2001 Fiscal Year Final Research Report Summary
Leaf turn-over rate of forest trees in tropical mountain forests
| Project/Area Number |
11691190
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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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 | KYOTO UNIVERSITY |
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Principal Investigator |
KIKUZAWA Kihachiro Kyoto University, Graduate School of Agriculture, Professor, 農学研究科, 教授 (50271599)
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| Co-Investigator(Kenkyū-buntansha) |
YUMOTO Takakazu Kyoto University, Center for Ecological Research, Associate Professor, 生態学研究センター, 助教授 (70192804)
KITAYAMA Kanehiro Forest and Forestry Products Research Institute, Chief Researcher, 主任研究官 (20324684)
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| Project Period (FY) |
1999 – 2001
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| Keywords | tropical mountain forest / leaf turn-over rate / leaf emergence / evergreenness / deciduousness |
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| Research Abstract |
Four issues of problems were investigated concerning leaf phenological events of forest trees namely. Emergence pattern, timing of leaf emergence, leaf longevity and leaf habit (deciduousness and evergreenness) in tropical mountain forests on Mt. Kinabalu, Borneo island Malaysia. All shoots studied in the present study showed evergreen habit at least from 1994 to 1999. Leaf order against leaf position showed two types of leaf-emergence patterns. Actual observation throughout one year also reveals that there are two types of leaf emergence patterns in each of forest types on the tropical montane forests. Timing of leaf emergence was also investigated. Since temperature is constant throughout a year, rainfall and nutrient flush were considered to be important as a cue and critical resource for the new leaf emergence. The effect of nutrient supply on the initiation of new leaf emergence was tested by an experiment where nutrogen and phosphorus were artificially supplied. Results suggested the significance of nutrient supply on new leaf emergence at least in some forests. Leaf longevity ranged from shorter than one year to longer than 5 years. In any of the forest zones studied, there were variations in leaf longevities. Flowering phenology and fruiting phenology of tree species were also investigated in relation to fruit dispersal by birds.
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