郭海春^1,,
田怡苹¹,
魏士凯¹,
易嘉慧¹,
杨敏¹,
欧阳睿¹,
张东良²,
饶志国^1,,
1. 湖南师范大学资源与环境科学学院, 湖南 长沙 410081
2. 中国科学院新疆生态与地理研究所, 中国科学院中亚生态与环境研究中心, 新疆 乌鲁木齐 830011

基金项目: 国家自然科学基金项目（批准号：41772373）和湖南省自然科学基金****基金项目（批准号：2018JJ1017）共同资助


详细信息

作者简介: 郭海春, 女, 24岁, 硕士研究生, 地球化学与古气候变化研究, E-mail:guohc@smail.hunnu.edu.cn

通讯作者: 饶志国, E-mail:raozhg@hunnu.edu.cn

中图分类号: P595;P532

收稿日期:2019-11-26
修回日期:2020-03-05
刊出日期:2020-09-30

Comparison and analyses of the Holocene peat α-cellulose stable carbon isotopic records from China

Guo Haichun^1,,
Tian Yiping¹,
Wei Shikai¹,
Yi Jiahui¹,
Yang Min¹,
Ouyang Rui¹,
Zhang Dongliang²,
Rao Zhiguo^1,,
1. College of Resources and Environmental Sciences, Hunan Normal University, Changsha 410081, Hunan
2. Xinjiang Institute of Ecology and Geography, Research Center for Ecology and Environment of Central Asia, Chinese Academy of Sciences, Vrümqi 830011, Xinjiang


More Information

Corresponding author: Rao Zhiguo,E-mail:raozhg@hunnu.edu.cn

MSC: P595;P532

--> Received Date: 26 November 2019
Revised Date: 05 March 2020
Publish Date: 30 September 2020


摘要
摘要:泥炭是古气候研究的宝贵材料，α纤维素稳定碳同位素（δ¹³C_cell）是泥炭古气候研究的常用代用指标。我国已有数个地点报道了全新世泥炭全样或单种植物δ¹³C_cell记录，对这些记录的古气候解译存在明显冲突。结合相应的孢粉和植物残体证据，对这些记录进行综合对比，结果发现：高山草地植被带和内陆干旱区荒漠草原植被带当中的泥炭地，全新世期间的原地植物种属构成相对稳定且未发生显著变化，因此其δ¹³C_cell记录具有较为明显的长期变化趋势，其古气候解译也更为可靠；森林植被带和林草交互带当中的泥炭地，全新世期间的原地植物种属构成发生过显著变化（如木本植物入侵），这可能是造成其全新世δ¹³C_cell记录长期趋势不明显或其古气候指示意义复杂难解的主要原因。这些结果显示了泥炭地的原地植物种属构成，对相应δ¹³C_cell记录的古气候解译的重要影响。同时也表明，无论是泥炭δ¹³C_cell研究地点的选择，还是泥炭δ¹³C_cell记录的古气候解译，都需重视其来源植物种属构成和变化。对于全新世泥炭δ¹³C_cell古气候研究，建议开展针对性的现代过程研究，尤其是优势泥炭植物种属的δ¹³C_cell在时间序列上的现代过程研究，以提供可靠的古气候解译基础。
关键词: 泥炭/
全新世/
α纤维素/
稳定碳同位素/
植被/
古气候

Abstract:Peat is a precious archive for paleoclimatic studies. The stable carbon isotopic composition of peat α-cellulose (δ¹³C_cell) has been widely adopted for paleoclimatic studies. There are several Holocene δ¹³C_cell records of bulk peat samples or residues of a specific plant species have been reported in China, including the δ¹³C_cell records from the Sahara sand peatland, Big Black peatland, Narenxia peatland in the Altai Mountains in northern Xinjiang region, the Chaiwobu peatland in the Tianshan Mountains in central Xinjiang region, the Hongyuan peatland in the northeastern Qinghai-Tibet Plateau, the Yuexi peatland in Southwestern China, the Dajiuhu peatland in Central China, and the Hani peatland in Northeastern China. However, both the obtained δ¹³C_cell records themselves and the paleoclimatic interpretations of the δ¹³C_cell records, are quite different. In this paper, combined with the relevant evidence of pollen and plant marcofossils, the δ¹³C_cell records are carefully compared and analyzed. The results demonstrated that, in the peatlands in the alpine meadow zone and the arid inland desert-grass zone, the composition of plant species of the in situ vegetation was relative stable that without significant variations during the Holocene, and therefore the Holocene δ¹³C_cell records from these peatlands have apparent long-term change trends, which could be paleoclimatically interpreted easily. However, in the peatlands in the forest zone and the forest/grassland transitional zone, the composition of plant species of the in situ vegetation experienced significant variations (for example, the invasion of woody plants into the peatland) during the Holocene, that's might the main reason why the Holocene δ¹³C_cell records from these peatlands without apparent long-term change trends and the paleoclimatic significance of these Holocene δ¹³C_cell records cannot be determined easily. All the results highlight the important influence from the plant composition of in situ peat vegetation on the paleoclimatic interpretations of peat δ¹³C_cell records. Therefore, both the composition and the change of the in situ peat plants should be seriously considered in both the selection of the peat δ¹³C_cell study site and the paleoclimatic interpretation of the obtained peat δ¹³C_cell record. The site-specific modern-process study results, especially the results of the δ¹³C_cell variations of the dominant peat plant species along time sequences, are important modern references for the paleoclimatic interpretations of Holocene peat δ¹³C_cell records.
Key words:peat/
Holocene/
α-cellulose/
δ¹³C/
tree/grass/
paleoclimatic interpretation



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