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GROWTH OF BIG-LEAF MAHOGANY (SWIETENIA MACROPHYLLA) IN NATURAL FORESTS IN BELIZE

K. Shono and L. K. Snook
Journal of Tropical Forest Science
Vol. 18, No. 1 (January 2006), pp. 66-73
Stable URL: http://www.jstor.org/stable/43594648
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
GROWTH OF BIG-LEAF MAHOGANY (SWIETENIA MACROPHYLLA) IN NATURAL FORESTS IN BELIZE
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Abstract

The annual diameter measurements (four years) of 75 big-leaf mahogany (Swietenia macrophylla) trees in natural forests in northwestern Belize were analysed to determine growth rates. Mean diameter increment exceeded 1 cm year⁻¹, with slightly higher growth rates in trees < 50 cm dbh. Inter-individual variation in growth rates was significant, with the fastest-growing individuals growing at rates greater than 2 cm year⁻¹. Inter-annual variation in growth rates was also significant. The diameter growth of 1.21 ± 0.1 cm during a wetter year (1456 mm) exceeded by 75% the diameter growth of 0.69 ± 0.1 cm during a drier year (1181 mm). The study revealed that mahogany trees as small as 23 cm dbh that were left standing after harvests could be expected to attain the commercial diameter of 60 cm in the 40 years between cutting cycles. Data diameter tahunan (empat tahun) bagi 75 pokok mahogani berdaun besar (Swietenia macrophylla) yang tumbuh di dalam hutan semula jadi di bahagian barat laut Belize dianalisis untuk mengkaji kadar tumbesarannya. Pertambahan min diameter melebihi 1 cm setahun dengan pokokpokok >50 cm dbh merekodkan kadar pertumbuhan yang lebih sedikit. Variasi kadar pertumbuhan antara individu adalah bererti. Pokok yang tumbuh paling cepat tumbuh pada kadar melebihi 2 cm setahun. Variasi kadar pertumbuhan an tara tahun juga bererti. Diameter pokok (1.21 ± 0.1 cm) pada tahun yang lembap (1456 mm hujan) melebihi pertumbuhan (0.69 ± 0.1 cm) pada tahun yang kering (1181 mm hujan) sebanyak 75%. Kajian ini menunjukkan bahawa pokok mahogani sekecil 23 cm dbh jika dibiarkan selepas tebangan boleh mencapai diameter komersial iaitu 60 cm dalam masa 40 tahun antara pusingan tebangan.

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