The Effects of Dissolved Inorganic Nutrients on Eutrophication Situations of Trat Bay, Trat Province
Abstract
The aim of this study was to investigate the effects of dissolved inorganic nutrients on eutrophication situations of Trat Bay during 2 seasons: dry season (March) and rainy season (July). The collected water samples from 15 stations were examined for water quality factors including temperature, salinity, dissolved oxygen, chlorophyll a, ammonia, nitrite, nitrate, silicate and orthophosphate. The results showed that the seasonal factor affecting the alteration of eutrophication situations in Trat Bay was related to the changing of dissolved inorganic groups of nitrogen and phosphorus especially in the rainy season with the high amount of inorganic nitrogen. The high inorganic nitrogen exceeding the eutrophic level caused high amount of the chlorophyll-a making the Trat bay into Hypertrophic situation (higher than eutrophication by 5 times). In addition, the phosphorus concentration was the limiting factor of phytoplankton growth in the rainy season which was correlated by Redfield ratio (N:P) of 45.7. Hence, discharging of phosphorus through various activities of land utilizations resulted in degrading the Trat Bay water qualities by algal bloom. Keywords : dissolved inorganic nutrients ; eutrophication ; Trat BayReferences
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Primary Production in a Simulated Estuarine Gradient. MARINE ECOLOGY PROGRESS SERIES, 124, 271-287 .
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https://helcom.fi/media/publications/BSEP115B-1.pdf.
Hungspreugs, M. (1989). Chemical Oceanography. Bangkok: Chulalongkorn University. (in Thai)
Jayatilake S.M.D.P.A. (2013). Nutrient loading and eutrophication of coastal waters of the South Asian Seas – a
scoping study. Retrieved May 1, 2020, form http://www.sacep.org/pdf/Scoping_study_on_Nutrient_loading_in_SAS_Region.pdf.
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Kan-atireklarp, S., Yuenyong, S., Meesub, B., Buranapratheprat, A. & Meesub, A. (2016). Fluxes of dissolved
429 inorganic nutrients and suspended sediment at the Trat River mouth, Trat Province in dry
430 and wet seasons in 2014. Proceeding of the 5th Marine Science Conference, 221-228. (in Thai)
Karthik R., Robin R.S., Anandavelu I., Purvaja R., Singh G., Mugilarasan M., Jayalakshmi T., Deepak S.l V. &
Ramesh R. (2020). Diatom bloom in the Amba River, west coast of India: Anutrient-enriched tropical river-fed estuary. Regional Studies in Marine Science 35, 2020.
Meteorological Department of Thailand – TMD. (2017). Monthly rainfall data; Trat station. Bangkok, Thailand
Pollution Control Department - PCD. (2006). Marine pollution. Retrieved May 1, 2019, from http://www.
pcd.go.th/info_serv/reg_std_water02.html#s4. (in Thai)
Pollution Control Department - PCD. (2015). Marine pollution. Retrieved May 1, 2019, from http://www.
pcd.go.th/info_serv/water_marine.html. (in Thai)
Smith J.M., Chavez F.P. & Francis C. A. (2014). Ammonium Uptake by Phytoplankton Regulates Nitrification in the
Sunlit Ocean. PLOS ONE. 9(9).
Smith V.H., Tilma G.D. & Nekola J.C. (1999). Eutrophication: impacts of excess nutrient inputs on freshwater,
marine, and terrestrial ecosystems. Environmental Pollution 100 (1999),179-196.
Strickland, J.D.H. & Parson, T.R. (1972). A Practical Handbook of Seawater Analysis. Fishery Research Board of Canada, Ottawa.
Tuntoollavest, M. (2004). Chemicals and waste water (2nd). Bankok: Chulalongkorn University (in Thai).
Tuntoolavest M. and Phornprapa P. (1995). Water quality management and waste water treatment in fish pond
and others aquatic animals. Bangkok: Chulalongkorn University (in Thai)
U.S. Environmental Protection Agency-U.S. EPA. (2001). Nutrient Criteria Technical Guidance Manual Estuarine
and Coastal Marine Waters. Retrieved May 1, 2020, from https://www.epa.gov/sites/production/files/2018-10/documents/nutrient-criteria-manual-estuarine-coastal.pdf.
Wongrat, L. (1999). Phytoplankton. Bangkok: Kasetsart University. (in Thai)
Yuenyong, S., Nimsuwan, N., Buranapratheprat, A., Gunboa, V., Jintasaeranee, P., Thaipichitburapa, P
& Suriyaphan, J. 2019. Water quality of the Bangpakong River during 2016 – 2018.
Burapha Science Journal, 24(1),138-155. (in Thai)
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Published
2021-05-05
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