Illustrating mechanisms of N 2O generation in and emissions of CO 2 and CH 4 from the soil could help us design greenhouse gas mitigation strategies. An experiment was carried out in fields of acid red soil different in land use, i. e. vegetable garden, paddy field, tea garden and forest in Jinjing river region, Changsha, to study effects of application of carbon, nitrogen and nitrification inhibitor on N 2O, CO 2 and CH 4 emissions under constant temperature and soil moisture, using the static incubation-gas chromatograph method. Results show that less N 2O emission was observed from the acid red soil, low in pH, after application of N fertilizer; the addition of glucose stimulated N 2O emission from the soil applied with urea and from soil denitrification. Heterotrophic nitrification might be the main pathway of N 2O generation in acid red soil and nitrification inhibitor Dicyandiamide (DCD) had no significant effect on N 2O reduction in the acid red soil. In terms of total N 2O emission from the soil applied with N and C, the fields different in land use followed the order of tea garden > vegetable garden > paddy field > forest land. Extraneous organic carbon could significantly stimulate soil C0 2 emission from the four fields, showing an order of tea garden and paddy field > vegetable garden and forest land, but did not have much effect on CH 4 emission in all the four fields except paddy field.
