中文摘要：

利用黑河计划数据管理中心提供的黑河大满灌区农田生态系统4套涡度相关仪和配套的气象观测站点的数据，在对通量和气象数据预处理前提下，得到完整可靠的CO2通量和配套的气象观测数据，计算4个站点的CO2通量（ Fc）、净生态系统交换量（ NEE）、总初级生产力（ GPP），分析它们的动态变化特征。结果表明，在研究区内，整个生长季Fc介于-2.78~0.60 mg/（m2·s），最小Fc出现在7月中下旬；整个生长期月平均Fc表现为“U”型曲线，在13：00达到峰值[-1.91 mg/（m2·s）]。夜间生态系统的碳通量与地表温度呈显著的指数关系，土壤温度是其主要影响因素；NEE最大碳吸收量出现在7月中旬，达到16.04 g/（m2·d），极个别与临近值变化趋势不同的数值，是由高温季节的强降雨天气导致；最终得到的生长季GPP在7月中旬日积累量达到最高[17.74 g/（m2·d）]。4个站点生长期的GPP总累积量分别是914.68 g/m2、937.03 g/m2、984.18 g/m2、1002.20 g/m2。

英文摘要：

The complete and reliable CO2 flux and supporting meteorological data were obtained after the preprocessing of flux and meteorological data with the data in four eddy covariance instruments and meteorological observation sites from HiWATER database in Heihe Daman irrigation from Heihe Plan Science Data Center,and the calculation of carbon dioxide flux（Fc）,the net ecosystem exchange （NEE）, and gross primary productivity（ GPP） were achieved,as well as their temporal dynamic characteristics. The result showed that in the study area,Fc ranged from -2. 78 mg/（m2·s） to 0. 60 mg/（m2·s） during the whole growing seasons,and the minimum Fc appeared in mid-late July;monthly average Fc showed “U”shaped curve throughout the growing season,at 13：00 reached its minimum value of -1. 91 mg/（m2·s）. Nighttime ecosystem carbon flux had a significant exponential relationship with surface temperature;NEE in growing season reached the maximum carbon absorption of 16. 04 g/（m2·d） in mid July. Some abnormalnbsp;values were caused by the heavy rain in high temperature season;finally GPP reached its top value of 17. 74 g/（m2·d） also in middle July. The accumulated GPP of the four observation sites were 914. 68 g/m2 , 937. 03 g/m2 ,984. 18 g/m2 and 1 002. 20 g/m2 ,respectively.