背景:云杉蚜虫是一种会吃森林树叶的虫子,同时也会被鸟类等动物捕食。<ref name="Strogatz1994" /><ref name="Ludwig1978">Ludwig, D., Jones, D. D., Holling, C. S. (1978) Qualitative Analysis of Insect Outbreak Systems: The Spruce Budworm and Forest.</ref>
==模型方程==
==模型方程==
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<math display="block">
<math display="block">
\begin{cases} \dot x = \mu - x^2 \\ \dot y = -y \end{cases}
\begin{cases} \dot x = \mu - x^2 \\ \dot y = -y \end{cases}