Dendrochronologia最新文献_第10页

Aspects of different growth responses of coniferous and broadleaved tree species in landslide research 滑坡研究中针叶树和阔叶树不同生长响应的方面

IF 2.7 3区农林科学 Q1 FORESTRY

Dendrochronologia

Pub Date : 2025-05-23 DOI: 10.1016/j.dendro.2025.126368

Karel Šilhán

This study investigates the differing responses of two tree species, P. abies and F. sylvatica, to landslide movements and their subsequent effects on landslide chronologies. These are the two most commonly used tree species in dendrogeomorphic landslide research in Central Europe and their combination is generally recommended. However, their specific effect on the resulting chronology is not yet taken into account although they are two quite different species. The research was conducted on 220 individuals of both species located in the Girová landslide area (Outer Western Carpathians), with a focus on the catastrophic event of May 2010. The study sought to understand how these species contribute to dendrogeomorphic reconstructions of landslide events, particularly by analyzing their growth responses and the frequency of growth disturbances (GDs) such as compression and tension wood. The results revealed significant differences in how P. abies and F. sylvatica responded to landslide activity. P. abies showed a higher frequency of GDs (compression wood), but exhibited greater inertia in its physiological response, potentially masking high-frequency landslide events. In contrast, F. sylvatica produced fewer GDs (tension wood), yet its response to landslides was more immediate and efficient, with 100 % intensity in tension wood formation, which helped create a minimum-noise chronology despite fewer identified events. The study highlights the advantages and limitations of both species in dendrogeomorphic research. While P. abies contributes more frequently to detecting landslide events, the inertia in compression wood formation can complicate the interpretation of rapid landslide movements. On the other hand, F. sylvatica, though less responsive in terms of GDs, provides a clearer and more precise landslide chronology. Future research should explore the physiological factors behind these species' different responses to enhance the accuracy of dendrogeomorphic reconstructions.

本研究探讨了两种树种杉木和冷杉对滑坡运动的不同反应及其对滑坡年代学的影响。这是中欧地区树木地貌滑坡研究中最常用的两种树种，一般建议将它们组合使用。然而，尽管它们是两个完全不同的物种，但它们对由此产生的年表的具体影响尚未考虑在内。该研究对位于girov滑坡区（喀尔巴阡山脉外西部）的这两个物种的220只个体进行了研究，重点关注2010年5月的灾难性事件。该研究试图了解这些物种如何有助于滑坡事件的树木地貌重建，特别是通过分析它们的生长响应和生长干扰（GDs）的频率，如压缩和拉伸木材。结果表明，冷杉和森林杉对滑坡活动的响应存在显著差异。冷杉表现出更高的GDs（压缩木）频率，但在生理反应中表现出更大的惯性，可能掩盖了高频滑坡事件。相比之下，F. sylvatica产生较少的GDs（张力木），但它对滑坡的反应更直接和有效，张力木形成的强度为100% %，这有助于创建最小噪音年表，尽管确定的事件较少。该研究突出了这两个物种在树木地貌研究中的优势和局限性。虽然冷杉有助于更频繁地检测滑坡事件，但压缩木材形成的惯性会使快速滑坡运动的解释复杂化。另一方面，F. sylvatica虽然在GDs方面反应较差，但提供了更清晰、更精确的滑坡年表。未来的研究应探索这些物种不同反应背后的生理因素，以提高树木地貌重建的准确性。

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引用次数: 0

Tracheid anatomy of Cryptomeria japonica grown in a humid temperate region: A proxy for short-term climate variability and a crossdating index 生长在湿润温带地区的日本柳杉的管胞解剖：短期气候变率和交叉年代指数的代理

