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Chemical Properties of the Sundarbans Mangrove Forest Soil

A. K. M. Faruk-E- Azam
Department of Agricultural Chemistry,Patuakhali Science & Tecnilogy University, Patuakhali.

M. W. Zaman
Department of Agricultural Chemistry, BAU, Mymensingh.

M. A. K. Chowdhury
Department of Agricultural Chemistry, BAU, Mymensingh.

Abstract/ Executive Summary:

An investigation was conducted to determine present status of Chemical properties of surface soil of the sundarbans mangrove forest. Soil samples were collected during summer and winter seasons of 2007 to 08 from different sites of Sathira, Bagerhat and Khulna regions. The P^H , electric conductivity (EC), organic matter (OM) and nitrogen contents of the soil samples collected from different locations ranged 7.0 -8.0, 5.220-112.40 dS m¹, 1.123-72% and .06-.22% during summer, and 7.2-8.1, 5.220-112.04 dS m¹,.94-3.53% and .05-.20% during winter respectively. The ranges of P,S, B, Ca, Mg, Na, Zn, Cu, Mn, Cd, Pb were 6.22-18.66, 98.00-925.50, .74-4.80, 820.0-3600, 608.0-1945.6, 152.0-1053, 63.70-194.5, .24-1.25, 39.30-185.67, 17.26-29.76, 4.65-10.05, .01-.04, 1.08-3.59 mg Kg¹ respectively during summer. The contents of the elements were 5.54-19.81, 167.5-678.0, 1.03-4.58, 940.0-4600.0, 851.2-1580.0, 198.9-858.0, 40.26-162.51, 1.05-5.68, 45.40-168-40, 23.94-69.16, 5.42-8.42, .0004-.011, .0003-.0009 mg Kg¹respectively winter. The chemical properties of the soils were comparatively higher in winter than summer and varied with locations of soil collection.

Keywords: Forest Chemistry, Forest. Soil, Mangrove, Sundarbans, Mangrove ecoshystem

Location: Sathira, Bagerhat and Khulna regions.

Start Date: 01-03-2007

End Date: 30-11-2008

Program Area: Crop-Soil-Water Management

Commodity:

Objectives:

To determine present status of chemical properties and contents of different elements in the soils of Sundarbans mangrove forest in Bangladesh.

Methodology:

Soil samples were collected at a depth of 0-15 cm from 11 selected locations of three regions of the Sundarbans during winter and summer seasons starting from March 2007 to November 2008. The soil sampling sites were Kalagachhia camp, Kobadok camp, Kadomtola camp, Chunkuri camp, Koikhali (North) and Koikhali (South) of Satkhira region; Jongra camp, Karamjol camp of Bagerhat region, Kalibari, Moheswaripur and Shibsa camp Kalibari, Moheswaripur and Shibari camp of Khulna region. The samples were air-dried, ground and sieved to pass through a 2 mm sieve and then mixed thoroughly to make a composite sample for each of 11 locations. Dry roots, grasses and other debris were removed from the soils. About 500 g soil sample of each locations was poured into a polythene bag was brought to the laboratory of chemical analysis.

Soil P^H was measured with a glass electrode PH meter, the soil-water ratio being maintained at 1:2.5. Organic carbon content was determined following wet oxidation method. The organic matter content was calculated by multiplying the percent organic carbon by the constant 1.724. Total N content of soil was estimated following the micro-Kjeldahl method. Available P constant was calorimetrically. Exchangeable K and Na were determined by FES method. Available Zn, Fe, Mn, B, Cu, Pb, Cd in collected in soil samples were determined following DTPA extraction method by AAS.

The statistical analysis of the data on chemical analyses of soil samples were performed following the standard method as described by Gomez and Gomez.

Source of Information: Bangladesh Journal od Agriculture, vol. 36(1)2011,(pa no. 131-140) ISSN 0253-5408, Bangladesh Agricultural Research Council

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

For the finding the present investigation, it may concluded that in Sundarbans soils the P^H and EC increases at higher level in winter season. During winter all the surface soils were detected as very strongly saline (EC>16 dS m¹). Saline water adds salts to surface and subsurface layer of soil. The P, B, Mg, K, Cd, Pb increase in summer than winter. The increase of Cd and Pb in summer was remarkable. The EC, OM, N,S,Ca, Na, Zn, Fe, Mn, Cu increase in winter than summer. Ca, Mg, Na in soil amounting by 1.5 times higher in summer and around double in winter. Ca, Mg, Na in soil is influenced by sample collection season. Continuous deposition of water born sediments adjacent to long mangrove forest regions are the major reservoirs to toxic heavy metals.

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