中文摘要：

气候变暖是当今人类面临最重要的环境问题之一，导致气候变暖的主要原因是大气中温室气体浓度不断增加。氧化亚氮（N20）是仅次于CO2和CH4的第三大温室气体，以100年计，单位质量N20增温效应是CO2的298倍。

英文摘要：

A laboratory incubation experiment was conducted to investigate nitrous oxide （N20） emissions in the soil, which was sampled from a red soil of a Pinus massoniana forest in a typical hilly red soil region in subtropical central China, and to study impacts of the soil temperature and moisture on N20 emissions. The experiment was designed with two environmental factors （temperature and moisture） and 4 - 5 levels of factors. The results showed that at temperatures of 15, 25 and 30 ℃ and at soil moistures of WFPS =40% -60% for 15 days the N20 emissions all displayed a similar trend with a low rate at first, rapid increase during the middle period and no emission in the end. The cumulative N20 fluxes of the treatments for a period of 15 days were up to 242.85 mg N·kg-1. Both the nitrification and denitrification processes were inhibited at 5 ℃, as a result, the average value of the cumulative N20 fluxes was just 0.55 mg N·kg-1. At WFPS =20% -30%, the cumulative N20 fluxes for 15 days were very low, ranging from 1.92 to 2.72 mg N·kg-1 The average cumulative N20 fluxes increased with the increases of soil temperature and moisture, especially when WFPS was greater than 40%. A N20 emission prediction model was established and the model parameters were determined by the nonlinear optimization estimation. The optimization results suggested that the Q J0 of N20 emissions for soil nitrification and denitrification processes was 1.15 and 3.0, respectively; the optimal soil moisture for nitrification-induced N20 emissions was at WFPS = 56% ; and the soil WFPS exponential response coefficient for N20 emissions from soil denitrification was 8.8.