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 (573Kb)
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71,383,000 Yen (FY1995 13,278,000 Yen)
Observations of suspended solids(SS) concentration, and surface runoff experiments in a watershed of tropical rain forest were conducted to assess mechanism of SS production. A clockwise hysteresis was recognized in relationship between discharge and SS concentration which was correlated with rainfall. Ignition loss showed an inverse relationship with SS concentration and converged at 30-40% indicating high organic content. Surface runoff on forest road during a storm produced SS concentration higher by 3 orders than that of the overland flow without rain drops. These results conclude that rain drop energy produces SS on damp areas near the stream. Approximately 130 species of wood decaying Basidiomycetes were recorded in the study site. Most species were tropical species that are restricted in tropical area, or tropical- subtropical area. Species compositions of wood decay fungi are different according to the substrata size. Species on smaller substrata were less affected by water potential and were suggested to be more tolerable against drought stress. Some species were suggested to be specific on Dipterocarpaceae species but most of very common species were probably not host specific. In many cases, single species colonized wide areas of single fallen trees. Most isolates obtained from different basidiocarps belonged to different clones that suggested populations of wood decay fungi on single trees are composed of mycelia that belong to a number of smaller genets in many cases.
Restoration Process, SS Production and Transport, Decomposition, Wood-Decay-Fungi