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(a) N2O emission profile of pile 1. The arrows indicate the turnings. The gray dotted line indicates the detection limit. (b) δ15Nbulk, δ18O, and site preference (SP) of N2O. Open triangles indicate δ15Nbulk, open squares indicate δ18O, and closed circles indicate the site preference. The standard site preferences of N2O from nitrification (33‰) and denitrification (0‰) are also indicated (44).