IF 2.7 3区农林科学 Q1 FORESTRY

Dendrochronologia

Pub Date : 2025-05-23 DOI: 10.1016/j.dendro.2025.126363

Takeshi Nakajima , Yusuke Kita , Junji Sugiyama

The tree and site selection principle established for dendrochronology and its subfields has long been used as a standard reference for maximizing the climatic signal recorded in ring widths. However, this principle suffers from its stringent restrictions on available tree species and age, and a minimum number of ring widths. Additionally, a limitation of using ring widths is that it fails to capture the detailed responses to signals from short-term climatic variability preserved in wood chemistry and cellular anatomy. Recently, stable isotope and quantitative wood anatomy have shed light on these perspectives, enabling the extraction of climatic signals even from specimens that were previously considered unsuitable. This study aims to evaluate the potential of quantitative tracheid anatomy in Cryptomeria japonica trees of approximately 70 years of age from a humid-temperate region, Ashiu Forest Research Station, as a proxy for climate signals and a crossdating index, despite being suboptimal under conventional dendrochronological principles. Specifically, lumen radial diameter and cell wall thickness were analyzed for the period between 1965 and 2016. According to a correlation analysis, daily precipitation in July (rainy season) of the current year was highly correlated with the lumen radial diameter (r = 0.71). The lumen radial diameter was also useful for reliably crossdating (Student’s t-value = 7.34) C. japonica specimens from 1965–2016 that could not be crossdated by ring widths. The study findings suggest the possibility that tracheid anatomy of C. japonica may serve as a proxy for climatic variability and a crossdating index in humid-temperate regions.

长期以来，树木年代学及其子领域建立的树木和选址原则一直被用作最大限度地利用年轮宽度记录气候信号的标准参考。然而，这一原则受到其对可用树种和树龄的严格限制以及最小年轮宽度的限制。此外，使用环宽度的一个限制是，它不能捕获木材化学和细胞解剖中保存的短期气候变化信号的详细响应。最近，稳定同位素和定量木材解剖揭示了这些观点，甚至可以从以前认为不合适的标本中提取气候信号。尽管传统的树木年代学原理并不理想，但本研究旨在评估湿温带地区阿丘森林研究站约70年树龄的日本柳杉（Cryptomeria japonica）树木的定量管胞解剖作为气候信号和交叉测年指标的潜力。具体来说，我们分析了1965年至2016年期间的管腔径向直径和细胞壁厚度。相关分析表明，当年7月（雨季）日降水量与管腔径向直径高度相关（r = 0.71）。管腔径向直径对于1965-2016年无法通过环宽度进行交叉年代测定的日本刺青标本也很有用（Student 's t-value = 7.34）。本研究结果提示，在湿温带地区，粳稻的管胞解剖结构可能作为气候变异和交叉测年指标的代表。

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引用次数: 0

Hotter winter-spring droughts accelerated the growth decline of marginal pedunculate oak (Quercus robur) populations in dry sites from Romania 炎热的冬春干旱加速了罗马尼亚干旱地区边缘有花序栎树（栎）种群的生长衰退

IF 2.7 3区农林科学 Q1 FORESTRY

Dendrochronologia

Pub Date : 2025-05-23 DOI: 10.1016/j.dendro.2025.126369

Constantin Nechita , J. Julio Camarero

The pedunculate oak (Quercus robur L.) is a major tree species in Europe, but it has faced recent growth decline and dieback events in some areas resulting in economic and ecosystem losses. In the southeastern edge of its natural distribution in eastern Romania, rising temperatures since the 1980s, when a shift towards warmer and more arid conditions occurred, increased evaporative demand and triggered growth decline. We analyzed the adaptive potential of six oak stands (333 individual trees) with ages ranging between 97 and 233 years, located in three wet and three dry sites. Results showed unstable climate-growth correlations with a breakpoint after 1985 when climate warming intensified. Wet soil conditions from early spring to summer enhanced growth; on the contrary, a high evaporative demand linked to warmer conditions and greater potential evapotranspiration reduced growth, particularly in wet sites. After 1985, drought stress induced a reduction in latewood width in dry sites. The relationship between growth and summer-autumn drought intensified during the last decades in all sites. Warmer spring conditions negatively affected oak growth, particularly latewood production. Wet sites had lower resilience indices, and we also noted a post-1985 progressive reduction of growth resilience. Slow-growing trees from dry sites showed growth decline, which could be an early-warning signal of impending dieback and tree death. In contrast, fast-growing trees from wet sites showed sustained relative growth improvement, which was attributed to tree age and size effects. After 1985, the pedunculate oak is more vulnerable to drought damage in dry sites near the southeastern distribution limit in response to hotter winter-spring droughts.

