Soil map of Lower Saxony 1: 50 000 — Change in local relocation potential (exchange frequency) 2071-2100 to 1971-2000 No climate change scenario (RCP8.5)

The map shows the mean change in the local relocation potential for non-absorbable substances (including exchange frequency of soil water per year) 2071-2100 compared to 1971-2000 under the “No climate protection” scenario (RCP8.5). With the help of the exchange frequency (AH) of soil water, the local relocation potential for non- or weakly absorbable substances can be described. The AH indicates how often the soil solution is exchanged in the effective root zone in the course of leachate displacement. The lower the water storage and retention capacity of a soil, the greater its frequency of exchange of soil water. Statements on the concentration and cargo of non-sorbable substances cannot be mapped with the method. For nitrate, deposition, denitrification and mineralisation are not taken into account. Depending on the location, they can have a significant impact on nitrate availability and concentration in leachate. The climate models are driven by the “No-Climate Protection” scenario (RCP8.5). This is a scenario of the IPCC, which describes a continuous increase in global greenhouse gas emissions, resulting in an additional radiative propulsion of 8.5 watts per m² compared to pre-industrial levels by the end of the 21st century. The results of all climate models are equally likely. Therefore, in addition to the mean, which shows a tendency, the upper (maximum) and lower (minimum) edge of the result bandwidth can be retrieved via the maptip.本地图展示了"无气候保护情景"（RCP8.5）下，2071-2100年相较于1971-2000年，非可吸收物质（含年土壤水交换频次）的局地迁移潜力平均变化。借助土壤水交换频次（AH），可表征非可吸收或弱可吸收物质的局地迁移潜力。AH指渗滤液运移过程中，有效根区范围内土壤溶液的交换频次。土壤的储水持水能力越低，其土壤水交换频次越高。该方法无法表征非可吸附物质的浓度与载荷。对于硝态氮而言，沉降、反硝化与矿化过程均未纳入考量。不同区位下，这些过程会对渗滤液中硝态氮的有效性与浓度产生显著影响。本研究采用的气候模型由"无气候保护情景"（RCP8.5）驱动。该情景由政府间气候变化专门委员会（IPCC）提出，描述了全球温室气体排放量持续增长的情形，至21世纪末，相较于工业化前水平，额外辐射强迫达8.5瓦每平方米。所有气候模型的结果具有同等可信度。因此，除了体现变化趋势的平均值外，还可通过地图提示（maptip）获取结果区间的上限（最大值）与下限（最小值）。