長野県上伊那地域における水路網ネットワーク単位での水生植物の分布と立地環境条件との関係

概要

論文の詳細を見る
Recently, the loss of diversity of aquatic plants has become an important issue. The purpose of this study was to determine the relationship between aquatic plant distributions and environmental conditions in canal networks in order to develop appropriate conservation species. Six types of water areas (river, reservoir, paddy field, irrigation canal, drainage, and fish-breeding pond) in canal network in Ina district, Nagano prefecture, central Japan were selected as the study sites. The dominance of the aquatic plants in these sites was surveyed using provisional quadrates. The flora of aquatic plants in these study sites were surveyed in the summer and the fall seasons of 2009. The environmental conditions were measured and recorded as follows; water quality, agricultural and dredging managements and so on. The number of appearance species was 51 in the summer. On the other hand in the fall, the one was 26. It was recognized that the species richness of the paddy field plots were highest with the exception of mid-summer drainage ones. There were a large number of appearance species in the irrigation canal plots with periodic artificial disturbance. As a result, it seems that the maintenance such as paddy field farming with periodic artificial disturbance can be increased the species richness of aquatic plants.