ENVIRONMENTAL VARIATIONS IN DINGXI REGION IN THE LOESS PLATEAU,CHINA OVER THE PAST 15 000 YEARS
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摘要: 根据鲁家沟黄土剖面粒度、磁化率、有机质和碳酸盐含量等气候代用指标的变化和14C测年结果,分析和讨论了定西地区近15 cal.kaBP以来气候演化的过程。结果表明15 cal.kaBP以来的气候变化可划分为4个阶段:(1)末次冰期晚期(14 900~11 200 cal.aBP),气候较为寒冷干旱;(2)全新世早期(11 200~7 560 cal.aBP),气候开始转暖转湿,但整体上较为寒冷;(3)全新世中期(7 560~3 600 cal.aBP),气候温暖湿润,夏季风强盛;(4)全新世晚期(3 600~1 200 cal.aBP),气候变得干旱,夏季风强烈减退,风尘堆积旺盛,形成了现代黄土和表土层。该区末次冰期晚期以来的环境变化是不稳定的,气候存在频繁次级波动。1 500~1 200 cal.aBP的晚全新世期间,有机质含量出现峰值,表明气候总体向干旱化发展的同时,叠加了人类活动的影响。Abstract: The paleoenvironment is established by analysis of grain size,magnetic susceptibility,organic matter and carbonate content of the sediments at Lujiagou section, Dingxi in Gansu Province and 14C dating.The results from climatic indexes from the section show that climatic changes in the past 14 900 cal.aBP were instable in this area and can be divided into four periods:the last late-glacial(14 900~11 200 cal.aBP) during which the climate was still cold and dry; the early Holocene(11 200~7 560 cal.aBP)with summer monsoon strengthening and the climate becoming warmer and wetter; warm and wet climate dominated the middle Holocene (7 560~3 600 cal.aBP);the late Holocene(3 600~1 200 cal.aBP)when the climate became drier and cooler and the dust-fall was strengthening. Four paleosoils were formed, whose dating was 10 100~8 000,4 350~4 100,3 900~3 700, and 2 800~2 560 cal.aBP respectively.
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Key words:
- environmental variations /
- Holocene /
- Dingxi /
- the Loess Plateau
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