Pub Date : 2025-09-03DOI: 10.1016/j.dendro.2025.126406
Mauricio Montiel , Mauro E. González , Ariel A. Muñoz , Duncan A. Christie , Paul R. Sheppard
We assessed anatomical and dendrochemical variations in Nothofagus pumilio annual tree–rings from Andean forests in Northern Patagonia following two VEI ≥ 3 eruptions of the Puyehue–Cordón Caulle Volcanic Complex in 1921–22 and 2011. White rings formed due to tephra–induced defoliation showed decreased or unchanged vessel lumen diameter, increased vessel density, increased fiber lumen diameter, and reduced fiber wall thickness, suggesting reduced structural resistance. Dendrochemical analysis revealed increased concentrations of Mg, Al, K, Ca, Ni, Ba, and Fe in 1921, and Mg, K, Ca, Mn, Cu, Zn, and Ba in 2011. While some elements retained in tree rings align with tephra composition, short–term leaching of soluble elements in tephra likely influenced their final distribution. Differences in chemical responses between eruptions are attributed to seasonal timing and tree phenology. We discuss the potential mechanisms of chemical element uptake and translocation in trees following tephra fall, highlighting the role of bark and roots in soil–plant interactions. These findings provide new insights into the dynamic interactions between trees and deposited tephra, as well as understanding the behavior of chemical elements absorbed in the short term. This information could be useful for the reconstruction of past volcanic eruptions and for understanding ecosystem responses to volcanic disturbances.
{"title":"Chemical and anatomical signals of past volcanic eruptions in tree–ring records from Northern Patagonia","authors":"Mauricio Montiel , Mauro E. González , Ariel A. Muñoz , Duncan A. Christie , Paul R. Sheppard","doi":"10.1016/j.dendro.2025.126406","DOIUrl":"10.1016/j.dendro.2025.126406","url":null,"abstract":"<div><div>We assessed anatomical and dendrochemical variations in <em>Nothofagus pumilio</em> annual tree–rings from Andean forests in Northern Patagonia following two VEI ≥ 3 eruptions of the Puyehue–Cordón Caulle Volcanic Complex in 1921–22 and 2011. White rings formed due to tephra–induced defoliation showed decreased or unchanged vessel lumen diameter, increased vessel density, increased fiber lumen diameter, and reduced fiber wall thickness, suggesting reduced structural resistance. Dendrochemical analysis revealed increased concentrations of Mg, Al, K, Ca, Ni, Ba, and Fe in 1921, and Mg, K, Ca, Mn, Cu, Zn, and Ba in 2011. While some elements retained in tree rings align with tephra composition, short–term leaching of soluble elements in tephra likely influenced their final distribution. Differences in chemical responses between eruptions are attributed to seasonal timing and tree phenology. We discuss the potential mechanisms of chemical element uptake and translocation in trees following tephra fall, highlighting the role of bark and roots in soil–plant interactions. These findings provide new insights into the dynamic interactions between trees and deposited tephra, as well as understanding the behavior of chemical elements absorbed in the short term. This information could be useful for the reconstruction of past volcanic eruptions and for understanding ecosystem responses to volcanic disturbances.</div></div>","PeriodicalId":50595,"journal":{"name":"Dendrochronologia","volume":"94 ","pages":"Article 126406"},"PeriodicalIF":2.3,"publicationDate":"2025-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145020458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-08-28DOI: 10.1016/j.dendro.2025.126402
Siqin Zhao , Shuheng Li , Qi Liu , Le Li , Yiqi Zhao , Maoxin Du , Ziyi Yang , Fei Hu , Zhiqi Zhang , Jiahao Guo
The alpine treeline ecotone is highly sensitive to climate change, and global warming will influence both the recruitment of the populations at the upper elevation limit and the position of the treeline. In this study, two vertical sample transects were set up on the northern slope of Taibai Mountain, the highest peak in the Qinling Mountains. Using the "tree rings + plot survey" method, we statistically analyzed the population characteristics of Larix chinensis, population recruitment, and the spatiotemporal changes in the treeline position. The results indicate differences in the growth of Larix chinensis trees and population recruitment across the vertical sample transects on different slopes, but both populations exhibit growth. Population recruitment of Larix chinensis is closely correlated with temperature, particularly during the growing season from March to April. Additionally, the rate of population growth is synchronized with the reconstructed temperature of the Qinling Mountains and the Northern Hemisphere. Over the past century, the treelines at the two sample transects on Taibai Mountain have shown an upward trend, rising by 23.2 m and 16.3 m, respectively. Although the climbing distances differ, both transects show rapid elevation gains during two relatively warm periods: the 1940s-1960s and 1980s-2000s.
