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第三节  种群和生物群落 PowerPoint PPT Presentation


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在渔业生产上 , 人们 常常被一些问题困扰 : 不捕捞或捕捞过少 , 渔业 资源得不到充分利用 ; 捕捞过多又会导致渔业资源枯竭。那么怎样捕捞才合适呢?在农业生产上农业害虫常常会造成很大的危害。那么害虫的大发生有没有规律呢?怎样 才能控制害虫的数量呢 / 显然,要解决上述问题,仅仅研究个体是不够的,还必须研究生物的种群与群落。. 第三节  种群和生物群落. 一、关于种群的基本概念 地球上任何一种动物或植物都是由许多个体组成,这些个体在地表总是占据着一定的地区。我们把占据着一定环境空间的同一种生物的个体集群叫做种群。

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第三节  种群和生物群落

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