海産プランクトンの増殖におよぼすし尿の効果

概要

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Enhancement of algal growth and accompanied organisms after fertilization with night soil digested by facultatively anaerobic process was estimated through indoor and outdoor experiments. Seawater enriched with various amounts of digested night soil was inoculated with Nitzschia closterium or mixed population of natural phytoplankton and incubated at 20°C under 6, 000 1x illumination for 12 hours per day during 4 weeks. Growth of Nitzschia and natural plankton especially green flagellates were much stimulated by adding 5-20 ml/l and 5 ml/l of night soil, respectively. A floating box made of PVC filled with 100l of natural seawater enriched with 1 liter of digested night soil was placed on the water surface of Uranouchi-Bay, Pacific coast of Kochi prefecture, Japan, for 4 weeks during January to February, 1978. Water temperature was about 13°C. Population of plankton and soluble trophic elements were surveyed every week. Planktonic diatoms, which dominated in the original seawater, were overcome by such unicellular green algae as Platymonas and Chlamydomonas. Some filamentous and coccoid blue-greens and ciliates also propagated. Content of chlorophyll a increased from 2.5 to 43μg/l, and soluble PO4-P decreased from 10 to 0.5μg/l, after 4 keews.
日本水産學會の論文