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首页> 外文期刊>Journal of the American Water Resources Association >URBAN IMPACTS ON STREAMS ARE SCALE-DEPENDENT WITH NONLINEAR INFLUENCES ON THEIR PHYSICAL AND BIOTIC RECOVERY IN VERMONT,UNITED STATES
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URBAN IMPACTS ON STREAMS ARE SCALE-DEPENDENT WITH NONLINEAR INFLUENCES ON THEIR PHYSICAL AND BIOTIC RECOVERY IN VERMONT,UNITED STATES

机译：城市对流域的影响与规模有关，而非线性影响对其在美国佛蒙特州的物理和生物恢复

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摘要

The physical and biological conditions of stream reaches in 16 watersheds within the Lake Cham-plain Basin of Vermont, United States, were assessed and analyzed for a response to total impervious area (TIA) at multiple spatial scales. Natural gradients (e.g., channel slope) and human impacts to channel boundary conditions (e.g., bank armoring) were considered to ensure a robust test of the Impervious Cover Model for ups-lope TIA. The response of geomorphic stability and sensitive macroinvertebrates to TIA was nonlinear and significant (p < 0.001), decreasing rapidly at 5% TIA. The effect of urbanization on stream condition was shown to interact significantly with drainage area and channel slope using the analysis of covariance (ANCOVA) (p < 0.05). Hydraulic geometry regressions for urban and rural watersheds and ANCOVA were used to describe a significant watershed scale-dependent response of channel width to urbanization (p = 0.001). The analysis of macroinvertebrate data from reaches in different stages of channel evolution indicated that stable reaches supported greater richness of pollution intolerant species (p < 0.001) and overall taxa richness (p < 0.01) than unstable reaches, and that biotic integrity improves as channels regain stability during their evolution into a state of quasi-equilibrium. We conclude that macroinvertebrate communities can respond positively to channel evolution processes leading to natural channel restabilization.
机译：评估和分析了美国佛蒙特州湛普兰湖盆地内16个流域内河流的物理和生物学条件，以分析其在多个空间尺度上对总不透水面积（TIA）的响应。考虑自然梯度（例如，通道坡度）和人类对通道边界条件的影响（例如，堤防），以确保对不透水覆盖模型进行稳健的TIA测试。地貌稳定性和敏感的大无脊椎动物对TIA的响应是非线性且显着的（p <0.001），在5％TIA时迅速下降。协方差分析（ANCOVA）显示，城市化对河流条件的影响与流域面积和河道坡度之间存在显着相互作用（p <0.05）。城乡流域和ANCOVA的水力几何回归用于描述河道宽度对城市化的显着分水岭规模依赖性响应（p = 0.001）。对来自渠道演变不同阶段的大型无脊椎动物数据的分析表明，与不稳定的地区相比，稳定的地区支持更大的污染耐受性物种（p <0.001）和总体分类单元丰富度（p <0.01），并且生物完整性随着渠道的恢复而改善在演化为准平衡状态时保持稳定。我们得出的结论是，无脊椎动物群落可以对导致自然通道稳定的通道进化过程做出积极反应。

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