Journal of Ecology and Rural Environment ›› 2018, Vol. 34 ›› Issue (6): 521-527.doi: 10.11934/j.issn.1673-4831.2018.06.006

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Research of Distribution Characteristics and Influencing Factors of pCO2 in Hong-shui River Longtan Reservoir in Summer

CAO Yu-ping, DENG Fei-yan, JIAO Shu-lin, YUAN Re-lin, ZHANG Qian   

  1. School of Geography and Environmental Science, Guizhou Normal University/Key Laboratory of Remote Sensing Application on Mountain Resources and Environment in Guizhou Province, Guiyang 550001, China
  • Received:2017-09-08 Online:2018-06-25 Published:2018-06-14


For studying the CO2 emissions of Hongshui River Longtan Reservoir, the underway sampling was carried out to continuously survey the Longtan Reservoir of Hongshui River using a professional water sampler in July 2016. The partial pressure of CO2(pCO2) are calculated using the water-chemical balance and the Henry's law. The results show that the data of pCO2 values on the surface water were divided into three intervals because the data of pCO2 values on the surface from near the dam to the middle section ranged from 64.28 to 152.56 Pa, the transition zone of the middle section ranged from 161.57 to 257.57 Pa, as well as inflow waters ranged from 126.45 to 264.29 Pa, which was higher than that of pCO2 before the dam. There was a significant positive correlation on surface water pCO2 with its TDS, Cond and ORP, and a significant negative correlation on surface water pCO2 with pH, which suggests aquatic biosynthesis-respiration, carbonate karst system are important factors affecting the change of reservoir pCO2. Reservoir CO2 flux had a increasing trend from the dam to the end of the tail reservoir with the mean value of the CO2 flux being 45.96 mmol·m-2·d-1 and ranged from 9.06 to 78.80 mmol·m-2·d-1. Reservoir water showed an atmospheric CO2 source with an obvious variation characteristics changing from weak carbon source before the dam to strong carbon source to the upstream, which implies the river type reservoir would slow down the carbon emission of river water.

Key words: Longtan Reservoir, partial pressure of carbon dioxide, the CO2 emission flux, co-relationship analysis

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