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首页> 外文期刊>Journal of the American Water Resources Association >DEVELOPMENT OF AN INVERTEBRATE COMMUNITY INDEX FOR AN ALABAMA COASTAL PLAIN WATERSHED
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DEVELOPMENT OF AN INVERTEBRATE COMMUNITY INDEX FOR AN ALABAMA COASTAL PLAIN WATERSHED

机译:阿拉巴马州沿海平原流域无脊椎动物群落指标的开发

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摘要

Activities such as agriculture, silviculture, and mining contribute nonpoint pollution to Alabama's streams through polluted runoff and excessive sedimentation. Highly erodible soils characteristic of the Choctawhatchee-Pea Rivers watershed, combined with intense rainfall and land use practices, contribute large amounts of sediment to streams. Biological monitoring can reflect the acute impacts of pollutants as well as prolonged effects of habitat alteration, and development of biological criteria is important for the establishment of enforceable laws regarding nonpoint source pollution. Macroinvertebrates were collected from 49 randomly selected sites from first through sixth-order streams in the Choctawhatchee-Pea Rivers watershed and were identified to genus level. Thirty-eight candidate metrics were examined, and an invertebrate community index (ICI) was calibrated by eliminating metrics that failed to separate impaired from unimpaired streams. Each site was scored with those metrics, and narrative scores were assigned based on ICI scores. Least impacted sites scored significantly lower than sites impacted by row crop agriculture, cattle, and urban land uses. Conditions in the watershed suggest that the entire area has experienced degradation through past and current land use practices. An initial validation of the index was performed and is described. Additional evaluations of the index are in progress.
机译:农业,造林和采矿等活动通过污染的径流和过多的沉积物,对阿拉巴马州的溪流造成了面源污染。 Choctawhatchee-Pea河流域的高侵蚀性土壤特征,再加上强烈的降雨和土地利用做法,为溪流贡献了大量沉积物。生物监测可以反映污染物的严重影响以及生境改变的长期影响,而生物学标准的制定对于建立有关非点源污染的可执行法律至关重要。从Choctawhatchee-Pea河流域的第一至第六阶流中的49个随机选择的地点收集了大型无脊椎动物,并将其识别为属水平。检查了38个候选指标,并通过消除了无法将受损人群和未受损人群分开的指标,对无脊椎动物群落指数(ICI)进行了校准。每个站点均使用这些指标进行评分,并根据ICI评分分配叙述性评分。受影响最小的地点得分大大低于受行作农业,养牛和城市土地利用影响的地点。分水岭的状况表明,过去和当前的土地使用做法使整个地区都在退化。对该索引进行了初步验证并进行了描述。该指数的其他评估正在进行中。

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