Yellow-cedar blue intensity tree-ring chronologies as records of climate in Juneau, Alaska, USA

Yellow-cedar blue intensity tree-ring chronologies as records of climate in Juneau, Alaska, USA
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作为美国阿拉斯加州朱诺气候记录的黄-雪松蓝强度树轮年表

DOI:
10.1139/cjfr-2018-0525
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发表时间:
2019
影响因子:
2.2
通讯作者:
Oelkers, Rose
Oelkers, Rose
中科院分区:
农林科学3区
文献类型:
--
作者:
Wiles, Gregory C.;Charlton, Joshua;Wilson, Rob J.S.;D’Arrigo, Rosanne D.;Buma, Brian;Krapek, John;Gaglioti, Benjamin V.;Wiesenberg, Nicholas;Oelkers, Rose

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这是第一个研究,以产生和分析气候信号的蓝色强度(BI)树轮年表从阿拉斯加黄杉(Callitropsis nootkatensis(D。东。购自D. P. Little)。晚木BI年表显示出比年轮宽度更强的温度敏感性,因此可以提供过去气候的信息。在1900-1975年期间,BI年表显示出正的1 - 8月平均最高温度信号,之后在1976-1977年东北太平洋气候转变后,BI年表失去了温度敏感性。温度的正响应似乎正在恢复,并在最近几十年保持强劲,但未来几年将继续测试这一观测结果。从1976年到1999年左右,温度敏感性的暂时丧失在年轮宽度或森林健康变化方面并不明显,但与之前将雪松衰退与变暖联系起来的工作一致。混杂因素是心材-边材边界颜色变化的不确定影响。未来扩大黄雪松BI网络和进一步调查的影响,心材边材过渡的BI信号将导致更好地了解这个物种的效用作为气候代理。
This is the first study to generate and analyze the climate signal in blue intensity (BI) tree-ring chronologies from Alaska yellow-cedar (Callitropsis nootkatensis(D. Don) Oerst. ex D.P. Little). The latewood BI chronology shows a much stronger temperature sensitivity than ring width and can thus provide information on past climate. The well-replicated BI chronology exhibits a positive January–August mean maximum temperature signal for 1900–1975, after which it loses temperature sensitivity following the 1976–1977 shift in northeastern Pacific climate. The positive temperature response appears to recover and remains strong for the most recent decades, but the coming years will continue to test this observation. This temporary loss of temperature sensitivity from about 1976 to 1999 is not evident in ring width or in a change in forest health but is consistent with prior work linking cedar decline to warming. A confounding factor is the uncertain influence of a shift in color variation from the heartwood–sapwood boundary. Future expansion of the yellow-cedar BI network and further investigation of the influence of the heartwood–sapwood transitions in the BI signal will lead to a better understanding of the utility of this species as a climate proxy.
适应利用表层土壤中的硝酸盐会使黄雪松容易遭受气候引起的衰退,同时提高西部红雪松的生存率:一个新的假设。
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