• 责任者：Zhou Xiaoping (School of Geographical Sciences ; Southwest University ; Chongqing 400715 ; China) ; Lan Jiacheng
• 刊名：Acta Sedimentologica Sinica
• 出版年：2013
• 卷期：31(6)
• 关键词：岩溶环境 ; karst environment ; 碳酸钙 ; calcium carbonate ; 重庆 ; Chongqing
• 页码：p.1014-1021
• 图表：9 illus., 28 refs.
• 分类号：0803
• issnNo：ISSN1000-0550
• isbnNo：CN62-1038/P

     PH, conductivity, dissolved oxygen and concentration of HCO3- , Ca2＋ , as well as other anion and cation, was monitored by certain space to explain the evolution of stream water chemistry along the flow path of Baishuwan Spring downstream in Nanchuan, Chongqing, China. After surfacing, stream water chemistry was changed regularly by CO2 outgassing, water became increasingly supersaturated with calcium carbonate and the obviously precipitation occurred. The result shows that, concentration of I-ICO3- ,Ca2＋ , conductivity（EC） and CO2 partial pressure declined along the flow path, caused by CO2 outgassing, while pH value and saturation index of common carbonate minerals in- creased. The concentration gradient between atmosphere and water is the main factor affecting the degassing rate, while the creek drainage gradient also has a certain influence. Extent of degassing at the spring vent is decisive factors controlling the carbonate deposition along the flow path. The small flow during dry season, a great degree of degas sing, high level of Ca2 ＋ concentration, and the hydraulic disturbance which accelerates CO2 outgassing, as well as the physical adsorption of litter and other substances in the creek drainage, factors above all play active role in deposition of calcium carbonate.