Evaluation of the ability of vegetation recovery after human disturbance in fragile tropical forests on nutrient-poor soils
| Project/Area Number |
19780125
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
林学・森林工学
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| Research Institution | Forestry and Forest Products Research Institute |
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Principal Investigator |
MIYAMOTO Kazuki Forestry and Forest Products Research Institute, 四国支所, 主任研究員 (60353877)
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| Project Period (FY) |
2007 – 2009
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| Project Status |
Completed (Fiscal Year 2009)
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| Budget Amount *help |
¥2,980,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥480,000)
Fiscal Year 2009: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2008: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2007: ¥900,000 (Direct Cost: ¥900,000)
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| Keywords | 熱帯ヒース林 / ケランガス / ポドゾル / 萌芽 / 炭水化物 / 窒素 / 実生 / 比根長 / ヒース林 / Dacrydium pectinatum / Hopea pentanervia / ボルネオ / 空間分布 |
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| Research Abstract |
Sprouting ability and seedling traits in relation to regeneration were examined for three dominant species (Dacrydium pectinatum, Podocarpaceae ; Hopea pentanervia, Dipterocarpaceae ; Tristaniopsis sp., Myrtaceae) to assess the ability of vegetation recovery after human disturbance such as logging and forest fire in a tropical heath forest on nutrient-poor soils in Nabawan, Sabah, East Malaysia (Borneo Island). Seedlings of Dacrydium and Tristaniopsis allocated more biomass to root than Hopea. Tristaniopsis seedlings showed a higher specific root length of fine roots suggesting effective nutrient uptake. The number of newly sprouted shoots per stump 6-8 months after stem cutting experiment was greater in Hopea (10.8 shoots on average) than the other two species. Sprouts were rarely observed in Tristaniopsis (0.3) and no sprouts in Dacrydium. Total non-structural carbohydrates concentration and nitrogen concentration of stem and root were higher in Hopea than the other two species, suggesting that large carboydrate reserves and high nitrogen availability support the sprouting ability in Hopea. Thus, among the three dominant species, only Hopea had a vigorous sprouting ability, indicating that quick vegetation recovery by sprouting after human disturbance would not be expected in this forest. Results suggest that tropical heath forest on nutrient-poor soils is vulnerable to human disturbance, although seedling regeneration can partly contribute to the vegetation recovery.
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Report
(4 results)
Research Products
(4 results)
