Host: Center for Environmental Information Science
Pages 119-124
A relationship between stream-stage variations and growing positions of Persicaria capitata, an alien species recently invades rivers in Japan, was examined. A river revetment with P. capitata was photographed on the length of 59.6 meters in Nishiyoke River of the Yamato River system, in Sakai, Osaka on the summer of 2015. And vertical positions of it were measured at lines set every a meter. At the result of examining relationships of the positions and stream-stage variations for 9 years, it was found out the growth was suppressed strongly under submerging over 260 days and become difficult over 300 days in a total of a year, and it was suppressed continual strongly under submerging over 140 days and become difficult over 200 days in a year. And it was suggested the positions were affected by something else in addition to submerging, for example soil drying and season of P.capitata’s seed dispersal.
