화태도 양식장 주변해역의 계절별 수질변동 특성

Seasonal characteristics of water quality around aquaculture area in Hwatae island

Hwatae island is located in the southern entrance of Kamak bay,and the aquaculture area around it is a productive sea. The seasonal characteristics of water quality was studied from Feb.,1994 to Oct.,1994 around aquaculture area in Hwatae island.The results are as follows: 1) The characteristics of water quality around aquaculture area showed that autochthonous contribution was higher than that from neighbor sea area as Kamak bay and western-south sea. 2) Chemical oxygen demand(COD) was the lowest mean value of 0.92㎎/ℓ on surface of autumn season in the range of 0.27~1.58,while it was the highest of 1.68㎎/ℓ on bottom of spring season in the range of 0.65~2.80㎎/ℓ.And,which mean that almost area studied is in the eutrophic environment. 3) Nutrients were the lowest value on both layer of spring season except nitrogen on bottom layer of same season. 4) N/P ratios were lower than 16 of Redfield ratio in the almost season with the range of 4.51~11.25 except of bottom layer at spring and summer season. It mean that nitrogen is more limiting constituent than phosphorous in the growth of phytoplankton. 5) Eutrophication indices were high in the almost season expect summer in the range of 0~1.37. If mean that wide area of aquaculutre around Hwatae island is in the condition of eutrophication.And,chemical oxygen demand was considerable parameter to determine eutrophication index in the almost season,while dissolved inorganic nitrogen(DIN) and dissolved inorganic phosphorous(DIP) were the same in the winter and spring,and autumn, respectively.