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Osman, K. T.
- Effects of some forest Tree Species on Soil Properties in Chittagong University Campus, Bangladesh
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Indian Forester, Vol 127, No 4 (2001), Pagination: 431-442Abstract
In the present study, a comparison was done between soil properties of forest plantations and adjacent unplanted plots at 14 sites within Chittagong University Campus. The sites were at nearly level topography and the soils were basically uniform with sandy loam to sandy clay loam, moderately to strongly acid, poorly fertile surface. Acacia auriculiformis A. Cunn. Ex. Benth., Eucalyptus camaldulensis Dehnh., Lagerstroemia speciosa (L.) Pers. And Swietenia mahagoni (L.) Jacq. Have been grown for various periods in each of three of the studied sites. In the remaining two sites, there were plantations of Hope a odorata Roxb. Data show that soils under the plantations had significantly higher organic carbon, total N, available K and Mg. On the other hand, both pH and available Ca were lower in soils under plantations than in the adjacent unplanted plots. The difference was more pronounced in the surface soil than the subsoil. The C/N, K/Ca, Mg/Ca and K/Ca + Mg ratios were higher in the plantations indicating substantial removal of N and Ca by the tree crops. However, there was no definite trend of variation in soil properties among the species and among sites within each species. This lack of differences might be due to the younger stage of the plantations.
- Foliar Nutrients of Six forest Tree Species Grown in Brown Hill Soils of Bangladesh
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Indian Forester, Vol 126, No 12 (2000), Pagination: 1279-1288Abstract
In the present investigation, foliar concentrations of N, P, K, Ca, Mg, Fe, Mn and Zn in two indigenous- Dipterocarpus costatus Gaertn F. and Dipterocarpus turbinatus Gaertn F. and four exotic forest tree species. Acacia auriculiformis A. Cunn. Ex. Benth., Acacia mangium Willd., Eucalyptus camaldulensis Dehnh. and Pinus caribaea Morelet. var. hondurensis Barr. and Golf. were determined. There was high variability in foliar K, Ca and Mn but low in P concentrations among the species. Within species variability was generally less than that between species. Foliar nutrients were not found to be correlated with soil nutrient supply.- Growth and Nutrient Dynamics of a Young Pinus caribaea Morelet Plantation on a Denuded Hill Soil of Bangladesh
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Indian Forester, Vol 123, No 2 (1997), Pagination: 127-135Abstract
A five year old Pinus caribaea Morelet var. hondurensis plantation on a denuded hill soil of Chittagong, Bangladesh produced trees having average height of 10.97m and dbh of 16.22 cm. Aboveground biomass was 79.9 mt/ha. Annual litterfall amounted to 7.51 mt/ha with 98% in the needles. Returns of N, P, K, Ca, Mg, Fe, Mn and Zn in litter were 29.08, 8.76,10.79,45.96,21.91,6.89,1.78 and 1.40 hg/ha/yr respectively. Concentration of these nutrients fluctuated in different time of the year and so did the amount of litterfall. Litterfall was biomass having a peak in April and another in July. Rate of needle litter decomposition differed with seasons. Needle litter placed in litter bags on soil surface of the plantation decomposed to 89 per cent within 360 days and released 94, 86, 85, 98,96,60,78 and 81 per cent of N, P, K, Ca, Mg, Fe, Mn and Zn respectively.- Effect of Forest Plantations on Soil Properties at Keochia Silvicultural Research Station, Chittagong
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Indian Forester, Vol 121, No 12 (1995), Pagination: 1108-1117Abstract
In the Keochia SiliviculturaI Research Station, Chittagong, Bangladesh, a semi-detailed soil survey was done in 1978. Afterwards plantations of Acacia auriculiformis, Acacia mangium, Eucalyptus camaldulensis and Pinus caribaea were established. The soil were presently analysed for certain physico-chemical properties. It has been found that the organic matter, total N, available K and pH of soils have increased by the plantations.- Performance of Gurjan (Dipterocarpus turbinatus) and Teak (Tectona grandis) in Pure and Mixed Plantations at Kaptai, Bangladesh
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Indian Forester, Vol 119, No 9 (1993), Pagination: 738-743Abstract
Height and diameter at breast height of 26 year old gurjan and teak trees at one mixed (60 per cent Tectona grandis, 30 per cent Dipterocarpus turbinatus, 7 per cent Syzygium grande and 3 per cent Amoora rohituka) one gurjan and two teak plantations at Kaptai/Bangladesh were measured. Teak produced significantly higher girth in the mixed whereas gurjan showed better growth both in height and diameter in the pure plantation. The poor growth of teak in these sites is due to the strong soil acidity and resulting low available phosphorus content. Higher moisture content on the other hand, was associated with an increase in growth of teak.- Performance of some Fast Growing Trees in the University of Chitagong, Campus.
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