ABSTRACT

This study evaluates a range of scenarios to reduce soluble reactive phosphorus (SRP) losses using the surface runoff phosphorus transport model (Surphos) to simulate the application of liquid manure (slurry) to grassland catchments. Surphos was applied using data from two contrasting sites in the Republic of Ireland and Northern Ireland. It explored scenarios that investigated changes to the timing of slurry applications, based both on policy (i.e. a “closed” period where regulations prohibit any slurry spreading) and on climate-based restrictions, where soil moisture and antecedent rainfall were important factors. The observed data showed a considerable spatial variability in runoff at both sites, which resulted in a corresponding variable range of SRP losses predicted by the model. However, at both sites the model results showed that maintaining a closed period led to a greater reduction in SRP losses than opening this period up to slurry applications under climate-based restrictions.

摘要

本研究评估了一系列减少可溶性活性磷 (SRP) 损失的情景，使用地表径流磷传输模型 (Surphos) 来模拟将液体肥料（泥浆）应用于草地集水区。Surphos 应用来自爱尔兰共和国和北爱尔兰两个对比地点的数据。它探讨了调查泥浆施用时间变化的情景，基于政策（即法规禁止任何泥浆扩散的“封闭”时期）和基于气候的限制，其中土壤水分和前期降雨是重要因素。观测数据显示，两个地点的径流存在相当大的空间变异性，这导致模型预测的 SRP 损失的相应可变范围。然而，