有梗栎（Quercus robur L.）是欧洲的主要树种，但近年来在一些地区面临着生长衰退和枯死事件，造成了经济和生态系统的损失。在罗马尼亚东部自然分布的东南边缘，自20世纪80年代以来气温不断上升，向更温暖和更干旱的条件转变，增加了蒸发需求，引发了增长下降。我们分析了6个橡树林（333棵树）的适应潜力，这些橡树林的树龄在97到233年之间，分布在3个潮湿和3个干燥的地点。结果表明，1985年以后，气候变暖加剧，气候增长相关性不稳定，存在一个断点。早春至夏季湿润的土壤条件有利于生长；相反，较高的蒸发需求与较温暖的条件和更大的潜在蒸散发有关，从而减少了生长，特别是在潮湿地区。1985年以后，干旱胁迫导致干地晚木宽度减小。近几十年来，生长与夏秋干旱之间的关系在所有地点都有所加强。温暖的春季环境对橡树的生长产生了负面影响，尤其是晚木的生产。湿样地的恢复力指数较低，并且在1985年后逐渐降低。干燥地区生长缓慢的树木表现出生长下降，这可能是即将枯死和树木死亡的早期预警信号。相比之下，湿地生长迅速的树木表现出持续的相对生长改善，这归因于树木的年龄和大小效应。1985年以后，随着冬春干旱的升温，有花序栎在靠近东南分布极限的干地更容易遭受干旱破坏。

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引用次数: 0

Higher growth synchrony and responsiveness to drought in managed-young than in unmanaged-old sessile oak stands during a shift to hotter summers 在夏季变热的过程中，有管理的幼栎比无管理的老栎生长同步性和对干旱的响应性更高

IF 2.7 3区农林科学 Q1 FORESTRY

Dendrochronologia

Pub Date : 2025-05-22 DOI: 10.1016/j.dendro.2025.126371

Any Mary Petritan , Dragos Postolache , Ion Catalin Petritan , Virgil Scarlatescu , J. Julio Camarero

Historical management legacies may condition recent responses of forests to climate warming. In Eastern Europe, unique and well-preserved old-growth sessile oak forests remain. They represent a perfect setting for comparing their radial-growth responses to climate variability, particularly drought stress, with respect to younger managed forests in a region experiencing ongoing aridification. We assessed radial-growth variability and responses to climate variables in three stands dominated by sessile oak (Quercus petraea (Matt.) Liebl.) located in western Romania: a very old unmanaged stand, an old managed stand from seed origin and a young managed stand from sprout origin. There was a shift towards warmer and drier conditions from the 1980s onwards which could have contributed to reduce temporal growth variability, but it did not increase growth coherence among coexisting trees. Very old and old stands showed a higher growth variability among conspecifics comparing with the young stand, which presented a higher growth synchrony. Warm and dry summers and elevated vapor pressure deficit reduced sessile oak growth. The highest responsiveness of growth indices was found for 12-month long droughts ending in summer in the case of young and old managed stands, whereas the very old unmanaged stand showed the lowest responsiveness. Improving tree growth of younger and even old managed stands may make them more responsive to summer soil and atmospheric drought, thus increasing their vulnerability to further water shortage. A better knowledge on how oak growth variability and responsiveness to drought depend on root-to-shoot ratios is needed to manage oak forests and make them more resilient to aridification.

