| 盐土和碱土土壤无机CO2通量的分离 |
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| 引用本文： | 王忠媛,王玉刚,谢江波,李彦.盐土和碱土土壤无机CO2通量的分离[J].干旱区地理,2013,36(4):655-661. |
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| 作者姓名： | 王忠媛 王玉刚 谢江波 李彦 |
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| 作者单位： | 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， 新疆 乌鲁木齐 830011；2 中国科学院大学， 北京 100049 |
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| 基金项目： | 国家重点基础研究发展计划973项目（2009CB825102）；国家国际科技合作计划“（2010DFA92720-05）” |
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| 摘 要： | 干旱区盐碱土无机CO2通量是一个崭新、独特的科学现象，打破了土壤CO2通量完全来自于有机源的假设；然而，盐碱土无机CO2通量在土壤CO2通量和全球碳循环中的重要性还缺乏分离和量化的依据，因而存在很大的不确定性。通过采用高压灭菌的方法，将盐土和碱土的土壤无机CO2通量从土壤CO2通量中分离。结果表明：高压灭菌方法并不改变土壤的理化性质，并通过土壤有机CO2通量与温度的关系验证了分离方法的有效性，从而为盐碱土无机CO2通量的分离、量化和评估提供了一个可靠有效的方法。盐碱土的土壤无机CO2通量是土壤CO2通量的重要组分，土壤无机CO2通量的分离对精确解析干旱区盐碱土生态系统的碳循环是必要的；对盐碱土土壤无机CO2通量的研究，将促进对干旱区盐碱土土壤CO2通量和全球碳循环的理解。
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| 关 键 词： | 土壤CO2通量 土壤无机CO2通量 盐土 碱土 高压灭菌 |
| 收稿时间： | 2012-11-28 |
Differentiating the soil inorganic CO2 flux of saline and alkaline soils |
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| WANG Zhong-yuan,WANG Yu-gang,XIE Jiang-bo,LI Yan.Differentiating the soil inorganic CO2 flux of saline and alkaline soils[J].Arid Land Geography,2013,36(4):655-661. |
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| Authors: | WANG Zhong-yuan WANG Yu-gang XIE Jiang-bo LI Yan |
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| Affiliation: | 1 State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011,Xinjiang, China; 2 University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | The soil inorganic CO2 flux in saline/alkaline soil of the arid land is a unique and brand-new phenomenon，which breaks the assumption that soil CO2 fluxes are purely organic in origin. However，due to lack differentiation standard and quantitative data，the significance of soil inorganic CO2 flux to soil CO2 flux and global carbon cycle is still uncertainty. The experiment was carried out from August to October in 2009 at the Fukang Station of Desert Ecology. To determine the potential contribution of soil inorganic CO2 flux to total soil CO2 flux，the soil inorganic CO2 flux was differentiated by sterilization treatment（121 ℃，24 h） with pressure steam chamber. The results showed that soil properties had little change before and after sterilization treatment. Having its differentiation effect validated by the relationship between soil organic CO2 flux and temperature, it showed that the sterilization was a reliable and valid method to differentiate soil inorganic CO2 flux. The effect of soil inorganic CO2 flux was larger than that of soil organic CO2 flux，which could dominate the saline/alkaline soil CO2 flux both in direction and magnitude. As a significant component of soil CO2 flux in saline/alkaline soil，the differentiation and quantification of soil inorganic CO2 flux are necessary to advance understanding of carbon cycle in arid land. Therefore, the non-negligible role of soil inorganic CO2 flux as potential contribution to the arid land ecosystem carbon cycle requires further investigation towards a better understanding of arid land soil CO2 flux and global soil carbon cycle. |
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| Keywords: | soil CO2 flux oil inorganic CO2 flux saline soil alkaline soil pressure-steaming sterilization |
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