{"title":"Response of treeline dynamics to climate change on the northern slope of Taibai Mountain, China","authors":"Siqin Zhao , Shuheng Li , Qi Liu , Le Li , Yiqi Zhao , Maoxin Du , Ziyi Yang , Fei Hu , Zhiqi Zhang , Jiahao Guo","doi":"10.1016/j.dendro.2025.126402","DOIUrl":"10.1016/j.dendro.2025.126402","url":null,"abstract":"<div><div>The alpine treeline ecotone is highly sensitive to climate change, and global warming will influence both the recruitment of the populations at the upper elevation limit and the position of the treeline. In this study, two vertical sample transects were set up on the northern slope of Taibai Mountain, the highest peak in the Qinling Mountains. Using the \"tree rings + plot survey\" method, we statistically analyzed the population characteristics of <em>Larix chinensis</em>, population recruitment, and the spatiotemporal changes in the treeline position. The results indicate differences in the growth of Larix chinensis trees and population recruitment across the vertical sample transects on different slopes, but both populations exhibit growth. Population recruitment of <em>Larix chinensis</em> is closely correlated with temperature, particularly during the growing season from March to April. Additionally, the rate of population growth is synchronized with the reconstructed temperature of the Qinling Mountains and the Northern Hemisphere. Over the past century, the treelines at the two sample transects on Taibai Mountain have shown an upward trend, rising by 23.2 m and 16.3 m, respectively. Although the climbing distances differ, both transects show rapid elevation gains during two relatively warm periods: the 1940s-1960s and 1980s-2000s.</div></div>","PeriodicalId":50595,"journal":{"name":"Dendrochronologia","volume":"94 ","pages":"Article 126402"},"PeriodicalIF":2.3,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144913834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-08-26DOI: 10.1016/j.dendro.2025.126399
Marcel Kunz , Rob Wilson , Emily Reid , Eileen Kuhl , Jan Esper
Non-stationary growth responses have been identified in tree-ring width (TRW) and maximum latewood density (MXD) chronologies of north-west North America. Here, we present MXD and latewood blue intensity (LWBI) data from two areas of the Yukon Territory (YT) to explore divergent climate-growth relationships until 2021 CE and evaluate the underlying reasons considering different detrending methods and instrumental datasets. We examine divergent long-term trends and changing inter-annual signals using well-replicated chronologies integrating a mixture of young and mature trees. Both tree-ring parameters correlate significantly (p < 0.05) with May–August temperatures, but the MXD results are stronger and show less divergence in trend. Variability among differently detrended MXD chronologies is smaller and a signal-free version of age-dependent spline detrending appears to be optimal for both YT sites. Comparison of instrumental data products reveals that the highest and most stable correlations are achieved using the Berkeley Earth dataset. Additionally, using different sub-diurnal temperatures affects both trend and correlation divergence with maximum temperature consistently showing the strongest and minimum temperature the weakest results. We conclude that regional divergence in the YT is characterized by trend rather than high-frequency issues and is larger in LWBI than MXD data. Altering detrending methods and diurnal temperatures is of greater importance than varying instrumental data products. Most stationary responses are recorded when applying signal-free age-dependent spline detrending to tree-ring data and targeting Berkeley Earth maximum temperatures. Disregarding these methodological choices may amplify divergence in YT MXD and LWBI calibration models.
