以中国东北东部4种典型森林生态系统(人工红松林、落叶松林、天然次生蒙古栎林和硬阔叶林)为研究对象，采用静态暗箱-气相色谱法，比较其土壤N2O通量的季节动态及其影响因子.结果表明：在生长季, 4种森林生态系统土壤总体上表现为大气N2O的排放源, 其N2O通量大小顺序为：硬阔叶林(21.0±4.9 μg·m-2·h-1)> 红松林(17.6±4.6 μg·m-2·h-1)>落叶松林(9.8±5.9 μg·m-2·h-1)>蒙古栎林(1.6±12.6 μg·m-2·h-1).各生态系统的N2O通量没有明显的季节动态,只在夏初出现排放峰值(蒙古栎林为吸收峰).4种生态系统N2O通量均与10 cm深土壤含水量呈极显著正相关，与NO3--N呈显著负相关；N2O通量对土壤温度和NH4+-N的响应出现分异：针叶林N2O 通量与NH4+-N呈显著正相关，而与5 cm深土壤温度呈不相关；阔叶林与针叶林正相反.在较为干旱的2007年，土壤水分是影响4种林型土壤N2O通量的关键因子.植被类型与环境因子及氮素有效性对N2O通量的相互作用将是未来研究的重点.
Seasonal dynamics of N2O flux and its controlling factors for four representative temperate forests in northeastern China were examined with a static closed chamber-gas chromatograph technique. These forests were Korean pine (Pinus koraiensis) plantation, Dahurian larch (Larix gmelinii) plantation, Mongolian oak (Quercus mongolica) forest and hardwood broadleaved forest (dominated by Fraxinus mandshurica, Juglans mandshurica, and Phellodendron amurense). The results showed that all ecosystems were overall atmospheric N2O source during the growing season. The N2O flux (μg·m-2·h-1) decreased in order of the hardwood broadleaved forest (210±49)>the pine plantation (176±46)>the larch plantation (98±59)>the oak forest (16±126). Overall, there was no consistent seasonal pattern in N2O flux for the four ecosystems. The N2O flux was significantly positively correlated to soil gravimetric water content (0〖KG-*2〗-〖KG-*7〗10 cm depth) consistently for all ecosystems, but significantly negatively correlated to NO3--N content for each ecosystem. However, the responses of N2O flux to soil temperature and NH4+-N differed among the ecosystems. The N2O fluxes for the coniferous plantations were positively correlated to NH4+-N, but not correlated to the soil temperature at 5 cm depth; while those for the broadleaved forests displayed an opposite trend. The soil water content was the dominator of soil N2O emission for the forests in 2007 perhaps resulting from relative drought in the year. Interactions of vegetation type, environmental factor, and nitrogen availability to soil N2O emission should be further studied in the future.