Cover Image

Dissolved organic carbon, CO2, and CH4 concentrations and their stable isotope ratios in thermokarst lakes on the Qinghai-Tibetan Plateau

Cuicui Mu, Tingjun Zhang, Qingbai Wu, Xiaoqing Peng, Peng Zhang, Yuzhong Yang, Yandong Hou, Xiankang Zhang, Guodong Cheng
  • Tingjun Zhang
    Lanzhou University, China
  • Qingbai Wu
    Chinese Academy of Sciences, China
  • Xiaoqing Peng
    Lanzhou University, China
  • Peng Zhang
    Chinese Academy of Sciences, China
  • Yuzhong Yang
    Chinese Academy of Sciences, China
  • Yandong Hou
    Chinese Academy of Sciences, China
  • Xiankang Zhang
    Lanzhou University, China
  • Guodong Cheng
    Chinese Academy of Sciences, China

Abstract

Thermokarst lakes are widely distributed on the Qinghai-Tibetan Plateau (QTP), which accounts for 8% of the global permafrost area. These lakes probably promote organic matter biodegradation and thus accelerate the emission of carbon-based greenhouse gases. However, little is known about greenhouse gas concentrations and their stable isotopes characteristics of these lakes. In this study, we measured the concentrations of dissolved organic carbon (DOC), dissolved CO2 and CH4, as well as the distribution of δ13CCO2, δ13CCH4, and δ13COM (organic matter) of lake sediments in thermokarst lakes on the QTP. Results showed that the OM of the lake sediments was highly decomposed. The concentrations of DOC, CO2 and CH4 in the lake water on the QTP were 1.2–49.6 mg L–1, 3.6–45.0 μmol L–1 and 0.28–3.0 μmol L–1, respectively. The highest CO2 and CH4 concentrations were recorded in July while the lowest values in September, which suggested that temperature had an effect on greenhouse gas production, although this pattern may also relate to thermal stratification of the water column. The results implied that thermokast lakes should be paid more attention to regarding carbon cycle and greenhouse gas emissions on the QTP.

Keywords

Qinghai-Tibetan Plateau; thermokarst lakes; greenhouse gas; dissolved organic carbon; stable carbon isotope.

Full Text

PDF
HTML
Submitted: 2015-09-29 18:01:57
Published: 2016-01-26 00:00:00
Search for citations in Google Scholar
Related articles: Google Scholar
Abstract views:
1157

Views:
PDF
457
HTML
120

Article Metrics

Metrics Loading ...

Metrics powered by PLOS ALM


Copyright (c) 2016 Cuicui Mu, Tingjun Zhang, Qingbai Wu, Xiaoqing Peng, Peng Zhang, Yuzhong Yang, Yandong Hou, Xiankang Zhang, Guodong Cheng

Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
 
© PAGEPress 2008-2017     -     PAGEPress is a registered trademark property of PAGEPress srl, Italy.     -     VAT: IT02125780185