Transportation characteristics of delta C-13 in the plants-soil-bedrock-cave system in Chongqing karst area
Li, TY (Li TingYong)[1,2,3]; Li, HC (Li HongChun)[4,5]; Xiang, XJ (Xiang XiaoJing)[1]; Kuo, TS (Kuo Tz-Shing)[5]; Li, JY (Li JunYun)[1]; Zhou, FL (Zhou FuLi)[1]; Chen, HL (Chen HongLi)[1]; Peng, LL (Peng LingLi)[1]
2012-04-30
发表期刊SCIENCE CHINA-EARTH SCIENCES
卷号55期号:4页码:685-694
文章类型期刊论文
摘要

Here we use an analytical method to determine delta C-13 in local plants and organic matter in the soils above Furong cave, Chongqing, China. We also monitored delta C-13 in dissolved inorganic carbon (DIC) of drip water, delta C-13 of active deposits under the drip waters, and the concentration of air CO2 (PCO2). Based on these, we preliminarily studied the transportation characteristics of stable carbon isotope (C-13) in cave system of the subtropical karst area. The average delta C-13 value of 27 local plant samples, which belong to 16 families, was -32aEuro degrees and the weighted delta C-13 for surface dry biomass was -33aEuro degrees. We found that for 54 soil samples collected from 5 soil profiles, delta C-13 of soil organic matters was -22aEuro degrees, which could be attributed to the different transportation rates of stable carbon isotopes during the decomposition of plants and organic matters in soils. The relatively lighter C-12 tended to transfer into gaseous CO2, which made the relatively heavier C-13 concentrated in the soils. On the basis of monitoring of DIC-delta C-13 in drip waters from July 2009 to June 2010, we found that values in winter months were heavier and values in summer months were lighter in general, the reason of which was that in summer months, both the temperature and the humidity were comparatively higher, resulted in more CO2 with lighter delta C-13 generated from organic matters decomposition and plants respiration. The average DIC-delta C-13 value was -11aEuro degrees, about 11aEuro degrees heavier than the delta C-13 of organic matters in soils, which proved that part of DIC in cave drip water was sourced from dissolution of inorganic carbonate (host rock, with heavier delta C-13). As for the delta C-13 of active deposits at five drip water sites in Furong cave, they had almost the same variation with relatively light values. In other words, these active speleothems were deposited at equilibrium conditions for isotopic fractionation. These results suggest that the carbon isotopic information of speleothems could be used to track the evolution of local vegetation in certain situations.

关键词Karst Area Δ13c Plant Soil Organic Matter Dic-δ13c In Drip Water Active Speleothems
DOI10.1007/s11430-011-4294-y
收录类别SCI ; EI
语种英语
引用统计
被引频次:16[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/10212
专题黄土与第四纪地质国家重点实验室(2010~)
通讯作者Li, TY (Li TingYong)[1,2,3]
作者单位1.School of Geographical Sciences, Southwest University, Chongqing 400715, China;
2.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy Sciences, Xi’an 710075, China;
3.Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment, Chongqing University & Southwest University,Ministry of Education, Chongqing 400715, China;
4.Department of Geosciences, Taiwan University, Taipei 10617, China;
5.Department of Earth Sciences, Cheng-Kung University, Tainan 70101, China
推荐引用方式
GB/T 7714
Li, TY ,Li, HC ,Xiang, XJ ,et al. Transportation characteristics of delta C-13 in the plants-soil-bedrock-cave system in Chongqing karst area[J]. SCIENCE CHINA-EARTH SCIENCES,2012,55(4):685-694.
APA Li, TY .,Li, HC .,Xiang, XJ .,Kuo, TS .,Li, JY .,...&Peng, LL .(2012).Transportation characteristics of delta C-13 in the plants-soil-bedrock-cave system in Chongqing karst area.SCIENCE CHINA-EARTH SCIENCES,55(4),685-694.
MLA Li, TY ,et al."Transportation characteristics of delta C-13 in the plants-soil-bedrock-cave system in Chongqing karst area".SCIENCE CHINA-EARTH SCIENCES 55.4(2012):685-694.
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