中国岩溶2016，Vol.35Issue(2)：164-172,9.DOI:10.11932/karst20160205
半干旱岩溶区土壤次生碳酸盐比例及对岩溶碳汇计算的影响
Proportion of pedogenic carbonates and the impact on carbon sink calculation in karst area with semiarid environment
摘要
Abstract
Quantitative evaluation of proportion and source of pedogenic carbonates in karst area with semiar-id environment have contributed to understand the mechanism of soil system affecting karst process,which has great significance in karst carbon cycle research.Soil samples were collected from soil profile of forest land,abandoned farmland and brushland,in a typical small watershed in semi-arid area,southwest of Jinzhong basin,Shanxi Province,China,for analysis of content andδ1 3 C of soil carbonates,content andδ1 3 C of CO 2 and δ1 3 C of parent rocks,hence to explore their variation with depth and controlling factors,and quantify ratio of pedogenic carbonates in soil carbon.Results show that in the upper layer(0 to 50 cm),the content of soil carbonates and CO 2 increase with depth,while the δ1 3 C of soil carbonates and CO 2 decrease with depth.In the lower layer (50-70 cm),the content of soil carbonates and CO 2 decrease with depth,and the δ1 3 C of soil carbonates and CO 2 increase with depth.The content and δ1 3 C of soil carbonates are mainly controlled by pedogenic carbonates proportion,while the content and δ1 3 C of CO 2 are mainly affected by at-mospheric CO 2 and soil CO 2 generated by organic matter decomposition in the upper layer,and impacted by karst process in soil-rock interface in the lower layer.The average proportion of pedogenic carbonates is 52%,42%,32% for abandoned farmland,forest land and brushland,respectively.This paper confirmed that the lithogenic carbonates can transform to pedogenic carbonates in north karst area with semiarid envi-ronment.关键词
岩溶碳汇/碳酸盐/次生碳酸盐/δ1 3 C 值/土壤 CO 2Key words
karst carbon sink/soil carbonate/pedogenic carbonates/δ1 3 C value/soil CO 2分类
天文与地球科学引用本文复制引用
黄奇波,覃小群,刘朋雨,张连凯,苏春田..半干旱岩溶区土壤次生碳酸盐比例及对岩溶碳汇计算的影响[J].中国岩溶,2016,35(2):164-172,9.基金项目
国家自然科学基金项目(41302211) （41302211）
中国地质调查项目(12120113005200) （12120113005200）