历史管理遗产可能制约森林对气候变暖的近期反应。在东欧，独特而保存完好的古老无柄橡树林仍然存在。对于正在经历持续干旱化的地区的年轻管理森林而言，它们是比较其径向生长对气候变率，特别是干旱压力的反应的理想环境。我们评估了三个以无梗栎（Quercus petaea, Matt.）为主的林分的径向生长变异性及其对气候变量的响应。位于罗马尼亚西部：一个非常古老的无人管理的林分，一个来自种子起源的老管理林分和一个来自发芽起源的年轻管理林分。从20世纪80年代开始，气候条件向更温暖、更干燥的方向转变，这可能有助于降低时间生长变异性，但并没有增加共存树木之间的生长一致性。太古林和老林的生长变异性高于幼林，幼林表现出更高的生长同步性。温暖干燥的夏季和升高的蒸汽压赤字减少了无根橡树的生长。在夏季结束的12个月的干旱中，年轻和年老的管理林分的生长指数响应性最高，而非常老的未管理林分的响应性最低。改善年轻甚至老的管理林分的树木生长可能使它们对夏季土壤和大气干旱更敏感，从而增加它们对进一步缺水的脆弱性。需要更好地了解橡树的生长变异性和对干旱的响应如何取决于根冠比，以管理橡树林并使其更能适应干旱化。

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引用次数: 0

Climate change alters the radial growth responses of P. schrenkiana and J. jarkendensis to climate extremes in the Eastern Pamirs 气候变化改变了东帕米尔高原雪兰和贾尔肯冬的径向生长对极端气候的响应

IF 2.7 3区农林科学 Q1 FORESTRY

Dendrochronologia

Pub Date : 2025-05-18 DOI: 10.1016/j.dendro.2025.126362

Tiane Yang , Yonghui Wang , Tongwen Zhang , Dong Pan , Kexiang Liu , Huaming Shang , Abula Arman , Li Qin , Ruibo Zhang

As global temperatures rise, extreme climate events are becoming more intense, frequent, and prolonged, profoundly altering forest ecosystems, particularly in arid and semi-arid regions. This study employs dendrochronological methods to examine the relationship between the radial growth of Picea schrenkiana (P. schrenkiana) and Juniperus jarkendensis (J. jarkendensis) and extreme climate events in the Eastern Pamirs. The findings reveal that: P. schrenkiana is more sensitive to extreme temperatures fluctuations, whereas J. jarkendensis exhibits a stronger response to extreme precipitation. In the context of global warming, P. schrenkiana and J. jarkendensis exhibit a gradual trend of shifting from negative to positive responses to mean temperature (T) and extreme minimum temperature (TNn). Following climatic abruptions, both species display significant positive correlations with T and TNn, reflecting their adaptive adjustments to a warming climate and indicating their ability to leverage more favorable temperature conditions to promote growth. These results suggest that global warming has significantly altered the growth dynamics of these tree species. The interaction of multiple climate factors, rather than a single variable, drives tree growth. Consequently, targeted management and conservation strategies are essential to mitigate the impacts of extreme climate events on different tree species.

随着全球气温上升，极端气候事件变得更加强烈、频繁和持久，深刻地改变了森林生态系统，特别是在干旱和半干旱地区。本文采用树木年代学方法研究了东帕米尔高原云杉（Picea schrenkiana）和刺柏（Juniperus jarkendensis J. jarkendensis）径向生长与极端气候事件的关系。结果表明：P. schrenkiana对极端温度波动更敏感，而J. jarkendensis对极端降水的响应更强。在全球变暖背景下，P. schrenkiana和J. jarkendensis对平均温度(T)和极端最低温度（TNn）的响应呈现由负向正的渐变趋势。在气候突变后，这两个物种都与T和TNn表现出显著的正相关，反映了它们对气候变暖的适应性调整，表明它们有能力利用更有利的温度条件来促进生长。这些结果表明，全球变暖显著改变了这些树种的生长动态。驱动树木生长的是多种气候因素的相互作用，而不是单一的变量。因此，有针对性的管理和保护策略对于减轻极端气候事件对不同树种的影响至关重要。

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引用次数: 0

Measuring more – The key to a robust signal in ring-porous earlywood vessel chronologies 测量更多——环孔早期血管年表鲁棒信号的关键

