| In general, the river embankment is covered with the vegetation such as grass in order to protect the slopes. In a cooler region such as Hokkaido, alien species such as Kentucky Bluegrass have been used to protect the embankment. The purpose of this research is to clarify appropriate native grass species in the cooler region and how to plant them.
The investigation using native species was conducted on the left embankment along Chitose River. As native species, seven species were chosen, and the planting method was used humic acid spraying and vegetation sheets. The survey data collected for 3 years revealed that 5 native species (Yoshi (Phragmites australis), Ogi (Miscanthus sacchari florus), Biroudosuge (Carex fedia Nees var. miyabei (Franch.) T. Koyama), Yamaawa (Calanagrostis epigeios), and Ooyomogi (Arlemisia vulgaris)) were available in cooler region. It was also revealed that vegetation sheet was effective as planting method.
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