摘要
以14C测年为基础,构建了天湖山泥炭剖面的年代序列,通过对研究区泥炭腐殖化度与有机质的分析研究,发现两者呈现出很好的相关性,共同记录了研究区约9.5 ka BP以来的气候变化,可划分出3个主要阶段:1)早期(9.5 ka BP～6.3 ka BP)泥炭腐殖化度最低,指示气候湿热,其中7.9 ka BP～6.3 ka BP为整个剖面腐殖化度最低值阶段,可能为研究区全新世气候最适宜期(全新世大暖期)阶段;2)中期(6.3 ka BP～2.8 ka BP)泥炭腐殖化度较低,指示气候温凉湿润;3)晚期(2.8 ka BP以来),泥炭腐殖化度偏高,波动较大,指示气候温凉偏干.利用redfit红色噪声谱分析发现,有机质含量变化时间序列中存在948 a、268 a、342a的准周期,反映了中低纬度亚热带季风区气候变化对太阳活动的响应.
The age series of a peat profile at Tianhu Mountain in northern Fujian province was construtted on the basis of radiocarbon date. The geography location of the profile in the southern subtropic is sensitive to global climate changes. The age series shows that the peat profile formed mainly since 9. 5ka BP. According to the analysis of the peat humification and organic content of the profile, we find that both of the proxies show well correlation and make a clear identification of climatic shifts in Holocene. Holocene climate changes can be divided into three phases in the region ： 1 ） lower humification phase （9.5 ka BP-6. 3 ka BP） with the lowest during 7.9 ka BP-6.3 ka BP, which suggests hot and moist climate, and may be corresponding to the Holocene optimum of the studied area ; 2） low humification phase （6.3 ka BP -2. 8 ka BP）, indicating a warm and moist climate state; 3） the latest phase （since 2. 8 ka BP） of high humification with large fluctuation, reflecting a dry and cool climate condition. In addition, using red noise spectrum analysis with the redfit 3.8 organic record show some aquasi-periods of 948 a, 268 a, 342 a consistent with solar activity cycles, which suggested that summer monsoon climate change was probably sensitive to the secular solar activity.
出处
《亚热带资源与环境学报》
2011年第3期31-39,共9页
Journal of Subtropical Resources and Environment
基金
福建省公益类科研院所专项基金(2010R1037-3)
关键词
泥炭
腐殖化度
全新世
古气候
福建天湖山
peat
humification
Holocene
paleaoclimate
Tianhu Mountain in Fujian province
