Using water samples from Nagara River and its tributaries in the central Japan Gifu Prefecture,the transformation characteristics of nitrogen by planktonic microbe were studied under aerobic and anaerobic conditions.

• 以日本岐阜县境内的长良川及其支流为对象,研究了浮游微生物作用下河流水系在好氧、厌氧条件下的氮、磷变化特性。