Fig. 3: Summary of proxy data from peat cores C1, C4, and C6 at CD peatland (age scale based on Bacon age-depth model).

The calendar age is relative to 1950 CE. a Suess-effect-corrected bulk peat δ13C (δ13Cpeat; ‰); b Percentages of C loss in peat samples (C loss %); c Carbon accumulation rates (CAR; g C m−2 yr-1); d Nitrogen accumulation rates (NAR; g N m−2 yr-1). For a to d, the bone lines represent 5-ponits moving average curves. The gray band denotes centennial accumulation nadir (CAN; from 750 to 100 cal. yr B.P.) and green band denotes centennial accumulation optimum (CAO; from 2000 to 1500 cal. yr B.P.). Depth scale and radiocarbon dating points are shown above. The right panel from (e) to (h) shows distributions and mean values of these data during CAN and CAO. The different letters denote statistically significant differences in post hoc Tukey’s HSD test for multiple comparisons.