三峡库区香溪河秋末至中冬CO_2和CH_4分压特征分析  

Partial Pressure of Carbon Dioxide and Methane from Autumn to Winter in Xiangxi Bay of the Three Gorges Reservoir

作　　者：张军伟[1] 雷丹[1] 肖尚斌[1] 张成[2] 穆晓辉[1] 刘佳[1] 李迎晨[1] 

机构地区：[1]三峡大学水利与环境学院,宜昌443002 [2]三峡大学电气与新能源学院,宜昌443002

出　　处：《环境科学》2016年第8期2924-2931,共8页Environmental Science

基　　金：国家自然科学基金项目(41273110);湖北省自然科学基金项目(2014CFB672;2015CFC834)

摘　　要：为揭示三峡库区支流库湾表层水体秋末至中冬CH_4和CO_2的分压特征及其影响因素,于2014年相应时间段在香溪河库湾每天定点定时采取表层水样,利用顶空气相色谱技术测定水中溶解CH_4和CO_2的浓度,通过亨利定律计算CH_4和CO_2的分压,并同步监测相关环境因子.结果表明,表层水体CH_4分压变化范围0.64~4.43 Pa,平均值为（1.69±0.94）Pa,CO_2分压变化范围49.90~868.91 Pa,平均值为（328.48±251.63）Pa.水体CO_2和CH_4分压的变化呈显著负相关（r=-0.618,P〈0.01）,p CH_4和p CO_2与溶解氧、总磷、叶绿素a、p H水温和水位相关性明显,其中p CO_2与各环境因子的相关性较p CH_4更为密切.The Concentrations of dissolved CH_4 and CO_2in Xiangxi Bay of the Three Gorges Reservoir from autumn to winter in 2014 were determined with headspace gas chromatography technology. Then their partial pressures of CH_4 and CO_2were calculated according to the Henry＇s law. Their temporal variation and the effects of environmental parameters were also discussed. The results indicated that the CH_4 partial pressure in the surface water ranged 0. 64-4. 43 Pa,with an average of（ 1. 69 ± 0. 94） Pa. The CO_2 partial pressure varied from 49. 90 to 868. 91 Pa,with the average of（ 328. 48 ± 251. 63） Pa. The p CO_2 and p CH_4 had a strong negative correlation（ r =- 0. 618,P 0. 01）. During the period of monitoring,the p CO_2 and p CH_4 in surface water were significantly correlated with p H,DO,chlorophyll a,TP,surface water temperature and water level. Compared with p CH_4,p CO_2 was more closely correlated with various environmental factors.

关 键 词：溶解气体 分压 环境因子 三峡水库 香溪河库湾 

分 类 号：X144[环境科学与工程—环境科学]