Figure 6. Average percentage of ¹⁵N recovered in various pools.

Denitrification denotes ¹⁵N that was present as ²⁹⁺³⁰N₂, DNRA denotes ¹⁵N that was present as ¹⁵NH₄ ⁺ and intracellular storage represents ¹⁵N which was present as either ²⁹⁺³⁰N₂ or ¹⁵NH₄ at the termination of the secondary incubation to which no additional ¹⁵NO₃ was added. The ‘missing label’ fraction refers to the discrepancy between added ¹⁵NO₃ ⁻, measured ¹⁵NO₃ ⁻ and ¹⁵N₂ production (shown in Fig. 4). Error bars are overall SD (n = 3)