Laboratory of Silviculture Tetsuo OKANO Professor, Ph.D. Long term dynamics, Forest regeneration, Plant sociology, Silviculture and Forest Soils. To get the forest ecosystem services sustainably in the changing world, the ecological and reasonable forest management is required. To realize our object, we try to understand the behavior of woody plants, the dynamics of forest ecosystems and their response to the human activity. Because forest ecosystems react sluggishly to natural disturbances and human impacts, and their responses are different depending on field characteristics, we adopt three strategy in our laboratory: (1) simple long term monitoring, (2) accumulation data based on practical field work, (3) comparison the field data with the theoretical models. Life History and its strategy of Woody Plants: Woody plants represent various shape and size. However, we can find the rules such as the pipe model, the elasticity model and so on. We try to integrate them under the concept of the metabolic ecology. A B C D A B C 写真、図 Long term monitoring site in natural oak forest in Hokkaido. Research on damaged tree. 写真、図 Long term monitoring site in Kiso to examine the regeneration process of Hinoki cypress. Vegetation Structure and Dynamics: Different plant species and its population is a unit of the vegetation. The competitive and cooperative interactions among resource and environment will result their relationships. Silviculture and Forest Management: The objects of silviculture has been changed in the history. We try to act the conservation biodiversity in artificial forest with low cost. We also try to success the recruitment of trees in disturbed or sasa-covered land. Environmental Symbiosis Science Division 26 Laboratory for Watershed Conservation Shinya HIRAMATSU Professor, Ph.D. Hillslope stability Hydrologic properties in forest soil Landslides model Debris flow Sediment yield In Japan, sediment-related disasters occur frequently due to brisk sediment yield and sediment discharge. To prevent disasters affecting our lives and property, accurate prediction of such disasters is greatly needed. Therefore, for disaster prediction , it is necessary to understand and make clear mechanisms of sediment production and sediment yield , and all processes that affect slope stability , such as rainfall infiltration and runoff . In our laboratory, we conduct research on mechanisms of sediment-related disasters such as hillsides landslides and debris flow in mountainous areas, and rainfall-runoff processes, based on field measurements and experiments, from the viewpoint of disaster prevention and watershed conservation. Effects of impact force caused by earthquake on slope stability A B C D A B C Field monitoring and impact assessment of trail erosion in the Kirigamine wetland in Nagano Influence of tree root systems on vertical infiltration processes of rainwater Studies on the effect of forest on soil stability and its limitation Monitoring of water in forest soil layer Exposed tree roots due to landslide implies the effect of forest on soil stability and its limitation Decayed root Φ5.0cm Schematic of water sampling Root 100cc Cylinder Environmental Symbiosis Science Division
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