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地球科学进展  2006, Vol. 21 Issue (9): 973-981    DOI: 10.11867/j.issn.1001-8166.2006.09.0973
中国农业大学资源与环境学院土壤与水农业部重点实验室,土壤植物相互作用教育部重点实验室,北京 100094
Modeling and Application of Stable Carbon Isotope of Pedogenic Carbonate
Yang Lifang,Li Guitong,Li Baoguo
Key Laboratory of Soil Science and Water, Ministry of Agriculture, Key Laboratory of Soil-Plant Interaction,Ministry of Education, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100094,China
 全文: PDF(163 KB)  


关键词: 扩散—生成模型土壤发生性碳酸盐土壤CO2δ13C值分馏模型    

In arid and semiarid zones, soil inorganic carbon pool is about 2-5 times more than soil organic carbon pool. For these regions, size and turnover of soil inorganic carbon pool play important role in soil carbon balance. Pedogenic carbonate is product of soil genesis process. It is closely related with the solution/deposition balance of soil lithogenic carbonate and the CO2 re-turnover of the decomposition of soil organic carbon. Stable carbon isotope composition of pedogenic carbonate is controlled by the isotopic values of soil CO2, which can be stimulated by unsaturated zone gas steady-state diffusion-production model. Under the carbonate system (soil CO2(g), carbonate, and soil solution) isotopic equilibrium condition, simulation result, from molecular diffusion of biologically produced CO2 and carbonate chemical equilibria reaction model, shows that pedogenic carbonate is enriched by approximately 14‰~16‰ stable C isotope compared to the value of soil organic matter. The diffusion-production model and/or fractionation model can been used to quantify disseminated pedogenic carbonate accumulations, to partition the proportion of pedogenic carbonate in laminations, and to assess quantificationally the effect of land use practices on carbonate solution/deposition balance. That application makes the model very useful in understanding the global carbon cycle.

Key words: Pedogenic carbonate    Fractionation model    δ13C value.    Diffusion-production model    Soil CO2
收稿日期: 2006-04-04 出版日期: 2006-09-15
:  P597  


通讯作者: 李贵桐(1968-),男,北京人,副教授,主要从事农业资源利用与信息技术研究.     E-mail:
作者简介: 杨黎芳(1974-),女,山西乡宁人,博士研究生,主要从事农业资源利用与信息技术研究
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杨黎芳,李贵桐,李保国. 土壤发生性碳酸盐碳稳定性同位素模型及其应用[J]. 地球科学进展, 2006, 21(9): 973-981.

Yang Lifang,Li Guitong,Li Baoguo. Modeling and Application of Stable Carbon Isotope of Pedogenic Carbonate. Advances in Earth Science, 2006, 21(9): 973-981.


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