| 晚全新世黔西南喀斯特地区兴义泥炭高分辨率腐殖化度记录研究 |
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| 引用本文： | 杨欢,曾蒙秀,彭海军,蔡诚,李凤全,邓伯龙,朱丽东,胡忠行,倪健.晚全新世黔西南喀斯特地区兴义泥炭高分辨率腐殖化度记录研究[J].沉积学报,2021,39(2):395-407. |
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| 作者姓名： | 杨欢 曾蒙秀 彭海军 蔡诚 李凤全 邓伯龙 朱丽东 胡忠行 倪健 |
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| 作者单位： | 浙江师范大学地理与环境科学学院,浙江金华 321004;中国科学院地球化学研究所环境地球化学国家重点实验室,贵阳 550081;贵州理工学院化学工程学院,贵阳 550081;贵州省湿地保护中心,贵阳 550001;浙江师范大学化学与生命科学学院,浙江金华 321004 |
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| 基金项目： | 国家重点研发计划项目;浙江省自然科学基金项目;国家自然科学基金项目;中国科学院A类战略性先导科技专项;贵州省科技计划项目 |
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| 摘 要： | 季风气候区泥炭重要组成部分—贵州泥炭的研究较缺乏，其腐殖化度的环境指示意义尚有待挖掘。对黔西南喀斯特地区的兴义泥炭XY1钻孔进行AMS14C测年并构建年代框架，结合不同波长的高分辨率腐殖化度测定，及钻孔沉积速率和碳累积速率，重建黔西南3 000~1 770 cal. a B.P.的泥炭沉积过程，并探讨其可能的受控机制。结果表明:1）XY1钻孔样品的腐殖化度受温度和降水的双重控制，腐殖化度高值指示气候干冷，反之则指示气候湿热；2）3 000~2 700 cal. a B.P.腐殖化度较低且呈上升趋势，碳累积速率较低且呈下降趋势，沉积速率较低并且波动不明显，泥炭沉积较为缓慢；2 700~2 400 cal. a B.P.腐殖化度下降，碳累积速率、沉积速率略有上升，泥炭沉积略有加快；2 400~1 950 cal. a B.P.腐殖化度升高，碳累积速率、沉积速率处于高值，泥炭沉积快；1 950~1 770 cal. a B.P.腐殖化度、碳累积速率、沉积速率快速下降后回升，泥炭沉积发生明显波动；3）功率谱和小波分析显示，腐殖化度变化序列存在83 a、55 a、38 a、31 a、27 a、22 a准周期，与双海尔周期、布鲁克纳周期和太阳活动世纪周期相一致，表明该区气候变化和泥炭沉积受太阳活动的驱动。
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| 关 键 词： | 喀斯特地区 腐殖化度 晚全新世 碳累积速率 泥炭沉积 |
| 收稿时间： | 2019-07-25 |
High-resolution Humification Record of Xingyi Peat since the Late Holocene in Karst Region,Southwestern Guizhou |
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| YANG Huan,ZENG MengXiu,PENG HaiJun,CAI Cheng,LI FengQuan,DENG BoLong,ZHU LiDong,HU ZhongXing,NI Jian.High-resolution Humification Record of Xingyi Peat since the Late Holocene in Karst Region,Southwestern Guizhou[J].Acta Sedimentologica Sinica,2021,39(2):395-407. |
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| Authors: | YANG Huan ZENG MengXiu PENG HaiJun CAI Cheng LI FengQuan DENG BoLong ZHU LiDong HU ZhongXing NI Jian |
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| Institution: | 1.College of Geography and Environment Sciences, Zhejiang Normal University, Jinhua, Zhejiang 321004, China2.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Science, Guiyang 550081, China3.School of Chemical Engineering, Guizhou Institute of Technology, Guiyang 550081, China4.Wetland Protection Center of Guizhou Province, Guiyang 550001, China5.College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua, Zhejiang 321004, China |
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| Abstract: | Peat in Guizhou province is an important source of peat in the Asian monsoon zone.This study reveals the environmental significance of the degree of humification of Guizhou peat.The AMS14 C dating method was used to establish a chronological framework of XY1 core from Xingyi peatland,a new paleoenvironmental record from the karst area of southwestern China.A high-resolution analysis of the extent of humification,the deposition rate and the carbon accumulation rate estimated the climatic evolutionary history and peat deposition process for the period 3000-1770 cal.a B.P.,and a possible mechanism is discussed.The following were found.(1)The humification extent of XY1 core was controlled by both precipitation and temperature.High humification values indicate cold,dry conditions,and vice versa.(2)During the 3000-2700 cal.a B.P.period,the degree of humification was low,but with a rising trend.The carbon accumulation rate was low and showed a decreasing trend.The deposition rate was low and relatively stable,and the peat deposition process was relatively weak.From 2700 cal.a B.P.to 2400 cal.a B.P.the humification degree decreased,while the carbon accumulation rate and deposition rate increased slightly,indicating that the peat deposition was accelerating slowly.Between 2400 cal.a B.P.and 1950 cal.a B.P.,the humification degree increased,and the carbon accumulation rate and deposition rate all peaked,and peat was deposited rapidly.From 1950 cal.a B.P.to 1770 cal.a B.P.,the humification degree,carbon accumulation rate and deposition rate all varied significantly and a fluctuating peat deposition was obvious.(3)The power spectrum and wavelet analysis of the degree of humification indicated a double Hale cycle,Brückner cycle and century cycle of solar activity.Consequently,it was inferred that climate change and Xingyi peatland deposition were driven by solar activity in Xingyi,southwestern Guizhou. |
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| Keywords: | karst region humification degree Late Holocene carbon accumulation rate peat deposition |
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