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• 干旱区盐碱土碳过程专栏 • 上一篇    下一篇

盐碱土土壤无机CO2通量与土壤盐碱属性的关系

王忠媛1,2,谢江波1,2,王玉刚1,李彦1**   

  1. 1中国科学院新疆生态与地理研究所, 荒漠与绿洲生态国家重点实验室, 乌鲁木齐 830011; 2中国科学院大学, 北京 100049)
  • 出版日期:2013-10-10 发布日期:2013-10-10

Soil inorganic CO2 flux in relation to soil pH and electric conductivity in saline/alkaline soils.

WANG Zhong-yuan1,2, XIE Jiang-bo1,2, WANG Yu-gang1, LI Yan1**   

  1. (1State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China; 2University of Chinese Academy of Sciences, Beijing 100049, China)
  • Online:2013-10-10 Published:2013-10-10

摘要: 土壤CO2通量是陆地生态系统碳循环的第二大通量,其很小的变化就能严重改变大气CO2浓度的平衡。本研究分析了土壤pH和EC对盐碱土土壤CO2通量的重要组成—土壤无机CO2通量的作用。实验于2010年6—9月在中国科学院新疆阜康荒漠生态站进行。采用高压灭菌的方法,将9种盐碱土的土壤无机CO2通量从土壤CO2通量中分离。结果表明,在土壤类型一定时,土壤无机CO2通量主要受温度控制;低温有利于CO2吸收,高温有利于CO2释放。土壤pH可作为指示盐碱土土壤无机CO2通量作用大小的指标;在低温和高温阶段,土壤pH对土壤无机CO2通量的作用效果不同。土壤盐分较大的变化,才能造成土壤无机CO2通量的显著差异。本研究分析了盐碱土土壤无机CO2通量的特征,为盐碱土无机CO2通量过程机制的推导提供证据。开展不同盐碱土土壤无机CO2通量研究将极大促进干旱区盐碱土碳循环的解读。

关键词: 碳足迹, 辽宁中部城市群, 高分遥感影像

Abstract: Soil CO2 flux is the second largest flux of carbon cycle in terrestrial ecosystems, and its slight variation can result in a significant change in the balance of atmospheric CO2 concentration. This paper analyzed the effects of soil pH and electric conductivity (EC) on the soil inorganic CO2 flux, an important component of soil CO2 flux, in saline/alkaline soils. The experiment was conducted at the Fukang Desert Ecological Station, Xinjiang of Northwest China from June to September, 2010. The inorganic CO2 flux of nine saline/alkaline soils was differentiated from the soil CO2 flux by the method of sterilization with high pressure steam chamber. The results showed that for certain saline/alkaline soil, the soil inorganic CO2 flux was mainly controlled by temperature. Low temperature benefited the CO2 absorption by the saline/alkaline soils, whereas high temperature benefited the CO2 release. The soil pH could be used as a good indicator for the soil inorganic CO2 flux. At low and high temperatures, the effects of the soil pH on the soil inorganic CO2 flux differed. The soil salinity also had effects on the soil inorganic CO2 flux, but the effects could be significant only when the soil salinity had a considerable change. This study highlighted the characteristics of soil inorganic CO2 flux in saline/alkaline soils, which could provide evidence to educe the underlying inorganic mechanisms. The nonnegligible role of soil inorganic CO2 flux requires further investigation towards a better understanding of soil carbon cycle in saline/alkaline soils in arid lands.

Key words: carbon footprint, high resolution remote sensing, agglomeration., central Liaoning