根据两种田鼠种群波动周期性、波动峰值出现的时间以及特定年份峰值的高度等特征，证明两物种波动均具有不稳定性。
Population fluctuations of both species were erratic in respect to annual occurrence, the time of the peak density of fluctuations within years, and the hight of peak the density a given year.
在环境变化较大时，白色噪音水平(变动系数)增加至35%，稳定型种群变为不稳定型。
When the environment variations are high, the white noise level (coefficient of variation) increases to 35%, the stable fish population becomes spasmodic.
结果表明，沟谷热带雨林各层次中的乔木种群组成是不稳定的，常常随时间而改变。
The result shows that the composition of tree populations is unstable and changes with time.
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