2004 Fiscal Year Final Research Report Summary
Environmental variation and forest dynamics in the terrestrial regions around the Sea of Okhotsk
| Project/Area Number |
14405002
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 海外学術 |
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| Research Field |
生態
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| Research Institution | Hokkaido University |
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Principal Investigator |
HARA Toshihiko Hokkaido Univ., Inst.of Low Temp.Sci., Prof., 低温科学研究所, 教授 (80183094)
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| Co-Investigator(Kenkyū-buntansha) |
SUMIDA Akihiro Hokkaido Univ., Inst.of Low Temp.Sci., Asso.Prof., 低温科学研究所, 助教授 (50293551)
ONO Kiyomi Hokkaido Univ., Inst.of Low Temp.Sci., Inst., 低温科学研究所, 助手 (50344502)
SONE Toshio Hokkaido Univ., Inst.of Low Temp.Sci., Inst., 低温科学研究所, 助手 (10222077)
HOMMA Kosuke Niigata Univ., Fac.of Agr., Asso.Prof., 農学部, 助教授 (50323960)
YAMAGATA Kotaro Joetsu Univ.of Education, Inst., 地理学, 助手 (80239855)
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| Project Period (FY) |
2002 – 2004
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| Keywords | boreal forest / forest dynamics / environmental stress / photosynthesis / chlorophyll fluorescence / succession / reproductive strategy / survival strategy |
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| Research Abstract |
We made re-measurements (stem diameter, tree height, mortality, recruitment, photosynthesis, chlorophyll fluorescence) of trees (Larix cajanderi, Betula platyphylla), in the three boreal forests with different successional stages in Kamchatka, Russia, that we established 3-5 years before. The number of Larix seedlings per ha was almost constant irrespective of successional stage. The photosynthetic rate of Larix was higher than that of Betula. The degree of photooxidative stress in the photosynthetic system (which is magnified by low temperature and/or low precipitation) was smaller in Larix than in Betula. Betula produced a larger number of seedlings than Larix but the mortality rate got higher than Larix as succession proceeded. At the same time, Betula produced a large number of trunk suckers at the base of the mother trunk as clonal growth. These results suggest that Betula has advantageous reproductive and survival strategies at the early-successional stage, while Larix has those at the late-successional stage. Therefore, we conclude that Larix can be a dominant species in the Kamchatka boreal forest while Betula can form an early-successional forest under stressful conditions (low temperature, low precipitation) after large-scale disturbance such as forest fire in Kamchatka.
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