Stable isotopes in tree rings
Stable isotopes in tree rings
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DOI：
10.1016/j.quascirev.2003.06.017
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发表时间：
2004-04-01
影响因子：
4
通讯作者：
Loader, NJ
中科院分区：
文献类型：
--
作者：
McCarroll, D;Loader, NJ
树木年轮中的稳定同位素可以提供具有完美年分辨率和统计上确定的置信限的古气候重建。最近的进展使这种方法在非专业实验室中可行。然而，相关的文献分布在几个学科中，用不同的方法处理共同的问题。在这里，我们提供同位素树木气候学的第一个概述，解释潜在的理论和描述在建立和解释同位素年表所采取的步骤。稳定的碳同位素记录了气孔导度和光合速率之间的平衡，在干燥地点受相对湿度和土壤水分状况的支配，而在潮湿地点受夏季辐照度和温度的支配。稳定的氧和氢同位素比记录了水源水的温度信号和叶片蒸腾，主要由蒸汽压差控制。木材合成过程中与木质部（源）水的可变交换决定了源水和叶片富集信号的相对强度。制作长全新世年表需要将重点转向高效地处理大量样品，同时保持分析精度。使用了各种样品制备和数据处理方案，其中一些方案对古气候信号有不利影响。对这些问题进行了审查，并提出了采取更标准化方法的建议。(C) 2004 Elsevier Ltd.版权所有。
Stable isotopes in tree rings could provide palaeoclimate reconstructions with perfect annual resolution and statistically defined confidence limits. Recent advances make the approach viable for non-specialist laboratories. The relevant literature is, however, spread across several disciplines, with common problems approached in different ways. Here we provide the first overview of isotope dendroclimatology, explaining the underlying theory and describing the steps taken in building and interpreting isotope chronologies. Stable carbon isotopes record the balance between stomatal conductance and photosynthetic rate, dominated at dry sites by relative humidity and soil water status and at moist sites by summer irradiance and temperature. Stable oxygen and hydrogen isotopic ratios record source water, which contains a temperature signal, and leaf transpiration, controlled dominantly by vapour pressure deficit. Variable exchange with xylem (source) water during wood synthesis determines the relative strength of the source water and leaf enrichment signals. Producing long Holocene chronologies will require a change in emphasis towards processing very large numbers of samples efficiently, whilst retaining analytical precision. A variety of sample preparation and data treatment protocols have been used, some of which have a deleterious effect on the palaeoclimate signal. These are reviewed and suggestions made for a more standardised approach. (C) 2004 Elsevier Ltd. All rights reserved.