| Project/Area Number |
03660146
|
|---|
| Research Category |
Grant-in-Aid for General Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
林学
|
|---|
| Research Institution | Iwate University |
|---|
Principal Investigator |
HASHIMOTO Ryoji Iwate UniV.Agric, Professor, 農学部, 教授 (80109157)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
SUGITA Hisashi Iwate Univ. Agric. Assitant Professor, 農学部, 助手 (60154473)
|
|---|
| Project Period (FY) |
1991 – 1993
|
| Project Status |
Completed (Fiscal Year 1993)
|
| Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1993: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1992: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1991: ¥1,300,000 (Direct Cost: ¥1,300,000)
|
|---|
| Keywords | hiba arborvitae / regeneration process / seedling survival / leaf carbon gain / light regime / creeping branch propagation / 森林の更新 |
|---|
| Research Abstract |
Light compensation points of young growths of hiba arborvitae were in the range of 4 to 6 umol quanta m^<-2> s^<-1> : they do not have particularly lower compensation points but rather higher values compared with other woody species growing on the same forest floors. Between young growths of hiba arborvitae and mizunara oak there were no large differences in the light compensation point, except for the new leaf expansion season. However, light-saturated rates of net photosynthesis were obviously high in hiba arborvitae. Hiba arborvitae young growths, attaching evergreen leaves, performed active photosynthetic production in two seasons, before new foliage emergence and after foliage fall of the overstory deciduous trees, because of the significantly high solar radiant energy reaching under the forest canopy during the seasons. Seedlings of deciduous mizunara oak were heavily shaded throughout the growing season by foliage of the overstory trees, and it resulted in low daily surplus production. From the repeated census of the young growths it was apparently hard for mizunara oak to survive for more than three or five years after germination. In contrast the young growths of hiba arborvitae did not wither and die and their distribution density was rather increased by so called creeping branch propagation. Such growth and development of the hiba arborvitae young growth population would be provided by the resource availability peculiar to under the forest canopy dominated by deciduous trees.
|
