中文摘要：

2O05年4月11日～2O06年5月8日，利用静态箱／气相色谱法对成都平原蔬菜地N2O排放进行定位观测，分析了蔬菜地N2O排放特征及氮肥、土壤湿度、土壤温度及蔬菜生长对N2O排放的影响，为准确估算蔬菜地N2O排放提供基础数据．结果表明，土壤一蔬菜系统在不施氮和施氮（2O0kg，hm^2）情况下，N2O平均排放通量分别为（58．7±13．9），（83．8±16．2）μg/（m^2·h）．施氮引起的N2O排放量占施氮量的O．38％．施氮蔬菜生长期N2O排放呈双峰型季节变化趋势．休闲期N：O排放波动较小，但土壤翻耕导致出现1周左右的突跃性高排放．施氮增加N2O排放量的效应随不同蔬菜生长期间单位时间施肥强度的增加而增大．蔬菜生长期和休闲期N2O排放通量与土壤水分（WFPS）呈显著负相关（P〈0．05）．土壤温度与春季蔬菜生长期N2O排放通量呈显著正相关（P〈0．05），但与冬季蔬菜和休闲期土壤N2O排放的相关性不显著．同时，不施氮情况下，蔬菜地N2O排放通量高于水稻～油菜轮作系统，施氮蔬菜地N2O排放系数也稍高于水稻一油菜系统，表明成都平原蔬菜地N2O排放强度高于大宗粮食作物农田的排放强度．

英文摘要：

N2O emission from soil-vegetable system in Chengdu Plain of Sichuan Basin was measured using static chamber/gas chromatograph techniques from April 11, 2005 to May 8, 2006. N2O emission characteristics and the impact factors of N application, soil moisture, soil temperature and vegetable growth were investigated, which provide basic data for accurate estimation of N2O emission from the vegetable land. The mean emission flux of N2O were （58.7±13.9）,（83.8±16.2）μg/（m^2.h） without N application and with application of 2O0kg N/hm^2, respectively, in the soil-vegetable ecosystem. The total N2O loss derived from N applied accounted for 0.38%. The seasonal variation of N2O emission was double-pulses during vegetable growing period. N2O emission fluctuated at low level at fallow but increased remarkably due to soil tillage. The effects of N application on N2O emission enhanced with increasing of N application rate. N2O fluxes were negatively related to soil moisture in vegetable growing period and at fallow. The positive relationship between N2O emission and soil temperature was significant in spring vegetable season but not in winter vegetable season and at fallow. N2O emission flux was higher in the vegetable land than that in cropland without N application, meanwhile, total N2O loss derived from N application in vegetable land was slight higher than that in cropland under N application. The N2O emission rate from the vegetable land was higher than that in the cropland in chengdu Plain of Sichuan Basin.