Potential risk of nitrate discharge (federal method)

The potential risk of nitrate discharge is used to assess the risk of nitrate leaching from the root space of vegetation by leaching soil water. The location of the assessment is the lower bound of the rooted soil layer. The ratio of leachate rate and usable field capacity in the effective root space (nFKWe) first provides the exchange frequency of the plant-available soil water. This is classified in 5 stages (very low – very high) and gives the pNAG. The characteristic value of the potential risk of nitrate discharge is not suitable for deriving quantitative statements, as use-dependent influencing variables (e.g. crop type, quantities of nitrogen added and removed, autumn nitrate content in the soil) are not taken into account. The calculation of the potential nitrate discharge risk according to the federal method is based on the evaluation method 5.3 (AG Boden, 2000b). Further information can be found here: https://geo.brandenburg.de/karten/htdocs/21042020_Sickerwasserrate.pdf本数据集以硝酸盐淋出潜在风险为指标，通过土壤水淋洗过程，评估植被根区的硝酸盐淋失风险。评估点位设置为根系土层的下界。有效根区（nFKWe）内的淋出速率与有效田间持水量的比值，首先用于表征植物有效土壤水的交换频次。该比值被划分为5个等级（极低至极高），并由此计算得到pNAG值。由于该指标未纳入依赖于实际应用场景的影响变量（例如作物类型、氮素投入与移除量、土壤秋季硝酸盐含量），因此硝酸盐淋出潜在风险的特征值仅可用于定性分析，无法推导出定量结论。基于联邦方法的硝酸盐淋出潜在风险计算，依据评估方法5.3（AG Boden, 2000b）开展。更多详细信息可参阅以下链接：https://geo.brandenburg.de/karten/htdocs/21042020_Sickerwasserrate.pdf