Impacts of anthropogenic activities on weathering and carbon fluxes: a case study in the Xijiang River basin, southwest China

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• 作者：Shi Yu ; Shiyi He ; Ping'an Sun ; Junbing Pu ; Jie Huang…
• 关键词：Anthropogenic activities ; Rock weathering ; DICcarbonate acid ; DICnitric acid + sulfuric acid ; Net carbon sink
• 刊名：Environmental Earth Sciences
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：75
• 期：7
• 全文大小：1,650 KB
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• 作者单位：Shi Yu (1) (2)
  Shiyi He (2)
  Ping’an Sun (2)
  Junbing Pu (2)
  Jie Huang (3)
  Huixian Luo (3)
  Yongshan Li (4)
  Rui Li (5)
  Yaqiong Yuan (5)
  
  1. School of Environmental Studies, China University of Geosciences, Wuhan, 430074, China
  2. Karst Dynamics Laboratory, Ministry of Land and Resources/GuangXi, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin, China
  3. Wuzhou Bureau of Hydrology and Water Resources, Wuzhou, 543000, China
  4. Guilin Environment Protection Monitoring Station, Guilin, 541004, China
  5. School of Geography Sciences, Southwest University, Chongqing, 400715, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：None Assigned
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-6299

文摘

Monthly hydrogeochemical and discharge values were collected in the middle and upper reaches of the Xijiang River basin from April 2011 to March 2012 for the purpose of assessing the impact of anthropogenic activities on geological carbon sinks. The results of this study show that (1) the main ions in river water were influenced by different natural conditions and anthropogenic activities; (2) in a hydrological year, weathering fluxes of dissolved inorganic carbon (DIC) were 50.00 × 108, 1.52 × 108, and 1.79 × 108 kg CO₂ in the Wuzhou, Zhaoping, and Yangshuo transects, respectively; and furthermore, DIC_{carbonate acid} (carbon flux caused by carbonic acid) were 37.71 × 108, 1.31 × 108, and 1.56 × 108 kg CO₂, respectively, which represents approximately 31.56, 10.15, and 15.29 g CO₂ m−2 in the monitoring period; (3) the carbon flux from the participation of allogenic acid (such as sulfuric acid or nitric acid) in carbonate rock weathering was obvious, which must be eliminated from the calculation of the net carbon sink in carbonate rock weathering because it would be released into the atmosphere as a carbon source; and (4) in the geological processes, there was a clearly carbon sink loss caused by anthropogenic activities in various ways, which is attributed to the addition of nitric acid and sulfuric acid, such as through agricultural and industrial activities, and hydropower stations.