Effectiveness of Vegetation Ma Gement of the Herbaceous Community Invaded by Coreopsis Lanceolata in Restoring the Vegetation of Gravelly Beds of the Kiso River

27 Mar Effectiveness of Vegetation Ma Gement of the Herbaceous Community Invaded by Coreopsis Lanceolata in Restoring the Vegetation of Gravelly Beds of the Kiso River

View Original

Abstract

English Abstract

We conducted a survey on vegetation change and performed a germi tion test for the topsoil seed bank after vegetation ma gement of the herbaceous community domi ted by the invasive alien species Coreopsis lanceolata on the riverbed of the Kiso River. We observed that although a large number of C. lanceolata seedlings were established, few flowering shoots emerged in the year following vegetation ma gement (removal). The extended summed domi nce ratio of C. lanceolata decreased, while that of Potentilla chinensis and Galium verum-domestic species growing on the gravelly riverbed-increased. However, the number of alien species of annual and biennial plants markedly increased after the removal. The germi tion test showed that this increase was caused by germi tion and establishment from the seed bank in the disturbed area after the removal. The test also showed that the seed supply of Artemisia capillaris and Dianthus superbus var. longicalycinus-domestic species growing on the gravelly riverbed and, in small numbers, in the surveyed and surrounding areas-was low. In this study, the removal proved effective in controlling the flowering of C. lanceolata; however, the problem of increase in the number of alien species of annual and biennial plants remains to be resolved.