IF 2.7 3区农林科学 Q1 FORESTRY

Dendrochronologia

Pub Date : 2025-05-18 DOI: 10.1016/j.dendro.2025.126361

Lisa M.Y. Jourdain , Georg von Arx , Alma Piermattei , Alan Crivellaro , Richard L. Peters , Stefan Klesse

Quantitative wood anatomy is a crucial field increasingly used in dendrochronology due to its high intra-ring resolution and close link to ecophysiological processes. However, earlywood vessel chronologies in ring-porous species often show low statistical quality, such as weak common signal strength and low expressed population signal (EPS). This raises questions about whether these limitations are inherent to the wood type or if methodological refinements could improve chronology robustness. This study evaluates how the amount of measured wood per ring (tangential width) and tree replication impacts the statistical quality and reliability of climate-growth relationships. Therefore, we conducted a systematic analysis using a highly replicated dataset (21 trees per site, 45 mm tangential width per tree) from Fraxinus excelsior and Quercus robur as a robust benchmark. We employed advanced image analysis, resampling, and data simulation techniques. Our analyses show that the spread (uncertainty) of obtained climate correlation values increases with lower replication and common signal strength, with replication as the most influential factor, followed by within-tree accuracy linked to the tangential width. We recommend collecting at least two 5-mm cores (8–10 mm TW) per tree and sampling a minimum of 20 trees in environments without a strong limiting factor (low common signal strength). In contrast to common practice, we promote subsampling based on surface quality rather than high correlation with the tree-ring width master chronology and target an EPS ≥ 0.85 for earlywood vessel chronologies. Finally, careful screening within the array of earlywood vessel variables (first row, mean size, different quantiles, etc.) enables to maximize the signal strength. We believe that our approach, results, and recommendations can contribute to improving the robustness of quantitative wood anatomy chronologies in ring-porous species, but likely also in other wood types.

定量木材解剖由于其高环内分辨率和与生态生理过程密切相关，在树木年代学中应用越来越广泛。然而，环孔物种的早期血管年表往往表现出较低的统计质量，如共同信号强度弱和低表达群体信号（EPS）。这就提出了一个问题，即这些限制是木材类型固有的，还是方法的改进可以提高年表稳健性。本研究评估了每年轮测量木材的数量（切向宽度）和树木复制如何影响气候-生长关系的统计质量和可靠性。因此，我们使用高度复制的数据集（每个站点21棵树，每棵树45 mm切向宽度）进行了系统分析，并将其作为鲁棒基准。我们采用了先进的图像分析、重采样和数据模拟技术。我们的分析表明，获得的气候相关值的传播（不确定性）随着复制和共同信号强度的降低而增加，复制是影响最大的因素，其次是与切线宽度相关的树内精度。我们建议在没有强限制因素（低公共信号强度）的环境中，每棵树至少采集两个5mm核（8-10 mm TW），采样至少20棵树。与通常的做法相反，我们提倡基于表面质量而不是与树轮宽度主年表高度相关的子采样，并将EPS≥ 0.85作为早期坞血管年表的目标。最后，仔细筛选早期血管变量数组（第一行，平均大小，不同分位数等）可以最大限度地提高信号强度。我们相信，我们的方法、结果和建议可以有助于提高环孔树种定量木材解剖年表的稳健性，但也可能适用于其他木材类型。

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引用次数: 0

Variation in radial growth sensitivity to drought among genetic groups of common yew (Taxus baccata L.) in central Italy 意大利中部普通红豆杉（Taxus baccata L.）遗传群间径向生长对干旱敏感性的差异

IF 2.7 3区农林科学 Q1 FORESTRY

Dendrochronologia

Pub Date : 2025-05-17 DOI: 10.1016/j.dendro.2025.126360

Enrico Tonelli , Camilla Avanzi , Elena Bitocchi , Alessandro Vitali , Andrea Piotti , Ilaria Spanu , Elena Barocci , Carlo Urbinati

