乐秀琴^1,2,,
吴海斌^1,2,3,,,
张文超¹,
李琴¹,
喻杰^1,2,
刘慧^1,2,
于严严¹
1. 中国科学院地质与地球物理研究所, 中国科学院新生代地质与环境重点实验室, 北京 100029
2. 中国科学院大学, 北京 100049
3. 中国科学院生物演化与环境卓越创新中心, 北京 100044

基金项目: 国家重点研发计划项目（批准号：2016YFA0600504）、中国科学院（B类）战略性先导科技专项项目（批准号：XDB26000000）和国家自然科学基金项目（批准号：41888101、41572165、41125011和41877441）共同资助


详细信息

作者简介: 乐秀琴, 女, 26岁, 硕士研究生, 第四纪地质学专业, E-mail: lexiuqin@mail.iggcas.ac.cn

通讯作者: 吴海斌, E-mail: haibin-wu@mail.iggcas.ac.cn

中图分类号: P593;P532

收稿日期:2021-01-29
修回日期:2021-04-30
刊出日期:2021-07-30

Peatland initiation in China associated with climate changes since the Last Glacial Maximum

LE Xiuqin^1,2,,
WU Haibin^1,2,3,,,
ZHANG Wenchao¹,
LI Qin¹,
YU Jie^1,2,
LIU Hui^1,2,
YU Yanyan¹
1. Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029
2. University of Chinese Academy of Sciences, Beijing 100049
3. Center for Excellence in Life and Paleoenvironment, CAS, Beijing 100044


More Information

Corresponding author: WU Haibin,E-mail:haibin-wu@mail.iggcas.ac.cn

MSC: P593;P532

--> Received Date: 29 January 2021
Revised Date: 30 April 2021
Publish Date: 30 July 2021


摘要
摘要:泥炭是陆地生态系统碳库的重要组成部分，其发育演化对全球碳循环具有重要的影响。然而，目前轨道时间尺度上中低纬泥炭发育与季风演化关系及其对全球CH₄浓度变化的影响，还存在很大的争议。本研究基于末次冰盛期以来我国泥炭发育的起始¹⁴C年龄数据，通过年龄概率密度方法，系统重建了东亚季风区泥炭发育的时空演变历史。结果表明：末次冰盛期我国南方泥炭开始发育，冰消期以来泥炭发育逐步扩展至华北、东北、西北和青藏高原地区，并发育增强；全新世时段，不同区域泥炭发育存在明显的空间差异，东北和西北泥炭发育呈现持续增加，而南方、华北和青藏高原地区在早-中全新世增加，之后呈现下降趋势。结合全国孢粉记录的古气候定量化重建结果，发现我国末次冰盛期以来不同区域泥炭发育主要受降水变化的影响，揭示出泥炭发育主要受控于东亚季风降水的演化。研究表明在轨道时间尺度上，东亚季风演化及其导致的泥炭发育变化对全球CH₄浓度变化具有重要的贡献。
关键词: 泥炭发育/
古气候定量化/
东亚季风/
CH₄浓度变化/
末次冰消期/
全新世

Abstract:As a key component of terrestrial ecosystem with organic-rich wetlands, the widespread establishment of peatland since the Last Glacial Maximum(LGM) represents the activation of a global carbon cycle. But the role of climate on peat initiation is poorly understood, especially between the peat initiation in low-middle latitudes and monsoon evolution at the orbital time scale, and its influence on the global CH₄ concentration changes. In this study, we used the initiation of peatlands in China since the LGM based on the 917¹⁴C ages of basal peats and the method of time series of summed probability functions of regional peat initiation, including 211 ages for the southern China, 99 ages for the North China, 404 ages for the Northeast China, 24 ages for the Northwest China, and 179 ages for the Qinghai-Tibet Plateau, that were systematically collected the published ages of peat initiation following the criteria: (1) the upper part of the profile is continuous peat deposits; (2) peat thickness is more than 30cm; and (3) the maximum¹⁴C age at the bottom of peat was kept. Our results show that peat initiation in southern China was occurred at the LGM, then gradually expanded to the North China, Northeast China, Northwest China, and Qinghai-Tibet Plateau during the Last Deglacial period. There was a significant spatial difference in peat development during the Holocene, peat initiation showed a continuous increase in the Northeast China and Northwest China; while peat initiation increased during the Early-Middle Holocene, and then showed a downward trend in the Southern China, North China and Qinghai-Tibet Plateau.
Paleoclimate changes since the LGM in China were quantitatively reconstructed using the Modern Analog Technique from the 111 pollen records, including 34 records for the southern China, 19 records for the North China, 18 records for the Northeast China, 13 records for the Northwest China, and 27 records for the Qinghai-Tibet Plateau, that are selected from the newly developed China Quaternary Pollen Database following the criteria: (1) sample resolution is finer than 400 years; (2) age spans were greater than 5000 years; and (3) the distribution of pollen records is consistent with the peats. Our results show that annual mean temperature gradually increased during the deglacial period, the highest at the Early-Middle Holocene, and then the temperature decreased. However, there was spatial difference for annual precipitation. Precipitation increased during the deglaciation period in North China, reached a peak at the Early Holocene, and then gradually decreased. Precipitation increased from the deglacial period to the Early Holocene, reached the maximum at the Middle-Holocene, and then decreased in Southern China and Northeast China. While precipitation was continued to increase since the Holocene in Northwest China.
We find that peat initiation in different regions was driven primarily by precipitation rather than by temperature using the correlation analysis between peat initiation and climate changes, revealing that the peat initiation in China since the LGM was mainly controlled by the evolution of East Asian monsoon. Our finding shed light on the role of East Asian monsoon evolution in the peat initiation, with an important impact on the global CH₄ concentration changes at the orbital time scale.
Key words:peat initiation/
quantitative paleoclimate reconstruction/
East Asian monsoon/
CH₄ concentration changes/
Last Deglacial period/
Holocene



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