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
Aglaia cucullata (Roxb.) Pellegr. is a less salt-tolerant tree species of Sundarban mangrove ecosystem. The present study was conducted to investigate the influence of salinity on the survival and growth ofA. cucullata seedlings and nutrient distribution in seedling parts. All (100%) the seedlings of A. cucullata was found to survive at non-saline to slightly saline (0 to 5 PSU) condition and no seedlings were survived beyond 15 PSU salinity. Seedling growth in terms of biomass, height and collar diameter showed a significant (p<0.05) negative relationship with the salinity gradient. The highest concentration of nitrogen (42 to 25 mg/g) and potassium (34 to 30 mg/g) was found at leaves. While roots contained the highest phosphorous (4 to 3 mg/g) and sodium (34 to 13 mg/g). However, nitrogen, phosphorous and potassium in different parts ofseedlings showed significant (p >< 0.05) negative correlations with the salinity gradient, while sodium showed a significant (p < 0.05) positive correlation. In conclusion, A. cucullata is very sensitive to salinity for survival, growth and nutrient distribution in their parts, and that the distribution of this species may be confined only in the less saline areas of Sundarban.
A study was conducted from 1998 to 2001 in the Sundarban mangrove forests of
Bangladesh covering three salinity zones to determine the effect of deer (Axis axis) on the
newly recruited seedlings of sundari (Heritiera fames), gewa (Excoecaria agallocha), kankra
(Bruguiera sexangula), passur (Xylocarpus mekongensis), baen (Avicennia officinalis), goran
(Ceriops decandra) and amur(Amoora cucullata) in the fenced and unfenced plots. Tire browsing
effect of deer wasfound to vary from species to species because of differences in palatability.
A significant damage of deer was found in the regenerated seedlings of B. sexangula,
X. mekongensis, A. officinalis and H.fames. No significant effect was found for E. agallocha,
C. decandra and A. cucullata
A study was conducted from 1997 to 2000 to determine the effect offelling top dying
affected sundari (Heritiera fames) trees on the regeneration status in those areas of the
Sundarban. The newly recruited seedlings ofsundari (H.fames), gewa (Excoecaria agallocha)
and kankra (Bruguiera sexangula) were significantly higher in the felled areas compared to
unfelled areas almost all the years. But seedlings of passur (Xylocarpus mekongensis) and
goran (Ceriops decandra) were found significantly higher only in 1997 and 2000 respectively
and amur (Amoora cucullata) in 1997 and 1998 in the felled areas. Moreover, seedlings
recruitment of all species together was significantly higher in the felled areas. Among the
recruited seedlings, H. fames and E. agallocha constituted the highest numbers both in the
felled and unfelled areas. Therefore, salvage felling of the top dying affected sundari trees is
recommended to avoid wastage of wood and to improve regeneration status.
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