水口水库与下游闽江河段水-气界面温室气体排放特征及影响因素探究

Greenhouse Gas Emission Characteristics and Infl uencing Factors at the Water-gas Interface in Shuikou Reservoir and the Downstream Minjiang River

为探究水库大坝修建对河流型水库及其下游河段温室气体排放特征的影响,作者于2023年夏(8月)、秋季(11月)对水口水库和下游闽江河段进行温室气体监测。采用薄边界层模型计算温室气体排放通量,N_(2)O排放通量为0.567~1.524μmol·m^(-2)·h^(-1),CO_(2)排放通量为0.793~6.683 mmol·m^(-2)·h^(-1),CH_(4)排放通量为1.495~11.849μmol·m^(-2)·h^(-1)。通过相关性分析筛选出主要影响因子为水温、DO、NH_(3)^(-)N、NO_(3)^(-)N、TN。研究表明大坝拦截对温室气体排放具有一定程度的影响。

In order to investigate the impact of dam construction on the greenhouse gas(GHG)emission characteristics in a river-type res-ervoir and the downstream river reach,the Shuikou Reservoir and downstream Minjiang River was selected as research area.Two field investigations were conducted in the summer and autumn of 2023(i.e.August and November).The thin boundary layer model was used to calculate the emission fluxes of GHG.The results suggested that the GHG emissions of N_(2)O,CO_(2)and CH4 were 0.567~1.524μmol·m^(-2)·h^(-1),0.793~6.683 mmol·m^(-2)·h^(-1)and 1.495~11.849μmol·m^(-2)·h^(-1),respectively.The correlation analysis indicated that the primary influencing factors of the GHG emissions were water temperature,DO,NH_(3)^(-)N,NO_(3)^(-)N,and TN.Additionally,dam interception was found to have a certain degree of impact on GHG emissions.