Partial pressure of CO2 and CO2 outgassing fluxes of Sancha River
QIAN Juan-ting1, WU Qi-xin1, AN Yan-ling1, HOU Yi-liang1, HAN Gui-lin2, TU Cheng-long3
1. Key Laboratory of Karst Environment and Geohazard Prevention, Guizhou University, Guiyang 550003, China;
2. School of Scientific Research, China University Geosciences (Beijing), Beijing 100083, China;
3. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Science, Guiyang 550002, China
In order to understand the distributions and influences pCO2 of in medium and small karstic rivers, the Sancha River was investigated in February and August 2014. The temperature, EC, DO, pH and dissolved inorganic carbon (DIC) of the river were measured and the partial pressure of CO2 (pCO2) was calculated. The results showed that EC、pH、TDS and DIC in dry season were higher than that in wet season. The in the surface water ranged between 300 and 10000μatm, with an average value of 3100μatm. The pCO2 values in the wet season were higher than that in dry season. The analyses of supersaturated CO2 and apparent oxygen utilization demonstrated that pCO2 was controlled by the carbonate system in the dry season. The in-situ aerobic respiration was one of the significantin fluencing factors in the wet season, and the supersaturated CO2 may attribute to the flushing of carbon dioxide from soils. The CO2 emission flux from Sancha River to atmosphere was estimated about 0.9~1.7×109molC/a and 10.8~20.3MgC/(hm2·a). The water-to-air CO2 outgassing flux from Sanchahe River was higher than that from large rivers (i.e. Amazon River、Yangtze River) and lower than that from streams (i.e. Houzhai River、Gäddtjärn River). The results indicated that the CO2 emission fluxes from surface water systems are influenced by the scale of rivers, and the contribution to the regional carbon cycling brought by the medium and small river may be underestimated for a long time.
钱娟婷, 吴起鑫, 安艳玲, 侯祎亮, 韩贵琳, 涂成龙. 三岔河pCO2特征及水-气界面通量分析[J]. 中国环境科学, 2017, 37(6): 2263-2269.
QIAN Juan-ting, WU Qi-xin, AN Yan-ling, HOU Yi-liang, HAN Gui-lin, TU Cheng-long. Partial pressure of CO2 and CO2 outgassing fluxes of Sancha River. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(6): 2263-2269.
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