阿尔泰山泥炭α-纤维素碳和氧同位素的古环境意义——以黑阳坡泥炭为例  

Paleoenvironmental implications ofα-cellulose carbon and oxygen isotopes from Heiyangpo peatland in the Altai Mountains

作　　者：刘奇 许仲林[1] 张东良[2,3,4] LIU Qi;XU Zhonglin;ZHANG Dongliang(College of Resource and Environmental Science,Xinjiang University,Urumqi 830046,Xinjiang,China;Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,Xinjiang,China;Research Center for Ecology and Environment of Central Asia,Chinese Academy of Sciences,Urumqi 830011,Xinjiang,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]新疆大学资源与环境科学学院,新疆乌鲁木齐830046 [2]中国科学院新疆生态与地理研究所,新疆乌鲁木齐830011 [3]中国科学院中亚生态与环境研究中心,新疆乌鲁木齐830011 [4]中国科学院大学,北京100049

出　　处：《干旱区研究》2022年第1期30-40,共11页Arid Zone Research

基　　金：国家基金委青年基金(41803024);中国博士后科学基金第66批面上基金(2019M663864)。

摘　　要：常年受西风影响的阿尔泰山是古气候研究的重点区域之一。为探究将阿尔泰山泥炭植物碳和氧同位素(δ^(13)C_(cell)和δ^(18)O_(cell))的现代过程研究直接运用到百年或千年尺度古气候重建中的合理性,在可靠的^(210)Pb、^(137)Cs测年基础上,分析了1962—2017年哈巴河气象站冷季(10月—次年4月)、暖季(5—9月)以及年尺度上气温、降水量、相对湿度与黑阳坡泥炭δ^(13)C_(cell)、δ^(18)O_(cell)的相关关系。结果显示:黑阳坡泥炭δ^(13)C_(cell)与5—8月相对湿度显著负相关(r=-0.52,P<0.05),δ^(18)O_(cell)与11月—次年1月降水量显著正相关(r=0.49,P<0.05),黑阳坡泥炭δ^(13)C_(cell)、δ^(18)O_(cell)变化可以看作分别是5—8月相对湿度和11月—次年1月降水量的代用指标。本研究为阿尔泰山泥炭α-纤维素同位素记录的古气候解译提供了多年尺度的数据支撑,不仅丰富了我国关于泥炭地同位素现代器测的过程研究,也对研究区利用泥炭纤维素同位素开展长时间尺度上古气候定量化研究具有重要意义。The Altai Mountains are affected by westerlies all year round and are therefore the focus of paleoclimate research.To explore the rationnality of using the modern process of carbon and oxygen isotopes from peat plants in centennial-or millennial-scale paleoclimate reconstruction in the Altai Mountains,we analyzed the relationship between theα-cellulose carbon and oxygen isotopes(δ^(13)C_(cell) and δ^(18)O_(cell))of Heiyangpo peatland and the meteorological parameters(temperature,precipitation,and relative humidity)measured in the cold season(October-April),warm season(May-September),and annually from Habahe station from 1962 to 2017.Significant relationships were found between δ^(13)C_(cell) and relative humidity in May-August(r=−0.52,P<0.05),and between δ^(18)O_(cell) and precipitation in November-January(r=0.49,P<0.05).Thus,δ^(13)C_(cell) and δ^(18)O_(cell) values are reliable proxies of May-August relative humidity and November-January precipitation,respectively.Our work provides multi-year scale data support for the interpretation of paleoclimate information recorded by peat cellulose isotopes in the Altai Mountains.The research not only informs the modern process study of peat isotopes in China,but also has great significance for quantitative paleoclimate reconstruction in areas using peat cellulose isotopes over long periods.

关 键 词：黑阳坡泥炭 碳氧同位素 器测时段 阿尔泰山 

分 类 号：P532[天文地球—古生物学与地层学]