摘要
采用分期调查病情,引入模糊集论中模糊等价关系的模糊聚类分析方法,将发病数量(强度)、空间和时间动态的相互关系联系起来,作为统一体,研究了小黑杨灰斑病的流行动态,同时结合孢子捕捉观测,将灰斑病在一个生长期内的流行动态划分为J_1,J_2,J_3,J_4四个阶段。在此基础上提出了灰斑病的发展进程为始期、始盛期、盛期、未期,其时间系列大致分别为:6月上旬、6月中旬、7月上旬、8月上旬。
Based on the method of Fuzzy theory and Cluster analysis,the epidemic dynamics of grey leaf-spot of Populus simonii * nigra has been presented by the disease condition being periodically investigated and integrated it with the dynamics of the ratio of the disease occurring space states and time. Meanwhile,the proliferation and spreading of spores were observed.So the epidemic dynamics could be divided into four periods that are the period of the beginning (about the first ten days of June),the beginning prevailing (about the middle of June),the prevailing(about the first ten days of July)and the end (about the first ten days of August).
出处
《东北林业大学学报》
CAS
CSCD
北大核心
1991年第5期8-16,共9页
Journal of Northeast Forestry University
关键词
杨树
小黑杨
灰斑病
流行动态
Populus spp.
Coryneum populinum
Epidemic dynamics
