オオキンケイギク優占群落の選択的抜き取り管理の時期による礫河原植生復元効果の違い

概要

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We aimed to investigate the seasonal effects of removing invasive plants on the herbaceous community invaded by Coreopsis lanceolata, especially in terms of the restoration of the native vegetation in gravelly riverbeds. Invasive plants were removed either in June (once) or in June and October (twice). This was performed for 1, 2, or 4 years. After the 4-year experiment, the number of existing seed banks, emerging seedlings, flowering individuals, and total shoots of C. lanceolata decreased in the plots after removal both in June and in June and October. Therefore, the effect on controlling C. lanceolata did not differ among the different seasons of removal. On the other hand, removal in June resulted in increased dominance of native perennial herbs in the plots. However, a significant increase in the dominance of alien annual and biennial herbs was also observed, and recovery of dominance of native perennial herbs was suppressed in the plots after removal in June and October. In conclusion, this study shows that the native vegetation in gravelly riverbeds was more effectively restored on removal in June than that in June and October.