Structure and dynamics of riparian forests in the warm-temperate region

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1.Riparian component of the lowland riparian forests in Yakushima IslandThrough comparisons with the flora of slope forests, components of riparian forests were categorized according to the features of river : 1)type of earth surface process (scouring vs. sedimentation), 2)spatial scale of catchment area. Main components of lowland riparian forests with high frequency of disturbance were deciduous trees which are common in cool-temperate forests2.Structure and dynamics of riparian forest in scouring areaStructure variations and disturbance regimes were investigated in an 1-order valley in the warmtemperate region. Topography severely affected to the species composition, tree size distribution and succession of secondary forests through the variaion in 1)light and soil moisture regimes, and in 2)the type and frequency of distrurbance.3.Structure and dynamics of riparian forest in sedimentation areaStructure of a natural forest on an alluvial fan in the warm-temperate region in southern Kyushu was investigated and compared with the forest structure on a slope. The slope stand was occupied by Distylium racemosum. On the other hand, Quercus gilva dominated in the alluvial fan associated by Acer palmatum and Cornus controversa on sediments of large rocks and by Ulmus Davidiana and Sapindus Mukoross on sediments of matrix. These variation of forest structure was affected by various types of disturbance providing different kind of regeneration habitats.