Is pedogenic carbonate an important atmospheric CO_2 sink?

作     者：LIU ZaiHua 

作者机构：The State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China 

出 版 物：《Chinese Science Bulletin》 (Chinese Science Bulletin)

年 卷 期：2011年第56卷第35期

页      面：3794-3796页

核心收录：

学科分类：083001[工学-环境科学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 0709[理学-地质学] 070901[理学-矿物学、岩石学、矿床学] 07[理学] 08[工学] 

基　　金：supported by the Hundred Talents Program of the Chinese Academy of Sciences the National Natural Science Foundation of China (40872168) 

主　　题：大气CO2 碳酸盐 成土 二氧化碳含量 土壤形成过程 全球碳循环 暗栗钙土 碳同位素技术 

摘      要：Nearly 18 years after the proposal of the weathering-related carbon sink concept(Berner R ***,plants and the long-term carbon *** Cosmochim Acta,1992,56:3225-3231),it is an appropriate timing to re-evaluate its geological context with the updated *** et al.(Ryskov Ya G,Demkin V A,Oleynik S A,et *** of pedogenic carbonate for the last 5000 years and its role as a buffer reservoir for atmospheric carbon dioxide in soils of *** Planet Change,2008,61:63-69) lately claimed that in the course of soil formation for the last 5000 years the soils of Russia fixed atmospheric carbon dioxide as pedogenic carbonate during the arid periods at a rate of 2.2 kg C/(m2 a) in chernozem,1.13 kg C/(m2 a) in dark-chestnut soil,0.86 kg C/(m2 a) in light-chestnut soil,on the basis of carbon isotopic data;however,their interpretations of the data do not appear straightforward nor persuading,and thus their claim is likely *** interpretations are also contrary to the conclusions drawn by Dart et al.(Dart R C,Barovich K M,Chittleborough D J,et *** in regolith carbonates of central and southern Australia:Its source and implications for the global carbon *** Palaeoclimatol Palaeoecol,2007,249:322-334) who found that Australian regolith carbonates did not capture any additional CO2;instead the carbonate was simply being remobilized from one pool to *** we raise comments to these explanations on the following two issues:(1) origin of pedogenic carbonate:silicate weathering *** weathering,and(2) problems in using carbon isotopic technique to distinguish carbonates formed by silicate weathering and carbonate *** is concluded that pedogenic carbonate may not be an important atmospheric CO2 sink at all,*** weathering-related pedogenic carbonate does not capture any additional CO2,while the CO2 capture in silicate weathering-related pedogenic carbonate is small in short-term time scales