Wood Utilization Laboratory Takashi TAKEDA Professor, Ph.D. •Mechanical properties of Japanese larch timber •Effects of kiln-drying on wood mechanics •Structural panels for prefabricated houses •Shinshu glued built-up beams. For greener future, wood utilization is the key to solve the global environmental problems because wood is one of the most environment-friendly character. The use of wood promotes strongly to prevent global warming due to its function of carbon sink: CO2 of 1 ton in wood of one cubic meter, and less fabrication energy compared among other materials. Research motivation is to promote wise wood utilization as materials for wooden houses and buildings. Main research subjects are (1) structural uses of wood and wood-based materials and development of new wooden materials, (2) mechanical properties of structural lumber kiln-dried by the high-temperature setting method, and (3) mechanical properties and durability of wooden structural panels In addition to those, various interested themes are environmental impact assessment by the LIME for pellet manufacturing, utilization of concrete-form plywood for civil engineering, and so on. A B C D A B C Fig. 2. Durability of structural panels for wooden prefabricated houses. Fig. 1. Static bending test for Shinshu glued built-up timber with GIR. Collaborative research with Nagano Prefecture Forestry Research Center (NPFRC) is continuing for developing Shinshu glued built-up timber. Static bending tests were conducted at NPFRC (Fig.1). We are also investigating on mechanical properties within cross section of them. Fig. 2 showed visual inspection for durability of wooden structural panels. In this test, the effects of water on durability was also investigated with water injection between the siding and plywood of the panel. Moisture content of inner plywood was measured for all test panels, and temperature and relative humidity were measured for some panels. Environmental Symbiosis Science Division Forest Ecology and Environment Hajime KOBAYASHI Associate Professor, Ph.D. Research Keywords; Artificial coniferous forests Carbon absorption Photosynthesis Forest management Timber production Forest dynamics In the Forest Environment and Ecology lab. we address various questions lying on forest ecosystem, particularly focusing on issues of importance to the society and environment. Recent themes we are tackling are as follows: Interactive effects of water and nitrogen on carbon dioxide absorption in artificial coniferous forests. Prospects of forest dynamics and carbon dioxide accumulation in sub alpine conifer forest under climate change. Verifying the effect of thinning on carbon dioxide budget on artificial coniferous forests. Photo upper right. Camping at lodge Shirabe, in the Nishikoma experiment forest, Shinshu univ.. A nice 90 minutes trekking is required to access to our comfortable lodge. Photo left. Installing open top chambers above the timber line (Alt. 2600m) at mount Shogigashira, located in the Nishikoma experiment forest, Shinshu univ. Photos. Right column upper: permanent plot in a secondary sub alpine conifer forest in the Nishikoma experiment forest, Shinshu univ.. Right column lower: measuring photosynthesis and transpiration rates of larix trees above 20m high from the ground. Middle column upper: measuring water potential of hinoki cypress shoots in the Terasawayama experiment forest, Shinshu univ.. Middle column lower: A huge rotten beech tree standing beside the trail to lodge Shirabe, in the Nishikoma experiment forest. Left column: cutting sixty-year-old hinoki cypress tree using chain saw for laboratory work. Environmental Symbiosis Science Division 21
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