Common yew (Taxus baccata L.) is a long-living European species, with significant ecological importance. Climate change and severe droughts threaten its growth, emphasizing the need for preserving genetic diversity. By combining dendroecology and genetics, we aimed to identify groups of trees most resilient to changing climatic conditions. We analysed radial growth trends from 1951 to 2018 in three populations located in two mountain areas of central Italy with different rainfall regimes. From 298 selected yew trees, needles were collected for DNA extraction, and tree-ring cores were obtained for dendrochronological analysis. We assessed the relationship between tree growth and drought using the Standardized Precipitation Evapotranspiration Index (SPEI). The studied populations clustered in two distinct genetic groups, corresponding to the driest and wettest areas. At the rainiest site, in the period 1951–2018 yew growth was less constrained by evapotranspiration rates than at the driest area, but climate-growth analysis on moving windows indicates an increasing impact of drought. Growth recovery time after the 2003 drought was longer in individuals at the rainiest area compared to the more xeric sites. The yew trees of the driest area, which were further subdivided in two genetically distinct but spatially intermingled sub-groups, appeared to be better adapted to drought events and therefore more suitable for future warmer scenarios. This study highlights the climate sensitivity of common yew, showing that summer droughts can limit growth, and suggests the advantages of using a dendrogenetic approach to delve deeper into ecophysiological responses to be exploited for reforestation and conservation efforts.

红豆杉（Taxus baccata L.）是一种长寿的欧洲物种，具有重要的生态意义。气候变化和严重干旱威胁着它的生长，强调了保护遗传多样性的必要性。通过结合树木生态学和遗传学，我们的目标是确定最能适应气候变化的树木群体。我们分析了1951年至2018年意大利中部两个不同降雨量山区三个人口的径向增长趋势。从298棵紫杉树中采集针叶进行DNA提取，获得年轮核进行树木年代学分析。我们利用标准化降水蒸散指数（SPEI）评估了树木生长与干旱的关系。研究的种群聚集在两个不同的遗传群体中，对应于最干燥和最潮湿的地区。在1951-2018年多雨地区，与最干旱地区相比，红豆杉生长受蒸散速率的限制较小，但对移动窗口的气候生长分析表明，干旱的影响越来越大。2003年干旱后，多雨地区的个体生长恢复时间比干旱地区的个体长。最干旱地区的红豆杉被进一步细分为两个遗传上不同但空间上混杂的亚群，它们似乎能更好地适应干旱事件，因此更适合未来更温暖的情景。这项研究强调了普通红豆杉的气候敏感性，表明夏季干旱会限制其生长，并提出了使用树木遗传学方法深入研究生态生理反应的优势，可用于重新造林和保护工作。

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引用次数: 0

Differential responses of pinaceae and cupressaceae tree radial growth to drought in Central Asia 中亚松科和柏科树木径向生长对干旱的差异响应

IF 2.7 3区农林科学 Q1 FORESTRY

Dendrochronologia

Pub Date : 2025-05-16 DOI: 10.1016/j.dendro.2025.126350

Peng Zhang , Liang Jiao , Ruhong Xue , Xuge Wang , Qian Li , Zhengdong Guo , Le Zhang , Yarong Qin

Global climate change is increasing the intensity and frequency of compound hot-drought events, with many negative impacts on forest ecosystems. The dynamics of tree growth recovery after compound hot-drought events and the factors influencing it are unclear. Therefore, we collected data on a total of 101 tree ring widths of eight tree species in Central Asia, which were categorized into two main groups, Pinaceae and Cupressaceae. We first quantified tree growth loss during drought and growth recovery after drought, and then linear mixed models assessed factors affecting tree growth recovery. The results showed that after a compound hot-drought event, Pinaceae radial growth declined more and took longer to recover, while Cupressaceae radial growth declined less and recovered quickly. There was a significant downward trend in growth loss during drought as tree pre-drought growth levels increased. Tree growth recovery tended to increase as both pre-drought growth levels and post-drought wetness increased, and higher pre-drought growth levels were required for Pinaceae to return to normal growth levels after a compound hot-drought event. Linear mixed modeling results showed greater contribution of pre-drought growth levels and growth loss to growth recovery. Thus, Cupressaceae was able to better adapt to compound heat-drought events, while higher pre-drought growth levels and post-drought wetness were key to increased growth recovery.

