Some Ecological Studies on Hopea Odorata Roxb. and Hopea Pubescens Ridl. Seedlings
In Malaysia, Hopea odorata Roxb. and Hopea pubescens Rid!. have the local names of Me raw an siput jantan and Merawan bunga, respectively; while in Laos, their local names are Mai khen heua and Mai khen respectively. H. odorata is fairly widely distributed in evergreen forests from mainland South...
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| Format: | Thesis |
| Language: | English English |
| Published: |
1998
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| Online Access: | http://psasir.upm.edu.my/id/eprint/9962/ http://psasir.upm.edu.my/id/eprint/9962/1/FH_1998_9_A.pdf |
| Summary: | In Malaysia, Hopea odorata Roxb. and Hopea pubescens Rid!. have the local
names of Me raw an siput jantan and Merawan bunga, respectively; while in Laos, their
local names are Mai khen heua and Mai khen respectively. H. odorata is fairly widely
distributed in evergreen forests from mainland Southeast Asia to the Andamand Islands,
Borneo and the Philippine Islands, while H. pubescens is only endemic to Peninsular
Malaysia. Both species belong to the Dipterocarpaceae, and are commercially important
timbers.
This project initially focused on the density, distribution, response to light of
seedlings under forest canopy, seedling mortality and growth of H. pubescens. The
project then focused on the influence of seed size on cumulative percentage germination
and early growth of H. odorata seedlings under different light regimes in the nursery.
The highest seedling density of H. pubescens was found to be 130 trees/subplot (of 25
m2) and the highest density of saplings was 68 trees/subplot. The distribution of
seedlings and saplings was most abundant within 10m around the parent tree and no
seedlings and saplings were found beyond 25m. The light intensity in the forest
fluctuated according to the canopy opening. The highest light intensity recorded in the
forest was 45.8%RLI and lowest at 3.0%RLI. The mortality of seedlings and saplings
was quite high up to 12.9% and 5.3%, respectively and high mortality occurred in areas
of high seedling density and where the light was low. In Plot 1, the mean annual
increment in diameter (MAID) of all saplings was 0.37±0.2mm and the mean annual
increment in height (MAIH) was 2.36±3.2cm. In Plot 2, the MAID of all saplings was
0.22±0.18mm and the MAIH was 3.02±4.29cm. Height and diameter increments of
saplings in the forest were lower than increments recorded in the nursery. |
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