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《Environmental Science & Technology》 2018-06
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Distribution Characteristics of Partial Pressure of Carbon Dioxide during Thermal Stratification in Summer in Guangzhao Reservoir

CAO Yuping;YUAN Relin;JIAO Shulin;ZHANG Qian;DENG Feiyan;School of Geography and Environmental Science,Guizhou Normal University;Key Laboratory of Remote Sensing Application on Mountain Resources and Environment in Guizhou Province;  
In order to understand the distribution of partial pressure of carbon dioxide(pCO_2)in the newly built reservoir,water samples were taken by continuous navigation observation and stratified sampling to determine their main physical and chemical parameters and nutrients concentration of NH_4~+-N,NO_3~--N,PO_4~(3-)-P at karst area reservoir of Guangzhao in September 2016.The partial pressure of CO_2 was calculated using the chemical balance and the Henry's law.The results showed that the water temperature occurred obviously to thermal stratification with three layers including the surface layer(0~10 m),the thermocline layer(10~30 m)as well as the bottom layer(30 m).The values of partial pressure of carbon dioxide in surfer ranged from 125.30 to 179.35 Pa,with the mean values of 147.11 Pa.The values of pCO_2 in the Reservoir was lower than the average values in the world which acted as the source of atmospheric carbon dioxide.In the vertical,the pCO_2increased with water depth and the maximum value occurred at the bottom of the Reservoir.The pCO_2 was significant negative correlated with temperature(T),pH,NH_4~+-N and was positive correlated with total dissolved solids(TDS)and alkalinity(ALK).Photosynthesis and respiration of aquatic organisms as well as the carbonate system were the main mechanisms influencing the control of pCO_2 in the Reservoir.
【Fund】: 国家自然科学基金项目(41263011);; 贵州省科学技术基金(黔科合计省合[2012]7005号)
【CateGory Index】: X171;X511
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