Forest Soil and Litter as Filtering Media for Suspended Sediment

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A series of two filtration experiments were conducted to evaluate the filtration function of forest soil experimentally. The first experiment evaluated the differences between the filtration capabilities of the A_0 horizon and A horizon, and the effect of overstory species on the filtration function of the A_0 horizon. Undisturbed A_0, A and A_0+A horizons were collected for the filter mediums with cylindrical samplers. Leaves of Quercus serrata, Quercus myrsinaeforia, Sasa senanensis, Pinus densiflora, Chamaecyparis obtusa, and Cryptomeria japonica were also packed in the samplers. Various suspended sediment concentration of water were sprayed at constant intensity on the surface of samples. Filtering coefficients were not affected by SS concentration in all samples, and the order of filtering coefficient was: A_0 horizons>A_0+A horizons>A horizons in undisturbed forest soil samples, and Quercus serra-ta>Sasa senanensis>Quercus myrsinaeforia>pinus densiflora≒Chamaecyparis obtusa>Cryptomeria japonica in leaf samples. These results led to the conclusion that SS from managed forests can best be prevented by buffer zones where a thick A_0 horizon is maintained. The second experiment evaluated the effect of turbid water supply rate on the filtration capacity. Undisturbed A horizons and four leaf types, Quercus serrata, Pinus denslflora, Chamaecyparis obtusa, and Cryptomeria japonica were used as filter mediums. Filtering coefficients were inversely proportional to supply rate of turbid water in all samples.
日本森林学会の論文
1997-02-16

Forest Soil and Litter as Filtering Media for Suspended Sediment

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