Assessment of 15 NH 4 + reflux and its effect on gross N mineralization rates In live soils the amount of 15 N recovered in different NH 4 + sinks either increased significantly over incubation time (Forest soil: NO 3 − , DON, N fixed ; Grassland soil: NO 3 − , N fixed ) or did not show a clear trend (Grassland soil: DON; Fig. 2 ).
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Full <sup>15</sup>N tracer accounting to revisit major assumptions of <sup>15</sup>N isotope pool dilution approaches for gross nitrogen mineralization.
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