Characteristic Analysis And Riskassessment On Alien Invasive Plants In Northeast China

Based on classic taxonomy and the investigation of literatures and specimens,plant invaders and emerging plant invaders in Northeast China were collected, riskassessment system as well as risk indicator network of alien plant invaders wasestablished, they provide theoretic basis and basic measures of prevention foreliminating alien plant invaders.The main conclusions are as follows:(1) The list of alien invasive plants in northeast China has been compiled. The listincluded92species in22families of alien invasive plants. Compositae and Gramineaeare the dominant families. There are84species of alien invasive plants in LiaoningProvice,59species in Jilin Provice and57species in Heilongjiang Provice. The mainkinds of afferent pathway are intentional and unintentional. The largest number ofalien invasive plants is come from Europe and North America. Herbage of annuals andbiennials has most species.(2) By using the method of risk assessment index system, a integrated riskassessment system with multiple-level and multiple-indicator was established aims tothe alien invasive plants in Northeast China. By using the principle of analytichierarchy process, the weight of the index system has been determined. The total scoreof the index system is100points, each indicator given different points according to itsweight ratio.(3) Based on the risk assessment score, the risk can be divided into three levels:low, average, high and very high. It proposed appropriate management strategies fordifferent risk level. There are16species in low risk level,41species in average risklevel,23species in high risk level and12species in very high risk level.(4) Invasion risk warning network of Liaoning Province was established, as wellas network database, including many dabases for alien plants of Liaoning Provincenamed directory database, color image database, academic trends database, popularscience garden and so on.