Agricultural Research Management Information System

Home
Research Summary
Search
About Us
- ARMIS
- Brochure
Contact Us
Report
User Request
Data Input
Help
- Operation Manual
  - PDF
  - Video
- Program Area & Commodity
We have reached 37600 number of research entries at this moment.

- Logout

Research Detail

Home
Research
Detail

Temporal and Spatial Variation of Dissolved Nutrients in the Lower Meghna River Estuary, Bangladesh

M. M. Uddin
Institute of Marine Sciences and Fisheries, University of Chittagong, Chittagong 433, Bangladesh

S.R. Chowdhury
Institute of Marine Sciences and Fisheries, University of Chittagong, Chittagong 4331,Bangladesh

M. Zafa
Institute of Marine Sciences and Fisheries, University of Chittagong, Chittagong 433, Bangladesh

M.U. Nessa*
Environmental Science Discipline, Khulna University, Khulna 9208, Bangladesh

Abstract/ Executive Summary:

An investigation on variation (temporal and spatial) in the contents of some selected inorganic nutrients (nitrite, nitrate, ammonium, phosphate and silicate) was carried out in the lower Meghna river estuary, Bangladesh during September 2001 to May 2002 (covering an annual cycle). All the nutrients studied showed irregular pattern of temporal and spatial fluctuations where most of the nutrients showed peak values during premonsoon and trough values during monsoon. A decreasing trend in nutrient concentrations was observed towards the sea in all the seasons.

Keywords: Temporal, Spatial, Variation, Nutrient, Meghna estuary

Location: The lower Meghna river estuary, Bangladesh

Start Date: 00-09-2001

End Date: 00-05-2002

Program Area: Chemical Analysis

Commodity: Nutrient solution

Objectives:

This paper reports the status of temporal and spatial variations of dissolved nutrients in the waters of the lower Meghna river estuary.

Methodology:

Five stations (Station-1 Chandpur, Station-2 Barisal, Station-3 Bhola, Station-4 Hatyia, and Station-5 Sandwip) ranging from an inland location at Chandpur to off shore coastal location at Sandwip Island were selected for water sampling covering a length of about 275 km. The average depth of the estuary was 5-6 m. Water samples were drawn from surface and sub-surface water layers (about 3 meters depth) at each sampling location during pre-monsoon, monsoon and post-monsoon seasons maintaining a 4 months interval (September-January-May) between the seasons. After collection, samples were immediately filtered through 4.7 cm Whatman GF/C filter using electrical suction apparatus; and transported to the laboratory of the Institute of Marine Sciences and Fisheries, Chittagong University. Frozen samples were brought to the room temperature and analyzed using standard operating procedures. Nitrate, nitrite and silicate were determined following Strickland and Parson (1972). Ammonium-nitrogen was estimated with modified Phenol-hypochlorite method (Jin-Eong et al., 1985). A modified single solution method of Murphy and Riley (1961) was followed for the determination of total inorganic phosphate.

Source of Information: Khulna University Studies, 8(1): 117-124, 2007

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

As for influx of higher volume of water through the estuary during the monsoon inorganic nutrients were more diluted and consequently showed lower concentrations than the premonsoon followed by the postmonsoon periods. Higher values during the premonsoon were due to higher evaporation and lower drainage of freshwater. The results of the present investigation suggest the need for a long-period monitoring for better understanding of nutrient dynamics in the Meghna river estuary. It is expected that the output of this investigation will be very useful to future workers for drawing a tangible conclusion on estuarine nutrient dynamics.

Knowledge Management: Journal