据不完全统计,目前入侵我国的外来物种有400多种,仅海南省就有160多种。这其中有50余种是国际自然保护联盟公布的全球最具威胁的外来生物,每年,仅紫茎泽兰等11种外来入侵生物给中国造成经济损失就高达570多亿元人民币。近年来,外来有害生物入侵更呈现频率加快、危害加大的趋势。 According to incomplete statistics, there are more than 400 alien species currently invaded in our country, and there are over 160 species in Hainan alone. Of these, more than 50 species are the world’s most threatened alien species announced by the International Union for Conservation of Nature. Each year, only 11 alien invasive species such as Eupatorium adenophorum cause up to 57 billion yuan in economic losses to China. In recent years, the invasion of alien pests has become more and more frequent and the harm has been intensified.