Many wetlands around the world are being lost or are under threat. In many cases, losses are caused by direct development activities such as irrigation systems, conversion to agricultural land, reclamation for urban expansion, or aquaculture such as prawn culture in mangrove systems in South and Southeast Asia. In other cases, it is the result of off-site developments such as excessive upstream water use, exemplified by the loss of the Amu Darya and...
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详细
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2003/03/01
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工作文件（编号系列）
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26327
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1
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1
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2010/07/01
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Disclosed
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Wetlands management
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review of water