Abstract This study reconstructed the vegetation dynamics and associated climate change of the past ~4100 years based on the pollen data from a short peat core (i.e., KLSZ-2) in Kelashazi Peat (48.12°N, 88.37°E, 2422 m a.s.l.) in the Altai Mountains. The reconstructed vegetation and climate were then stacked with those from a longer peat core (i.e., KLSZ-1) to evaluate the vegetation dynamics and associated climate change of the entire Holocene and to examine the δ13Ccellulose- and δ18Ocellulose-based temperature reconstructions in the same peat. This study shows that vegetation in Kelashazi valley was dominated by alpine meadows before ~8200 cal. yr BP, by taiga forests at ~8200-~5600 cal. yr BP, and by an expansion of alpine meadows since ~5600 cal. yr BP. This study also examined the vegetation dynamics and associated climate in the context of the entire Altai Mountains and the surrounding areas. Our examination suggests that the forest expansion in high elevations was initiated when the temperature reached a threshold level during the early Holocene, and the forest expansion in low elevations (i.e., below the down treeline) was initiated when the moisture reached a threshold level during the middle Holocene or even late Holocene. It is also notable that the forest expansion at low elevations appears to have been longitude-dependent, i.e., time transgressive eastward. A possible mechanism to explain the longitude-dependency is that a gradual shrinking trend of the Siberian High linked to the Holocene increase in winter insolation allowed the domination of the water vapor-enriched Westerlies to gradually encroach eastward.

中文翻译：

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中亚干旱地区阿尔泰山脉全新世植被动态及相关气候变化

摘要 本研究基于克拉拉兹泥炭（48.12°N, 88.37°E, 2422 m asl）的短泥炭核心（即KLSZ-2）的花粉数据重建了过去~4100年的植被动态和相关的气候变化在阿尔泰山脉。然后将重建的植被和气候与来自较长泥炭核心（即 KLSZ-1）的植被和气候叠加，以评估整个全新世的植被动态和相关气候变化，并检查基于 δ13C 纤维素和 δ18O 纤维素的温度重建。泥炭。该研究表明，在~8200 cal之前，克拉拉孜河谷的植被以高山草甸为主。年 BP，来自约 8200-~5600 卡路里的针叶林。年 BP，以及自 5600 卡路里以来高山草甸的扩张。年 BP。本研究还研究了整个阿尔泰山脉及其周边地区的植被动态和相关气候。我们的研究表明，高海拔的森林扩张是在全新世早期温度达到阈值水平时开始的，而低海拔（即树下线以下）的森林扩张是在新世早期湿度达到阈值水平时开始的。全新世中期甚至全新世晚期。还值得注意的是，低海拔的森林扩张似乎与经度有关，即时间越过东移。