{"title":"Exploring potential drivers of divergence in tree-ring based temperature reconstructions of NW North America","authors":"Marcel Kunz , Rob Wilson , Emily Reid , Eileen Kuhl , Jan Esper","doi":"10.1016/j.dendro.2025.126399","DOIUrl":"10.1016/j.dendro.2025.126399","url":null,"abstract":"<div><div>Non-stationary growth responses have been identified in tree-ring width (TRW) and maximum latewood density (MXD) chronologies of north-west North America. Here, we present MXD and latewood blue intensity (LWBI) data from two areas of the Yukon Territory (YT) to explore divergent climate-growth relationships until 2021 CE and evaluate the underlying reasons considering different detrending methods and instrumental datasets. We examine divergent long-term trends and changing inter-annual signals using well-replicated chronologies integrating a mixture of young and mature trees. Both tree-ring parameters correlate significantly (<em>p</em> < 0.05) with May–August temperatures, but the MXD results are stronger and show less divergence in trend. Variability among differently detrended MXD chronologies is smaller and a signal-free version of age-dependent spline detrending appears to be optimal for both YT sites. Comparison of instrumental data products reveals that the highest and most stable correlations are achieved using the Berkeley Earth dataset. Additionally, using different sub-diurnal temperatures affects both trend and correlation divergence with maximum temperature consistently showing the strongest and minimum temperature the weakest results. We conclude that regional divergence in the YT is characterized by trend rather than high-frequency issues and is larger in LWBI than MXD data. Altering detrending methods and diurnal temperatures is of greater importance than varying instrumental data products. Most stationary responses are recorded when applying signal-free age-dependent spline detrending to tree-ring data and targeting Berkeley Earth maximum temperatures. Disregarding these methodological choices may amplify divergence in YT MXD and LWBI calibration models.</div></div>","PeriodicalId":50595,"journal":{"name":"Dendrochronologia","volume":"94 ","pages":"Article 126399"},"PeriodicalIF":2.3,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144913835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-08-26DOI: 10.1016/j.dendro.2025.126400
Yue Fan , Yujian Zhang , Siyu Liu , Chenhui Qu , Dongqing Han , Yanhong Liu
As rising temperatures and increasing drought pose serious risks to forest ecosystems, understanding the spatial patterns of tree growth–climate responses is crucial for predicting and mitigating the impacts of climate change. In this study, we employ an integrative analysis approach to establish a comprehensive database of 190 tree ring growth–climate relationships for Pinus tabuliformis. Findings indicate that increased precipitation during the previous summer and the current spring generally promotes tree growth, and higher temperatures from July to September of the previous year and May to July of the current year inhibit growth. Notably, P. tabuliformis populations in high-latitude or high-elevation regions are not exempt from the negative impacts of future warming. In addition, the growth–climate sensitivity of P. tabuliformis varies along temperature and precipitation gradients. As regional climates shift from warm and wet to cold and dry, the growth-limiting effect of the previous year’s summer precipitation and the current year’s growing-season precipitation intensifies, and the inhibitory impact of rising temperatures also increases. Importantly, the precipitation isohyet of 600 mm and the temperature isotherm of 10 °C seem to represent critical climatic thresholds for the radial growth response of P. tabuliformis to monthly climate changes. Our results suggest that, if current climate trends persist, the radial growth of P. tabuliformis in its western and northwestern distribution areas is expected to continue declining.
