Relationship between riverside vegetation and habitat condition in the Chikuma and Azusa Rivers, Nagano Prefecture, Japan

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  • 千曲川、梓川の河畔植生とその環境条件
  • チクマガワ アズサガワ ノ カハンショクセイ ト ソノ カンキョウ ジョウケン

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Abstract

We clarified the relationship between species composition and vegetation environment for the rocky Azusa River, in the city of Matsumoto, central Japan, and the sandy Chikuma River. Two endangered species, Ixeris tamagawaensis and Orostachys japonicus, occurred in the rocky riverside habitat of the Azusa River. Several species occurred in the sandy riverside habitat of the Chikuma River, including Phalaris arundinacea and Miscanthus sacchariflorus, which usually grow in wet lowlands, and Cyperus microiria and Portulaca oleracea, which are distributed in crop fields. The dominance of species at all sites was analyzed using the ordination technique of detrended correspondence analysis. The first axis was significantly positively correlated with a short distance from the river, low relative height above the water level, small particle diameter of sand, an increase in therophytes, and a decrease in trees and alien plants. Riverside vegetation was influenced by river flow disturbance, as indicated by the distance from water and relative height above water level. Furthermore, the particle diameters of sand and rocks affected the soil water content at the sites. Consequently, various site factors resulted in differences in the species composition of riverside vegetation.

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