Dendrochronologia最新文献_第5页

Climate driven divergence of growth resilience of Picea crassifolia from semi-arid to semi-humid habitats 半干旱-半湿润生境下云杉生长恢复力的气候差异

IF 2.3 3区农林科学 Q1 FORESTRY

Dendrochronologia

Pub Date : 2025-10-10 DOI: 10.1016/j.dendro.2025.126428

Zhengdong Guo , Liang Jiao , Ruhong Xue , Yarong Qin , Kuan Zhang , Peng Zhang , Xuge Wang , Xin Yuan , Weiyin Shi

Analyzing the growth differences of Picea crassifolia across distinct habitats and elevational gradients will improve our understanding of tree climate adaptation strategies under climate change. Tree ring cores were collected from high, middle, and low elevation P. crassifolia stands in the Helan Mountains (dry habitat) and Qilian Mountains (humid habitat) of northwest China. We investigated radial growth dynamics, quantified the relative importance of temperature, precipitation, and drought on growth, and assessed ecological resilience patterns to drought stress. The results showed (1) trees in dry habitats exhibited an initial growth increase followed by decline, with drought dominating radial growth (50.90 %). In contrast, trees in humid habitats showed sustained growth acceleration primarily driven by temperature (69.96 %). (2) P. crassifolia in dry habitats adopted a survival-priority strategy characterized by low resistance–high recovery to drought stress, whereas humid habitat trees displayed a growth-priority strategy with high resistance–low recovery. (3) elevation gradients significantly amplified the divergence of P. crassifolia trade-off strategies in dry habitats (p < 0.05), but exerted minimal effects in humid habitats. Our research demonstrates that hydrothermal combinations drive growth divergence of P. crassifolia across habitats by modulating their climate responses and trade-off strategies. Differentiated forest management strategies are urgently needed to address growth decline in dry habitats and recovery risks in humid habitats.

分析不同生境和海拔梯度下云杉的生长差异，有助于我们更好地认识气候变化下树木的气候适应策略。对贺兰山（干燥生境）和祁连山（湿润生境）高、中、低海拔的沙棘林进行了年轮核采集。我们研究了径向生长动态，量化了温度、降水和干旱对生长的相对重要性，并评估了对干旱胁迫的生态恢复模式。结果表明：(1)干燥生境下树木的生长表现为先增后降，径向生长以干旱为主（50.90% %）；相比之下，潮湿生境的树木表现出持续的生长加速，主要是由温度驱动的（69.96 %）。(2)干燥生境的沙棘林对干旱胁迫表现出低抗性-高恢复的生存优先策略，湿润生境的沙棘林则表现出高抗性-低恢复的生长优先策略。(3)海拔梯度显著放大了干旱生境下沙棘林权衡策略的差异（p <； 0.05），但对湿润生境的影响很小。我们的研究表明，热液组合通过调节其气候响应和权衡策略，驱动了沙棘科植物在不同栖息地的生长差异。迫切需要采取差异化的森林管理战略，以解决干旱生境的生长下降和潮湿生境的恢复风险。

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引用次数: 0

Growth of Tamarix ramosissima Ledeb. is benefitting from the recent climate change at the southern Tarim basin, northwest China 柽柳生长发育的研究。中国西北部塔里木盆地南部最近的气候变化带来了什么好处

