population fluctuation

• 种群波动,种群变动

population fluctuation的用法和样例：

例句

1. Studies on the life table showed that key influencing factors on the dynamics of natural population of Rhopalosiphum padi Linnaeus were weather and natural enemies.
   试验表明，影响禾谷缢管蚜自然种群变动的主要因素是气候和天敌。