• 全国中文核心期刊
  • 中国科技核心期刊
  • 美国工程索引(EI)收录期刊
LÜ Ying-chun, LIU Cong-qiang, WANG Shi-lu, XU Gang. Distribution of pCO2 in Hongfeng lake in summer stratification[J]. Advances in Water Science, 2008, 19(1): 106-110.
Citation: LÜ Ying-chun, LIU Cong-qiang, WANG Shi-lu, XU Gang. Distribution of pCO2 in Hongfeng lake in summer stratification[J]. Advances in Water Science, 2008, 19(1): 106-110.

Distribution of pCO2 in Hongfeng lake in summer stratification

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)
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  • Received Date: April 23, 2007
  • 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 PO43-.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.
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