Soil phosphorus quantity–intensity relationships to predict increased soil phosphorus loss to overland and subsurface flow

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• 作者：Koopmans ; G.F. ; McDowell ; R.W. ; Chardon ; W.J. ; Oenema ; O. ; Dolfing ; J.
• 关键词：Adsorption ; Desorption ; Phosphorus ; Theory ; Threshold
• 刊名：Chemosphere
• 出版年：2002
• 期刊代码：15_00456535
• 类别：env
• 出版时间：August, 2002
• 卷：48
• 期：7
• 页码：679-687
• 文件大小：187 K

摘要

Soil phosphorus (P) quantity–intensity (q–i) relationships, based on common extraction methods, may potentially be used to estimate the risk of P loss in overland flow and subsurface drainage water. Some workers have used nonlinear q–i relationships to derive thresholds in soil test P (STP; a quantity factor) above which the risk of P loss increases, while others find linear relationships and no threshold. We present here a simple modelling exercise (based on Langmuir adsorption theory) along with data from literature to explain the behaviour of q–i relationships, and to give an explanation for this apparent discrepancy.