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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Isotopic composition (δ13C, δ18O) in wood and cellulose of Siberian larch trees for early Medieval and recent periods
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Isotopic composition (δ13C, δ18O) in wood and cellulose of Siberian larch trees for early Medieval and recent periods

机译：中世纪早期和近期西伯利亚落叶松树木材和纤维素中的同位素组成（δ13C，δ18O）

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摘要

We related tree ring width (TRW) and isotopic composition (δ 13C, δ 18O) of wood and cellulose from four larch trees (Larix cajanderi Mayr.) to climate parameters. The material was sampled in northeastern Yakutia [70°N–148°E] for the recent (AD 1880–2004) and early Medieval (AD 900–1000) periods. During the recent period June, July, and August air temperatures were positively correlated with δ 13C and δ 18O of wood and cellulose, while July precipitation was negatively correlated. Furthermore, the vapor pressure deficit (VPD) of July and August was significantly correlated with δ 13C of wood and cellulose, but VPD had almost no influence on δ 18O. Comparative analyses between mean isotope values for the (AD 900–1000) and (AD 1880–2004) periods indicate similar ranges of climatic conditions, with the exception of the period AD 1950–2004. While isotopic ratios in cellulose are reliably related to climatic variables, during some periods those in whole wood showed even stronger relationships. Strong positive correlations between δ 18O of cellulose and Greenland ice-core (GISP2) data were detected for the beginning of the Medieval period (r = 0.86; p < 0.05), indicating the reliability of isotope signals in tree rings for large-scale reconstructions.
机译：我们将来自四棵落叶松树（Larix cajanderi Mayr。）的木材和纤维素的年轮宽度（TRW）和同位素组成（δ13C，δ18O）与气候参数相关。在最近（公元1880-2004年）和中世纪早期（公元900-1000年）期间，在东北亚库特[70°N–148°E]采样了该材料。在最近的六月，七月和八月期间，气温与木材和纤维素的δ13C和δ18O正相关，而七月的降水则呈负相关。此外，7月和8月的蒸气压亏缺（VPD）与木材和纤维素的δ13C显着相关，但VPD对δ18O几乎没有影响。 （AD 900–1000）和（AD 1880–2004）时期的平均同位素值之间的比较分析表明，除1950–2004年时期外，气候条件范围相似。尽管纤维素中的同位素比率与气候变量确实相关，但在某些时期中，全木材中的同位素比率甚至显示出更强的关系。在中世纪开始时，检测到纤维素的δ18O与格陵兰冰芯（GISP2）数据之间的强正相关性（r = 0.86; p <0.05），这表明大重建中树环中同位素信号的可靠性。

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