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通过对大兴安岭北部地区霍拉盆地泥炭剖面和表土样品的花粉分析,重建9100cal a BP以来植被演化历史及其对气候变化的响应过程.结果显示研究区植被经历了从早-中全新世暖温、寒温混合型植被向晚全新世寒温型植被的演变过程.全新世温暖期(9100~6000cal a BP),北大兴安岭寒温带针叶林区气候较现在更为温暖湿润,发育鹅耳枥属、榛属、松属和云杉属为主的暖温型针阔叶混交林,与寒温型落叶松和桦共同组成了特有的混交林地,其植被多样性增加.约6000~5000和3500~2500cal a BP的两次显著的降温事件,导致鹅耳枥属、榛属等喜暖植物类型减少,落叶松属和桦属为主的耐寒植被扩张.2500cal a BP之后,形成落叶松和桦为主的寒温型针阔叶混交林植被景观.全新世温暖期温度增加可能导致东亚夏季风对中国北大兴安岭地区的影响增强,有利于暖温型森林植被发育并增加植物载荷.
Based on the pollen analysis of the peat profile and topsoil samples from the Huolao Basin in northern Da Hinggan Mountains, the vegetation evolution history and its response to climate change since 9100 cal a BP were reconstructed.The results show that the vegetation in the study area experienced a series of changes from early warm to mid-Holocene, Cold temperate mixed vegetation to the Late Holocene cold temperate vegetation evolution process. Holocene warm period (9100 ~ 6000 cal a BP), North Greater Hinggan Leng frigid temperate coniferous forest climate is now more warm and humid, the development of hornbeam , Hazelnut, Pinus and Picea dominated by warm temperate coniferous and broadleaf mixed forest, and the cold-temperature larch and birch constitute a unique mixed forest, the diversity of vegetation increased about 6000 ~ 5000 and 3500 Two significant cooling events, ~ 2500 cal a BP, led to a decrease in the type of hi-warm plants such as Carpinus and Corydalis, and the expansion of cold-tolerant vegetation dominated by larch and Betula species. After 2500 cal a BP, larch and Betula Mainly in the cold temperate coniferous and broad-leaved mixed forest.The increase of warmth during the Holocene may lead to the increase of the impact of the East Asian summer monsoon on the Hinggan Mountains of North China, which is beneficial to the development of warm-temperate forest vegetation and increase the plant load.