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水资源的合理利用 PowerPoint PPT Presentation


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水资源的合理利用. 一、水资源的概念. 广义:地球上水圈内的水量总体 狭义:目前技术条件下,可供人类利用的那一部分淡水资源 (包括河流水、淡水湖泊水、浅层地下水). 地球号称是“水的星球”,但人类正面临着严重的水危机。近几年,非洲大旱,灾民遍野;水资源丰富的俄罗斯和加拿大,有些地区也受到缺水的威胁;美国、日本以及东欧许多国这家都感到水源不足。水的星球何以缺水。. 思考:. 1 、为什么地球上缺水? 2 、为什么世界上的水资源分布不均? (可从各大洲、各国家以及我国水资源的分布为例,进行说明). 二、世界水资源分布. 1 、影响水资源分布的因素 降水量的空间分布

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水资源的合理利用

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