Isotopic composition (δ13C, δ18O) in wood and cellulose of Siberian larch trees for early Medieval and recent periods
Isotopic composition (δ13C, δ18O) in wood and cellulose of Siberian larch trees for early Medieval and recent periods
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中世纪早期和近代西伯利亚落叶松木材和纤维素的同位素组成（δ13C、δ18O）
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发表时间：
2008
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通讯作者：
E. Vaganov
中科院分区：
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作者：
O. Sidorova;R. Siegwolf;M. Saurer;M. M. Naurzbaev;E. Vaganov
[1]对4种落叶松（Larixcajanderi Mayr.）木材和纤维素的年轮宽度（TRW）和同位素组成（δ 13 C，δ 18 O）进行了测定。气候参数。这些材料是在雅库特东北部[70°N-148°E]为近代（公元1880-2004年）和中世纪早期（公元900-1000年）采集的。近期6、7、8月气温与木材和纤维素的δ 13 C和δ 18 O呈显著正相关，7月降水量与δ 13 C和δ 18 O呈显著负相关。7月和8月的水汽压亏缺（VPD）与木材和纤维素的δ 13 C呈显著正相关，而对δ 18 O几乎没有影响。对（公元900-1000年）和（公元1880-2004年）时期的平均同位素值进行比较分析表明，除公元1950-2004年期间外，气候条件的范围相似。虽然纤维素中的同位素比率与气候变量可靠相关，但在某些时期，整棵木材中的同位素比率表现出更强的关系。纤维素的δ 18 O和格陵兰冰芯（GISP 2）数据之间的强正相关性被检测到的中世纪时期的开始（r = 0.86; p < 0.05），表明在大规模重建树木年轮的同位素信号的可靠性。
[1] We related tree ring width (TRW) and isotopic composition (δ13C, δ18O) of wood and cellulose from four larch trees (Larixcajanderi 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 δ13C and δ18O of wood and cellulose, while July precipitation was negatively correlated. Furthermore, the vapor pressure deficit (VPD) of July and August was significantly correlated with δ13C of wood and cellulose, but VPD had almost no influence on δ18O. 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 δ18O 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.