中文摘要：

基于涡度相关技术，于2004年生长季对三江平原稻田CO2通量进行了观测．结果表明，CO2通量日变化特征明硅；月平均的CO2通量日变化幅度很大，6-9月，夜间最大净排放通量分别为0．23，0．23，0．18，0．12mg／（m^2·s）；白天最大净吸收通量分别为-0．14，-0．68，-0．66，-0．22mg／（m^2·s）．白天CO2通量的变化与光合有效辐射明显相关，并且逐月变化．利用摩擦速度（队）的闽值进行筛选，夜间通量与温度之间无明显相关同期观测的静态箱法结果表明。夜间通量与空气和土壤温度相关,整个生长季，生态系统从大气中吸收的C为5.30t／hm^2.

英文摘要：

The CO2 flux of the dee field of Sanjiang plain were measured during the growing season in 2004, based on eddy correlation system. Diurnal variation of CO2 was obvious with great change range of its monthly average; from 6-9 mouth, the greatest net emission fluxes at night were 0.23, 0.23, 0.18, 0.12mg/（m^2·s）, respectively; at day, the greatest fluxes were -0.14, -0.68, -0.66, -0.22mg/（m^2·s）,respectively. The variation of fluxes at day were related obviously with photosynthetically active radiation, with derived relationship varying monthly. Nighttime CO2 fluxes corrected by friction velocity U. was not related obviously with temperature, but the fluxes of same time measured by static chamber technique was related obviously with air and soil temperature. In the whole growing season, the ecosystem uptake C from atmosphere was 5.30t/hm^2.