Abstract
Both bacteria and fungi contribute to nitrous oxide (N2O) emissions through denitrification in soils; however their contributions to N2O emissions in paddy soil with different soil textures are unclear. In this study, N2O emission flux and production potential were determined using the substrate-induced respiration (SIR) inhibition method with or without acetylene addition. Fungi contributed more to N2O emission flux than bacteria in loam and clay soils, and their contribution to N2O production potential was higher than that of bacteria in loam soil. Moreover, the contributions of fungi and bacteria to N2O emission flux and production potential were higher in clay soil than in loam soil. Thus, fungi play a significant role in N2O emissions from paddy soils, which was highly dependent on soil texture. Therefore, the role of fungal denitrification in N2O emission flux in paddy soils should be investigated in future research.
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