中文摘要：

人工水库的温室气体释放是全球变化研究的重要热点问题。目前针对不同类型水库的相关研究仍然缺乏足够的案例。为认识河道型水库水气界面CO2释放特征,于2014—2015年在江西省万安水库开展了季节性观测。采用HydroC（TM）/CO2在线系统测定万安水库不同区域水体中pCO2,同时测定了相关水质及气象参数。结果表明,受水体滞留时间较短的影响,万安水库水体没有明显的季节性热分层和化学分层现象。但相比于空间异质性,该水库水质参数的季节性差异更为明显;水气界面的CO2交换通量春季均值为46.00mmol·m（-2）·d（-1）,夏季均值为44.58mmol·m（-2）·d（-1）,秋季均值为57.63mmol·m（-2）·d（-1）,冬季整体最低,均值为17.09mmol·m（-2）·d（-1）。综合相关研究,提出了水库CO2释放的滞留时间模式。

英文摘要：

Green house gases emission from artificial reservoir is a hot spot in current researches on global climate change. However, related studies on the different types of reservoirs are still inadequate. In order to understand characteristics of the CO2 emission from Run-of-the-river reservoir in southern China, a seasonal investigation on the Wan＇an Reservoir in Jiangxi Province was carried out from 2014 to 2015. This study has used an online system （ HydroC TM /CO2 ） to measure pCO2 in water, water quality parameters, and meteorological parameters at various sampling locations in this reservoir. The results show that due to the short time period of water retention, there is no seasonal thermal and chemical stratification in the water column of the Wan＇an Reservoir. However, there are obvious seasonal differences of water quality parameters rather than the spatial heterogeneity; with respective average values of 46.00, 44.58, 57.63, and 17.09 mmol · m-2 · d-1 for the CO2 emission fluxes from water-air interface of the Wan＇an Reservoir in Spring, Summer, Autumn, and Winter, respectively. Based on this study and other reports,a model for retention time of CO2 emission from the reservoir has been proposed.