Sampling strategy and climatic implication of tree-ring cellulose oxygen isotopes of Hippophae tibetana and Abies georgei on the southeastern Tibetan Plateau
Sampling strategy and climatic implication of tree-ring cellulose oxygen isotopes of Hippophae tibetana and Abies georgei on the southeastern Tibetan Plateau
复制标题
青藏高原东南部藏沙棘和冷杉树轮纤维素氧同位素采样策略及气候意义
DOI：
10.1007/s00484-017-1365-6
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发表时间：
2017
影响因子：
3.2
通讯作者：
Guo Zhengtang
中科院分区：
文献类型：
--
作者：
Xu Chenxi;Zhu Haifeng;Nakatsuka Takeshi;Sano Masaki;Li Zhen;Shi Feng;Liang Eryuan;Guo Zhengtang
利用1951 - 2010年生长在青藏高原东南部新厝地区的4株西藏沙棘和4株乔治冷杉的树轮纤维素氧同位素（δ 18 O），探讨其重建青藏高原东南部气候变化的潜力。树轮δ 18 O在不同高度的平均值和标准差差异不显著，靠近小溪的树木与冰碛顶部的树木之间的平均值和标准差差异不显著，表明无论取样高度如何，都可以采集到树轮δ 18 O分析样品，而且微环境对树木生长没有影响。δ 18 O环显著。纤维素δ 18 O的系列间相关系数为A.乔治H. Tibetana的δ 18 O值为0.84/0.93，A.乔治和H.西藏0.92。树间和种间纤维素δ 18 O之间的良好一致性表明，使用不同的物种来开发一个长的年表的可能性。树轮δ 18 O与气候参数的相关分析表明，A.乔治H. 7 - 8月西藏的δ 18 O与相对湿度呈负相关（r=-0.62/r=-0.69），空间相关性分析表明，西藏的δ 18 O与相对湿度呈负相关（r=-0.62/r=-0.69）。乔治H.西藏反映了区域标准化降水蒸散指数（29° ~ 32 ° N，88° ~ 98 ° E）。另外，新措的树轮δ 18 O与不丹的树轮δ 18 O具有显著的相关性。结果表明：A.乔治和H.西藏新措是区域水文气候的良好代表。
The tree-ring cellulose oxygen isotopes (δ18O) for four trees ofHippophae tibetanaand four trees ofAbies georgeigrowing in different locations around the terminal moraine in Xincuo from 1951 to 2010 were measured to explore its potential for reconstructing climatic variations in the southeastern Tibetan Plateau. The mean and standard deviation of tree-ring δ18O at different heights do not have significant differences, and there are no significant differences in the mean and standard deviation of tree-ring δ18O between trees near the brook and trees at the top of moraine, indicating that we can collect samples for tree-ring δ18O analysis regardless of sampling heights and that the micro-environment does not affect tree-ring δ18O significantly. The mean inter-series correlations of cellulose δ18O forA. georgei/H. tibetanaare 0.84/0.93, and the correlation between δ18O forA. georgeiandH. tibetanais 0.92. The good coherence between inter-tree and inter-species cellulose δ18O demonstrates the possibility of using different species to develop a long chronology. Correlation analysis between tree-ring δ18O and climate parameters revealed that δ18O forA. georgei/H. tibetanahad negative correlations (r= −0.62/r= −0.69) with relative humidity in July–August, and spatial correlation revealed that δ18O forA. georgei/H. tibetanareflected the regional Standardized Precipitation Evapotranspiration Index (29°–32° N, 88°–98° E). In addition, tree-ring δ18O in Xincuo has a significant correlation with tree-ring δ18O in Bhutan. The results indicate that cellulose δ18O forA. georgeiandH. tibetanain Xincuo is a good proxy for the regional hydroclimate.