative correlations were observed between cinnamyl compounds and p-hydroxyphenyl compounds and cinnamyl compounds and vanillyl compounds. These results came from the tendency that p-hydroxyphenyl compounds and vanillyl compounds are rather representative of Sphagnum vegetation and syringyl and cinnamyl compounds are representative of angiosperm plants and grass vegetation. Thus, the composition of phenolic CuO-NaOH degradation products was proven to be a good indicator for representing the drying tendency and accompanied vegetation changes in wetlands.
社団法人日本土壌肥料学会の論文
1997-10-05

泥炭地の乾燥化と植生変化に伴うフェノール性化合物組成の変化

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