全球气候变化增加了复合热旱事件的强度和频率，对森林生态系统产生了许多负面影响。复合干热事件后树木生长恢复的动态及其影响因素尚不清楚。因此，我们收集了中亚8种树种的101个树木年轮宽度数据，将其分为松科和柏科两大类。我们首先量化了干旱期间树木的生长损失和干旱后树木的生长恢复，然后用线性混合模型评估了影响树木生长恢复的因素。结果表明：复合热旱事件后，松科植物径向生长下降幅度较大，恢复时间较长；柏科植物径向生长下降幅度较小，恢复速度较快；干旱期间树木生长损失呈显著下降趋势，干旱前树木生长水平增加。随着干旱前生长水平和干旱后湿度的增加，树木的生长恢复都有增加的趋势，并且在复合热干旱事件后，松科植物需要更高的干旱前生长水平才能恢复正常生长水平。线性混合模拟结果显示，干旱前的生长水平和生长损失对生长恢复的贡献更大。因此，柏科植物能够更好地适应复合热干旱事件，而较高的干旱前生长水平和干旱后的湿度是促进生长恢复的关键。

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引用次数: 0

Climate sensitivity of Quercus macranthera Fisch. & C. A. Mey. at the high-elevation forest edge of the Alborz Mountains, N Iran 黑栎的气候敏感性研究。& C. A.好的。位于伊朗北部阿尔博尔斯山脉的高海拔森林边缘

IF 2.7 3区农林科学 Q1 FORESTRY

Dendrochronologia

Pub Date : 2025-05-15 DOI: 10.1016/j.dendro.2025.126358

Halime Moradi, Niels Schwab, Udo Schickhoff

Alpine treelines mark the upper limits of tree growth in mountain ecosystems, with heat deficiency being the globally common abiotic driver. Controlled by low temperatures, tree growth at treelines will be responsive to above-average climate warming in the world’s high mountains. Trees at the high-elevation forest edge of the Alborz Mountains in northern Iran have rarely been used so far to study growth-climate relationships. While growth responses to climate change have been studied for several species in this region, the effects of climatic factors on Quercus macranthera Fisch. & C. A. Mey., particularly at the current upper tree limit, remain underexplored. This study investigates the dendroclimatology of Quercus macranthera, the dominant species at the high-elevation forest edge in the Alborz Mountains. We developed tree ring width (TRW) chronologies spanning over 400 years from three sites to investigate long-term relationships between tree growth and climate. The chronologies showed significant correlations with temperature and precipitation patterns. Radial growth was positively influenced by winter and spring temperatures and growing season precipitation. Drought stress, particularly in late summer and autumn, emerged as a key growth limiting factor. These results suggest that Quercus macranthera is sensitive to climate variability, with local factors such as topography and moisture availability modifying the sensitivity. This study highlights the potential impacts of climate change on high-elevation forests and sheds light on how Quercus macranthera may respond to future climate change.

高山树线标志着山地生态系统树木生长的上限，而热缺乏是全球共同的非生物驱动因素。在低温的控制下，林木线上的树木生长将对世界高山地区高于平均水平的气候变暖做出反应。迄今为止，伊朗北部阿尔博尔斯山脉高海拔森林边缘的树木很少被用来研究生长与气候的关系。在研究了气候变化对该地区几种栎属植物生长的影响的基础上，探讨了气候因子对栎属植物生长的影响。,答：好的。特别是在目前的树木上限，仍未得到充分开发。本文研究了阿尔伯斯山高海拔森林边缘优势树种大栎的树木气候学特征。我们建立了跨度超过400年的树木年轮宽度年表，以研究树木生长与气候之间的长期关系。年代学与温度和降水模式呈显著相关。冬春季气温和生长季降水对径向生长有正向影响。干旱胁迫，特别是夏末和秋季的干旱胁迫，成为了主要的生长限制因素。这些结果表明，大栎对气候变率敏感，地形和水分有效性等局部因素改变了敏感性。这项研究强调了气候变化对高海拔森林的潜在影响，并揭示了大栎树如何应对未来的气候变化。

