Towards mapping the late Quaternary vegetation change of Europe
Towards mapping the late Quaternary vegetation change of Europe
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DOI：
10.1007/s00334-012-0390-y
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发表时间：
2014-01-01
影响因子：
2.5
通讯作者：
Bradshaw, Richard H. W.
中科院分区：
文献类型：
--
作者：
Giesecke, Thomas;Davis, Basil;Bradshaw, Richard H. W.
在过去的30年里，欧洲的花粉图数量大大增加，其中许多已提交给欧洲花粉数据库（EPD）。这使得在整个大陆上构建越来越精确的全新世植被变化地图成为可能。EPD中的年表信息以未校准的放射性碳年表示，迄今为止大多数年表都是基于这个时间尺度。在这里，我们提出了新的年表的基础上校准的放射性碳年存储在环保署的数据集。与花粉图解相关的年龄信息通常来自花粉地层学本身或其他沉积学信息。我们审查了这些时间关系点，并将不确定性分配给它们。介绍了产生新年表所采取的步骤，并介绍了新的年龄不确定性分类系统的基本原理。由此产生的年表适合大多数大陆规模的问题。它们可能不会为特定网站提供最佳的年龄模型，但可以被视为通用年表。分类学的特殊性的数据存储在环保署的解释。一个例子是如何查询数据库，以选择样本与适当的年龄控制以及合适的分类水平，以回答一个特定的研究问题。
The number of well-dated pollen diagrams in Europe has increased considerably over the last 30 years and many of them have been submitted to the European Pollen Database (EPD). This allows for the construction of increasingly precise maps of Holocene vegetation change across the continent. Chronological information in the EPD has been expressed in uncalibrated radiocarbon years, and most chronologies to date are based on this time scale. Here we present new chronologies for most of the datasets stored in the EPD based on calibrated radiocarbon years. Age information associated with pollen diagrams is often derived from the pollen stratigraphy itself or from other sedimentological information. We reviewed these chronological tie points and assigned uncertainties to them. The steps taken to generate the new chronologies are described and the rationale for a new classification system for age uncertainties is introduced. The resulting chronologies are fit for most continental-scale questions. They may not provide the best age model for particular sites, but may be viewed as general purpose chronologies. Taxonomic particularities of the data stored in the EPD are explained. An example is given of how the database can be queried to select samples with appropriate age control as well as the suitable taxonomic level to answer a specific research question.