TROPICAL GEOGRAPHY ›› 2016, Vol. 36 ›› Issue (3): 477-485.doi: 10.13284/j.cnki.rddl.002855

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Holocene Climate Records from a Mountain Wetland in Luoxiao Ranges

HAN Aiyana,ZENG Lifenga,HUANG Kangyoua,c,LIAO Wenbob,ZHENG Zhuoa,CHEN Conga   

  1. (a.School of Earth Science and Geological Engineering;b.School of Life Sciences;c.Guangdong Provincial Key Laboratory of Mineral Resources & Geological Processes,Sun Yet-san University,Guangzhou 510275,China)
  • Online:2016-05-05 Published:2016-05-05

Abstract: A 150 cm core (JXA) was drilled from a mountain wetland in Jiangxi’ao, Jinggang Mountains in the southeast of mid-subtropical Luoxiao Ranges. Paleoenviromental proxies, such as loss-on-ignition (LOI), humification, organic carbon isotopic and grayscale were used to reconstruct the climatic evolution history in the study area. Based on 6 AMS 14C dating, the age of the sediment at the bottom of the core was ~11 cal. ka B.P.. The sedimentation process could be divided into four stages: 1) During the ages between 11 and 9.2 cal. ka B.P., the content of organic carbon was low and carbon isotopes were characteristic of C3 plants. The climate was relatively cool and dry; 2) in the period of 9.2–5.3 cal. ka B.P., the forest vegetation expanded according to carbon isotope, organic carbon and humification information. The peat land began to develop rapidly, and a warm and humid climate, which corresponded well to the Holocene optimum, was speculated; 3) at 5.3–2.2 cal. ka B.P., the carbon isotope curve showed changes in vegetation components between C3 and C4 plants. The climate was cool and dry; 4) during 2.2–0 cal. ka B.P., the monsoon activity tended to enhance, and the environment was possibly interfered by agricultural activities. The present study provides new paleoclimate evidence in subtropical regions, and indicated the Holocene optimum is between 9.2 and 5.3 cal. ka B.P.. The driving mechanism is mainly controlled by the insolation intensity in the northern hemisphere and summer monsoon variability.

Key words: climate change, Luoxiao Mountains, mountain wetland, Holocene, Carbon Isotope