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To shed light on the interdependence between mineralisation rates, secondary transformation of peat and chemical composition, we combined results from a large microcosm study with peat chemical analyses. The results imply that chemical composition of highly decomposed topsoil peat is not the reason for higher mineralisation rates compared to subsoil peat, but rather a consequence of decomposition and transformation. Thus, peat mineralisation of drained organic soils under agriculture might not slow down over time due to gradually decreasing peat quality but could increase further.

https://onlinelibrary.wiley.com/doi/full/10.1002/jpln.202000475