Dep. of Civil Engineering, National Univ. of Ireland, Galway, Rep. of Ireland.
J Environ Qual. 2009 Dec 30;39(1):185-92. doi: 10.2134/jeq2008.0514. Print 2010 Jan-Feb.
The aim of this study was to compare the nutrient and sediment releases from five Irish tillage soils, inclined at 10- and 15-degree slopes, under a simulated rainfall intensity of 30 mm h(-1) in a controlled laboratory study. Using the relationship between soil test phosphorus (STP) in the five soils and the dissolved reactive phosphorus (DRP) released in surface runoff, a runoff dissolved phosphorus risk indicator (RDPRI) was developed to identify the STP level for Irish tillage soils above which there may be a potential threat to surface water quality. The results of this study indicated that tillage soils may produce surface runoff P concentrations in excess of 30 microg L(-1) (the value above which eutrophication of rivers is likely to occur and the maximum allowable concentration of DRP in rivers under the EU Water Framework Directive, WFD) if their Morgan's phosphorus (P(m)), Mehlich 3 phosphorus (M3-P), and water extractable phosphorus (WEP) concentrations exceed 9.5 mg L(-1), 67.2 mg kg(-1), and 4.4 mg kg(-1), respectively. This work reinforces the statutory agronomic based requirements of the European Communities (Good Agricultural Practice for Protection of Waters) Regulations 2009 (S.I. no. 101 of 2009). A statistical analysis showed that WEP gave the best prediction for runoff DRP.
本研究旨在比较在 30 毫米/小时的模拟降雨强度下，5 种爱尔兰耕作土壤在 10-15 度坡度下的养分和沉积物释放情况。在受控实验室研究中，利用 5 种土壤中的土壤测试磷（STP）与地表径流中溶解反应磷（DRP）之间的关系，开发了径流溶解磷风险指标（RDPRI），以确定爱尔兰耕作土壤中 STP 水平，超过该水平可能对地表水质量构成潜在威胁。研究结果表明，如果土壤的摩根磷（P(m)）、梅利希 3 磷（M3-P）和水可提取磷（WEP）浓度分别超过 9.5 毫克/升、67.2 毫克/千克和 4.4 毫克/千克，那么耕作土壤可能会产生超过 30 微克/升的地表径流 P 浓度（这是河流富营养化可能发生的浓度，也是欧盟水框架指令（WFD）下河流中 DRP 的最大允许浓度）。这项工作加强了欧洲共同体（保护水域的良好农业做法）法规 2009 年（2009 年第 101 号 SI）的法定农业要求。统计分析表明，WEP 对径流 DRP 的预测效果最佳。
