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[A-5.3 Effects of enhanced UV-B on Forest Vegetation and their adaptation mechanisms]

[Contact Person]

Michiaki Okano
Senior Researcher
De pt. of Forest Environment
Forestry and Forest Products Research Inst.
Forestry Agency, Ministry of Agriculture, Forestry and Fisheries
1 Matsuno-sato, Knkizaki-machi, Inashiki-gun, Ibaraki 305,JAPAN
Phone +81-298-73-3211 (Ext.373), Fax +81-298-74-3720
e-mail okanom@ffpri.affrc.go.jp

[Total Budget for FY1993-FY1995]

30,668,000Yen (FY1995: 11,915,000 Yen)

[Abstract]

The spectral radiation transmission model of the canopy(Ohtani et al., 1993) was applied to evaluate UV-B environment in forest canopy. The amount of ultraviolet rays which reached to forest floor was presumed attenuation by about 1/2 orders in rough vegetation(LAI=1) and 2 orders in closed vegetation(LAI=5) compared with strength irradiated on the crown. It was shown that attenuated in vegetation(LAI=10) closely closed more than four orders and UV-B reached the forest floor hardly.
　A regional difference of spectral radiation density was large. Evalution of UV-B in alpine area suggested that intense UV-B existed where the altitude was high and showed equivalent larger in alpine.
　The UV-B irradiation experiment was executed to the plant influence investigation of ultraviolet rays. Especially, the damage of the leaves was remarkable. Damege with form change and withering of the seedling was received by irradiating strength UV-B in Spruce and Beech. It was clarified that there was a possibility for the ultraviolet rays irradiation to exert the change in the form and the influence of the control of the growth etc. on seedlings by the actual experiment.

[Key Words]

UV-B, Forest Vegetation, Biological impact