IF 2.3 3区农林科学 Q1 FORESTRY

Dendrochronologia

Pub Date : 2025-10-08 DOI: 10.1016/j.dendro.2025.126427

Maierdang Keyimu , Yanying Qi , Jianhua Peng , Yesi Zhao , Fanjiang Zeng

Tamarix ramosissima is a widely distributed shrub species in hyper arid areas of northwest China. However, the response of T. ramosissima radial growth to the recent “warm and humid” climate at the southern Tarim basin remains unclear. Here we collected disc samples of T. ramosissima in the desert oasis ecotone at the southern Tarim basin. We used dendrochronology techniques to process the samples and established tree – ring width chronology. Growth-climate relationship analysis revealed that the radial growth of T. ramosissima exhibited positive correlations with: (1) minimum temperature in the previous year autumn, winter, current spring, and early summer; (2) precipitation in late winter, current year spring, and early summer; and (3) drought in late autumn of the previous year, spring, and early summer of the current year. The moving correlation analysis demonstrated that the relationship between radial growth of T. ramosissima and minimum temperature during the constraining seasons gradually strengthened, while the relationship with precipitation, and drought index generally decreased. The above results suggest that the growth of T. ramosissima is benefiting from the current climatic conditions in this region, suggesting that its ecological shelterbelt functions might be improved.

柽柳（Tamarix ramosissima）是中国西北极度干旱区广泛分布的灌木树种。然而，柽柳径向生长对塔里木盆地南部近期“暖湿”气候的响应尚不清楚。本文在塔里木盆地南部沙漠绿洲过渡带采集了柽柳的盘状标本。我们使用树木年代学技术对样品进行处理，并建立了树木年轮宽度年代学。生长-气候关系分析表明，柽柳径向生长与前一年秋、冬、今春、初夏最低气温呈显著正相关；(2)冬末、当年春、初夏降水；(3)上一年深秋、今春、初夏的干旱。移动相关分析表明，约束季节柽柳径向生长与最低气温的关系逐渐增强，与降水、干旱指数的关系普遍减弱。上述结果表明，柽柳的生长得益于当前的气候条件，其生态防护林功能可能得到改善。

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引用次数: 0

Shrub-ring reconstruction of precipitation in the southeast of Tengger Desert, northwest China and its relationship with dust storm events 腾格里沙漠东南部降水的灌木环重建及其与沙尘暴事件的关系

IF 2.3 3区农林科学 Q1 FORESTRY

Dendrochronologia

Pub Date : 2025-10-06 DOI: 10.1016/j.dendro.2025.126426

Ai-Jun Ding , Sheng-Chun Xiao , Xiao-Mei Peng , Quan-Yan Tian

The transition from spring to summer marks the peak season for sandstorms in northern China, primarily driven by limited precipitation. However, a lack of long-term instrumental data and short monitoring records has impeded a comprehensive understanding of historical precipitation changes in arid desert regions. In this study, we reconstructed the April-May total precipitation history (1915–2017) using shrub ring data from two sites located on the southeastern edge of the Tengger Desert. Since 1915, the region has experienced four major drought periods (the 1920s, 1937–1962, the 1970s, and the 2000s) and one wet period (1983–1991). The reconstructed series shows a significant negative correlation with the variation in the number of dust storm days in China from March to May. Notably, the drought years of 1957, 1973, 2000–2001, and 2006, which were accompanied by frequent dust storm events, correspond closely with the reconstructed data. This alignment suggests that other identified years, including 1917, 1937, 1940–1942, 1951, and 1953, likely also experienced frequent dust days.

从春季到夏季的过渡标志着中国北方沙尘暴的高峰期，主要是由有限的降水驱动的。然而，长期仪器数据和短期监测记录的缺乏阻碍了对干旱沙漠地区历史降水变化的全面了解。本研究利用腾格里沙漠东南缘两个站点的灌木环数据重建了4 - 5月的总降水历史（1915-2017）。自1915年以来，该地区经历了四个主要干旱期（1920年代、1937-1962年、1970年代和2000年代）和一个湿润期（1983-1991年）。重建序列与3 ~ 5月中国沙尘暴日数变化呈显著负相关。值得注意的是，1957年、1973年、2000-2001年和2006年的干旱年份，伴随着频繁的沙尘暴事件，与重建的数据非常吻合。这种排列表明，其他确定的年份，包括1917年、1937年、1940-1942年、1951年和1953年，可能也经历了频繁的沙尘日。

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引用次数: 0

Complex growth responses of riparian tree species to dam-related hydrological alterations at their climatic niche limits 河岸树种在其气候生态位极限下对大坝相关水文变化的复杂生长响应