{"title":"Radial growth of Pinus tabuliformis is affected by climatic factors and site conditions on a regional scale: An integrative analysis based on tree-ring width data","authors":"Yue Fan , Yujian Zhang , Siyu Liu , Chenhui Qu , Dongqing Han , Yanhong Liu","doi":"10.1016/j.dendro.2025.126400","DOIUrl":"10.1016/j.dendro.2025.126400","url":null,"abstract":"<div><div>As rising temperatures and increasing drought pose serious risks to forest ecosystems, understanding the spatial patterns of tree growth–climate responses is crucial for predicting and mitigating the impacts of climate change. In this study, we employ an integrative analysis approach to establish a comprehensive database of 190 tree ring growth–climate relationships for <em>Pinus tabuliformis</em>. Findings indicate that increased precipitation during the previous summer and the current spring generally promotes tree growth, and higher temperatures from July to September of the previous year and May to July of the current year inhibit growth. Notably, <em>P. tabuliformis</em> populations in high-latitude or high-elevation regions are not exempt from the negative impacts of future warming. In addition, the growth–climate sensitivity of <em>P. tabuliformis</em> varies along temperature and precipitation gradients. As regional climates shift from warm and wet to cold and dry, the growth-limiting effect of the previous year’s summer precipitation and the current year’s growing-season precipitation intensifies, and the inhibitory impact of rising temperatures also increases. Importantly, the precipitation isohyet of 600 mm and the temperature isotherm of 10 °C seem to represent critical climatic thresholds for the radial growth response of <em>P. tabuliformis</em> to monthly climate changes. Our results suggest that, if current climate trends persist, the radial growth of <em>P. tabuliformis</em> in its western and northwestern distribution areas is expected to continue declining.</div></div>","PeriodicalId":50595,"journal":{"name":"Dendrochronologia","volume":"94 ","pages":"Article 126400"},"PeriodicalIF":2.3,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144921420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-08-26DOI: 10.1016/j.dendro.2025.126397
Chien Chen , Astor Toraño Caicoya , Eva Hufnagel , Joelle Claußen , Thomas Malzer , Stefan Gerth , Enno Uhl , Hans Pretzsch
Accurate delineations of pith positions, tree-ring boundaries, and sapwood areas are essential for understanding tree growth dynamics, dendrochronology, and tree physiological mechanisms. While X-ray imaging has been exploited for wood specimens, few standardized and open-source methods are available. We present a supportive semi-automatic protocol, integrating free software, R and ImageJ, for delineating pith, tree rings, and sapwood areas of moisture-preserved stem discs with relatively high pixel resolution (150 µm). The protocol, documented on GitHub, integrates automated algorithms with interactive interfaces from ImageJ for manual corrections, providing a flexible and user-friendly framework. Pith position is determined by circularly fitting most-inner tree ring boundaries from edge-detection algorithms. This unique position is then used for cleaning edge detection results, supporting the two-dimensional grouping of tree ring segments. The Sapwood area is delineated by the Gaussian blur filter and interactive threshold interface. We tested the protocol on images of 15 moisture-preserved stem discs from three species (Picea abies (L.) H. KARST., Pinus sylvestris L., and Larix decidua MILL.). Our research demonstrated reliable accuracy, achieving an average mean error of 0.54 ± 0.42 mm for pith detection, 0.66 ± 1.72 mm for tree-ring boundaries, and 0.68 ± 1.23 mm for sapwood boundaries, offering support for manual delineations. While the method reliably supports analyses for coniferous species, challenges remain for ring-porous species, which require further advancements. The study serves as a milestone toward the future development of mobile X-ray systems for living trees in forest environments, offering a standardized and adaptable approach for advancing dendrology and wood science.
