Holocene climate dynamics derived from pollen record of Jiulongchi wetland in Fanjing Mountain, southwest China
Holocene climate dynamics derived from pollen record of Jiulongchi wetland in Fanjing Mountain, southwest China
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DOI：
10.1016/j.quaint.2019.01.009
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发表时间：
2019-04
影响因子：
2.2
通讯作者：
Yang Gao;K. Xiong;Mingying Quan;B. Song;Haijun Peng;H. Peng;Weidan Shen;K. Bao
中科院分区：
文献类型：
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作者：
Yang Gao;K. Xiong;Mingying Quan;B. Song;Haijun Peng;H. Peng;Weidan Shen;K. Bao
在中国西南梵净山获得了一个深度为4.0m的高山湿地芯样。部分核心的14 C数据获得的高分辨率质谱（AMS）的日期，全新世气候变化推断分类的主要树木和蕨类植物植被确定的花粉和孢子计数在不同的核心深度。11.9-8.0 cal ka BP期间温度升高，最高温度出现在8.0-4.6 cal ka BP。全新世晚期逐渐变冷。我们的温度估计与以往亚洲季风区全新世温度的研究结果吻合得很好。在10.7-8.0 cal ka BP和4.6-2.6 cal ka BP之间存在两个相对湿润期。华南、华北和西南地区降水存在不同步的趋势，这可能是由于季风影响的不同。在东亚夏季风区，全新世早中期季风降水逐渐北侵，晚全新世季风降水逐渐南退。研究结果将有助于加深对中国东亚夏季风气候演变时空格局的认识。
An alpine wetland core was obtained to a depth of 4.0 m from the Fanjing Mountain in southwest China. Sections of the core were dated with14C data obtained with high resolution mass spectrometry (AMS), and Holocene climate changes were inferred by categorizing predominant tree and fern vegetation identified from pollen and spore counts at various core depths. The temperature increased during 11.9–8.0 cal ka BP, and the warmest period was during 8.0–4.6 cal ka BP. Then, it gradually became cooler during the late Holocene. Our temperature estimates were in good agreement with the previous studies of the Holocene temperature in the Asian monsoon areas. There were two relatively wet periods of 10.7–8.0 cal ka BP and 4.6–2.6 cal ka BP. There was an asynchronous precipitation trend in the south, north and southwest China, which was probably due to the different monsoon impacts. In East Asian summer monsoon (EASM) area, the monsoon precipitation gradually transgressed northward during the early to middle Holocene and regressed southward during the late Holocene. Our results will be useful to improve the understanding of the coherent spatio-temporal patterns of climate evolution in EASM region in China.