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The effect of biodiversity on ecosystem func tion is complex and requires understanding of all interacting systems, such as hydr ology, geology and above ground plant diversity of the study area. In this study hydrogeoch emical modeling using PHREEQC was used to investigate the effect external fact ors (nearby river Saale and an underground channel) on the groundwater chemistry of a large grassland diversity experiment (Jena experiment). Groundwater chemical analys is was performed for river Saale and groundwater ...