| 三峡库区香溪河秋末至中冬CO2和CH4分压特征分析 |
| 摘要点击 3639 全文点击 1248 投稿时间：2015-10-29 修订日期：2016-04-06 |
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| 中文关键词 溶解气体 分压 环境因子 三峡水库 香溪河库湾 |
| 英文关键词 dissolved gas partial pressure environmental factors the Three Gorges Reservoir Xiangxi River Bay |
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| 中文摘要 |
| 为揭示三峡库区支流库湾表层水体秋末至中冬CH4和CO2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CH4和CO2的浓度，通过亨利定律计算CH4和CO2的分压，并同步监测相关环境因子. 结果表明，表层水体CH4分压变化范围0.64~4.43 Pa，平均值为（1.69±0.94）Pa，CO2分压变化范围49.90~868.91 Pa，平均值为（328.48±251.63）Pa. 水体CO2和CH4分压的变化呈显著负相关（r=-0.618，P<0.01），pCH4和pCO2与溶解氧、总磷、叶绿素a、pH水温和水位相关性明显，其中pCO2与各环境因子的相关性较pCH4更为密切. |
| 英文摘要 |
| The Concentrations of dissolved CH4 and CO2 in 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 CH4 and CO2 were calculated according to the Henry's law. Their temporal variation and the effects of environmental parameters were also discussed. The results indicated that the CH4 partial pressure in the surface water ranged 0.64-4.43Pa, with an average of (1.69±0.94)Pa. The CO2 partial pressure varied from 49.90 to 868.91Pa, with the average of (328.48±251.63)Pa. The pCO2 and pCH4 had a strong negative correlation (r=-0.618,P<0.01). During the period of monitoring, the pCO2 and pCH4 in surface water were significantly correlated with pH, DO, chlorophyll a, TP, surface water temperature and water level. Compared with pCH4, pCO2 was more closely correlated with various environmental factors. |
