Short-lived juvenile effects observed in stable carbon and oxygen isotopes of UK oak trees and historic building timbers
Short-lived juvenile effects observed in stable carbon and oxygen isotopes of UK oak trees and historic building timbers
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DOI：
10.1016/j.chemgeo.2017.09.007
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发表时间：
2017-11-15
期刊：
影响因子：
3.9
通讯作者：
Young, Giles H. F.
中科院分区：
文献类型：
--
作者：
Duffy, Josie E.;McCarroll, Danny;Young, Giles H. F.
本文测定了栎（Quercus robur L.）petraea Liebl.）活树和历史建筑木材的样本。这代表了可用于制作包括英国和爱尔兰在内的西北欧长树轮年表的材料类型。结果从少年年轮，那些位于最接近的髓，进行了比较，从独立的主同位素年表，不包含任何少年木材，允许任何少年偏移和趋势，从那些由环境变化引起的等同部分（代表相同的日历年）的结果。来自考古学来源的橡木木材通常相对较短（< 100年）。因此，去除前50个年轮，这是典型的松树，将严重限制可用于年表构建的材料。本研究的目的是确定青少年效应的幅度和持续时间，包括检测趋势，偏移及其对信号强度的影响。结果清楚地表明，少年的影响，从英格兰中部的橡树是非常小的和短暂的，仅仅删除前五个环最接近的髓是足以避免他们。这一结果极大地增加了使用历史建筑木材的存档橡木样本建立长期和良好复制的稳定同位素年表的潜力，允许为人口稠密的地区生产高分辨率的气候重建，其中橡木丰富，目前在区域古气候重建中代表性不足。
Stable carbon (delta C-13) and oxygen (delta O-18) isotope ratios were measured on the latewood alpha-cellulose of individual oak (Quercus robur L, Q. petraea Liebl.) samples from living trees and historic building timbers. This represents the type of material available to produce long tree-ring chronologies for north-western Europe including the UK and Ireland. Results from the juvenile rings, those located closest to the pith, were compared with results from equivalent sections (representing the same calendar years) from independent master isotope chronologies that do not contain any juvenile wood, allowing any juvenile offsets and trends to be separated from those caused by environmental change. Oak timbers from archaeological sources are often relatively short (< 100 years). Therefore, removing the first 50 rings, as is typical for Pinus sp., would severely constrain the material available for chronology construction. The aim of this study was to determine the magnitude and duration of juvenile effects, including the detection of trends, offsets and their influence upon signal strength. The results show clearly that juvenile effects for oak from central England are very small and short-lived and that removing merely the first five rings closest to the pith is sufficient to avoid them. This result greatly increases the potential for building long and well-replicated stable isotope chronologies using archived oak samples from historic building timbers, allowing high-resolution climate reconstructions to be produced for the highly-populated regions, where oak is abundant and which are currently under-represented in regional palaeoclimate reconstructions.