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引用次数: 0

The first temperature reconstruction based on tree-ring blue intensity in the Qinling Mountains 秦岭首次基于树轮蓝强度的温度重建

IF 2.7 3区农林科学 Q1 FORESTRY

Dendrochronologia

Pub Date : 2025-05-15 DOI: 10.1016/j.dendro.2025.126359

Mei Xie , Qiufang Cai , Yu Liu , Keyan Fang , Qiuyue Zhou , Meng Ren , Kebayier Meng , Qiang Li , Changfeng Sun , Huiming Song , Dan Chen , Yufei Chen

Reconstructing historical temperatures is crucial for understanding climate history and predicting future changes. While traditional proxies such as tree-ring width, stable isotopes, and X-ray density, may be limited by poor temperature signal capture or high costs, the emerging blue intensity (BI) in tree rings provides an effective alternative for low-latitude temperature reconstruction. Here for the first time, we introduce BI to examine the climatic signals in Pinus tabulaeformis Carr. from the Qinling Mountains (QLM). We develop chronologies for tree-ring width (TRW), earlywood BI (EWBI), latewood BI (LWBI), and Delta BI (DeltaBI) based on P. tabulaeformis samples, and then successfully reconstruct the mean February–June maximum temperature (Tmax_2–6) anomalies over the past 174 years using the EWBI chronology, with an explained variance of 43.56 % for the observed data. Our key findings include: 1) Tree-ring BI data in the QLM retains stronger climatic information than the TRW data. 2) Our reconstruction reveals that QLM experienced three significant warm periods (1871–1892, 1898–1931, and 2012–2020) and three cold periods (1856–1864, 1939–1965, and 1976–1996). The new reconstruction aligns with nearby temperature reconstructions and climate grid data, documenting similar temperature fluctuations in the western Loess Plateau and the QLM. 3) It suggests a significant link between Tmax_2–6 variations in the QLM and large-scale climate oscillations, specifically the Pacific Decadal Oscillation (PDO) and the Atlantic Multidecadal Oscillation (AMO). This study affirms the utility of tree-ring BI for climate research in the QLM, offering insights that benefit similar low-latitude areas.

重建历史温度对于理解气候历史和预测未来变化至关重要。传统的替代方法，如树木年轮宽度、稳定同位素和x射线密度，可能会受到温度信号捕获差或成本高的限制，而树木年轮中出现的蓝色强度（BI）为低纬度温度重建提供了有效的替代方法。本文首次引入BI来研究油松的气候信号。来自秦岭（QLM）。基于油松样本建立了树轮宽度（TRW）、早木BI （EWBI）、晚木BI （LWBI）和三角洲BI （DeltaBI）年表，利用EWBI年表成功重建了过去174年2 - 6月平均最高气温（Tmax2-6）异常，解释方差为43.56 %。主要发现包括：1)QLM中树木年轮BI数据比TRW数据保留了更强的气候信息。2)重建结果表明，青海经历了3个显著暖期（1871 ~ 1892年、1898 ~ 1931年和2012 ~ 2020年）和3个显著冷期（1856 ~ 1864年、1939 ~ 1965年和1976 ~ 1996年）。新的重建与附近的温度重建和气候网格数据一致，记录了黄土高原西部和QLM相似的温度波动。3) qm Tmax2-6的变化与大尺度气候振荡，特别是太平洋年代际涛动（PDO）和大西洋多年代际涛动（AMO）之间存在显著联系。这项研究肯定了树木年轮BI在QLM气候研究中的效用，为类似的低纬度地区提供了有益的见解。

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引用次数: 0