中国地理科学(英文版) ›› 2011, Vol. 21 ›› Issue (1): 27-35.

• 论文 • 上一篇    下一篇

Temperature and Soil Moisture Interactively Affect Soil Carbon Mineralization in Zoige Alpine Wetlands

GAO Junqin, OUYANG Hua, LEI Guangchun et al.   

  1. 1. Beijing Forestry University, Beijing 100083, China;2. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
  • 收稿日期:2010-06-01 修回日期:2010-09-05 出版日期:2011-01-15 发布日期:2011-03-02
  • 通讯作者: GAO Junqin E-mail:wg638@163.com
  • 基金资助:

    北京林业大学科技创新项目;中国科学院中乌白专项2010;林业公益性项目

Temperature and Soil Moisture Interactively Affect Soil Carbon Mineralization in Zoige Alpine Wetlands

GAO Junqin, OUYANG Hua, LEI Guangchun et al.   

  1. 1. Beijing Forestry University, Beijing 100083, China;2. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
  • Received:2010-06-01 Revised:2010-09-05 Online:2011-01-15 Published:2011-03-02
  • Supported by:

    ;Special Project of CAS-Russia, Ukraine and Belarus (2010)

摘要:

Wetlands store substantial amount of carbon and may contribute greatly to climate change. However, few studies have investigated the effects of global climate change on carbon mineralization in Zoige wetlands. By measuring CO2 and CH4 production rate from incubated, undisturbed soils, we studied the effects of temperature and soil moisture on carbon mineralization in two types of alpine wetlands (peatland and marsh) on Tibetan plateau. CO2 production rate increased about 3.3~3.7 times with temperatures from 5 oC to 35 oC in marsh soils and 2.4~2.6 times in peat soils, but decreased 5%~45% in marsh soils and 20%~50% in peat soils with soil moistures increasing from non-inundation to inundation. The responses of CO2 production rate to temperatures were more sensitive in marsh soils than in peat soils, but the responses of CH4 production rate were similar. Temperatures played a more important role in CO2 production rate than soil moistures did, while soil moistures played a more important role in CH4 production rate. The Q10 values for CO2 production rate were higher at 5~25℃ than at 25~35℃, implying that carbon mineralization is more sensitive at low temperatures in Tibetan alpine wetlands.

关键词: alpine wetlands, carbon mineralization, marsh, peatland, soil moisture, temperature

Abstract:

Wetlands store substantial amount of carbon and may contribute greatly to climate change. However, few studies have investigated the effects of global climate change on carbon mineralization in Zoige wetlands. By measuring CO2 and CH4 production rate from incubated, undisturbed soils, we studied the effects of temperature and soil moisture on carbon mineralization in two types of alpine wetlands (peatland and marsh) on Tibetan plateau. CO2 production rate increased about 3.3~3.7 times with temperatures from 5 oC to 35 oC in marsh soils and 2.4~2.6 times in peat soils, but decreased 5%~45% in marsh soils and 20%~50% in peat soils with soil moistures increasing from non-inundation to inundation. The responses of CO2 production rate to temperatures were more sensitive in marsh soils than in peat soils, but the responses of CH4 production rate were similar. Temperatures played a more important role in CO2 production rate than soil moistures did, while soil moistures played a more important role in CH4 production rate. The Q10 values for CO2 production rate were higher at 5~25℃ than at 25~35℃, implying that carbon mineralization is more sensitive at low temperatures in Tibetan alpine wetlands.

Key words: alpine wetlands, carbon mineralization, marsh, peatland, soil moisture, temperature