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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 >WATERSHED SCALE ANALYSIS AND MANAGEMENT OF CUMULATIVE IMPACTS
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WATERSHED SCALE ANALYSIS AND MANAGEMENT OF CUMULATIVE IMPACTS

机译：流域规模分析和累积影响管理

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摘要

Analysis of the spatial distribution of development-related impacts to the riparian ecosystems of the Santa Margarita watershed in southern California shows that the cumulative impacts have been exacerbated beyond a mere agglomeration of the impacts of individual projects. The impacts of development on habitat structure, contiguity, and landscape context were evaluated using indices scaled to regional reference sites. Project specific impacts were mapped using ARC/INFO GIS and analyzed for spatial associations. Efforts to reduce impacts on a project-by-project basis have failed to prevent strong spatial autocorrelation. Along some streams, numerous small projects in close proximity have resulted in adverse impacts to entire stream reaches. Along other streams, patches of adverse impacts have fragmented the aquatic resources to a point where the overall functional capacity of the entire waterway may be unpaired. In addition, the ecological functions of unaffected areas have been diminished due to the prevalence of surrounding degraded areas. This approach can be used to identify locations in the watershed to focus restoration efforts. It can be used in a predictive manner in future watershed planning efforts to evaluate alternative development scenarios at a landscape-scale in order to ensure spatial heterogeneity and contiguity of critical riparian areas.
机译：对与加利福尼亚南部圣玛格丽塔河流域的河岸生态系统相关的发展相关影响的空间分布分析表明，累积影响已经加剧，而不仅仅是单个项目的影响集聚。使用根据区域参考地点定标的指数，评估了开发对栖息地结构，邻接性和景观环境的影响。使用ARC / INFO GIS绘制了项目特定影响，并分析了空间关联。减少每个项目的影响的努力未能阻止强大的空间自相关。沿着某些溪流，许多紧邻的小型项目对整个溪流造成了不利影响。沿着其他溪流，一系列的不利影响使水生资源分散，到整个水路的整体功能能力可能无法配对的地步。此外，由于周围退化地区的普遍存在，未受影响地区的生态功能已经减弱。该方法可用于识别流域中的位置，以集中修复工作。可以在未来的流域规划工作中以可预测的方式使用它来评估景观尺度上的替代发展方案，以确保关键河岸地区的空间异质性和连续性。

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