{"title":"A semi-automatic protocol for delineating internal stem features from moisture-preserved discs using X-ray computed tomography","authors":"Chien Chen , Astor Toraño Caicoya , Eva Hufnagel , Joelle Claußen , Thomas Malzer , Stefan Gerth , Enno Uhl , Hans Pretzsch","doi":"10.1016/j.dendro.2025.126397","DOIUrl":"10.1016/j.dendro.2025.126397","url":null,"abstract":"<div><div>Accurate delineations of pith positions, tree-ring boundaries, and sapwood areas are essential for understanding tree growth dynamics, dendrochronology, and tree physiological mechanisms. While X-ray imaging has been exploited for wood specimens, few standardized and open-source methods are available. We present a supportive semi-automatic protocol, integrating free software, R and ImageJ, for delineating pith, tree rings, and sapwood areas of moisture-preserved stem discs with relatively high pixel resolution (150 µm). The protocol, documented on GitHub, integrates automated algorithms with interactive interfaces from ImageJ for manual corrections, providing a flexible and user-friendly framework. Pith position is determined by circularly fitting most-inner tree ring boundaries from edge-detection algorithms. This unique position is then used for cleaning edge detection results, supporting the two-dimensional grouping of tree ring segments. The Sapwood area is delineated by the Gaussian blur filter and interactive threshold interface. We tested the protocol on images of 15 moisture-preserved stem discs from three species (<em>Picea abies</em> (L.) H. KARST., <em>Pinus sylvestris</em> L., and <em>Larix decidua</em> MILL.). Our research demonstrated reliable accuracy, achieving an average mean error of 0.54 ± 0.42 mm for pith detection, 0.66 ± 1.72 mm for tree-ring boundaries, and 0.68 ± 1.23 mm for sapwood boundaries, offering support for manual delineations. While the method reliably supports analyses for coniferous species, challenges remain for ring-porous species, which require further advancements. The study serves as a milestone toward the future development of mobile X-ray systems for living trees in forest environments, offering a standardized and adaptable approach for advancing dendrology and wood science.</div></div>","PeriodicalId":50595,"journal":{"name":"Dendrochronologia","volume":"94 ","pages":"Article 126397"},"PeriodicalIF":2.3,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144916950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-08-26DOI: 10.1016/j.dendro.2025.126401
Ju-Mei Zhang , Zaw Zaw , Pei-Li Fu , Shankar Panthi , Jambay Dema , Tong-Liang Xu , Hui Zhang , Achim Bräuning , Ze-Xin Fan
Quantitative wood anatomy (QWA) provides valuable insights into the mechanisms underlying the responses of tree physiological processes to climate. Yet, the influence of climatic factors on the wood anatomical traits of coniferous tree species in the Hengduan Mountains remains poorly understood. This study investigated xylem anatomical traits (cell wall thickness, CWT; lumen area, LA) in four dominant coniferous species (Abies georgei, Larix potaninii var. macrocarpa, Picea brachytyla, and Pinus densata) from the subalpine forests of the central Hengduan Mountains. Using standard QWA protocols, we established chronologies for CWT and LA at both annual and intra-annual scales. Correlation analyses revealed that these xylem anatomical traits are significantly influenced by temperature and moisture conditions during early-to-peak growing season. Specifically, CWT is primarily constrained by low temperatures, while LA is limited by water availability. Responses of anatomical traits to climate factors exhibit multi-decadal scale instability, with LA showing increasing sensitivity to moisture variations in recent decades, likely associated with intensified drought stress under a warming climate. Furthermore, xylem anatomical responses to climate factors varied among the four species. CWT showed the strongest climatic sensitivity in A. georgei, LA responses were most prominent in A. georgei and P. densata, while both traits responded weakly in L. potaninii and P. brachytyla, reflecting their divergent adaptive strategies to habitat heterogeneity.
