| 雅鲁藏布江中上游地区表土碳同位素变化及其影响因素初探 |
| |
| 引用本文： | 王树源,范义姣,杨军怀,陈梓炫,田伟东,高福元,夏敦胜.雅鲁藏布江中上游地区表土碳同位素变化及其影响因素初探[J].冰川冻土,2022,44(4):1130-1139. |
| |
| 作者姓名： | 王树源 范义姣 杨军怀 陈梓炫 田伟东 高福元 夏敦胜 |
| |
| 作者单位： | 1.兰州大学 资源环境学院 西部环境教育部重点实验室，甘肃 兰州 730000;2.兰州城市学院 城市环境学院，甘肃 兰州 730070 |
| |
| 基金项目： | 第二次青藏高原综合科学考察研究项目“粉尘气溶胶及其气候环境效应”(2019QZKK0602) |
| |
| 摘 要： | 土壤有机碳同位素组成（δ13C）记录的环境信息对研究气候与环境变化至关重要，然而高海拔地区土壤δ13C对气候变化的响应机制尚不明确。对青藏高原南部雅鲁藏布江中上游地区（海拔3 500~5 100 m）的36个表土样品进行了δ13C系统分析，并讨论了其对气候因素的响应。结果表明：表土δ13C值分布在-24.6‰~-15.2‰范围之间，平均值为-20.8‰，指示了地上植被为C3/C4混合植被类型。随着海拔的升高，C4植物比例减少，C3植物比例增加，这种比例变化主导了该区域表土δ13C的组成差异。海拔每升高100 m，δ13C值偏负0.5‰。进一步分析说明，生长季温度可能是影响该区域表土δ13C变化的主要气候因子，降水、大气压等对δ13C值的贡献较低。
|
| 关 键 词： | 碳同位素 温度 降水 表土 雅鲁藏布江 |
| 收稿时间： | 2021-06-02 |
| 修稿时间： | 2021-08-24 |
A preliminary study on the variation of stable carbon isotope in surface soil and its influencing factors in the upper and middle reaches of Yarlung Zangbo River |
| |
| Shuyuan WANG,Yijiao FAN,Junhuai YANG,Zixuan CHEN,Weidong TIAN,Fuyuan GAO,Dunsheng XIA.A preliminary study on the variation of stable carbon isotope in surface soil and its influencing factors in the upper and middle reaches of Yarlung Zangbo River[J].Journal of Glaciology and Geocryology,2022,44(4):1130-1139. |
| |
| Authors: | Shuyuan WANG Yijiao FAN Junhuai YANG Zixuan CHEN Weidong TIAN Fuyuan GAO Dunsheng XIA |
| |
| Institution: | 1.Key Laboratory of Western China’s Environmental Systems （Ministry of Education），College of Earth and Environmental Sciences，Lanzhou University，Lanzhou 730000，China;2.College of Urban Environment，Lanzhou City University，Lanzhou 730070，China |
| |
| Abstract: | The environmental information recorded by the stable carbon isotope compositions of soil organic matter （δ13C） is crucial to the study of climate change， but the mechanism by which the soil δ13C responds to climate change at high altitude remains unclear. A systematically analysis on the δ13C of 36 surface soil samples in the upper and middle reaches of the Yarlung Zangbo River， southern Qinghai-Tibet Plateau （altitude between 3 500 and 5 100 m） was carried out， and the responses of δ13C to climatic factors were discussed. Results showed that the δ13C values ranged from -24.6‰ to -15.2‰， with an average value of -20.8‰， indicating that the aboveground vegetation is C3/C4 vegetation type.With the increase of altitude， the proportion of C4 plants decreased but C3 plants increased， which dominated the difference of δ13C composition. when the altitude increased by 100 m， the δ13C became lighter by 0.5‰. Further analysis suggested the growing season temperature may be the main climatic factor affecting the variation of δ13C， and the contribution of precipitation and atmospheric pressure were lower. |
| |
| Keywords: | stable carbon isotope composition temperature precipitation surface soil Yarlung Zangbo River |
|
| 点击此处可从《冰川冻土》浏览原始摘要信息 |
| 点击此处可从《冰川冻土》下载免费的PDF全文 |
