Abstract: Based on the demands for preventing, controlling, and managing the invasion of alien species in Inner Mongolia, an investigation of species composition and invasion status of alien plant species in Inner Mongolia was conducted. There are a total of 55 alien plants belonging to 17 families. We established a risk assessment indicator system that could be adapted to the characteristics of ecological, economic and social development of Inner Mongolia. Using this indicator system, the invasion risks of 53 alien plant species were evaluated and the levels of the invasion risks were assessed. For each risk level, the corresponding risk management strategies were presented. Our results provide a favorable guarantee for prevention and control of alien plants and consequently the ecological security in Inner Mongolia.

Key words: amino acid, bioavailability, plantsoilmicroorganism.