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Pb dating was conducted to examine the influence of land use changes in the forest catchment on lake sedimentation. The Kushiro River, into which Lake Takkobu drains under regular flow conditions, contributed to an increased sedimentation rate in sampling point at the lake outflow because turbid water from the Kushiro River flows back into Lake Takkobu during floods. The elevated sediment flux from the catchment dilutes the Pb concentration in sampling points at the inflow of the Takkobu River and the lake outflow, which causes fluctuations in the Pb concentrations in sediment cores. The Pb dating was estimated using the CRS (Constant rate of Supply) model. The dates by the CRS model in Lake Takkobu profiles were in good agreement with the dates by Cs. Sedimentation rates reconstructed for the past 100-150 years suggested that sedimentation rates increased drastically following land use changes. While a natural sedimentation rate of 0.01-0.03 g/cm/year is observed until the 1880s, whereas lake sedimentation accelerated to 0.03-0.09 g/cm/year following land use changes such as deforestation and channelization, between the 1880s and 1940s. In particular, the sedimentation rates have been associated with deforestation, channelization, agricultural development and road construction, since the 1980s, and these rates were about 9-28 times higher than those under natural conditions, leading to accelerated lake shallowing.

Recent Changes of Sedimentation Rate in Lake Takkobu, Northern Japan, Determined210Pb Dating

Recent Changes of Sedimentation Rate in Lake Takkobu, Northern Japan, Determined²¹⁰Pb Dating