红枫湖夏季分层期间pCO<sub>2</sub>分布规律的研究

吕迎春; 刘丛强; 王仕禄; 徐刚

红枫湖夏季分层期间pCO₂分布规律的研究

1.
中国科学院地球化学研究所环境地球化学国家重点实验室, 贵州, 贵阳, 550002;
2.
中国科学院研究生院, 北京, 100039

基金项目: 国家自然科学基金重点资助项目(90610037);国家重点基础研究发展计划(973)资助项目(2006CB403200)

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作者简介:
吕迎春(1979- ),女,山东海阳人,博士研究生,主要从事湖泊中碳、氮的生物地球化学研究.E-mail:lyingchun2000@hotmail.com

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出版历程
- 收稿日期: 2007-04-23
- 刊出日期: 2008-01-24

Distribution of pCO₂ in Hongfeng lake in summer stratification

1.
State Key Laboratory of the Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;
2.
Graduate University of Chinese Academy of Sciences, Beijing 100039, China

Funds: The study is financially supported by the National Natural Science Foundation of China (No.90610037) and the National Basic Research Program of China (2006CB403200)

摘要

摘要: 在夏季分层期间对红枫湖南、北湖湖心的水样进行分层采集,同时测定了分层水样的温度、pH、HCO₃^-浓度、溶解氧(DO)、叶绿素a(Chl-a)及铵根离子(NH₄⁺)、硝酸根离子(NO₃^-)、磷酸根离子(PO₄^3-)的浓度,水体中CO₂的分压(pCO₂)由化学平衡及亨利定律求得。研究结果表明:光合作用、有机质降解及水体热分层是影响红枫湖夏季pCO₂分布的主要因素。其中,温水层CO₂欠饱和是光合作用吸收CO₂引起的,温跃层中pCO₂的急剧增加是光合产物降解产生CO₂引起的。静水层沉积物附近pCO₂最高并且还有持续增加的趋势,说明沉积物中有机质降解是静水层中CO₂增加的主要原因,夏季湖底水温较高加快了沉积物中有机质的降解。分层现象使pCO₂在水体中的分布差别明显,并且使静水层中CO₂得到积累。此外,夏季红枫湖水体中pCO₂的变化与NH₄⁺、PO₄^3-的变化密不可分,表现为温水层中光合作用消耗NH₄⁺、PO₄^3-,有机质降解过程伴随NH₄⁺、PO₄^3-的释放。
- CO₂ /
- 分层 /
- 光合作用 /
- 有机质降解 /
- 沉积物
Abstract: Water column samples taken from the northern and the southern lake centers in Hongfeng lake in summer stratification were measured about their water temperature,pH,the concentration of HCO₃^-,DO,Chla,NH₄⁺,NO₃^-,and PO₄^3-.The pressure of CO₂ (pCO₂) was calculated by the chemical balance and the Henry's law.The results show that the photosynthesis,the degradation of the organic matter and the thermal stratification are the main factors regulating the distribution of pCO₂ in Hongfeng lake.The unsaturation of CO₂ in the epilimnion is caused by the fixation of CO₂ during the photosynthesis and the sharp increase of CO₂ in the metalimnion may be due to the degradation of the photosynthesis production.In addition,the pCO₂ in the hypolimnion near the sediment is the highest and has an increasing tendency,which indicates that the degradation of organic matter in the sediments has an important effect on the pCO₂ in the hypolimnion.The thermal stratification results in the significant variation of pCO₂ in the water column and the accumulation of CO₂ in the hypolimnion.Finally,the variation of pCO₂ is concomitant with the variation of the nutriments:the consumption of nutriments during the photosynthesis took place in the upper water column and the release of nutriments during the degradation of the organic matter in the lower water column.
- CO₂ /
- stratification /
- photosynthesis /
- degradation /
- sediment

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参考文献(19)

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红枫湖夏季分层期间pCO2分布规律的研究

作者简介: 吕迎春(1979- ),女,山东海阳人,博士研究生,主要从事湖泊中碳、氮的生物地球化学研究.E-mail:lyingchun2000@hotmail.com

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Distribution of pCO2 in Hongfeng lake in summer stratification

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红枫湖夏季分层期间pCO₂分布规律的研究

作者简介:
吕迎春(1979- ),女,山东海阳人,博士研究生,主要从事湖泊中碳、氮的生物地球化学研究.E-mail:lyingchun2000@hotmail.com

Distribution of pCO₂ in Hongfeng lake in summer stratification