青藏高原东部若尔盖盆地全新世泥炭地发育和植被变化

发布时间：2018-10-14 13:08

【摘要】：泥炭沉积物和泥炭地演化过程可以提供植被和气候变化历史的丰富信息.为了重建青藏高原东部全新世泥炭地发育、植被和气候变化,我们对若尔盖盆地一支泥炭岩芯进行了高分辨率的孢粉、烧失量和碳沉积速率分析.研究结果显示,当地泥炭发育起始于距今10.3ka,在早、中全新世繁盛,之后开始退化.若尔盖盆地全新世植被以高山草甸为主,周边山地针叶林在10.5~4.6ka曾数次扩张,之后迅速退缩.泥炭性质、孢粉组合主成分分析等揭示了研究区10~5.5ka气候温暖湿润,晚全新世气候相对冷干.其中,10.2~10、9.7~9.5、8.7~8.5、7.7~7.4、6.4~6、5.5~5.2、4.8~4.5、4~3.6、3.1~2.7、1.4~1.2和0.8~0.6ka时段,若尔盖地区发生了多次快速的泥炭地退化、针叶林扩张和气候变冷等事件.青藏高原东部地区全新世植被与气候的长期变化受控于太阳辐射及其主导的温度与亚洲夏季风强度的变化,而百年尺度的快速变化事件可能受到了季风减弱事件和北半球高纬度地区温度异常的调制作用.
[Abstract]:The evolution of peat sediments and peat fields can provide rich information on vegetation and climate change history. In order to reconstruct the Holocene peat land development, vegetation and climate change in the eastern Qinghai-Xizang Plateau, a peat core in the Zoergai Basin was analyzed with high resolution sporopollen, loss of fire and carbon deposition rate. The results showed that the peat development began at 10.3kaago and flourished in early and middle Holocene, and then began to degenerate. The Holocene vegetation in the Ruoergai Basin was dominated by alpine meadows, and the surrounding mountain coniferous forests expanded several times in 10.5~4.6ka, then retreated rapidly. The properties of peat and the principal component analysis of sporopollen assemblage revealed that the climate of 10~5.5ka was warm and humid, and the climate of late Holocene was relatively cold and dry. Among them, 10.2 ~ 10 ~ (10) ~ (9. 7) 9. 5 ~ 8. 7 ~ 8. 5 ~ 6 ~ 6 ~ 6 ~ 6 ~ 5 ~ 5 ~ 5 ~ 5 ~ 4 ~ 4 ~ 4 ~ 4 ~ 4 ~ 4 ~ 4 ~ 4 ~ 4 ~ 4 ~ (5) ~ 4 ~ (5) ~ 4 ~ 4 ~ 4 ~ 3 ~ (-1) ~ 3. 1 / 1 ~ (4) ~ (1) ~ (-1) ~ (1.4) ~ 1.2.2.1.2.2.1.2.1.2. in Ruoergai area, there were many rapid peat land degradation, coniferous Long-term changes in Holocene vegetation and climate in the eastern part of the Qinghai-Tibet Plateau are controlled by changes in solar radiation, its dominant temperature, and the intensity of the Asian summer monsoon. The rapid change of the century-scale events may be modulated by the monsoon weakening events and the temperature anomalies in the high latitudes of the Northern Hemisphere.
【作者单位】：中国科学院地理科学与资源研究所陆地表层格局与模拟院重点实验室;中国科学院大学;
【基金】：国家重点研发计划项目(编号:2016YFA0600501) 国家自然科学基金项目(批准号:41471169、41330105、41102221、41690113、41401228) 中国科学院战略性先导科技专项项目(B类)(编号:XDB03030103)资助
【分类号】：P534.632;Q914

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