The early Holocene optimum inferred from a high-resolution pollen record of Huguangyan Maar Lake in southern China
The early Holocene optimum inferred from a high-resolution pollen record of Huguangyan Maar Lake in southern China
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DOI：
10.1007/s11434-007-0419-2
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发表时间：
2007-10
影响因子：
--
通讯作者：
Shu-Yu Wang;Houyuan Lü;Jia-qi Liu;J. Negendank
中科院分区：
文献类型：
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作者：
Shu-Yu Wang;Houyuan Lü;Jia-qi Liu;J. Negendank
湖光岩玛珥湖近13000年的高分辨率花粉记录揭示了全新世中国南方植被和环境的变化。结果表明：(i)全新世早期(11600~7800 cal a BP)乔灌木花粉百分率达到56%，其中热带乔木花粉百分率在9500~8000 cal a BP时达到最大值，反映了湿热环境； (ii) 全新世中期（7800-4200 cal a BP），山地针叶树和草本植物的花粉百分比增加，而热带亚热带树木的百分比下降，表明温度和湿度较低； (iii)在全新世晚期，从4200cal a BP到350cal a BP，草本植物和山地针叶树的花粉百分比显着增加，表明温度和湿度显着下降。我们的花粉数据表明，中国南方的9500-8000 cal a BP时期代表了全新世的气候最佳时期，其特点是炎热和潮湿。这与全球低纬度地区发现的全新世最佳状态一致。我们推测，强烈的日照可能导致热带季风带和副热带夏季风锋向北迁移，从而导致湖光岩地区出现全新世早期的最适宜气候。全新世中晚期的干旱趋势和气候波动可能与日照减少和ENSO事件频繁有关。
A high-resolution pollen record of the past 13000 a from Huguangyan Maar Lake reveals the vegetation and environment changes in southern China during the Holocene. It shows that (i) pollen percentage of trees and shrubs reached 56% during the early Holocene (11600–7800 cal a BP), of which the pollen percentage of tropical trees reached a maximum at 9500-8000 cal a BP, reflecting a hot and wet environment; (ii) during the mid-Holocene (7800–4200 cal a BP), the pollen percentage of montane coniferous trees and herbs increased, while the percentage of tropical-subtropical trees decreased, indicating lower temperature and humidity; (iii) in the late Holocene spanning from 4200 to 350 cal a BP, the pollen percentage of herbs and montane conifer increased significantly, indicating a marked decrease of temperature and humidity. Our pollen data reveal that the time period 9500–8000 cal a BP in southern China represents a climatic optimum for the Holocene characterized by hot and wet conditions. This is consistent with the Holocene optimum found in lower latitude regions globally. We speculate that strong insolation might cause the northward migration of the ITCZ and subtropical summer monsoon front, which resulted in an early Holocene optimum in the Huguangyan area. The dry tendency and climate fluctuations of the middle and late Holocene could be associated with a decrease in solar insolation and frequent ENSO event.