Release of Carbon and Nitrogen from Alpine Soils During Thawing Periods in the Eastern Qinghai-Tibet Plateau

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• 作者：Yongheng Gao ; Xiaoyang Zeng ; Qingyan Xie ; Xingxing Ma
• 关键词：Freezing–thaw ; Soil carbon ; Nitrogen availability ; Alpine peatland ; Climate change
• 刊名：Water, Air, and Soil Pollution
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：226
• 期：7
• 全文大小：754 KB
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• 作者单位：Yongheng Gao (1)
  Xiaoyang Zeng (2)
  Qingyan Xie (1)
  Xingxing Ma (1)
  
  1. Key Laboratory of Mountain Environment Evolution and Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, China
  2. Department of Landscape Architecture, Sichuan College of Architectural Technology, Deyang, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environment
  Atmospheric Protection, Air Quality Control and Air Pollution
  Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
  Terrestrial Pollution
  Hydrogeology
  
• 出版者：Springer Netherlands
• ISSN：1573-2932

文摘

Soil thawing can affect the turnover of soil carbon (C) and nitrogen (N) and their release into the atmosphere. However, little has been known about the release of C and N during the thawing of alpine soils in the Qinghai-Tibet Plateau. This study investigated the effects of soil thawing on the release of CO₂, CH₄, and N₂O from alpine peatland soils and alpine meadow soils through an indoor experiment and determined the changes in the dissolved organic C (DOC), dissolved organic N (DON), NO₃ −-N, NH₄ +-N, and NO₂ −-N concentrations in the soils after soil thawing. The freeze–thaw treatments were performed by incubating the soil columns at mild (−5 °C) and severe (−15 °C) for 14 days, and then at 5 °C for 18 days. The control columns were incubated at 5 °C. During thawing, the cumulative CO₂ emissions from the severely frozen alpine peatland soils and alpine meadow soils were 36 and 85 % higher than those from the control soils, and the cumulative N₂O emissions were 3.9 and 5.8 times higher than those from the control soils. However, the thawing after mild freezing produced no significant effects. The two freezing temperatures significantly increased the release of CH₄ from the alpine peatland soils, but the thawing of the severely frozen soils reduced the CH₄ uptake of the alpine meadow soils by 27 %. After the severely frozen alpine peatland soils thawed, the concentrations of DOC, DON, NO₃ −-N, NH₄ +-N, and NO₂ −-N increased significantly, but NO₂ −-N showed no significant changes for the alpine meadow soils. After thawing with mild freezing, DOC in the alpine peatland soils and NH₄ +-N, NO₂ −-N, and DOC in the alpine meadow soils showed no significant changes. This study indicates that the potential for release of C and N from alpine soils during thawing periods strongly depends on the freezing temperature and soil types.