摘要
Almost everyone now seems to have a view about alien plant introductions and their significance and there is an ever increasing body of information,both in the scien-tific and popular press,about the dangers of allowing the uncontrolled spread of alien species.Virtually all possible impacts of plant invasions have been reported,including alterations in biogeochemical cycling,disruption of food webs,alterations in plant-plant,plant-insect and plant-microbe interactions and reductions in biodiversity,leading to the proposal that this is resulting in the creation of novel or emerging ecosystems that have no historical analogue(Hobbs et al.2009).
