Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:Our results explain why soil redox status, base status, and total P content relate strongly to P mineralization (Verhoeven et al. 1996) and are consistent with observations in highly managed wetlands, where eutrophication status changed in
 response to alterations of the groundwater-regime (e.g.,‚Ä¶
Category: