Dendrochronologia最新文献_第9页

Comparative analysis of wood anatomy of European larch, Norway spruce, and European beech in mixed and monoculture stands under contrasting climatic conditions 不同气候条件下混交林和单一林分欧洲落叶松、挪威云杉和欧洲山毛榉木材解剖结构的比较分析

IF 2.7 3区农林科学 Q1 FORESTRY

Dendrochronologia

Pub Date : 2025-05-28 DOI: 10.1016/j.dendro.2025.126364

Viktória Pipíšková , Angela Balzano , Soham Basu , Maks Merela , Pavel Bednář , Jan Světlík

We present a tree-ring and wood-anatomical study of less widespread European larch (L. decidua) growing in mixed a monoculture stands with the economically important Norway spruce (P. abies) and European beech (F. sylvatica) under identical meteorological conditions in the Czech highlands. Tree responses to drought were assessed by comparing two contrasting periods: Control period (2009–2010) and a Dry period (2017–2018). We analysed tree-ring widths (TRW), early- and latewood widths (EWW/LWW), lumen area (LA), cell wall thickness (CWT), cell density (CD), relative conducting area (RCTA), hydraulically weighted mean cell diameter (D_h), and the potential hydraulic conductivity (K_p). A significant reduction in radial growth (51.8 %) was observed during the Dry period, with spruce and beech showing the greatest decline in monocultures, while larch exhibited mostly non-significant changes. Although TRW did not differ significantly between mixtures and monocultures within species, notable variations emerged at the wood-anatomical level. Tree species generally showed reduced anatomical variability and more stable water conductivity mostly in mixed stands under dry conditions. However, drought impacts were more pronounced in larger trees and denser stands, suggesting that forest structure can amplify vulnerability to water stress. Species-specific drought responses were distinct: larch showed no anatomical changes; spruce exhibited the greatest reduction in latewood lumen area and cell wall thickness; and beech reduced lumen area while increasing cell density, enhancing water transport efficiency under prolonged drought.

我们提出了一个树木年轮和木材解剖研究较少分布的欧洲落叶松（L. decidua）生长在混合单一的森林与经济上重要的挪威云杉（P. abies）和欧洲山毛榉（F. sylvatica）在相同的气象条件下在捷克高地。通过比较两个对照期：对照期（2009-2010年）和干旱期（2017-2018年）来评估树木对干旱的响应。我们分析了树木年轮宽度（TRW）、早期和晚期木材宽度（EWW/LWW）、管腔面积（LA）、细胞壁厚度（CWT）、细胞密度（CD）、相对传导面积（RCTA）、水力加权平均细胞直径（Dh）和潜在的水力传导率（Kp）。在干旱期，径向生长显著降低（51.8 %），其中云杉和山毛榉在单一栽培中下降最大，而落叶松的变化不显著。虽然混合栽培和单一栽培在种内的TRW差异不显著，但在木材解剖水平上存在显著差异。在干燥条件下，混合林分树种的解剖变异性普遍降低，水分传导性更稳定。然而，干旱的影响在较大的树木和密度较大的林分中更为明显，这表明森林结构可以放大对水分胁迫的脆弱性。物种特异性的干旱响应是明显的：落叶松没有解剖变化；云杉晚木的管腔面积和细胞壁厚度减少幅度最大；山毛榉减少了管腔面积，增加了细胞密度，提高了长期干旱条件下的水分输送效率。

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引用次数: 0

Consistent summer temperature signals in a latewood blue intensity network from the upper tree line in the Caucasus 高加索地区林木线上方的晚木蓝强度网络中一致的夏季温度信号

IF 2.7 3区农林科学 Q1 FORESTRY

Dendrochronologia

Pub Date : 2025-05-24 DOI: 10.1016/j.dendro.2025.126372

Rupesh Dhyani , Dario Martin-Benito , Mehmet Doğan , Revaz Kvaratskhelia , Nesibe Köse , Hüseyin Tuncay Güner , Lea Schneider

Climate variability in the Caucasus region significantly influences tree growth in alpine tree line ecotones. However, long-standing human land-use history disrupted the natural equilibrium between montane forests and alpine meadows. These complex vegetation dynamics may cause traditional proxies such as tree-ring width (TRW) to display a weak climate signal, limiting their utility for understanding growth-climate relationships. To address these challenges, we established a multispecies network of seven tree ring width index (TRWI) and seven latewood blue intensity (LWBI) chronologies from three coniferous species (Picea orientalis, Abies nordmanniana and Pinus sylvestris) at current tree line sites (1900–2300 masl) in the Greater and Lesser Caucasus. Our results show that almost all the LWBI site chronologies demonstrate consistent and stable correlation with summer temperature (June-August). In contrast, corresponding TRWI chronologies reveal much weaker correlations with temperature, mainly with previous winter and spring. TRWI moderately responds to precipitation during the summer (JJA) while LWBI does not show any significant response to precipitation. The weaker and less consistent temperature signals in TRWI chronologies suggest additional influence of precipitation, non-climatic factors and local disturbance events on TRWI. Principal component analysis reveals a robust common signal in the LWBI network. First principal components from both proxies correlate with summer temperatures, although correlation is much higher for LWBI than for TRWI. The stable and consistent relationship between LWBI and summer temperature in different frequency domains indicates high potential of this proxy for annually resolved climate reconstructions at a regional level, which would be new for the Lesser Caucasus region.

高加索地区气候变率对高山林木线过渡带树木生长有显著影响。然而，长期的人类土地利用历史破坏了山地森林和高山草甸之间的自然平衡。这些复杂的植被动态可能导致树木年轮宽度（TRW）等传统指标显示出微弱的气候信号，从而限制了它们在理解生长-气候关系方面的效用。为了应对这些挑战，我们在大高加索和小高加索地区现有的林木线站点（1900-2300 masl）建立了一个多物种网络，包括7个树木年轮宽度指数（TRWI）和7个晚木蓝强度（LWBI）年代学，这些年代学来自3种针叶林物种（云杉、北冷杉和西尔韦斯松）。结果表明，几乎所有LWBI站点年表都与夏季气温（6 - 8月）具有一致且稳定的相关性。相比之下，相应的TRWI年表显示与温度的相关性要弱得多，主要与之前的冬季和春季有关。TRWI对夏季降水有中等响应，而LWBI对降水没有显著响应。TRWI年表中较弱且不一致的温度信号表明降水、非气候因素和局地扰动事件对TRWI有额外的影响。主成分分析揭示了LWBI网络中存在鲁棒的公共信号。第一，两个代理的主成分与夏季气温相关，尽管LWBI的相关性比TRWI高得多。LWBI与夏季温度在不同频率域的稳定一致关系表明，该方法在区域水平上具有很高的潜力，这对于小高加索地区来说是新的。

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引用次数: 0

Stable carbon and oxygen isotope ratios in Norway spruce (Picea abies (L.) Karst.) tree rings along an elevation gradient in the Rarau Mts. (Romania) 挪威云杉（Picea abies (L.)）的稳定碳氧同位素比值（罗马尼亚）拉劳山脉沿海拔梯度的喀斯特树木年轮

IF 2.7 3区农林科学 Q1 FORESTRY

Dendrochronologia

Pub Date : 2025-05-24 DOI: 10.1016/j.dendro.2025.126365

Daniela Maria Llanos-Campana , Zoltan Kern , Ionel Popa , Aurel Perşoiu

This study investigates the variations of δ¹³C and δ¹⁸O isotopes in alpha-cellulose extracted from Norway spruce (Picea abies (L.) Karst.) across an altitudinal gradient in the Eastern Carpathians. Results reveal mean δ¹⁸O values decrease with elevation aligning with the altitude effect and indicating influences from source water composition, precipitation dynamics, and evaporative enrichment. In contrast, mean δ¹³C values do not exhibit consistent altitudinal trends, highlighting the impact of local environmental factors like water stress and light exposure. In addition, the isotopic composition was correlated with environmental variables such as temperature (maximum and minimum) and precipitation to explore physiological responses of Norway spruce to climate conditions. The correlation between δ¹⁸O values and summer precipitation is weakening, while growing season temperature signal is strengthening towards higher elevations suggesting that the role of available water is diminishing, and ambient temperature is enhancing as approaching the timberline. A weakening trend was found for the negative correlation between δ¹³C values and summer precipitation. The correlation between δ¹³C values and precipitation (negative) and temperature (positive) in the growing period for the low elevation stand points to strong drought stress explained by changes in stomatal conductance during dry and warm conditions. The faint negative correlation with temperature for higher stands can be an indirect response to other direct controlling factors, such as relative humidity which is inversely related to temperature.

研究了挪威云杉(Picea abies (L.)) α -纤维素中δ13C和δ18O同位素的变化。喀尔巴阡山脉东部的喀尔巴阡山脉横跨海拔梯度。结果表明，平均δ18O值随海拔升高而减小，与海拔效应一致，表明受水源组成、降水动力学和蒸发富集的影响。相比之下，平均δ13C值在海拔上的变化趋势不一致，突出了水分胁迫和光照等局地环境因素的影响。此外，同位素组成与温度（最高和最低）和降水等环境变量相关，以探索挪威云杉对气候条件的生理响应。δ18O值与夏季降水的相关性逐渐减弱，生长期温度信号向高海拔方向增强，表明有效水分的作用逐渐减弱，而环境温度随着靠近树带线而增强。δ13C值与夏季降水的负相关呈减弱趋势。低海拔林分生长期δ13C值与降水（负）和温度（正）的相关关系表明，干旱和温暖条件下气孔导度的变化说明了强干旱胁迫。较高林分与温度的微弱负相关可能是对其他直接控制因素的间接响应，例如相对湿度与温度呈负相关。

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引用次数: 0

Atmospheric mercury pollution recorded in conifer tree rings: Disentangling the effects of tree-ring width, water content, and climate on mercury concentrations 记录在针叶树年轮中的大气汞污染：解开树木年轮宽度、含水量和气候对汞浓度的影响

IF 2.7 3区农林科学 Q1 FORESTRY

Dendrochronologia

Pub Date : 2025-05-24 DOI: 10.1016/j.dendro.2025.126370

Katrien Boonen , Rohan Shetti , Tomáš Navrátil , Tereza Nováková , Jan Rohovec , Jiří Lehejček

Mercury (Hg) is a contaminant of major concern for public and ecosystem health, known for its toxicity and bioaccumulation in the environment. Reconstructing past Hg pollution, as well as monitoring current Hg concentrations, is therefore essential. Tree rings offer a valuable archive for reconstructing historical atmospheric Hg pollution, yet the reliability of dendrochemical Hg reconstructions depends on understanding all factors that influence Hg accumulation in the xylem. This study investigated whether factors beyond atmospheric Hg concentrations, i.e., climatic variables (temperature and precipitation), tree-ring width, and water content, influenced Hg concentrations in the tree rings of European larch and Douglas fir growing near a chlor-alkali plant in the Czech city of Ústí nad Labem. Both tree species showed similar long-term trends in Hg concentrations, broadly reflecting historical trends in atmospheric Hg pollution. However, short-term (high-frequency) variability in tree-ring Hg concentrations remaining after detrending was associated with other factors. A positive correlation between water content and Hg concentrations suggested that a fraction of the Hg was retained in xylem sap. In European larch heartwood, Hg concentrations correlated positively with tree-ring width, likely due to heartwood formation processes. In Douglas fir, a positive correlation between August-September precipitation and tree-ring Hg suggested that this tree species’ isohydric behaviour affected Hg uptake. These findings indicated that while tree-ring Hg concentrations can serve as proxies for historical atmospheric Hg pollution, other factors, such as tree-ring width, water content, and late-summer precipitation, may modulate the signal and should be considered in dendrochemical Hg reconstructions.

汞（Hg）是一种对公众和生态系统健康具有重大影响的污染物，因其毒性和在环境中的生物积累而闻名。因此，重建过去的汞污染以及监测当前的汞浓度是必不可少的。树木年轮为重建历史大气汞污染提供了宝贵的资料，但树木化学汞重建的可靠性取决于对影响木质部汞积累的所有因素的了解。本研究调查了大气中汞浓度以外的因素，即气候变量（温度和降水）、树木年轮宽度和含水量，是否影响生长在捷克Ústí nad Labem市氯碱工厂附近的欧洲落叶松和道格拉斯冷杉的年轮中的汞浓度。两种树种的汞浓度表现出相似的长期趋势，大致反映了大气汞污染的历史趋势。然而，树木年轮汞浓度消除趋势后的短期（高频）变异性与其他因素有关。水分含量与汞浓度呈正相关，表明木质部汁液中保留了一部分汞。在欧洲落叶松心材中，汞浓度与树轮宽度呈正相关，这可能是由于心材形成过程所致。在花旗松中，8 - 9月降水与树轮汞呈正相关，表明该树种的等水行为影响了汞的吸收。这些发现表明，虽然树木年轮汞浓度可以作为历史大气汞污染的代表，但其他因素，如树木年轮宽度、含水量和夏末降水，可能会调节信号，在树木化学汞重建中应该考虑这些因素。

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引用次数: 0

Benchmarking Blue Intensity from drought limited Pinus sylvestris using tree-ring anatomy 利用树木年轮解剖对干旱受限的西林松蓝强度进行基准测试

IF 2.7 3区农林科学 Q1 FORESTRY

Dendrochronologia

Pub Date : 2025-05-23 DOI: 10.1016/j.dendro.2025.126367

Kristina Seftigen , Georg von Arx , Marina V. Fonti , Jesper Björklund

Robust, high-resolution proxy information on hydroclimate is critical for understanding the recent European drying in the context of natural variability. This is particularly true for Fennoscandia and the surrounding northern high latitude regions, where such records are scarce, and little is known about the physical drivers of these rare events. Recently, the potential of tree-ring Blue Intensity (BI) of Pinus sylvestris L. from cool drought-prone sites has emerged as a source of high-resolution hydroclimate information. Limitations to these proxies may however be linked to the analytical measurement resolution of the technique as well as potential color-related biases caused by the heartwood-sapwood transition and decay-associated discoloration of the tree-ring samples. These proxy uncertainties need to be addressed before the methodology can be used more systematically in the context of hydroclimate reconstructions. Here, we evaluate the reliability of BI tree-ring parameters, specifically regarding their ability to accurately track both low-frequency variations as well as hydroclimate extremes. This is accomplished by benchmarking these parameters against newly developed quantitative wood anatomical (QWA) data from Pinus sylvestris trees in southeast of Sweden. The ΔBI parameter shows a high similarity to its QWA analogue across scales ranging from interannual to centennial, suggesting that the Δ conversion efficiently overcomes the long-term trend biases seen in the raw BI data. The earlywood and latewood BI parameters record largely the same strong spring-summer precipitation signal, together explaining over 50 % of the variance in May-July precipitation, as do their QWA counterparts. However, both BI and QWA show a pronounced asymmetric response to precipitation extremes such that dry extremes are captured better than the wet extremes. This dry-biased extreme value capture needs careful consideration in future reconstruction efforts. We conclude that tree-ring BI holds significant potential for contributing to regional reconstructions, especially given the untapped opportunities to utilize the region’s extensive collection of historical pine material for paleoclimate research.

