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Seasonal Variation of Edaphic Features of Madhupur Sal Forest, Bangladesh

Ahmed Emdadul Hoque
Ecology Laboratory, Department of Botany University of Dhaka, Dhaka, Bangladesh

A. K. M. Nazrul-Islam
Ecology Laboratory, Department of Botany University of Dhaka, Dhaka, Bangladesh

S. M. Imamul Huq
Ecology Laboratory, Department of Botany University of Dhaka, Dhaka, Bangladesh

Abstract/ Executive Summary:

Seven stands were selected in different areas of the Madhupur Sal (Shorea robusta) forest to study the seasonal varation of available nutrients in soils. Soil samples were collected after every two months at two depths (top soil 0-10 cm and 10-20 cm) and their physicochemical properties were determined. The percentage of soil moisture was found to vary in different stands and pH values of soil ranged from 4.60 to 6.28. Seasonal fluctuation of electrical conductivity was observed. An increasing trend of sodium accumulation was found in both top and sub-soil layers at all the stands. The concentration of potassium also showed a decreasing tendency in both layers. The exchangeable calcium and magnesium contents did not show significant (pH 0.05) seasonal variation. The high values of manganese and iron were confined to top soil and values decreased down the profile.

Keywords: Shorea robusta, Soil, physico-chemical characteristics, Seasonal variation.

Location: Madhupur Sal forest, Bangladesh.

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Land development productivity

Objectives:

To identify the seasonal variation of edaphic features of Madhupur sal forest, Bangladesh.

Methodology:

Seven stands were selected in different areas of the Madhupur Sal forest to study the seasonal variation of available cations in soils. Soil samples were collected from the seven stands of Madhupur Sal forest with two months interval and their physico-chemical properties were determined. Four soil samples at two depths (top soil 0-10 cm and sub soil 10-20 cm) were collected randomly from each stand. Ten gram of each of the fresh soils were weighed and dried at 100°C + 5°C for 48 h. The moisture content of soil was determined from the difference in weights of the wet soil, and the dry soil and the results were calculated on the basis of dry weight. For the determination of pH values, 20 g of fresh soil was taken in a clean and dry 100 ml beaker. The soil was mixed with deionized water at a soil:water ratio of 1:5.Ten gram soil was weighed from each of the collected soil samples by digital electrical balance and was taken in 250 ml plastic beakers. 100 ml of Nammonium acetate adjusted to pH 7.0 were added in three increments (50 + 25 + 25 ml) and the beakers were shaken for 24 h at room temperature. A blank experiment in the same way with all the reagents except soil was also done. Calculation: Organic C in soil (%) = [(B - T) × f × 0.003×1.3×100] / w. A blank experiment was run simultaneously using all the chemicals except soil. Calculation: N in soil (%) = [(T - B) f 0.014 100ml extract 100] / W volume of extract used. Therefore, C.E.C., in me/l00 g of soil = [X×1000] / 14.

Source of Information: ECOPRINT 15: 7-14, 2008, Ecological Society (ECOS), Nepal, www.ecosnepal.com, ISSN 1024-8668

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

It has been found that bad soil aeration and inadequate moisture are chiefly responsible for unsatisfactory regeneration. Dying back is not an interesting characteristic of Sal, but is caused by bad soil-aeration and drought, the former being due to excessive accumulation of organic matter and moisture and the consequent accumulation of CO₂ and possibly toxic substances.

Knowledge Management: Journal