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Study area with the location of the Julius Kühn institute (JKI) and the 32 regional sampling sites (left, map data by OpenStreetMap, under ODbL) and the institutes area with the location of the four local sampling sites (right, image data by © GeoBasis-DE/LVermGeoRP (2022)). The arrow indicates the study area in Rhineland-Palatinate on the map of Germany.