定量木材解剖（QWA）为树木生理过程对气候的响应机制提供了有价值的见解。然而，气候因子对横断山区针叶树木材解剖性状的影响尚不清楚。研究了横断山中部亚高山森林中4种优势针叶林物种(乔其冰（Abies georgei）、大落叶松（Larix potaninii var. macrocarpa）、短叶松（Picea brachytyla）和松（Pinus densata）的木质部解剖特征（细胞壁厚度，CWT，管腔面积，LA）。使用标准的QWA协议，我们在年度和年内尺度上建立了CWT和LA的年表。相关分析表明，在生长旺季前期，温度和湿度条件对这些木质部解剖性状有显著影响。具体来说，CWT主要受到低温的限制，而LA则受到水分供应的限制。解剖特征对气候因子的响应表现出多年代际尺度的不稳定性，近几十年来LA对湿度变化的敏感性增加，这可能与气候变暖下干旱胁迫加剧有关。此外，木质部解剖结构对气候因子的响应在四种植物中也存在差异。CWT对气候的敏感性表现出了极强的适应性，而对LA的响应则以乔其木和白杨最显著，而对potaninii和brachytyla的响应则较弱，反映了它们对生境异质性的不同适应策略。
{"title":"Climatic influences on annual and intra-annual xylem anatomical traits of four coniferous tree species in the central Hengduan Mountains, Southwest China","authors":"Ju-Mei Zhang , Zaw Zaw , Pei-Li Fu , Shankar Panthi , Jambay Dema , Tong-Liang Xu , Hui Zhang , Achim Bräuning , Ze-Xin Fan","doi":"10.1016/j.dendro.2025.126401","DOIUrl":"10.1016/j.dendro.2025.126401","url":null,"abstract":"<div><div>Quantitative wood anatomy (QWA) provides valuable insights into the mechanisms underlying the responses of tree physiological processes to climate. Yet, the influence of climatic factors on the wood anatomical traits of coniferous tree species in the Hengduan Mountains remains poorly understood. This study investigated xylem anatomical traits (cell wall thickness, CWT; lumen area, LA) in four dominant coniferous species (<em>Abies georgei</em>, <em>Larix potaninii</em> var. <em>macrocarpa</em>, <em>Picea brachytyla</em>, and <em>Pinus densata</em>) from the subalpine forests of the central Hengduan Mountains. Using standard QWA protocols, we established chronologies for CWT and LA at both annual and intra-annual scales. Correlation analyses revealed that these xylem anatomical traits are significantly influenced by temperature and moisture conditions during early-to-peak growing season. Specifically, CWT is primarily constrained by low temperatures, while LA is limited by water availability. Responses of anatomical traits to climate factors exhibit multi-decadal scale instability, with LA showing increasing sensitivity to moisture variations in recent decades, likely associated with intensified drought stress under a warming climate. Furthermore, xylem anatomical responses to climate factors varied among the four species. CWT showed the strongest climatic sensitivity in <em>A. georgei</em>, LA responses were most prominent in <em>A. georgei</em> and <em>P. densata</em>, while both traits responded weakly in <em>L. potaninii</em> and <em>P. brachytyla</em>, reflecting their divergent adaptive strategies to habitat heterogeneity.</div></div>","PeriodicalId":50595,"journal":{"name":"Dendrochronologia","volume":"94 ","pages":"Article 126401"},"PeriodicalIF":2.3,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144913833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-08-24DOI: 10.1016/j.dendro.2025.126398
Qinhua Tian , Jiazhi Qie , Yong Zhang
The long-term dry-wet changes in North China are of great interest because this area is a key region for industrial and agricultural production and lies at the northern edge of the East Asian monsoon. Abnormal summer rainfall here often triggers severe natural disasters such as floods and droughts, making this region a long-standing focus of scientific attention. However, the lack of long-term records of summer moisture variability has hindered a deeper understanding of the temporal and spatial dynamics of dry and wet conditions in this region. In this study, we present a 178-year (1839–2016 CE) tree-ring chronology developed from North China larch (Larix principis-rupprechtii) growing in the Lüliang Mountains. The tree-ring width indices correlate significantly with the June-August self-calibrating Palmer Drought Severity Index (sc-PDSI), enabling the reconstruction of summer moisture variability back to 1879 CE. The reconstruction model explains 52.7 % of the variance in moisture conditions during the calibration period (1960–2016 CE). Our results reveal pronounced fluctuations between dry and wet periods over the past 138 years. Since the 1960s, the region has experienced a gradual drying trend, with the extreme droughts around the year 2000 being the most severe in the reconstruction. Compared with previous studies, our findings highlight the strong potential of North China larch for reconstructing long-term summer moisture variability in this region.
