《湿地生态学英文.pptVIP

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2016-12-29 发布于北京
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《湿地生态学英文.ppt

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Principles of Wetlands Ecology Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Topics covered in this lecture Wetland status and trends, causes of losses. Definitions and criteria used to identify and delineate wetlands. Wetlands functions and values. Overarching theme: the interplay of science, public policy and natural resource values Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. The way that wetlands are viewed has evolved over time: During settlement of the U.S., wetlands were considered “bug-infested, disease- ridden wastelands that impeded settlement and economic development. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Federal policies toward wetlands has evolved from policies and programs that encouraged drainage and filling of wetlands…… Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. …. to a federal policy of “no net loss” of wetlands, including subsidy and technical assistance to restore and create wetlands. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Estimated rate of wetlands loss 1950s – 1990s Wetlands Status and Trends 2000 458,000 Average annual net wetland loss for the conterminous United States 1950s – 70s 1980s – 90s 1970s – 80s 290,000 58,500 Acres Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Asp