용담호에서 환경요인과 식물플랑크톤의 시공간적 변동

초록

Environmental gradients and phytoplankton community were studied on a monthly basis, at 3 stations of Lake Yongdam, from April 2002 March 2004. During July to August, thermocline formed at the depth of about 10 m, but it was lowerd depth, in between 25~30 m in October. Monthly variations of the epilimnetic (0~5 m) TP concentrations at station 1, 2 and 3 were in the range of 5.1~36.1 mg P∙m-3, 6.1~77.7 mg P∙m-3 and 6.7~47.7 mg P∙m-3 respectively; with higher concentrations at the upstream areas showing . Monthly average of the epilimnetic (0~5 m) TN concentration at Station 1 was in the range of 0.88~1.73 mg N∙L-1, and Station 3 was in the range of 0.94~2.77 mg N∙L-1, which is higher if compared with the values of station 1. Transparency was in the range of 0.8~6.7 m, with lower values at upstream areas and higher at the downstream area. As for phytoplankton, during the winter season, diatoms had high appearance rate; during the spring season, Cyclotella comta, Aulacoseira ambigua f. spiralis, A. granulata and similar diatoms; during spring and summer Ankistrodesmus spiralis, Chodatella subsala, Crucigenia irregularis, Coelastrum cambricum, Scenedesmus ecornis v. ecornis.

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