The response of soil CO₂ efflux to desertification on alpine meadow in the Qinghai鈥揟ibet Plateau

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• 作者：Fang Zhang (1) zhangfang2003_2006@163.com
  Tao Wang (1) wangtao@lzb.ac.cn
  Xian Xue (1)
  Bangshuai Han (2)
  Fei Peng (1)
  Quangang You (1)
• 关键词：Qinghai– ; Tibet Plateau ; Soil CO2 efflux ; Environmental factors ; Desertification
• 刊名：Environmental Earth Sciences
• 出版时间：March 2010
• 出版年：2010
• 期刊代码：67_1866-6299
• 类别：ear
• 卷：60
• 期：2
• 页码：349-358
• 数据来源：sp

摘要

Assessing the global C budget requires a better understanding of the effect of environmental factors on soil CO₂ efflux from both experiments and theoretical research, especially in different desertified lands in the Qinghai–Tibet Plateau. Based on the enclosed chamber method, soil CO₂ efflux in four different desertified lands and one control [alpine meadow (AM)] were measured in June, August and September, 2008, respectively. Soil CO₂ efflux rates at the top, the middle, the bottom of a slope and the flat in front of the slope were obtained at Maduo County. The results showed that average daily soil CO₂ efflux rates were 3.72, 2.65, 2.68, 0.59 and 0.37 g m−2 day−1 in the AM, lightly (LDL), moderately (MDL), severely (SDL) and very severely desertified lands (VSDL) during the growing season, respectively. Soil CO₂ efflux decreased with the change of desertification. The response of soil CO₂ efflux to environmental factors was adequately described by the linear model; models accounted for 76, 65, 72, 59 and 71%of the variability on soil CO₂ efflux in the AM, LDL, MDL, SDL and VSDL, respectively. Any environmental factor, however, was insufficient to explain the soil CO₂ efflux; the common influence could perfectly reflect soil CO₂ efflux response to the desertification change.