IF 2.3 3区农林科学 Q1 FORESTRY

Dendrochronologia

Pub Date : 2025-10-03 DOI: 10.1016/j.dendro.2025.126425

Irati Sanz-Zubizarreta , Idoia Biurrun , Nere Amaia Laskurain , Patricia María Rodríguez-González

Artificial dams disrupt natural river flows, endangering riparian trees and their ecosystems. We studied the impact of a dam located in the transition from temperate to Mediterranean climate in SW Europe. We used dendrochronological analysis on 250 individuals of three widespread riparian tree species (Alnus glutinosa, Fraxinus angustifolia, F. excelsior) to evaluate their growth responses to climatic and dam-related hydrological changes. Growth patterns differed among species, with Alnus glutinosa showing a stable tendency, while both Fraxinus species exhibited greater variability. Temperature was the most limiting factor for the three species, but climate-growth relationship was species-specific. The increase in the average annual temperature favoured Alnus glutinosa and F. angustifolia but limited F. excelsior growth, revealing the vulnerability to rising temperatures of F. excelsior rear-edge populations in the warmest margins of the species climatic niche. Additionally, rising summer temperatures reduced the growth of Alnus glutinosa and Fraxinus angustifolia in the sub-Mediterranean zone. The dam altered the river’s hydrology, changing a unimodal annual flow pattern to a bimodal one with higher summer water discharge. This shift favoured the annual growth of dam-affected Alnus glutinosa and Fraxinus angustifolia trees. However, the resilience and resistance of the latter to cope with dry years significantly decreased after the dam’s construction compared with the control sections. This may place a long-term risk for key structural trees in these riparian ecosystems, especially under climate change scenarios with increasing droughts, underscoring the importance of implementing ecological flow regimes as a mitigation strategy.

人工水坝破坏河流的自然流动，危及河岸树木及其生态系统。我们研究了位于欧洲西南部从温带气候向地中海气候过渡的一座大坝的影响。本文对三种分布广泛的河岸树种（Alnus glutinosa, Fraxinus angustifolia， F. excelsior）的250株树木进行了年代学分析，以评估其生长对气候和大坝水文变化的响应。不同树种间的生长模式存在差异，Alnus glutinosa表现出稳定的趋势，而两种黄曲霉都表现出较大的变异性。温度是3种植物的最大限制因子，但气候-生长关系存在物种特异性。年平均气温的升高有利于黄桤木（Alnus glutinosa）和金针叶桤木（F. angustifolia）的生长，但限制了黄针叶桤木（F. excelsior）的生长，揭示了黄针叶桤木后缘种群在物种气候生态位最温暖边缘对温度升高的脆弱性。此外，夏季气温的升高降低了亚地中海地区的Alnus glutinosa和Fraxinus angustifolia的生长。大坝改变了河流的水文，将单峰年流量模式转变为夏季水量较大的双峰流量模式。这种转变有利于受水坝影响的桤木和白蜡树的年生长。然而，大坝建设后，后者对干旱年的抗逆性和抗逆性较对照段明显下降。这可能给这些河岸生态系统中的关键结构树木带来长期风险，特别是在干旱日益加剧的气候变化情景下，这突出了作为缓解战略实施生态流量制度的重要性。

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引用次数: 0

Establishing ring width and cell chronologies for predicting future growth of Thuja koraiensis under climate change 建立环宽和细胞年代学，预测气候变化下红树的未来生长

IF 2.3 3区农林科学 Q1 FORESTRY

Dendrochronologia

Pub Date : 2025-10-02 DOI: 10.1016/j.dendro.2025.126423

Jun-Hui Park , En-Bi Choi , Ho-Young Lee , Jeong-Wook Seo

The present study reports the first dendrochronological analysis of a vulnerable conifer shrub, Thuja koraiensis, which is endemic to the Korean Peninsula. Two study sites, Hwangcheolbong and Gwittaegicheongbong, were selected, and ring-width chronologies were established for each site: 188 years (1836–2023) for the former and 113 years (1911–2023) for the latter. Additionally, cell chronologies of specific anatomical parameters, viz., cell diameter, lumen diameter, and cell wall thickness were also built from 1947–2023 for the Gwittaegicheongbong site. Correlation analysis revealed that the ring-width growth of T. koraiensis is primarily influenced negatively by temperatures in May and June, and positively by precipitation. Although similar results were found in the correlation analysis between the cell chronologies of cell and lumen diameters and monthly climate at Gwittaegicheongbong, the correlation with May and June temperatures were higher (r = -0.27 to −0.35) than ones of ring-width chronologies (r = -0.18 to −0.28). Future ring-width growth predictions using ARIMAX models under SSP scenarios revealed site- and parameter-specific differences. At Hwangcheolbong, ring width was predicted to decline by 13.9 % under SSP2–4.5 and by 39.0 % under SSP5–8.5 by 2100, with most of the reduction occurring after 2050 (-29.4 %). At Gwittegicheongbong, ring width remained stable under SSP2–4.5 (+1.7 %) but declined under SSP5–8.5 (-19.0 %). For cell parameters at Gwittegicheongbong, cell diameter decreased by 2.2 % under SSP2–4.5 and 15.3 % under SSP5–8.5, while lumen diameter showed the steepest decline (-23.3 %) under SSP5–8.5, indicating reduced hydraulic efficiency in high-emission scenarios. These findings highlight the climatic vulnerability of T. koraiensis and demonstrate the importance of dendroanatomical approaches for detecting climate-induced stress in alpine shrubs. Such insights provide critical information for the conservation of Korea’s subalpine ecosystems.

本研究报告了朝鲜半岛特有的一种易损针叶树灌木——红树（Thuja koraiensis）的首次树木年代学分析。选择黄铁峰和桂太清峰两个研究地点，分别建立了188年（1836-2023年）和113年（1911-2023年）的环宽年表。此外，从1947年到2023年，还建立了具体解剖参数的细胞年表，即细胞直径、管腔直径和细胞壁厚度。相关分析表明，5月和6月气温对红松环宽生长的影响主要为负，降水对其生长的影响主要为正。虽然在桂太池青峰的细胞和管腔直径年代学与月气候的相关性分析中发现了类似的结果，但与5月和6月气温的相关性（r = -0.27 ~ - 0.35）高于环宽年代学（r = -0.18 ~ - 0.28）。在SSP情景下使用ARIMAX模型进行的未来环宽增长预测揭示了特定地点和参数的差异。在黄铁峰，到2100年，在SSP2-4.5和SSP5-8.5下，环宽预计分别减少13.9 %和39.0 %，其中大部分减少发生在2050年之后（-29.4 %）。在Gwittegicheongbong，环宽在SSP2-4.5下保持稳定（+1.7 %），在SSP5-8.5下下降（-19.0 %）。对于Gwittegicheongbong的池参数，在SSP2-4.5和SSP5-8.5下，池直径分别下降了2.2 %和15.3 %，而管腔直径在SSP5-8.5下下降幅度最大（- 23.3% %），表明在高排放情景下水力效率降低。这些发现突出了红松的气候脆弱性，并证明了树木解剖学方法在高山灌木中检测气候诱导胁迫的重要性。这些见解为保护韩国的亚高山生态系统提供了重要信息。

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引用次数: 0

Cumulative droughts and legacy effects decreased long-term growth resilience in Pinus massoniana in the middle Dabie Mountains 大别山中游马尾松的长期生长恢复力因累积干旱和遗留效应而下降

IF 2.3 3区农林科学 Q1 FORESTRY

Dendrochronologia

Pub Date : 2025-10-01 DOI: 10.1016/j.dendro.2025.126424

Yameng Liu , Jinkuan Li , Jianfeng Peng , Jiaxin Li , Xiaoxu Wei , Keyu Zhang

Global warming has increased the frequency and intensity of droughts, thereby increasing the risk of forest decline and mortality. Although the negative impacts of drought on tree growth have been extensively studied, the mechanisms underlying tree growth resilience to cumulative drought effects and legacy responses remain poorly understood. Using tree-ring width and basal area increment analyses in the Dabie Mountains ecotone, a critical climate transition zone in China, we reveal that: (1) High-temperature-induced drought stress during mid-growing season (June-July) result in the primary constraint on radial growth because of the strong positive correlation between radial growth and the Standardized Precipitation Evapotranspiration Index, highlighting the vulnerability to drought of trees in this transition-zone; (2) A fundamental trade-off between resistance and recovery shapes drought resilience: increasing drought frequency reduces resistance but enhances recovery, while drought intensity effects are context-dependent, collectively driving nonlinear responses; (3) Drought legacy effects induce persistent radial growth decline through reduced biomass accumulation. These findings provide critical ecophysiological insights for modeling forest resilience in transitional ecosystems under climate change scenarios.

全球变暖增加了干旱的频率和强度，从而增加了森林退化和死亡率的风险。尽管干旱对树木生长的负面影响已经得到了广泛的研究，但树木生长对累积干旱影响和遗留响应的恢复能力机制仍然知之甚少。通过对大别山过渡带的树轮宽度和基面积增量分析，发现：(1)生长季中期（6 ~ 7月）的高温干旱胁迫是影响树木径向生长的主要因素，径向生长与标准化降水蒸散指数呈显著正相关，突出了过渡带树木对干旱的脆弱性；(2)抗旱性和恢复性之间的基本权衡决定了抗旱性：干旱频率的增加降低了抗旱性，但增强了抗旱性，而干旱强度的影响依赖于环境，共同驱动非线性响应；(3)干旱遗留效应通过减少生物量积累导致持续的径向生长下降。这些发现为气候变化情景下过渡生态系统森林恢复力的建模提供了重要的生态生理学见解。

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引用次数: 0

An 831-year pine tree-ring chronology from Northern Belarus reveals historical timber trade routes to the Baltic and beyond 一份来自白俄罗斯北部831年的松树年轮年表揭示了通往波罗的海及其他地区的历史木材贸易路线

IF 2.3 3区农林科学 Q1 FORESTRY

Dendrochronologia

Pub Date : 2025-09-29 DOI: 10.1016/j.dendro.2025.126421

Maxim Yermokhin , Māris Zunde

Since the early medieval period wide and slow-moving Dzvina River (known as Zapadnaya Dvina in Russia and Daugava in Latvia) and its forested tributaries were key route to transporting timber from the upper Dzvina and Dnieper basins to Riga, and further to Western Europe. As a result, timber also from the territory of present-day Belarus appears in many European timber collections as “Baltic oak” and “Riga pines”. To trace this historic trade route and to further dating of undated wooden structures, we developed a new 831-year Scots pine (Pinus sylvestris L.) tree-ring chronology (BY03b) using samples from living trees, historic, and archaeological timber from northern Belarus. These include samples from Polatsk and Vitsebsk archaeological excavations, historical buildings in Polatsk, and samples from Riga’s Dannenstern House which was built from the timber imported from the middle part of Dzvina basin. The BY03b chronology aligns well with modern tree-ring datasets from eastern Latvia, Lithuania, Estonia, and western Belarus, though these links weaken near the coast of the Baltic Sea. Our evidence suggests the pine timber trade between the upper and lower Dzvina / Daugava basin began in the 14th century and peaked in the 16th–17th centuries. As a result, many historical sites in Riga consist of timber from Belarus. In addition, timber from northern Belarus was used to build Danson House and Lytham Hall in the United Kingdom in the 18th century, located 2000 kilometers from the region of timber origins, confirming the very long-distance export of Belarusian timber throughout Europe. Thus, this new Belarusian multi-century pine chronology provides an exclusive basis for tracing precisely in time the trade connections of pine timber exported from the Dzvina / Daugava (and possibly Dnieper) basin to Western Europe via Riga in 14th – 19th centuries.

自中世纪早期以来，宽阔而缓慢的德兹维纳河（在俄罗斯被称为Zapadnaya Dvina，在拉脱维亚被称为道加瓦河）及其森林支流是将木材从德兹维纳河上游和第聂伯河流域运送到里加，并进一步运送到西欧的关键路线。因此，来自今天白俄罗斯境内的木材也出现在许多欧洲木材收藏中，称为“波罗的海橡木”和“里加松树”。为了追踪这条历史贸易路线，并进一步确定未确定年代的木结构的年代，我们利用来自白俄罗斯北部的活树、历史和考古木材的样本，开发了一种新的831年的苏格兰松（Pinus sylvestris L.）年轮年表（BY03b）。这些样本包括来自Polatsk和Vitsebsk考古发掘的样本，Polatsk的历史建筑样本，以及来自里加的Dannenstern住宅的样本，该住宅的木材是从Dzvina盆地中部进口的。BY03b年表与来自拉脱维亚东部、立陶宛、爱沙尼亚和白俄罗斯西部的现代树木年轮数据非常吻合，尽管这种联系在波罗的海沿岸附近减弱了。我们的证据表明，Dzvina / Daugava盆地上下之间的松材贸易始于14世纪，并在16 - 17世纪达到顶峰。因此，里加的许多历史遗迹都是由白俄罗斯的木材组成的。此外，在18世纪，来自白俄罗斯北部的木材被用于建造英国的Danson House和Lytham Hall，这些建筑距离木材产地2000公里，证实了白俄罗斯木材在整个欧洲的长距离出口。因此，这一新的白俄罗斯多世纪松树年表为精确追踪14 - 19世纪从兹维纳/道加瓦（也可能是第聂伯河）盆地出口到西欧的松材贸易联系提供了一个独特的基础。

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引用次数: 0

Growth patterns and responses to climate variability of Subantarctic Pilgerodendron uviferum forests in the Aysén (∼47–48°S) and Magallanes (∼53°S) regions, southern Patagonia 巴塔哥尼亚南部ays<s:1>（~ 47 ~ 48°S）和Magallanes（~ 53°S）地区亚南极毛毛针林的生长模式及其对气候变率的响应

IF 2.3 3区农林科学 Q1 FORESTRY

Dendrochronologia

Pub Date : 2025-09-29 DOI: 10.1016/j.dendro.2025.126422

Isabella Aguilera-Betti , Juan-Carlos Aravena , Ricardo Villalba , Catalina Fernández-García , Christian Bringas , Álvaro González-Reyes

The temperate forests of southern Chile are unique and complex ecosystems, threatened by climate change and anthropogenic activities. One of the long-lived and endemic species of these forests is the Guaitecas Cypress (Pilgerodendron uviferum), the southernmost conifer in the world, with a latitudinal distribution between 39 and 55°S, from temperate rainy to Subantarctic climates, being an ideal model for studying the response of tree species to climate in high latitudes. The objective of this study is to determine the growth patterns of P. uviferum forests in Chilean regions of Aysén (∼47–48°S) and Magallanes (∼53°S) using ring-width chronologies of four and six forests in Aysén and Magallanes, respectively. A Principal Component Analysis identified two dominant patterns: PC1 associated with Magallanes chronologies, and PC2 with Aysén chronologies. Using ERA5-Land data (1979–2020), both components showed positive correlations with precipitation and negative correlations with temperature. PC1 was positively related to soil water content, while PC2 negatively. Contrasting responses were found with large-scale forcings, where PC1 was negatively correlated with AAO and PDO, and positively correlated with SOI, while PC2 showed the opposite pattern. Spectral analyses reinforce these results, showing regional differences in the growth patterns of P. uviferum. This opposite relationship suggests that regional growth patterns of P. uviferum are influenced by large-scale modes of climate variability affecting southern South American climates. These results highlight the potential of P. uviferum chronologies to represent the large-scale climate variability of southern South America and to recover the low-frequency signal in climate reconstructions from this species.

智利南部的温带森林是独特而复杂的生态系统，受到气候变化和人为活动的威胁。Guaitecas柏树（Pilgerodendron uviferum）是世界上最南端的针叶树，其纬度分布在39 ~ 55°S之间，从温带多雨气候到亚南极气候，是研究高纬度地区树种对气候响应的理想模型。本研究的目的是利用分别在ayssamen和Magallanes的4个和6个森林的环宽年表，确定智利ayssamen（~ 47-48°S）和Magallanes（~ 53°S）地区的P. uviferum森林的生长模式。主成分分析确定了两种主要模式：PC1与Magallanes年表相关，PC2与ays年表相关。利用ERA5-Land数据（1979-2020），两个分量与降水呈正相关，与温度呈负相关。PC1与土壤含水量呈正相关，PC2与土壤含水量呈负相关。在大尺度强迫中，PC1与AAO和PDO呈负相关，与SOI呈正相关，而PC2则相反。光谱分析加强了这些结果，显示了葡萄树生长模式的区域差异。这种相反的关系表明，葡萄树的区域生长模式受到影响南美南部气候的大尺度气候变率模式的影响。这些结果突出了uviferum年表在代表南美南部大尺度气候变率和恢复该物种气候重建中的低频信号方面的潜力。

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引用次数: 0

Tree-ring blue intensity and climate sensitivity: Exploring site and method-specific variations in southern Yukon, Canada 树木年轮蓝色强度和气候敏感性：在加拿大育空南部探索特定地点和方法的变化

IF 2.3 3区农林科学 Q1 FORESTRY

Dendrochronologia

Pub Date : 2025-09-20 DOI: 10.1016/j.dendro.2025.126420

Yonghong Zheng , Rob Wilson , Mingjun Wang , Emily Reid

Tree-ring blue intensity (BI), a substitute for tree-ring density, has gained increasing attention in recent years as a robust tree-ring proxy for climate reconstruction. However, it still presents considerable uncertainty due to its status as a relatively new tree-ring parameter with limitations related to sample discolouration issues and image resolution. This study aims to identify the climate information embedded in different tree-ring parameters measured from white spruce samples and examine whether the relationship between tree-ring parameters and climate is impacted by altitude, image resolution, and BI data collection method. By measuring ring width (RW), earlywood blue intensity (EWBI), latewood blue intensity (LWBI), and delta blue intensity (DBI) at higher (1065 m a.s.l.) and lower (965 m a.s.l.) sites in southern Yukon, we found that LWBI and DBI show a significantly stronger climate signal over RW, especially at high frequencies, aligning with previous climate studies. The upper site performed better than the lower site, agreeing with the expectation that the climate response will increase for sites closer to tree-line. While higher-resolution methods like the Advanced Tree-Ring Image Capturing System (ATRICS) did not outperform the scanner method, further testing is needed. Additionally, both the mean of sorted pixels (Pix) method and the mean of slices (Slc) method have their strength in DBI chronologies, but further testing is recommended to optimize data selection methods.

近年来，树木年轮蓝强度（BI）作为替代树木年轮密度的一种可靠的气候重建指标受到越来越多的关注。然而，由于其作为一个相对较新的树轮参数的地位，它仍然存在相当大的不确定性，并且与样品变色问题和图像分辨率有关。本研究旨在识别从白云杉样本中测量的不同树木年轮参数中嵌入的气候信息，并研究树木年轮参数与气候之间的关系是否受到海拔、图像分辨率和BI数据收集方法的影响。通过对育空南部较高（1065 m a.s.l.）和较低（965 m a.s.l.）的环宽（RW）、早木蓝强度（EWBI）、晚木蓝强度（LWBI）和三角洲蓝强度（DBI）的测量，我们发现LWBI和DBI在育空南部表现出明显更强的气候信号，特别是在高频处，这与以往的气候研究结果一致。海拔较高的地点比海拔较低的地点表现得更好，这与接近树线的地点气候响应会增加的预期相一致。虽然像高级树轮图像捕获系统（ATRICS）这样的高分辨率方法的性能并不优于扫描仪方法，但还需要进一步的测试。此外，排序像素平均值（Pix）方法和切片平均值（Slc）方法在DBI年表中都有其优势，但建议进一步测试以优化数据选择方法。

