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.
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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