Determining CO_2 consumption from elemental change in soil profiles developed on carbonate and silicate rocks

作     者：Daojing Li Hongbing Ji 

作者机构：State Key Laboratory of Environmental GeochemistryInstitute of GeochemistryChinese Academy of Sciences College of Resource Environment and TourismCapital Normal University 

出 版 物：《Chinese Journal Of Geochemistry》 (中国地球化学学报)

年 卷 期：2015年第34卷第2期

页      面：177-193页

核心收录：

学科分类：070902[理学-地球化学] 0709[理学-地质学] 081803[工学-地质工程] 07[理学] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：supported by the National Natural Science Foundation of China(NSFC) grants(No.41073096 and 40473051) National Key Basic Research Program of China (2013CB956702) the Hundred Talents Program of the Chinese Academy of Sciences 

主　　题：硅酸盐岩石 碳酸盐岩 界面元素 土壤剖面 二氧化碳 消耗 化学风化 开发 

摘      要：To further understand the roles of carbonate and silicate rocks in regulating the atmosphere/soil CO_2level,the flux of CO_2 consumed by the chemical weathering of silicate and carbonate rocks was determined from the elemental change in soil *** showed that the chemical weathering of carbonate rocks mainly occurred at the rock-regolith interface,and that the further weathering of the residua soil on the carbonate rocks was similar to that of the granite *** weathering of the silicate rocks occurred through the whole ***,CO_2 consumed per volume by the silicate profiles[M_(sr)(CO_2)]and the residues on carbonate rocks[M_(cr)(CO2)]were calculated based on the elemental weathering ***_2 consumed by carbonate protolith[M_(cp)(CO_2)]was calculated from the elemental change at the rock-regolith *** M_(sr)(CO_2) were about tens to thousands orders of magnitude greater than M_(cr)(CO_2).Even so,this demonstrated that the residues on carbonate rocks could be a sink of CO2_ on long-term *** M_(cp)(CO_2) was about four times larger than M_(sr)(CO_2),which demonstrated that carbonate rocks played a more important role in regulating the CO_2 level than the silicate rocks did during the pedogenic process of the profiles.