外来有害生物入侵正在威胁中国林业发展和生态环境。几乎在中国所有类型的生态系统中都出现了外来有害生物的侵害现象,每年受害森林面积达2000多万亩。据测算,中国林业每年因几种主要外来有害生物入侵造成的经济、社会和生态损失达560亿元。所谓外来有害生物是指由于人为或自然因素被引入新生态环境并对新生态系统、物 Invasion of alien pests is threatening China’s forestry development and ecological environment. Extermination of exotic pests has taken place in almost all types of ecosystems in China, affecting more than 20 million mu of forest each year. It is estimated that the economic, social and ecological losses caused by several major invasive pests in China’s forestry each year amount to 56 billion yuan. The so-called alien pest is due to human or natural factors were introduced into the new ecological environment and the new ecosystem,