Abstract Black Creek, a headwater to the Maumee River and western Lake Erie, is an agricultural basin with a mix of cropland (66%), pasture (19%), and forest (7%) linked by a road network to the rural community. Suspended sediment was collected monthly during the 2018 water year for the main stem and two sub-basins using in-situ, passive samplers that integrated a range of streamflow conditions. Sediment fingerprinting used 44 indicators to apportion samples among five sources: cropland, pasture, forest, road dirt, and streambanks. Cropland, pasture, and streambanks had similar ranges in sediment-bound phosphorus (679–1670 ppm). Cropland contributed 21 ± 15% (monthly mean ± standard deviation; 0–46% among individual months) of suspended sediment during the year. Fall and spring peaks in cropland contribution highlight the ongoing importance of on-field management, but this small contribution of suspended sediment relative to the expanse of cropland may reflect implementation of best-management practices. Pasture contributed 0–66% (16 ± 19%) of suspended sediment and roads 0–26% (6 ± 6%). Streambanks contributed 12–100% (55 ± 25%) and was the only source identified in all sediment samples. In this basin, most cropland-adjacent streambanks are protected by a riparian setback. However, streams traversing other land-use types are not as consistently protected, and these setbacks do not protect the stream channel from discharge of water from sump pumps, road culverts, or tile drains. The contribution of sediment from other land uses combined with that from the agricultural drainage network (as streambank material) underscores the need to consider water movement in the basin as a whole.

中文翻译：

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伊利湖西部农业支流的每月悬浮沉积物分配

摘要 Black Creek 是 Maumee 河和伊利湖西部的源头，是一个农业流域，由农田 (66%)、牧场 (19%) 和森林 (7%) 组成，通过公路网络与农村社区相连. 在 2018 水年期间，使用集成了一系列水流条件的原位被动采样器每月收集主干和两个子流域的悬浮沉积物。沉积物指纹识别使用 44 个指标在五个来源之间分配样本：农田、牧场、森林、道路污垢和河岸。农田、牧场和河岸的沉积物结合磷含量范围相似（679-1670 ppm）。农田在一年中贡献了 21 ± 15%（月平均值 ± 标准偏差；个别月份为 0-46%）的悬浮泥沙。农田贡献的秋季和春季高峰突出了现场管理的持续重要性，但相对于农田的广阔范围，悬浮泥沙的这一小贡献可能反映了最佳管理实践的实施。牧场贡献了 0–66% (16 ± 19%) 的悬浮泥沙，道路贡献了 0–26% (6 ± 6%)。河岸贡献了 12–100% (55 ± 25%)，是所有沉积物样本中唯一确定的来源。在这个流域，大多数与农田相邻的河岸都受到河岸退缩的保护。然而，穿越其他土地利用类型的河流并没有得到一致的保护，这些挫折并不能保护河道免受污水泵、道路涵洞或瓷砖排水沟的排放。