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

作　　者：Chika Egawa Takeshi Osawa Tomoko Nishida Yasuto Furukawa 

机构地区：[1]Institute for Agro-Environmental Sciences,National Agriculture and Food Research Organization,3-1-3 Kannondai,Tsukuba,Ibaraki 305-8604,Japan [2]Faculty of Urban Environmental Sciences,Tokyo Metropolitan University,1-1 Minami-Osawa,Hachioji,Tokyo 192-0397,Japan [3]Headquarters,National Agriculture and Food Research Organization,3-1-1 Kannondai,Tsukuba,Ibaraki 305-4517,Japan [4]Rakuno Gakuen University,582 Bunkyodai-Midorimachi,Ebetsu,Hokkaido 069-8501,Japan

出　　处：《Journal of Plant Ecology》2019年第4期673-681,共9页植物生态学报（英文版）

基　　金：This work was supported by the first author’s institution,National Agriculture and Food Research Organization[1E16N104L1G00].

摘　　要：Aims The invasion success of alien plants is strongly affected by both biological and human-associated factors.Evaluation 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 priority.Here,we quantified the relative importance of species biological traits and association with a human activity,i.e.agriculture,in explaining the invasion success of alien plants across the entire region and in protected areas in Hokkaido,Japan.Methods 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 units.For 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 cul-tivation.The importance of biological traits and human-associated factors in explaining the distribution extent was determined using an information-theoretic approach.Important 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 period.In contrast,when focusing on pro-tected areas,human association was more important than bio-logical traits,as indicated by the greatest importance of cultivation frequency and much lower values for most bi

关 键 词：agricultural use biological invasion DISTRIBUTION nature reserve pasture plants 

分 类 号：R73[医药卫生—肿瘤]