摘要
于2011年11月至2012年10月在黄河小浪底站和花园口站进行连续采样分析,根据亨利定律计算出表层水体二氧化碳分压(p CO2),研究了在小浪底水库'水沙调控'的影响下黄河花园口站和小浪底站表层水体p CO2特征及水-气CO2通量.结果表明,在小浪底水库正常调度期间,小浪底站表层水体p CO2在82~195 Pa之间,花园口站表层水体p CO2在99~228 Pa之间,且花园口站表层水体p CO2均高于同期的小浪底站;在小浪底水库调水调沙期间,两个水文站均表现为水库泄水期间的表层水体p CO2明显低于水库排沙期间的表层水体p CO2.无论是在小浪底水库正常调度期间还是在调水调沙期间,两个水文站表层水体p CO2均与DIC含量呈现显著的正相关关系.8、9月Ep CO2/AOU的比值高于生物好氧呼吸作用控制水体p CO2的理论下限0.62,因此8、9月生物好氧呼吸作用对水体p CO2的贡献比较明显.从全年来看小浪底站和花园口站平均水-气CO2扩散通量分别为0.486μmol·(m2·s)-1和0.588μmol·(m2·s)-1;在水库正常调度期间花园口站水-气CO2扩散通量明显高于同期的小浪底站;在小浪底水库调水调沙期间两个水文站均表现为水库泄水期间的水-气CO2扩散通量明显低于水库排沙期间的水-气CO2扩散通量.
According to periodic sampling analysis per month in Xiaolangdi station and Huayuankou station from November 2011 to October 2012,combined with continuous sampling analysis of Xiaolangdi Reservoir during runoff and sediment control period in 2012,partial pressure of CO2( p CO2) in surface water were calculated based on Henry’s Law,p CO2 features and air-water CO2 degassing fluxes of Huayuankou station and Xiaolangdi station affected by Xiaolangdi Reservoir were studied. The results were listed as follows,when Xiaolangdi Reservoir operated normally,p CO2 in surface water of Xiaolangdi station and Huayuankou station varied from 82 to195 Pa and from 99 to 228 Pa,moreover,p CO2 in surface water from July to September were distinctly higher than those in other months; meanwhile,p CO2 in surface water from Huayuankou station were higher than that from Xiaolangdi station. During runoff and sediment control period of Xiaolangdi Reservoir,two hydrological stations commonly indicated that p CO2 in surface water during water draining were obviously lower than those during sediment releasing. Whether in the period of normal operation or runoff and sediment control,p CO2 in surface water had positive relations to DIC content in two hydrological stations. Since the Ep CO2/ AOU value was higher than the theoretical value of 0. 62,the biological aerobic respiration effect had distinct contribution to p CO2. Throughout the whole year,air-water CO2 degassing fluxes from Xiaolangdi station and Huayuankou station were 0. 486 μmol·( m2·s)-1and 0. 588μmol·( m2·s)-1respectively; When Xiaolangdi Reservoir operated normally,air-water CO2 degassing fluxes in Huayuankou station were higher than that in Xiaolangdi station; during runoff and sediment control from Xiaolangdi Reservoir,two hydrological stations had one observation result in common,namely,air-water CO2 degassing fluxes in the period of water draining were obviously lower than that in the period of sediment releasing.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2015年第1期40-48,共9页
Environmental Science
基金
国家自然科学基金项目(41001119)
关键词
黄河
二氧化碳分压
水-气CO2扩散通量
调水调沙
小浪底水库
Yellow River
partial pressure of CO2(pCO2)
air-water CO2 degassing fluxes
runoff and sediment control
Xiaolangdi Reservoir
