Missing rings of Qilian juniper associated with drought on the Northeastern Tibetan Plateau, China

IF 2.7 3区 农林科学 Q1 FORESTRY Dendrochronologia Pub Date : 2023-10-01 DOI:10.1016/j.dendro.2023.126127
Xiaofeng Wang , Bao Yang , Liang Jiao , Miao Song , Xiang Chen , Tana Qian
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Abstract

A missing ring occurs when the radial growth of a tree is disturbed when the plant is under stress (e.g., extreme drought, fire, insect attack, frost) as a result of inhibition of cambial activities. Missing rings have been detected in several tree species in different parts of the world, and this phenomenon may be an indicator of imminent tree death. However, we still lack an in-depth understanding of the characteristics and causes of missing rings and their relationship with tree mortality. In this study, we examined missing ring occurrence in Qilian juniper (Juniperus przewalskii Kom.), one of the most long-lived tree species in China, growing in an extremely harsh environment on the Northeastern Tibetan Plateau. The results showed that the missing ring rate was sensitive to drought events during the period 1500–2000 AD, with extreme values of missing ring rate occurring in certain drought years, such as 1665, 1687, 1715, 1824, 1918, etc. In addition, climate warming in recent decades did not lead to an increase in the missing ring rate of Qilian juniper, which may be related to the improving regional water conditions on the plateau. The missing ring rate of Qilian juniper was related to the age of the tree, i.e., it increased first in younger trees and then decreased, with the highest missing ring rate occurring in trees about 800-years-old. Furthermore, trees that eventually died had a higher rate of missing rings before their death than those that survived, suggesting that missing rings have the potential to predict tree mortality. However, the relationship between tree mortality and missing ring rate is a very complex issue and requires further study.

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青藏高原东北部干旱导致祁连杜松年轮缺失
当植物受到压力(如极端干旱、火灾、虫害、霜冻)时,由于形成层活动受到抑制,树木的径向生长受到干扰,就会出现缺环。在世界不同地区的几种树种中发现了消失的年轮,这种现象可能是树木即将死亡的一个指标。然而,我们对年轮缺失的特征和原因及其与树木死亡率的关系仍然缺乏深入的了解。祁连杜松(Juniperus przewalskii Kom.)是中国最长寿的树种之一,生长在青藏高原东北部极其恶劣的环境中,本研究对祁连杜松(Juniperus przewalskii Kom.)的年轮缺失进行了研究。结果表明,1500 ~ 2000年干旱年份的缺环率较为敏感,在1665年、1687年、1715年、1824年、1918年等干旱年份,缺环率出现极值。此外,近几十年的气候变暖并未导致祁连杜松的缺环率增加,这可能与高原区域水条件的改善有关。祁连杜松的缺环率与树龄有关,在幼龄时先增加后降低,在800岁左右的树龄时缺环率最高。此外,最终死亡的树木在死亡前的年轮缺失率高于存活下来的树木,这表明年轮缺失有可能预测树木的死亡率。然而,树木死亡率与缺环率之间的关系是一个非常复杂的问题,需要进一步研究。
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来源期刊
Dendrochronologia
Dendrochronologia FORESTRY-GEOGRAPHY, PHYSICAL
CiteScore
5.50
自引率
13.30%
发文量
82
审稿时长
22.8 weeks
期刊介绍: Dendrochronologia is a peer-reviewed international scholarly journal that presents high-quality research related to growth rings of woody plants, i.e., trees and shrubs, and the application of tree-ring studies. The areas covered by the journal include, but are not limited to: Archaeology Botany Climatology Ecology Forestry Geology Hydrology Original research articles, reviews, communications, technical notes and personal notes are considered for publication.
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