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引用次数: 0

Linking wood formation and non-structural carbohydrate dynamics in Larix olgensis along an elevational gradient 落叶松木材形成与非结构性碳水化合物动态在海拔梯度上的联系

IF 2.3 3区农林科学 Q1 FORESTRY

Dendrochronologia

Pub Date : 2025-09-06 DOI: 10.1016/j.dendro.2025.126418

Nipeng Qian , Gangdun Li , Linxu Wang , Chunchao Dong , Kuan Shi , Asghar Ali , Guang Zhou , Qijing Liu

Understanding the interplay between wood formation and non-structural carbohydrate (NSC) dynamics is essential to identifying the drivers of tree growth under changing climates. In this study, we investigated intra-annual wood formation in the stems of Larix olgensis across a 700 m elevational gradient on Changbai Mountain, Northeast China, during the 2023 growing season. Weekly microcoring was performed on 35 trees at seven elevations to assess cambial phenology and wood formation, while NSC (soluble sugar and starch) concentrations were measured in needles, branches, coarse roots, phloem (stem), xylem from 20 trees at four elevations over seven sampling dates. We found that the onset of cell enlargement, wall-thickening, and lignification was significantly delayed with increasing elevation, and closely predicted by temperature and GDD. In contrast, growth cessation showed no consistent variation across elevations and unrelated to temperature, but was better explained by CDD. Despite a shortened growing season at higher elevations, NSC concentrations in most organs exhibited similar seasonal patterns across sites. NSC levels in needles, branches, and roots reached their lowest during peak cell enlargement in mid-June, indicating high sink demand, while xylem NSC peaked early and declined steadily thereafter. Our results demonstrate the critical role of thresholds in regulating the onset and cessation of wood formation. The temporal alignment between NSC dynamics and cambial activity suggests a functional coupling between carbon availability and sink demand. These findings advance our understanding of the environmental control of growth phenology and carbon use in boreal conifers across elevational gradients.

了解木材形成与非结构碳水化合物（NSC）动态之间的相互作用对于确定气候变化下树木生长的驱动因素至关重要。以长白山700 m海拔梯度的长白松（Larix olgensis）为研究对象，研究了长白山落叶松2023年生长季的年际木材形成情况。每周对7个海拔高度的35棵树进行微芯取样，以评估形成层物候和木材形成，同时在7个采样日期内测量4个海拔高度的20棵树的针叶、树枝、粗根、韧皮部（茎）、木质部的NSC（可溶性糖和淀粉）浓度。我们发现，随着海拔的升高，细胞增大、壁增厚和木质化的发生明显延迟，并且与温度和GDD密切相关。相比之下，生长停止在不同海拔没有一致的变化，与温度无关，但CDD可以更好地解释。尽管高海拔地区生长季节缩短，但大多数器官的NSC浓度在不同地点表现出相似的季节性模式。针叶、枝和根的NSC水平在6月中旬细胞增大高峰时达到最低，表明对碳汇的需求较高，而木质部的NSC在6月中旬达到峰值，此后逐渐下降。我们的结果证明了阈值在调节木材形成的开始和停止中的关键作用。NSC动态和形成层活动之间的时间一致性表明碳有效性和汇需求之间存在功能耦合。这些发现促进了我们对不同海拔梯度北方针叶树生长物候和碳利用的环境控制的理解。

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引用次数: 0