关于水文气候的可靠、高分辨率的代理信息对于理解在自然变率背景下最近欧洲的干燥至关重要。对于芬诺斯坎迪亚和周边的北部高纬度地区来说尤其如此，在那里这样的记录很少，而且人们对这些罕见事件的物理驱动因素知之甚少。近年来，来自寒冷干旱易发地区的西尔维斯松（Pinus sylvestris L.）树木年轮蓝色强度（BI）的潜力已成为高分辨率水文气候信息的来源。然而，这些代理的局限性可能与该技术的分析测量分辨率以及由心材-边材过渡和树木年轮样品的腐烂相关变色引起的潜在颜色相关偏差有关。在该方法能够更系统地用于水文气候重建之前，需要解决这些代理不确定性。在这里，我们评估了BI树轮参数的可靠性，特别是关于它们准确跟踪低频变化和极端水文气候的能力。这是通过将这些参数与瑞典东南部松树新开发的定量木材解剖（QWA）数据进行基准测试来完成的。ΔBI参数在从年际到百年的尺度上与QWA相似，表明Δ转换有效地克服了原始BI数据中出现的长期趋势偏差。早木和晚木BI参数记录了大致相同的强春夏降水信号，共同解释了5 - 7月降水变化的50% %以上，QWA的对应参数也是如此。然而，BI和QWA对降水极端值都表现出明显的不对称响应，因此干燥极端值比潮湿极端值更容易被捕获。在未来的重建工作中，需要仔细考虑这种干偏极值捕获。我们的结论是，树木年轮BI对区域重建具有重要的贡献潜力，特别是考虑到利用该地区广泛收集的历史松树材料进行古气候研究的未开发机会。

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引用次数: 0

Varying climate signals embedded in latewood blue intensity along an elevational gradient: A multi-species case study from the Great Basin, Nevada, USA 不同的气候信号嵌入在沿海拔梯度的红木蓝强度：来自美国内华达州大盆地的多物种案例研究

IF 2.7 3区农林科学 Q1 FORESTRY

Dendrochronologia

Pub Date : 2025-05-23 DOI: 10.1016/j.dendro.2025.126366

Karen E. King , Edward R. Cook , Paul J. Krusic , Daniel J. King

As blue intensity (BI) methods are increasingly employed to generate temperature-sensitive tree-ring records around the globe, the influence of intra-site variation in elevation on climate-growth relationships for BI parameters remains largely unresolved. Here, we develop six latewood blue intensity (LWBI) chronologies along an elevational gradient for two montane conifer species, Abies concolor var. concolor (Gordon & Glend.) Lindl. Ex Hilderb and Picea engelmannii Parry ex Engelm., growing in the arid southwestern United States. In this first documented study to examine the climate response of LWBI from A. concolor, we find positive, significant (p < 0.05) correlations between the LWBI chronology from the highest elevation plot and spring–summer temperatures (April–August, r > 0.46). Moreover, the positive temperature response of A. concolor is generally stronger and more temporally stable than for P. engelmannii across varying seasonal windows. In comparing the differences in climate response across species and elevation, we document distinct clinal relationships between the temperature response of LWBI for A. concolor, where both the strength and temporal stability of the positive temperature signal increases with elevation. Meanwhile, the mid-elevation P. engelmannii demonstrate the highest climate sensitivity. As such, our findings contribute to a more comprehensive understanding of how elevation influences the type and strength of the climatic information embedded within the LWBI parameter from arid, montane conifers growing near their historical range margins.

随着蓝强度（BI）方法在全球范围内被越来越多地用于生成温度敏感的树木年轮记录，在BI参数中，站点内海拔变化对气候-生长关系的影响在很大程度上仍未得到解决。在这里，我们沿着海拔梯度对两种山地针叶树种Abies concolor var. concolor (Gordon &；Glend)。采用。Ex Hilderb和Picea engelmannii Ex Engelm。生长在干旱的美国西南部。在这一研究中，我们发现最高海拔样地的LWBI年代学与春夏气温（4 - 8月，r >； 0.46）之间存在显著正相关（p <； 0.05）。此外，在不同的季节窗内，彩蚜的正温度响应通常比恩格尔曼氏假单胞菌更强，时间上也更稳定。在比较不同物种和海拔对气候响应的差异时，我们发现白桦LWBI的温度响应之间存在明显的临床关系，其中正温度信号的强度和时间稳定性都随着海拔的升高而增加。同时，中高海拔的恩格尔曼草表现出最高的气候敏感性。因此，我们的发现有助于更全面地了解海拔如何影响LWBI参数中嵌入的气候信息的类型和强度，这些信息来自生长在其历史范围边缘附近的干旱山地针叶树。

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引用次数: 0

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