Three-dimensional fluorescence spectral characteristics of dissolved organic carbon in cave drip waters and their responses to environment changes: Four cave systems as an example in Guizhou Province, China

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• 作者：XingNeng Xie (1) (2)
  ShiJie Wang (1)
  YunChao Zhou (3)
  WeiJun Luo (1) (2)
  
• 关键词：cave drip water ; three ; dimensional fluorescence spectral characteristics ; fulvic ; like fluorescence ; vegetation type ; soil layer type
• 刊名：Chinese Science Bulletin
• 出版年：2008
• 出版时间：March 2008
• 年：2008
• 卷：53
• 期：6
• 页码：884-889
• 全文大小：1368KB
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• 作者单位：XingNeng Xie (1) (2)
  ShiJie Wang (1)
  YunChao Zhou (3)
  WeiJun Luo (1) (2)
  
  1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China
  2. Graduate University of the Chinese Academy of Sciences, Beijing, 100049, China
  3. Forestry College of Guizhou University, Guiyang, 550025, China
  
• ISSN：1861-9541

文摘

Understanding the responses of fluorescence spectral characteristics of cave drip waters to modern environment and climate changes is key to the reconstructions of environmental and climatic changes using fluorescence spectral characteristics of speleothems. The fluorescence spectral characteristics of dissolved organic carbon (DOC) in four active cave systems were analyzed with a three-dimensional (3D) fluorescence spectral analysis method. We found that the fluorescence types of DOC were mainly of fulvic-like and protein-like fluorescences, both in soil waters and cave drip waters. The intensity of fulvic-like fluorescence was positively correlated with the concentrations of DOC, suggesting that the DOC of cave drip waters was derived from the overlying soil layer of a cave system. Compared with the other cave systems, the variation range of the excitation and emission wavelengths for fulvic-like fluorescence of cave drip waters in Liangfeng cave system that had forest vegetation was smaller and the excitation wavelength was longer, while its fluorescence intensity varied significantly. By contrast, the excitation and emission wavelengths and fluorescence intensity for that in Jiangjun cave system that had a scrub and tussock vegetation showed the most significant variation, while its excitation wavelength was shorter. This implies that the variation of vegetation overlying a cave appears to be a factor affecting the fluorescence spectral characteristics of cave drip waters.