[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①维护地球上的碳氧平衡 ②是世界医药之源③提供大量的优质硬木 ④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．养题目和参考答案——青夏教育精英家教网—

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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

①维护地球上的碳氧平衡 ②是世界医药之源

③提供大量的优质硬木 ④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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