下图表示数量处于动态平衡状态的某种群在受到某些因素影响后种群

下图表示数量处于动态平衡状态的某种群在受到某些因素影响后种群数量发生变化的曲线图。下列相关叙述中不正确的是(    )

A.若图①所示为草原生态系统中某种群,则a点后的变化可能原因是过度放牧

B.若图②所示为某发酵罐中菌种数量,则b点后的变化原因可能是增加营养供应

C.图②c点后发生的变化表明生态系统的自动调节能力有一定限度

D.若图④所示为海洋中某鱼的种群,d点时进行捕捞的最大捕捞量应大于K/2

 

答案

D

当改善种群生活环境时,环境的容纳量会增大即K值变大;当外界干扰超过生态系统自动调节能力时,生态系统被破坏,种群数量急剧下降;当种群数量维持K/2时,种群的增长率最大。

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