Abstract Nutrient export from agricultural land to surface waters is a significant environmental concern within the Great Lakes Basin (GLB). A field-based watershed-scale study was completed to investigate spatial and temporal variations of phosphorus and nitrate to assess nutrient transport pathways and groundwater-surface water interactions in an agriculturally dominated clay plain system. This was conducted in the 127 km2 Upper Parkhill Watershed, near Lake Huron in southwestern Ontario, Canada. Data collection occurred from June 2018 to May 2019 via continuous sensor deployment and discrete sampling of stream water, groundwater, hyporheic zone, and tile drainage water. Samples were analyzed for various nutrient species (total, total dissolved, soluble reactive, and particulate phosphorus, and nitrate-N) to examine the hydrological dynamics of principal transport pathways of agriculturally-derived nutrients. Total phosphorus and nitrate concentrations in stream water ranged from 0.007 to 0.324 mg/L and 0.32 to 13.13 mg NO3−-N/L, respectively. Tile drainage water total phosphorous concentrations varied from 0.006 to 0.066 mg/L. Groundwater total dissolved phosphorus concentrations ranged from

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五大湖粘土平原系统中地下水-地表水相互作用和农业养分输送

摘要 从农业用地到地表水的养分输出是五大湖流域 (GLB) 内一个重要的环境问题。完成了一项基于实地的流域规模研究，以调查磷和硝酸盐的时空变化，以评估以农业为主的粘土平原系统中的养分运输途径和地下水-地表水相互作用。这是在加拿大安大略省西南部休伦湖附近 127 平方公里的上帕克希尔流域进行的。数据收集发生在 2018 年 6 月至 2019 年 5 月期间，通过连续传感器部署和对河流水、地下水、潜流带和瓦片排水水的离散采样。分析样品的各种营养物质（总磷、总溶解磷、可溶性活性磷和颗粒磷，和硝酸盐-N）来检查农业衍生养分的主要运输途径的水文动态。河流水中的总磷和硝酸盐浓度分别为 0.007 至 0.324 毫克/升和 0.32 至 13.13 毫克 NO3--N/L。瓷砖排水总磷浓度从 0.006 到 0.066 毫克/升不等。地下水总溶解磷浓度范围为