Disaster resistant threshold to Anoplophora glabripennis by reasonable allocation of varied tree species
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摘要: 为了明确多树种合理配置抗御天牛灾害措施的可行性,首次提出了控灾阈值的概念.在宁夏引黄灌区选择对不同诱饵树配置、不同树龄的样地35块进行调查,并对15株平均标准木进行树干解析,建立虫口模型及其材积损失模型,结合综合效益评价结果并根据目前市场木材收购标准,确定了光肩星天牛控灾阈值模型.结果表明:诱饵树比例应控制在[7.093%,25%]的区间内,同时可以根据对不同树种的不同要求计算出适宜的控灾阈值,体现了控灾阈值的动态性、灵活性.Abstract: 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.
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