| Project/Area Number |
20580169
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Forest science
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| Research Institution | Yamanashi Forest Research Institute |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
下川 敏雄 (50196227)
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| Project Period (FY) |
2008 – 2010
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| Project Status |
Completed (Fiscal Year 2010)
|
| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2010: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2009: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2008: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | 森林生態 / 保護 / 保全 / 多様性 / 昆虫 / 甲虫 / 林冠 / 種数 / 種構成 / カラマツ林 / 侵入木 / 枯死材 / 環境要因 / カラマツ / カミキリムシ / ゾウムシ / ハムシ / コメツキムシ / ベニボタル |
|---|
| Research Abstract |
We studied the effects of long-rotation and related ecological variables on the biodiversity of six beetle families in larch(Larix kaempferi) plantations. Beetle diversity in the forest understory & the canopy of long-rotation and middle-aged plantations was compared. The relationships between the species richness of each beetle family and 24 ecological variables were identified. We found that beetle diversity tended to increase with long-rotation. Especially, phytophagies increased in the canopy. Among the 24 measured ecological variables, the species richness & abundance of naturally regenerated mature trees and the quality & quantity of coarse woody material had the strongest influences on beetle diversity. The former variable increased with long rotation, though the latter did not because thinned trees were left in middle-aged plantations as fallen logs. Therefore, the occurrence of naturally regenerated native trees that had grown sufficiently tall to reach canopy height in long-rotation plantations underpinned the improved biodiversity in larch plantations, contributing to native beetle species richness in these woodlands. Long-rotation makes plantations more heterogeneous, particularly in the canopy, and promotes greater native beetle diversity.
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