标题：Changes in the Concentrations of Fine Solids in Stream Water after Selective-cut Logging in the Forested Catchment, Central Hokkaido, Northern Japan.
摘要：Concentrations of total fine solids (TFS) and organic fine solids (OFS) in the stream water were measured from June to November in 2001 and 2002, in a forested catchment of 9.2 ha where selective-cutting had been carried out in the winter of 2001. TFS and OFS concentrations from the selective-cutting catchment were significantly higher after cutting as compared with those before cutting (1997). The significant difference in TFS concentrations between selective-cutting and control catchments was observed during the first year following the logging; average TFS concentration was higher in the selective-cutting catchment than that in the control. Ratio of OFS to TFS (=OFS concentration/TFS concentration), which reached a constant value as the stream discharge increased over a critical value were significantly lower during the period after logging as compared with that prior to logging. According to the observation at the disturbed area in the selective-cut catchment, the increase of inorganic component of TFS after logging seemed to result from sediment deposition below the skid trails adjacent to the stream.
