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【题目】热带雨林是地球上功能最强大的生态系统,也是生产力最高的生物群落,但同时也是一个非常脆弱的生态系统。据此回答下列问题。

【1】热带雨林生态功能强大的表现是

维护地球上的碳氧平衡 是世界医药之源

提供大量的优质硬木 维持全球的水循环和水平衡

A.①② B.②③ C.③④ D.①④

【2】热带雨林的脆弱性表现在

A.生物残体分解快 B.植物生长速度快

C.养分几乎全部储存在地上的植物体内 D.群落以高大的乔木为主

【3】为促进世界森林的可持续经营、保护和开发,我们应该

A.封山育林,禁止对森林的砍伐 B. 注重开发,提高林业经济效益

C.禁止各种木材的流通和买卖 D. 采育结合,综合开发利用

【答案】

【1】D

【2】C

【3】D

【解析】

试题分析:

【1】热带雨林被成为地球之肺,排放出超过三分之一的地球上的氧气;其蒸发量巨大,在世界水循环中处于重要地位,D正确。其对世界医药、木材方面的贡献不是生态方面的最大贡献,错。

【2】雨林地区有机质分解和养分再循环旺盛,土壤自身很少积累和补充养分,使雨林生长所需要的养分几乎全部储存在地上的植物体内,是雨林生态系统脆弱性的主要表现。C正确。

【3】对待森林既要开发,又要保护,保护前提下的合理利用才是良策,D正确。全面禁止开发和只重开发,都是错的,因此,ABC错。

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