Modeling release of fecal coliforms is an important component of fate and transport simulations related to environmental water quality. Manure constituents other than fecal coliforms may serve as natural tracers of fecal contamination provided that their release from manure to runoff is similar to the fecal coliform release. The objectives of this work were to compare release of fecal coliforms (FC), chloride (Cl−), organic carbon (OC), and water-soluble phosphorus (P) from dissolving manure and to assess the performance of three models in describing the observed release. Bovine manure was applied on 0.5- by 0.3-m bare and vegetated subplots with 20% slope on sandy loam and clay loam soils. Concentrations of Cl−, FC, OC, and P were measured in runoff collected from troughs at the edges of the subplots at 5-min intervals during 1-h rainfall simulations. The one-parametric exponential model and two-parametric Vadas-Kleinman-Sharpley model and Bradford-Schijven model were fitted to the data. The Bradford-Schijven model had uncorrelated parameters, one of which was linearly related to the irrigation rate, and another parameter reflected the presence or the absence of vegetation. Kinetics of the FC release from manure was similar to the release kinetics of P and OC. The Bradford-Schijven model is recommended to simulate the release of manure constituents.
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机译：粪便大肠杆菌的释放模型化是与环境水质有关的命运和运输模拟的重要组成部分。粪便大肠菌群以外的粪便成分可以用作粪便污染的自然示踪剂，条件是它们从粪便到径流的释放与粪便大肠菌的释放相似。这项工作的目的是比较粪便大肠菌（FC），氯化物（Cl -），有机碳（OC）和水溶性磷（P）从溶解肥料中的释放，并评估粪便中的粪便。三个模型在描述观察到的释放中的性能。在砂壤土和黏土壤土上，以20％的坡度将牛粪涂在0.5 x 0.3 m的裸露且无植被的亚地表上。在1小时的降雨模拟过程中，以5分钟为间隔，测量了从子图边缘的谷中收集的径流中Cl -，FC，OC和P的浓度。将一参数指数模型和二参数Vadas-Kleinman-Sharpley模型以及Bradford-Schijven模型拟合到数据中。 Bradford-Schijven模型具有不相关的参数，其中一个与灌溉速率线性相关，而另一个参数则反映了植被的存在与否。粪便中FC释放的动力学与P和OC的释放动力学相似。建议使用Bradford-Schijven模型来模拟肥料成分的释放。
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