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首页> 外文会议>AWRA's 2000 Summer Specialty Conference on Riparian Ecology and Management in Multi-Land USE Watersheds Aug 28-31, 2000 Portland, Oregon >THE CUMULATIVE IMPACTS OF WATERSHED URBANIZATION ON STREAM-RIPARIAN ECOSYSTEMS
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THE CUMULATIVE IMPACTS OF WATERSHED URBANIZATION ON STREAM-RIPARIAN ECOSYSTEMS

机译：流域城市化对流－带生态系统的累积影响

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摘要

Historically, watersheds of the Puget Sound lowland ecoregion contained an abundance of complex, diverse, and productive salmonid habitat in the form of small stream ecosystems and associated riparian ecotones. However, development of these lowland watersheds has significantly impacted the ecological integrity of their aquatic ecosystems. The cumulative effects of watershed urbanization have resulted in a loss of natural forest and wetland cover, as well as a significant increase in impervious surface area. Riparian forests, floodplains, and off-channel wetlands have also been severely degraded by the incremental encroachment of residential and commercial development. The decline in ecological integrity of the stream-riparian ecosystem begins at very low levels of watershed development and continues with increasing watershed urbanization. A conservation-based strategy for managing stream-riparian ecosystems in urbanizing watersheds should be adopted if the remaining salmonid resources are to be protected and to facilitate recovery of those already in decline. Initial research indicates that maintaining natural riparian corridors around streams and wetlands can have a positive influence on ecological integrity even at moderate levels of watershed development. These results suggest that resource managers should place a high priority on preservation of remaining high quality stream-riparian ecosystems. In addition, our long-term objective should be to actively manage for natural riparian buffers throughout our watersheds.
机译：从历史上看，普吉特海湾低地生态区的流域以小溪流生态系统和相关的河岸生态交错带的形式，包含了许多复杂，多样且生产性丰富的鲑鱼栖息地。然而，这些低地流域的发展严重影响了其水生生态系统的生态完整性。流域城市化的累积影响导致天然林和湿地覆盖率的损失，以及不透水表面积的显着增加。河岸森林，洪泛区和河道外的湿地也由于居住和商业发展的日益侵蚀而严重退化。流域-河岸生态系统的生态完整性下降始于流域发展的极低水平，并随着流域城市化程度的提高而继续。如果要保护剩余的鲑鱼资源并促进已经退化的鲑鱼资源的恢复，就应该采用一种基于保护的战略来管理城市化流域中的河岸生态系统。初步研究表明，即使在流域发展适度的水平上，维持河流和湿地周围的自然河岸走廊也可以对生态完整性产生积极影响。这些结果表明，资源管理者应高度重视保留剩余的高质量河岸生态系统。此外，我们的长期目标应该是积极管理整个集水区的天然河岸缓冲带。

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