Disaster resistant threshold to Anoplophora glabripennis by reasonable allocation of varied tree species

In order to figure out the feasibility of resisting Anoplophora glabripennis by different tree species allocation,this paper brought forward the concept of disaster-resistant threshold for the first time.Thirty-five sample sites with different bait tree species and diverse tree ages were chosen in Ningxia Irrigating Area diverted water from the Yellow River for investigation,and 15 average standard trees were selected for stem analysis to establish population model and timber loss model.Disaster-resistant threshold model was confirmed by combining with integrated benefit evaluation results and current lumber purchase standards.Results show that rational proportion of bait trees should be 7.093%-25%,and proper disaster-resistant threshold can be computed according to different requirements for tree species,which reveals the dynamics and flexibility of disaster-resistant threshold.