Phosphorus (P) fluxes from forest soils are not well understood. For temperate zone forests, there is some evidence from watershed studies that P export occurs mainly in preferential flow pathways during storm events after dry periods. Therefore, we tested the practical applicability of a sampling approach, which should allow for quantifying P concentrations and fluxes. We used zero‐tension lysimeters, which were installed beneath the topsoil and in the subsoil at plots in the Tharandt Forest (Saxony, East Germany). Two storm events after dry periods were simulated by means of experimental sprinkler irrigation. Preferential flow water collected with the zero‐tension lysimeters was analyzed for total P (TP), particulate P (PP), dissolved organic P (DOP) and dissolved inorganic P (DIP), and the respective P fluxes were calculated. The results indicate that the experimental approach is applicable to estimate fluxes of different P fractions in preferential flow. Measured data point toward a distinct flushing of P in the first hours of heavy rainfall events with PP fraction playing a dominant role. In general, P concentrations decreased quickly during the first 2 h of irrigation and then remained constant. Initial concentrations and cumulative fluxes were highest in the subsoil samplers. For a better understanding of underlying processes, further research with a special focus on the PP fraction is necessary.

中文翻译：

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在森林土壤中通过优先流动路径浸出溶解的磷和颗粒状磷：使用零张力测渗仪的方法

森林土壤中的磷（P）通量尚不十分清楚。对于温带森林，流域研究表明，磷的输出主要发生在干旱期后的暴雨事件中的优先流动路径中。因此，我们测试了采样方法的实际适用性，该方法应可量化P浓度和通量。我们使用零张力测力计，该测力计安装在Tharandt森林（东德萨克森州）的地块下表土和地下土壤中。通过实验洒水灌溉模拟了干旱期后的两次暴风雨事件。分析了用零张力测渗仪收集的优先流动水的总P（TP），颗粒P（PP），溶解的有机P（DOP）和溶解的无机P（DIP），并计算了各自的P通量。结果表明，该实验方法适用于估算优先流中不同P组分的通量。实测数据表明，在暴雨的最初几个小时中，P的冲洗明显不同，其中PP占主导地位。通常，在灌溉的前2小时内P浓度迅速下降，然后保持恒定。在地下土壤采样器中，初始浓度和累积通量最高。为了更好地了解基本过程，有必要对PP组分进行专门研究。在灌溉的前2小时，P浓度迅速下降，然后保持恒定。在地下土壤采样器中，初始浓度和累积通量最高。为了更好地了解基本过程，有必要对PP组分进行专门研究。在灌溉的前2小时，P浓度迅速下降，然后保持恒定。在地下土壤采样器中，初始浓度和累积通量最高。为了更好地了解基本过程，有必要对PP组分进行进一步研究。