九州大学大学院農学研究院環境農学部門農業環境科学講座農業生産生態学分野
Laboratory of Agricultural Ecology, Division of Agronomy and Environmental Sciences, Department of Agroenvironmental Sciences, Faculty of Agriculture, Kyushu University
Lotus plants grow in the moat of Maizuru Park, Fukuoka City, but the growing area is decreasing year by year in these several years. It is estimated that the causes of the growing area decrease are feeding damage by tortoises and/or the leaf submersion caused by torrential rain from rainy season to summer. In this study, effect of leaf submersion on the subsequent growth of lotus was investigated. One and two months old lotus plants were submerged for 6, 12, 24 and 48 hours in the water in June and August 2012. After the submersion, they were cultivated for four weeks and leaf growth was investigated in every week. Number of leaves died and disappeared water-shedding property increased by the submersion for more than 24 hours. The more the temperature during submersion, the more number of leaves died. The leaves proliferated after submersion showed well-growth when the plants were submerged within 48 hours. From these results, it was thought that the submersion of the leaves was not a direct cause of the decline of the lotus plants in the moat of Maizuru Park, Fukuoka City.
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