Recent research on tile-drainage has placed emphasis on dissolved reactive phosphorus (DRP) delivery and transport pathways but less emphasis on particulate P (PP), resulting in its exclusion from agricultural water management models. In this study, we quantified the fluxes, mechanisms, and factors driving PP delivery into tiles through statistical analysis of a long-term hydrologic and water quality dataset. The dataset includes 5 yr of surface and tile discharge, total P (TP), DRP, total nitrogen (TN), and dissolved inorganic N concentrations from two edge-of-field study sites with contrasting soil and management practices. Hydrograph recession techniques were coupled with multiple linear regression for understanding hydrologic flow pathways, and empirical mode decomposition (EMD) time-series analysis was used to determine the significance of PP seasonality processes and the effect of management practices. The analysis of hydrologic flow pathways demonstrated that quickflow contributed 66 and 36% of subsurface discharge in the clay and loam sites, respectively. Phosphorus loading analysis showed that macropore flow plays a significant role in PP delivery to subsurface P loading and that PP significantly contributed to TP and DRP delivery; however, greater PP loadings were observed at the clay site despite greater subsurface discharge and soil test P levels at the loam site. Furthermore, PP delivery was significantly affected by environmental conditions and management practices. We highlight the efficacy of hydrograph recession analysis for identifying macropore and diffuse drainage, of P/N ratios to characterize sediment delivery mechanisms in tiles, and of EMD to detect management impacts on TP and DRP at the field scale.

中文翻译：

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优先流和农业生态系统管理对瓦片排水景观中地下颗粒磷负荷的影响

最近关于瓷砖排水的研究强调溶解活性磷 (DRP) 的输送和运输途径，但不太重视颗粒状 P (PP)，导致其被排除在农业用水管理模型之外。在这项研究中，我们通过对长期水文和水质数据集的统计分析，量化了推动 PP 输送到瓷砖中的通量、机制和因素。该数据集包括 5 年的地表和瓷砖排放、总磷 (TP)、DRP、总氮 (TN) 和来自两个具有对比土壤和管理实践的田间研究地点的溶解无机氮浓度。水道图衰退技术与多元线性回归相结合，以了解水文流动路径，经验模式分解 (EMD) 时间序列分析用于确定 PP 季节性过程的重要性和管理实践的影响。对水文流动路径的分析表明，在粘土和壤土场地，快流分别贡献了 66% 和 36% 的地下流量。磷负载分析表明，大孔流动在 PP 向地下 P 负载的输送中起重要作用，并且 PP 对 TP 和 DRP 的输送有显着贡献；然而，尽管壤土场地的地下排放和土壤测试 P 水平更大，但在粘土场地观察到更大的 PP 负载。此外，PP 的交付受到环境条件和管理实践的显着影响。我们强调了水道图衰退分析在识别大孔和扩散排水方面的功效，