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Relative importance of biological and human-associated factors for alien plant invasions in Hokkaido, Japan

Journal of Plant Ecology 2019年第4期12卷 673-681页

作者： chika egawa Takeshi Osawa Tomoko Nishida Yasuto Furukawa Institute for Agro-Environmental Sciences National Agriculture and Food Research Organization3-1-3 KannondaiTsukubaIbaraki 305-8604Japan Faculty of Urban Environmental Sciences Tokyo Metropolitan University1-1 Minami-OsawaHachiojiTokyo 192-0397Japan Headquarters National Agriculture and Food Research Organization3-1-1 KannondaiTsukubaIbaraki 305-4517Japan Rakuno Gakuen University 582 Bunkyodai-MidorimachiEbetsuHokkaido 069-8501Japan

Aims The invasion success of alien plants is strongly affected by both biological and human-associated *** of the rela-tive contribution of each factor is important not only for the further understanding of invasion processes but also for the better manage-ment of invasion risk,particularly in protected areas of high con-servation ***,we quantified the relative importance of species biological traits and association with a human activity,***,in explaining the invasion success of alien plants across the entire region and in protected areas in Hokkaido,*** As a quantitative measure of invasion success,the distribution ex-tent of naturalized populations across the entire prefecture and in protected areas was calculated for 63 alien species with equal residence time based on species occurrence records at a spatial resolution of 5-km mesh grid *** each species,we identi-fied seven biological traits(seed mass,dispersal mode,maximum plant height,capability of vegetative reproduction,flowering start time and period and life span)and two human-associated factors(introduction purpose and cultivation frequency for agricultural use).Cultivation frequency was determined based on the frequency of seed-sowing in pastures:(1)not sown,(2)accidentally sown as a seed contaminant and(3)intentionally sown for commercial *** importance of biological traits and human-associated factors in explaining the distribution extent was determined using an information-theoretic *** Findings In explaining the distribution extent across the entire prefecture,species biological traits and human-associated factors showed comparable importance;cultivation frequency exhibited the high-est importance value closely followed by seed mass,maximum height and flowering *** contrast,when focusing on pro-tected areas,human association was more important than bio-logical traits,as indicated by the greatest importance of cultiva

关键词： agricultural use biological invasion distribution nature reserve pasture plants

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