THE INFLUENCE OF PLANT SPECIES AND PRETREATMENT ON THE 14C AGE OF CAREX-DOMINATED PEAT PLANTS OF A PEAT CORE FROM JINCHUAN MIRE, NE CHINA

IF 2 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Radiocarbon Pub Date : 2023-12-28 DOI:10.1017/rdc.2023.112

Satabdi Misra, Sneha Kashyap, Chun-Yen Chou, Tingyi Chang, Hong-Chun Li, Xiaoyan Ning, Jing-Jing Sun, Jie Wang, Meixun Zhao

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Abstract

The comparisons among 126 14C dates of Carex samples including separated leaf and root parts with acid (A)-treatment and acid-base-acid (ABA)-treatment, and 48 published 14C dates of bulk peat plants on a 92-cm core from Jinchuan Mire in NE China, indicate old carbon influence (OCI) on the 14C dates. The OCI varies with plant species, pretreatment and peat depth. In vascular peat plants such as Carex, humin fractions (remains after ABA treatment) and humic acids are representative of the original plant precursor, while fulvic acids are regarded as the secondary mobile product which should be removed for 14C dating. ABA- treatment removes both fulvic acids and humic acids, whereas A-treatment gets rid of only fulvic acids. Carex roots uptake more dissolved CO2 in peat water. Carex leaves may use more CO2 (involving degassing CO2) above the peat surface. By removing humic acids throughout ABA treatment, the OCI may vary differently over depth (time). ABA treatment cannot eliminate the fixed OCI in humin fractions of vascular peat plants, instead, this treatment may enhance OCI by removing humic acid which may represent the true age of the plants. In addition, Bacon model results on this core could not show rapid changes in accumulation rate.

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植物种类及预处理对中国东北金川沼泽泥炭岩芯中以薹草为主的泥炭植物14C年龄的影响

在中国东北金川沼泽采集的 92 厘米泥炭岩芯上，对 126 个薹草样品（包括经酸（A）处理和经酸-碱-酸（ABA）处理的分离叶片和根部）的 14C 年代和 48 个已发表的大块泥炭植物的 14C 年代进行了比较，结果表明老碳对 14C 年代的影响（OCI）。OCI 随植物种类、预处理和泥炭深度的不同而变化。在维管泥炭植物（如薹草）中，腐殖质组分（ABA 处理后的残留物）和腐殖酸是原始植物前体的代表，而富里酸被认为是次要的移动产物，在进行 14C 测定时应去除。经 ABA 处理后，富营养化酸和腐植酸都会被去除，而经 A 处理后，只有富营养化酸会被去除。薹草的根吸收泥炭水中更多的溶解二氧化碳。薹草叶片可能会吸收泥炭表面更多的二氧化碳（包括脱气二氧化碳）。通过在整个 ABA 处理过程中去除腐殖酸，OCI 可能会随深度（时间）的不同而变化。ABA 处理无法消除维管泥炭植物腐殖质部分中固定的 OCI，相反，这种处理可能会通过去除腐殖酸来提高 OCI，而腐殖酸可能代表植物的真实年龄。此外，该岩心的培根模型结果无法显示积累率的快速变化。

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来源期刊

Radiocarbon 地学-地球化学与地球物理

CiteScore

16.20

自引率

6.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Radiocarbon serves as the leading international journal for technical and interpretive articles, date lists, and advancements in 14C and other radioisotopes relevant to archaeological, geophysical, oceanographic, and related dating methods. Established in 1959, it has published numerous seminal works and hosts the triennial International Radiocarbon Conference proceedings. The journal also features occasional special issues. Submissions encompass regular articles such as research reports, technical descriptions, and date lists, along with comments, letters to the editor, book reviews, and laboratory lists.