Inter-annual carbon isotope analysis of tree-rings by laser ablation
Inter-annual carbon isotope analysis of tree-rings by laser ablation
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DOI：
10.1016/j.chemgeo.2017.06.021
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发表时间：
2017-09-05
期刊：
影响因子：
3.9
通讯作者：
Grudd, H.
中科院分区：
文献类型：
--
作者：
Loader, N. J.;McCarroll, D.;Grudd, H.
使用传统方法对树木年轮进行稳定碳同位素分析，以用于环境、植物生理和考古方面的应用，有时会受到物理限制（年轮狭窄）或行政方面的考虑（非破坏性取样的要求）的限制，使研究人员无法获得具有科学价值的木材样本。通过激光烧蚀对这些档案进行分析，可能会解决这些问题，并为查阅受限档案提供便利。通过激光烧蚀进行分析所需的木材数量较少，因此与标准制备方法相比，该方法可以被认为是侵入性较小的，并且几乎是非破坏性的。其他地方报道的高水平的年内同位素变异性意味着单次测量可能无法忠实地代表年际同位素信号，因此在这种方法可以有信心地使用之前，有必要比较使用这两种方法产生的稳定碳同位素数据。本文报道了樟子松（Pinus sylvestris L.）使用改进的Schulze型激光烧蚀系统分析树木年轮，使用从相同树木年轮组制备的α-纤维素的常规手动取样和分析获得结果。激光采样系统被发现执行非常好，对既定的更具侵入性的方法。对于原始数据和Suess校正数据，在方法之间观察到高相关性（r > 0.90 n = 50）。这些结果突出了使用激光采样支持发展长期同位素年表，采样窄环或使用更详细的或劳动密集型的方法进行分析之前，预先筛选核心的潜力。
The stable carbon isotopic analysis of tree-rings for environmental, plant physiological and archaeological applications using conventional methods is occasionally limited by physical constraints (narrow rings) or administrative concerns (requirement for non-destructive sampling) that prevent researcher access to scientifically valuable wood samples. Analysis of such archives by laser-ablation can potentially address these issues and facilitate access to restricted archives. Smaller quantities of wood are required for analysis by laser ablation, hence the approach may be considered less-invasive and is virtually non-destructive compared to standard preparation methods. High levels of intra-annual isotopic variability reported elsewhere mean that a single measurement may not faithfully represent the inter-annual isotopic signal, so before such an approach can be used with confidence it is necessary to compare the stable carbon isotopic data produced using these two methods. This paper presents stable carbon isotope (delta C-13) data from the resin-extracted wood of dated Scots Pine (Pinus sylvestris L.) tree-rings analysed using a modified Schulze-type laser-ablation system with results obtained using conventional manual sampling and analysis of alpha-cellulose prepared from the same tree-ring groups. The laser sampling system is found to perform very well against established more invasive methods. High correlations are observed between the methods for both raw and Suess corrected data (r > 0.90 n = 50). These results highlight the potential for using laser-sampling to support the development of long isotope chronologies, for sampling narrow rings or for pre-screening cores prior to analysis using more detailed or labour intensive methods.