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댐 저수지에서 alkaline phosphatase 활성의 수직변화와 미생물 요인들과의 상관관계
( Hirotani Hiroshi ),( Ayumi Nakagawa ),( Hisanori Kagawa ) 한국하천호수학회 2004 생태와 환경 Vol.37 No.4
The alkaline phosphatase activity (APA) of two dam reservoirs and inflowing streams were measured monthly in 2000. During summer months in 2001, the vertical profiles of APA and related parameters were also examined in one of the reservoirs. The APA was relatively high during the summer season in the epilimnion while it was almost invariable in the hypolimnion. A small increase in APA was observed at just above the bottom. The APA fluctuation was independent of the concentration of soluble reactive phosphorus. It was assumed that APA is not indicative of the phosphorus availability status. An examination of size-fractionated samples suggested that APA in reservoirs was attached to particles larger than 0.4 ㎛, whereas in streams it existed in a dissolved form. There was a positive significant correlation between chlorophyll α concentration and APA in the photic zone. In the aphotic zone, APA correlated positively with the colony count of heterotrophic bacteria, but not with microscopic total bacterial counts.