松墨天牛成虫林间种群数量混沌特性的识别

Identification of Chaos Characteristic of Population Quantity of Adult Monochamus alternatus in Forest

[目的]研究松墨天牛成虫2006～2010年林间种群数量序列的混沌特性。[方法]分别采用功率谱分析法、关联维数和嵌入维数、最大Lyapunov指数法。[结果]不同的混沌判定方法结果均显示松墨天牛林间种群数量序列具有混沌特征,属于混沌时间序列;当延迟时间τ=5、嵌入维数m=15时,对应的相空间中关联维数D=2.807 6,最大Lyapunov指数λ1=0.561 3。[结论]该研究结果可为松墨天牛的监测和预报工作提供参考。

[Objective]The paper was to study the chaos characteristic of population quantity sequence of adult Monochamus alternatus in forest.[Method]Power spectral analysis method,correlation dimensionality and embedding dimensionality,and the largest Lyapunov index method were adopted in the paper,respectively.[Result]The results from different chaos determination methods all showed that the population quantity sequence of adult M.alternatus among forest had chaos characteristic,belonging to chaos time sequence;when the delay time τ=5 and embedding dimensionality m=15,the correlation dimensionality in the corresponding phase space D=2.807 6,and the largest Lyapunov index λ1=0.561 3.[Conclusion]The result provided the reference for monitoring and forecast of M.alternatus.