青藏高原中晚全新世人类活动的孢粉记录

依据前人研究成果，本文从国内外已发表的文献中搜集高原地层孢粉序列，遴选可靠记录，以期探讨该区的人类活动信息。选取原则为：（1）孢粉序列时间需涵盖中晚全新世（6.0kaBP.以来）；（2）具有较好年代控制，序列以日历年或14C年时间体系定量表达；（3）具有较高的分辨率；（4）序列地域分布需覆盖整个高原及其各分区。根据上述原则，选取了本区28条地层化石孢粉序列。年代校正：28条序列中有些为日历年有些为碳14测年，因此对其进行校正成日历年。数据获取：对序列进行定量化，读取序列的孢粉含量数值与对应年代，为保证数据的有效性，优先选取拐点数据，序列分辨不足100年的时段，选取该时段平均的孢粉含量数据。从28条序列中共获取568条伴人孢粉记录。利用青藏高原28处地点的地层化石孢粉数据，提取计算并合成本区中晚全新世以来（6.0~2.0kaB.P.）的伴人孢粉记录。对从28处地层化石孢粉序列中提取的原始伴人孢粉记录，以序列为单位，运用离差法进行标准化处理，目的在于消除不同孢粉类型间的量纲差异，相互间可以进行对比，经标准化后的原始数据转换为标准化数值。然后计算每个分区每条记录的平均值，从而合成本区伴人孢粉记录，本文称其为伴人指数，其含义为指数愈高人类活动强度愈强，愈低则愈弱。

Based on previous research results, this paper collects plateau stratigraphic pollen sequences from published literature at home and abroad, and selects reliable records to explore human activity information in this region. The selection criteria are as follows: (1) The time span of the pollen sequences must cover the Mid-Late Holocene (since 6.0 ka BP); (2) Good chronological control is required, and the sequences are quantitatively expressed using the calendar year or 14C-dated time system; (3) High temporal resolution; (4) The geographical distribution of the sequences must cover the entire plateau and its sub-regions. According to the above criteria, 28 stratigraphic fossil pollen sequences in this region were selected. Chronology correction: Some of the 28 sequences are dated by calendar years while others are radiocarbon-dated, so we corrected all of them to calendar years. Data acquisition: Quantify the sequences, read the pollen content values and corresponding ages. To ensure data validity, we prioritize inflection point data; for time periods with a sequence resolution of less than 100 years, we select the average pollen content data of that period. A total of 568 anthropophilic pollen records were obtained from the 28 sequences. Using the stratigraphic fossil pollen data from 28 sites on the Tibetan Plateau, we extracted, calculated and synthesized the anthropophilic pollen records in this region since the Mid-Late Holocene (6.0–2.0 ka BP). For the original anthropophilic pollen records extracted from the 28 stratigraphic fossil pollen sequences, we performed standardization processing using the deviation method on a per-sequence basis, aiming to eliminate the dimensional differences between different pollen types and enable mutual comparison. The standardized original data were converted into standardized values. Then we calculated the average value of each record in each sub-region, thereby synthesizing the anthropophilic pollen records in this region, which is termed the anthropogenic index in this paper. The meaning of this index is that the higher the index, the stronger the intensity of human activities, and the lower the index, the weaker the intensity.

搜集汇总

背景与挑战

背景概述

该数据集汇集了青藏高原中晚全新世（距今6000-2000年）的28条地层化石孢粉序列，通过标准化处理生成伴人指数以量化人类活动强度。数据以Excel格式存储，包含多个工作表，涵盖不同地区和指标，为研究青藏高原古环境与人类活动关系提供了重要资料。