BANGLADESH JOURNAL OF FOREST SCIENCE
A Half-yearly Peer Reviewed Journal of Bangladesh Forest Research Institute
A Half-yearly Peer Reviewed Journal of Bangladesh Forest Research Institute
Seed germination remains to be an unsolved problem in teak. Studies made on radiography and seed technological aspects using drupes from India and Thailand disclosed certain important features. Radiography has been standardised for sharp image to read the anatomical potential of seed. Teak drupes from two provenance differed in size and weight within and between seedlots. Radiograms revealed the development of 4, 3,2 and 1 seed in the tetracarpellary ovary in the order of 1,5,19 and 48% with 27% empty drupes. When drupe size decreased the percentage of
single-seeded and empty drupes increased correspondingly. Teak drupes possess ontogenic and dormancy problems posing challenge to germination
This paper describes the community structure of two prominant forest types i.e., moist deciduous miscellaneous and riverian Khair-Sissu forests of Himalayan foot hills in relation to their analytic and synthetic characters. The importance value index (IVI) values recorded from moist deciduous miscellaneous forest were maximum for Mallotus philippinensis (113.28) and minimum for Cassia fistula (6.54). Similarly the IVI values in the riverian Khair-Sissu forest were maximum (218.02) for Dalbergia sissoo and minimum (16.46) for Sapium insigne. The species diversity (2.3796), beta diversity (2.9166) and equitability (14.6700) values were observed as maximum in moist deciduous miscellaneous forest, whereas the values for these parameters were minimum (0.8507, 1.3636 and 2.4915 respectively) in the riverian Khair-Sissu forest. However, the values for concentration of dominance was maximum (0.6827) in riverian Khair-Sissu forest and minimum (0.1071) in moist deciduous miscellaneous forest. The soils in both the forest types were observed as alluvial, coarse textured and almost neutral in reaction.
The genus Xylocarpus (Family: Meliaceace) is represented by five species, namely X.australisicus Raidley, X. granatum Koening, X. molucccnsis Lamk. Roem, X. gangeticus Parkison and X. parvifolius, and they are distributed in the tropical mangrove forests (Saenger ct al. 1993). The two speciesX. granatum and X. molucccnsis are found also in the Sundarbans, Khulna (Chaffey and Sandom 1985) and Chakaria Sundarbans of Chittagong (Brandis 1906, Troup 1921).
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