长江流域资源与环境 >> 2020, Vol. 29 >> Issue (4): 964-973.doi: 10.11870/cjlyzyyhj202004017

• 生态环境 • 上一篇    下一篇

桂林毛村地下河水-气界面CO2通量的变化特征及其影响因素

王修华1,2,吴夏1*,黄芬1,曹建华1,胡晓农2


  

  1. (1. 中国地质科学院岩溶地质研究所/自然资源部、广西岩溶动力学重点实验室,广西 桂林 541004;2.中国地质大学(北京),北京 100083)
  • 出版日期:2020-04-20 发布日期:2020-06-12

Spatial Variations of CO2 Degassing Across Water-air Interface and Its Impact Factors in Maocun Groundwater River Outlet, Guilin

WANG Xiu-hua1,2,WU Xia1, HUANG Fen1,CAO Jian-hua1, HU Xiao-nong2   

  1. (1. Key Laboratory of Karst Dynamics,Ministry of Land and Resources & Guangxi, Guilin 541004,China;2. China University of Geosciences, Beijing 10083, China)

  • Online:2020-04-20 Published:2020-06-12

摘要: 摘要: 为揭示不同时间尺度下岩溶区地下河出口CO2通量的变化特征及其影响因素,本研究采用静态浮游箱-气相色谱法对毛村地下河出口水-气界面CO2交换通量开展季节性和连续48小时昼夜监测。结果显示:水-气界面CO2交换通量具有明显的季节性和昼夜变化特征,并且均表现为由水体向大气释放CO2,呈现出大气CO2源的特征。在季节性尺度上,CO2交换通量的变化范围为90.27~406.32 mg·(m2·h)-1,平均值为253.50 mg·(m2·h)-1。CO2交换通量的季节性特征表现为雨季大于旱季。在昼夜尺度上,CO2交换通量的变化范围为46.8~244.45 mg·(m2·h)-1,平均值为137.81 mg·(m2·h)-1。CO2交换通量的昼夜性特征表现夜晚大于白天,最高值出现在凌晨0∶00和1∶00,最低值出现在下午14∶00和15∶00。由于毛村地下河出口水-气界面CO2交换通量受到诸多因素的影响。通过相关分析表明,毛村地下河出口水-气界面CO2交换通量在季节性尺度下的主控因素为岩溶水体中碳酸的平衡系统,但是在昼夜尺度下的主控因素为局地区域环境参数。


Abstract: Abstract:In order to reveal the variation characteristics and influencing factors of CO2 degassing across water-air interface in karst underground river at different time scales. This study used the floating chamber- gas chromatography to monitored seasonal variation and diurnal variation of CO2 exchange flux at the water-gas interface in Maocun, Guilin. The results were as follows: CO2 exchange flux at the water-gas interface has obvious seasonal and diurnal variation characteristics. In addition, CO2 is released into the atmosphere by karst underground River, which is the characteristic of atmospheric CO2 source. On the seasonal scale, CO2 exchange flux varies from 90.27 mg·(m2·h)-1 to 406.32 mg·(m2·h)-1, with an average value of 253.50 mg·(m2·h)-1. The seasonal characteristics of CO2 exchange flux are higher in rainy season than dry season. On the diurnal variation monitoring scale, CO2 exchange flux varies from 46.8 mg·(m2·h)-1 to 244.45 mg·(m2·h)-1, with an average value of 137.81 mg·(m2·h)-1.CO2 exchange flux at night was significantly higher than day, the highest value appeared at 0∶00 and 1∶00 in the morning, and the lowest value appeared at 14∶00 and 15∶00 in the afternoon. The CO2 exchange flux at the water-gas interface was affected by many factors. The correlation analysis shows that the main controlling factor of CO2 exchange flux is the carbonate equilibrium system of Maocun underground river outlet at the seasonal scale, but the main controlling factor was the local regional environmental parameter at the diurnal scale.

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