Late Quaternary environmental history of the south-eastern Tibetan Plateau inferred from the Lake Naleng non-pollen palynomorph record
Late Quaternary environmental history of the south-eastern Tibetan Plateau inferred from the Lake Naleng non-pollen palynomorph record
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DOI：
10.1007/s00334-009-0219-5
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发表时间：
2010-11-01
影响因子：
2.5
通讯作者：
Zhang, Chengjun
中科院分区：
文献类型：
--
作者：
Kramer, Annette;Herzschuh, Ulrike;Zhang, Chengjun
对青藏高原东南部淡水湖纳楞湖 17.81 m 沉积岩芯的非花粉孢粉型 (NPP) 成分进行了检查。在 160 个样品中确定了 15 个 NPP 和 3 种水生花粉类型的频率。由于几种 NPP 类型的起源仍不清楚，因此在相应化石花粉植物群发现的支持下进行了多变量分析，以提取有关其生态环境的信息。该分析允许将所有微化石分为四组环境响应，这提供了一种追踪自晚冰期（距今 17,700 年以来）以来该地区的湖泊历史和古气候变化的方法。重建了距今 14,600 年之前的晚冰期，湖泊条件不稳定，有机生产力低。陆地物质的大量投入。 Bolling/Allerod 区间的气候条件变得更加湿润，这表明该湖的生产力很高。经过短暂的气候恶化（距今 12,500-11,500 年）后，根据记录推断湖泊状况稳定。在全新世晚期（自距今 2,700 年以来），NPP 组成的变化可能与人类影响有关，后者是通过放牧指标的存在从花粉数据中推断出来的。
A 17.81 m sediment core from Lake Naleng, a freshwater lake in the south-eastern part of the Tibetan Plateau was examined for its non-pollen palynomorph (NPP) composition. The frequencies of 15 NPPs and three aquatic pollen types were determined in 160 samples. Since the origin of several NPP types is still unknown, multivariate analysis, supported by findings from the corresponding fossil pollen flora, was carried out to extract information about their ecological environments. The analysis allowed a classification of all microfossils in four groups of environmental response, which provided an approach to tracing lake history and palaeoclimatic changes in the area since the Late Glacial (since 17,700 cal years b.p.). Unstable lake conditions and a low organic productivity were reconstructed for the Late Glacial before 14,600 cal years b.p. with high inputs of terrestrial material. Climate conditions became wetter during the Bolling/Allerod interval indicated by high productivity in the lake. After a short climate deterioration (12,500-11,500 cal years b.p.), stable lake conditions were inferred from the record. During the late Holocene (since 2,700 cal years b.p.) changes in the NPP composition might be related to human impact, the latter being inferred from the pollen data through the presence of grazing indicators.