Carbon (C) substrates are critical for regulating denitrification, a process that results in nitrous oxide (N2O) and dinitrogen (N2) emissions from soil. However, the impacts of C on concomitant soil carbon dioxide (CO2) N2O under varying types water contents not well studied. Three repacked Pallic grassland soils, texture phosphorus (P) status, containing NO3−-15N were held at three levels mat...