Climatic and environmental changes since 2 kaBP by End Member Modeling analysis on grain size data from a peat core of Yuhua Mountain, Jiangxi Province
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摘要:
利用江西玉华山沼泽泥炭地YSH-2钻孔的沉积物进行AMS14C测年，建立年代框架，结合该孔粒度参数、粒级组分、粒级-标准偏差、端元分析法分析，探寻响应气候变化的粒级组分，重建2 000 aBP以来气候环境。结果表明，玉华山泥炭地沉积物粒度组成以细粉砂（4～16 μm）为主，中粗粉砂（16～64 μm）次之；运用端元分析法得出3个端元，其中端元组分EM1代表水动力搬运来的较细组分，指示气候的干湿状况，EM2是反映土壤的成壤改造作用的组分，EM3是突发性的气候变化带来的组分。通过偏差法得出的敏感组分10.473～16.535 μm，结合上述3个端元的变化规律，得出近2 000 a的干湿变化：（1）0—300 AD阶段，降水逐渐增多，气候由干转湿；（2）300—500 AD气候由湿润转入干旱，但整体较干；（3）500—650 AD气候波动与突发性洪涝灾害都较少，是稳定且持续的湿润期；（4）650—900 AD，气候波动较大，变化频繁，总体偏干；（5）900—1400 AD是较为湿润的时期，其中有100年的频繁波动期；（6）1400—1800 AD为小冰期，此区域的气候变化分为湿-干-湿的3个阶段。
Abstract:Based on the AMS14C dating of a peat core from Mt Yuhua in Jiangxi Province, China, we explore how grain size varies in response to climate changes. We then reconstruct climate change since 2 000 aBP through grain size analysis, grade-standard deviation method, and end-member model. Our results show that the sediments in the peatland of Mt Yuhua are mainly consisting of fine sand (4～16 μm) and coarse silt (16～64 μm). Three end-members EM1, EM2, and EM3 represent, respectively, fine components transported by hydrodynamics, soil-forming components, and components that reflect abrupt climate changes. Grade-standard deviation indicates a range of sensitive components between 10.473 and 16.535 μm. Our reconstruction shows, first and foremost, an increase in precipitation between AD 1−300, Which was fellowed by a generally dry condition in AD 300−500 and a wet condition in AD 500−650, the latter period probably witnessed fewer climate fluctuations and floods. Despite an overall dry condition, climate fluctuated greatly in AD 650−900, and, while AD 900−1400 was relatively humid, the climate was not stable for a brief duration of 100 years. The Little Ice Age (LIA), spanning over 500 hundred years from AD 1400 to 1800, can be roughly divided into three stages, each governed by a wet, dry, and wet condition. The palaoclimatic reconstruction in this study is proved to be reliable when compared with δ18O data collected from Dongge cave and the humidity index of Jiangnan region.
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Key words:
- peat /
- grain size /
- grade-standard deviation method /
- end member modeling /
- climate change
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样品编号 深度/cm 测年材料 14C年龄/aBP δ13C/‰ 校正年龄2σ YHS2-45 45 陆生植物残体 110.1±0.3 −26.9‰ YHS2-70 70 陆生植物残体 250±30 −23.9‰ 1520—1575 AD YHS2-90 90 陆生植物残体 260±30 −25.1‰ 1525—1555 AD YHS2-117 117 孢粉浓缩物 430±30 −24.2‰ 1430—1485 AD YHS2-130 130 孢粉浓缩物 420±30 −25.2‰ 1435—1490 AD YHS2-147 147 孢粉浓缩物 530±30 −26.7‰ 1405—1445 AD YHS2-172 172 孢粉浓缩物 670±30 −27‰ 1275—1315 AD YHS2-195 195 陆生植物残体 1 060±30 −23.1‰ 890—1015 AD YHS2-217 217 陆生植物残体 880±30 −27.5‰ 1155—1260 AD YHS2-224 224 孢粉浓缩物 810±30 −27.6‰ 1165—1270 AD YHS2-245 245 陆生植物残体 1 150±30 −25.8‰ 775—790 AD YHS2-265 265 小木屑 930±30 −27.3‰ 1040—1220 AD YHS2-304 304 孢粉浓缩物 1 350±30 −28.9‰ 645—685 AD YHS2-312 312 陆生植物残体 2 380±30 −28.8‰ 405—370 BC YHS2-322 322 孢粉浓缩物 4 910±30 −28.8‰ 3755—3745 BC YHS2-337 337 陆生植物残体 6 630±30 −28.4‰ 5605—5695 BC YHS2-350 350 孢粉浓缩物 7 270±40 −25.8‰ 6225—6050 BC 
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