Abstract
Soil: Plant nutrient status in naturally regenerated garjan (Dipterocarpus turbinatus Gaertn.) seedlings of 3, 9, 15, 21, 27 and 33 months old were studied in twelve stands of three sites on late and early monsoon during 1994 to 1995 in Dulahazara garjan forest of Cox’s Bazar forest division. Soil samples were collected from two profiles (i.e. top soil and sub soil) of twelve stands in three sites. Soil moisture content, pH, texture, electrical conductivity, cation exchange capacity, organic carbon, total N and available P, K, Ca, Mg, Mn and Fe were determined. Soils were found to be silty loam to sandy loam with an average pH of 5.06. The average values of organic carbon and cation exchange capacity were 0.74% and 6.23 meq/100g respectively. The soils were poor in total nitrogen (689 μg g-1) and the average values of available mineral nutrients such as P, K, Ca, Mg, Mn and Fe in soil were 3.15, 53, 40, 47, 36 and 0.94 μg g-1, respectively. The soil in site -S2 appeared to be more fertile than those of site-S1 and site-S3. The average values of N, P, K, Ca, Mg, Mn and Fe in leaf- bud were found to be 1.80, 0.13, 0.94, 0.72, 0.23, 0.06 and 0.014% respectively. Leaf-bud nutrients showed a marked variation both with seasons as well as ages. Leaf-bud of late monsoon contained higher concentrations of P, Mg and Ca compared to leaf-bud of early monsoon which contained higher concentrations of N, K and Fe. Nutrient cycling in soil:leafbud system of regenerated garjan seedling of 3-33 months old varied with seasons and ages. The present study reveals that concentrations of Mn were significantly correlated between leaf-bud and soil whereas P showed the negative correlation indicating that in spite of low quantity of P in the soil, leaf bud had higher quantity.
 Jahangirnagar University J. Biol. Sci. 7(2): 79-88, 2018 (December)
Highlights
Garjan (Dipterocarpus turbinatus Gaertn.) is a lofty evergreen tree, attaining a height of about 46 m and a girth of about 5 m with a long clean cylindrical bole and an elevated crown (Troup, 1921)
With this view in mind, the present investigation was undertaken to study the nutrient status of garjan seedlings leaves of different ages that will be helpful for understanding the nutrient cycling pattern of the plants
The nutrient status of the terminal leaf-bud of the regenerated seedlings of different ages and the nutrient content of the soils surrounding the roots of the regenerated garjan (Dipterocarpus turbinatus Gaertn.) seedlings were determined to account for the nutrient cycling in the soil-plant system of the regenerated seedlings
Summary
Garjan (Dipterocarpus turbinatus Gaertn.) is a lofty evergreen tree, attaining a height of about 46 m and a girth of about 5 m with a long clean cylindrical bole and an elevated crown (Troup, 1921). Variation in foliar nutrient concentrations within the same species due to tree age, age of leaf, development stage, crown diameter, position of leaves in the crown, crown height , canopy closer, season and for growing in differentially fertile soils were reported (Helmissari, 1990). It is a fact that nutrient cycling does affect the growth of developing seedlings but seed germination and seedling establishment of a tree species is important for its sustainable development. With this view in mind, the present investigation was undertaken to study the nutrient status of garjan seedlings leaves of different ages that will be helpful for understanding the nutrient cycling pattern of the plants. Nutrient cycling patterns in soil: plant system of naturally regenerated garjan seedlings of varying ages in natural garjan forest floor of Cox’s Bazar will explore a new dimension of natural garjan regeneration maintaining harmony with edaphic factors
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