15000年以来若尔盖高原泥炭地发育及其碳动态

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PDF HTML阅读 XML下载 导出引用 引用提醒 15000年以来若尔盖高原泥炭地发育及其碳动态 DOI: 10.5846/stxb201804240932 作者: 作者单位: 中国科学院成都生物研究所,中国科学院成都生物研究所,中国科学院成都生物研究所,中国科学院成都生物研究所,中国科学院成都生物研究所,中国科学院成都生物研究所,中国科学院成都生物研究所,中国科学院成都生物研究所 作者简介: 通讯作者: 中图分类号: 基金项目: 国家重点研发计划项目（2016YFC0501804）；中国科学院前沿科学重点研究项目（QYZDB-SW-DQC007）；国家自然科学基金项目（31570480，41571220） Peatland development and carbon dynamics histories of Zoige peatlands for 15000 years Author: Affiliation: Chengdu Institute of Biology, Chinese Academy of Sciences,,,,,,,Chengdu Institute of Biology, Chinese Academy of Sciences Fund Project: The National Key Research and Development Program of China (2016YFC0501804), the Key Research Program of Frontier Sciences, the Chinese Academy of Sciences (QYZDB-SSW-DQC007) and the National Natural Science Foundation of China (31570480, 41571220). 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:高海拔泥炭地是维护高原气候环境稳定的重要生态系统，由于其兼具高海拔和高寒的特点，对气候变化尤为敏感。若尔盖高原泥炭地是中国高海拔泥炭地集中分布区，碳储量丰富，由于方法学差异及数据缺乏，其碳储量估算仍存在一定程度的不确定性，对长时间尺度碳通量的模拟研究还较为匮乏。因此，以若尔盖高原泥炭地为研究对象，基于若尔盖高原泥炭地每千年的面积变化和碳累积速率重新评估若尔盖高原泥炭地碳储量，并利用泥炭分解模型和碳通量重建模型探讨了15000年以来若尔盖高原泥炭地碳通量动态。研究结果表明，若尔盖高原泥炭地约从15000年开始发育，发育高峰期在12000-10000年和7000-5000年，泥炭累积速率范围为0.22-1.31 mm/a，平均值为0.56 mm/a；碳累积速率范围为13.4-77.2 g C m-2 a-1，平均碳累积速率为33.5 g C m-2 a-1，3000年至今碳累积速率最高，7000-6000年是碳累积速率次峰值时期；15000年以来若尔盖高原泥炭地碳储存量达1.4 Pg（1 Pg=1015 g），碳累积输入和碳累积释放分别为5.6 Pg和4.2 Pg；净碳平衡平均值为0.087 Tg（1 Tg=1012 g）C/a，峰值出现在11000-10000年为0.295 Pg；在6000-2000年若尔盖泥炭地出现微弱碳源，最大值出现在5000-4000年，约为-0.034 Pg，净碳平衡在15000-11000年和4000年至今呈现上升趋势，而10000-4000年整体呈现下降趋势。总体而言，若尔盖高原泥炭地碳储量丰富，是青藏高原东部重要的陆地生态系统碳库和碳汇，本研究将为我国高海拔泥炭地碳库保育提供一定的理论和数据支撑。 Abstract:Peatlands are carbon-rich wetlands that have acted as globally important carbon pools by affecting the atmospheric CO2 over long timescales. Knowledge of peatland initiation and carbon dynamics can help predict peat carbon fate in the future. Also, understanding relative changes in carbon flux processes will contribute to a more comprehensive understanding of carbon cycles and the interaction between peatland and climate. The Zoige peatlands are the most representative peatlands in China. This study presents a data synthesis of peatland basal ages, area changes, carbon accumulation rate variations, and, furthermore, analyzed and separated carbon uptake and release, two important carbon flux processes from the observed peat carbon data in Zoige peatlands during the Holocene. The Zoige peatlands showed initiation peaks at 12000-10000 a and 7000-5000 a. The peat accumulation rates ranged from 0.22 to 1.31 mm/a with a mean value of 0.56 g C m-2 a-1. Carbon accumulation rates in Zoige ranged from 13.4 to 77.2 g C m-2 a-1, with a mean value of 33.5 g C m-2 a-1. The carbon pools were estimated to be 1.4 Pg over the entire Zoige peatlands, with results circumventing the uncertainties of previous studies due to peat sampling depth. The long-term decomposition rate for the Zoige peatlands was 0.00024038/a, which is comparable to the long-term decomposition rate of tropical peatlands, and higher than in northern and southern peatlands. The net carbon balance (NCB) rate of Zoige peatlands had a mean value of 0.087 Tg C/a with a maximum of 0.295 Pg. The Zoige peatlands functioned as a carbon source during 6000-2000 a with a minimum NCB value of -0.034 Pg at 5000-4000 a. Overall, the Zoige peatlands were an important carbon pool, however, with some variability. Our results in this study highlighted the importance of carbon cycle research in the Zoige peatlands, and also provided reference values to guide future studies. 参考文献 相似文献 引证文献