環境科学院 植物生態学セミナー   2011-10-11 (Tue) 10:30
(Room: A809 )

Response of riparian vegetation to removal of invasive forb Solidago gigantea and their litter layer

SAITO I. Tatsuya
(Chairperson: Fujinuma )
Invasive forbs often invade native grasslands, impact the native plants, and predominate the grasslands. To explore the methods for recovering the native plants into exotic forbland, we investigated the response of vegetation to the removal of aboveground shoots and/or litter of Solidago gigantea in Hokkaido, northern Japan. The four treatments were removal of aboveground shoots of S. gigantea (A), removal of the litter (L), removal of both the aboveground shoots and litter (AL), and control (C). Vegetation cover and S. gigantea cover decreased in A and AL, while those increased in L and C. Native plant cover increased in A and AL, but did not change in L and C. The increases in native cover in AR and ALR were associated with increases in Phalaris arundinacea. The seedling emergences of P. arundinacea were promoted by AL. In a greenhouse, S. gigantea litter inhibited the seed germination of P. arundinacea. AL also increased the abundances of other exotics, particularly Solidago altissima. The removal of aboveground shoots and litter of S. gigantea is effective for promoting the recovery and emergence of native riparian vegetation. However, this method also promotes the recovery of other exotics.
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