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Seed production and dispersal of four Lauraceae species in a tropical lower montane forest, Northern Thailand

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Author(s): Kriangsak Sri-Ngernyuang1

Journal: Maejo International Journal of Science and Technology
ISSN 1905-7873

Volume: 1;
Issue: 01;
Start page: 73;
Date: 2007;
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Keywords: Doi Inthanon National Park | Lauraceae | seed dispersal | seed production | tropical montane forest

ABSTRACT
Seed production and seed dispersal of two pioneer (Litsea cubeba and Lindera metcalfiana) and two shade-tolerant species (Cinnamomum soegengii and Cryptocarya densiflora) of Lauraceae were studied at a tropical lower montane forest in Doi Inthanon National Park, northern Thailand. Mature seed fall was monitored weekly to monthly using seed traps or belt transects for 1-3 trees per species. During the two-year study period, we observed only one fruiting episode for each of ten sample trees. Fruiting period was synchronized within each species, while there was no overlap in fruiting among the species. The seed fall periods were relatively short in Litsea (16-54 days), Lindera (25-65 days) and Cinnamomum (69 days), while quite long in Cryptocarya (159-187 days). The seed dispersal distance was short for all the species (< 12 m), and the density of seed dispersal had a mode at 0-2 m from the center of the canopy. The total seed production of each tree was estimated by a Weibull seed dispersal model as 93-6029, 985-3977, 1035-8910 and 6331 for Lindera, Litsea, Cryptocarya and Cinnamomum, respectively. Total fruit dry weight of each tree was estimated to be comparable to the leaf dry weight for Cryptocarya and Cinnamomum, while less than 3% of the leaf dry weight for Lindera and Litsea.
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