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Palynological records of environmental changes in the middle part of Inner Mongolia, China

机译：内蒙古中部地区环境变化的孢粉记录

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A 2.4-m-long core was extracted from Diaojiao Lake (41°18'N, 112°21'E) at the foot of the northern part of Daqingshan Mts. High-resolution pollen analysis results of two sites showed 10 arboreal genera, including Pinus, Betula, Picea, Abies, Carpinus, Quercus, Ulmus and more than 20 non-arboreal genera, mainly of Artemisia, Labiatae, Nitraria, Polygonaceae, Ranunculus, Thalictrum, Umbelliferae, Cary-ophyllaceae and Cyperaceae dominating the record. Fern spores, aquatic pollen and algae were also observed in some sections of the cores. The sequence was divided strati-graphically into six pollen assemblage zones by a strati-graphically-constrained cluster analysis using an incremental sum of squares method. The vegetation underwent the following stage changes: steppe with sparse trees, steppe, forest, and steppe. During the middle Holocene, a mixed forest of Pinus, Betula and Quercus occurred on the mountainous areas, and Pinus forest dominated the frontal plains. Six climatic stages were inferred from total pollen flux and pollen percentage from the two sites using a transfer function: humid-cool (10000 — 7800 aBP), arid-cold (9200 — 7800 aBP), arid-warm (7800 — 7100 aBP), humid-warm (7100 — 4400 aBP), arid-warm (4400 — 3000 aBP), arid-cold (3000 — 2100 aBP) phases were identified.
机译：从大青山山北麓的刁角湖（北纬41°18'，东经112°21'）提取了一个2.4米长的岩心。两个地点的高分辨率花粉分析结果显示，有10个乔木属，包括松，桦，云杉，冷杉，ies木，栎，乌尔姆斯和20多个非乔木属，主要是蒿，唇形科，白屈菜，Poly科，毛an属，Thalictrum记录中以伞形科，伞形科，莎草科和莎草科为主。在岩心的某些部分还观察到了蕨类孢子，水生花粉和藻类。使用平方和增量法，通过地层约束聚类分析，将该序列在地层上划分为六个花粉组合区。植被经历了以下阶段变化：稀疏的草原，草原，森林和草原。在全新世中期，山区出现了松树，桦树和栎的混交林，而松树林则占据了前平原。使用传递函数，从两个站点的总花粉通量和花粉百分比推断出六个气候阶段：湿冷（10000-7800 aBP），干旱冷（9200-7800 aBP），干旱暖（7800-7100 aBP）确定了高温，暖湿（7100-4400 aBP），干旱-暖（4400-3000 aBP），干旱-冷（3000-2100 aBP）相。

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