Chiang Mai Journal of Science

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A study of the effect of nitrogen and phosphorus on the dynamics of blue-green algae in surface water at three stations in the Mae Ngat Somboonchol Reservoir was carried out from January to December 2001. Blue-green algae were composed of 2 orders, 3 families, 12 genera and 21 species, of which the dominant species were Lyngbya limnetica Lemmerman and Raphidiopsis curvata Fritsch & Rich. Ammonia nitrogen, nitrite nitrogen, orthophosphate phosphorus and total phosphorus levels all affected the dynamics of bluegreen algal community. In tems of water quality, the Mae Ngat Somboonchol Reservoir currently contains low levels of nutrients (Oligotrophic status) and can be classified as the second level category according to the National Environment Committee Announcement (No. 8, B.E 2537). Thus, the water can be used for many purposes, but for drinking purpose it must be treated.

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