水域における窒素代謝に関する微生物学的研究-5-金魚池における窒素代謝について〔英文〕

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By the use of the 15N tracer technique, the nitrogen metabolism was studied in the model system of a goldfish culturing pond. A large part of 15N labeled ammonium nitrogen metabolized was incorporated into the organisms of the primary trophic level in the early stages of the experiment, then transformed into dissolved organic nitrogen either in the excretion of the organisms or in the decomposition process of their dead bodies. On the other side, only a small amount of this ammonium nitrogen was incorporated into the organisms of the higher trophic level, zooplankton and fish. Ammonium nitrogen in the water was oxidized to nitrate nitrogen via nitrites; a con-siderable part of this nitrite nitrogen was transformed to gaseous nitrogen in the process of bacterial denitrification. A large amount of ammonium nitrogen was also transfered into the bottom mud through various metabolic pathways.
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