https://scholars.lib.ntu.edu.tw/handle/123456789/639709
標題: | The Influence of Plant Species and Pretreatment on the <sup>14</sup>C Age of Carex -Dominated Peat Plants of A Peat Core from Jinchuan Mire, Ne China | 作者: | Misra, Satabdi Kashyap, Sneha Chou, Chun Yen Chang, Tingyi HONGCHUN LI Ning, Xiaoyan Sun, Jing Jing Wang, Jie Zhao, Meixun |
關鍵字: | Carex lehmanii | Jinchuan peat Mire China | KEYWORDS: | peat core | pretreatment | species-definite AMS C dating 14 | 公開日期: | 1-一月-2023 | 來源出版物: | Radiocarbon | 摘要: | 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. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/639709 | ISSN: | 00338222 | DOI: | 10.1017/RDC.2023.112 |
顯示於: | 地質科學系 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。