{"title":"A tree-ring-based summer moisture reconstruction for the Lüliang Mountains, North China","authors":"Qinhua Tian , Jiazhi Qie , Yong Zhang","doi":"10.1016/j.dendro.2025.126398","DOIUrl":"10.1016/j.dendro.2025.126398","url":null,"abstract":"<div><div>The long-term dry-wet changes in North China are of great interest because this area is a key region for industrial and agricultural production and lies at the northern edge of the East Asian monsoon. Abnormal summer rainfall here often triggers severe natural disasters such as floods and droughts, making this region a long-standing focus of scientific attention. However, the lack of long-term records of summer moisture variability has hindered a deeper understanding of the temporal and spatial dynamics of dry and wet conditions in this region. In this study, we present a 178-year (1839–2016 CE) tree-ring chronology developed from North China larch <em>(Larix principis-rupprechtii)</em> growing in the Lüliang Mountains. The tree-ring width indices correlate significantly with the June-August self-calibrating Palmer Drought Severity Index (sc-PDSI), enabling the reconstruction of summer moisture variability back to 1879 CE. The reconstruction model explains 52.7 % of the variance in moisture conditions during the calibration period (1960–2016 CE). Our results reveal pronounced fluctuations between dry and wet periods over the past 138 years. Since the 1960s, the region has experienced a gradual drying trend, with the extreme droughts around the year 2000 being the most severe in the reconstruction. Compared with previous studies, our findings highlight the strong potential of North China larch for reconstructing long-term summer moisture variability in this region.</div></div>","PeriodicalId":50595,"journal":{"name":"Dendrochronologia","volume":"94 ","pages":"Article 126398"},"PeriodicalIF":2.3,"publicationDate":"2025-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144916951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-08-22DOI: 10.1016/j.dendro.2025.126396
Yulia A. Kholdaenko , Liliana V. Belokopytova , Dina F. Zhirnova , Santosh K. Shah , Nivedita Mehrotra , Elena A. Babushkina , Eugene A. Vaganov
In this study we analyzed the tree growth and the wood anatomical parameters of Picea obovata Ledeb. in an even-aged plantation in the southern taiga, Central Siberia. The samples were collected from six plots having planting densities from 750 to 96,000 trees/ha. Cell radial diameter (CRD) and cell wall thickness (CWT) were measured for the years 2000–2020. The chronologies of maximum and mean CRD and CWT were compared with the number of cells per radial row in the ring (N), tree-ring width (TRW) and basal area increment (BAI). Porosity of the wood was also calculated from CRD and CWT. A significant (p < 0.05) log-linear decrease in CRD with planting density was recorded. In the dense stands, calculated theoretical optimal values of CRD (average CRD for wide rings) were lower, and narrow rings (N < 50 cells) with suppressed CRD occurred frequently. An increase in optimal CWT with planting density was not significant. Suppressed CWT occurred only in the narrowest rings (N < 20 cells). This pattern was considered to be driven by: (1) hydraulic requirements to CRD being related to stand density through tree height, (2) requirements to CWT for safety of water conduction not depending on stand density; (3) legacy effect under stress, i.e., growth suppression at the stage of cell production impacting further cell differentiation. The positive relationship of latewood ratio with planting density, and the formation of less porous wood in dense stands as result of the variation in the anatomical structure has also been observed in previous studies. A more detailed analysis of tracheidograms (intra-seasonal curves of anatomical parameters) is suggested for further research to resolve ambiguity in relationships between stand density and wood anatomy.
{"title":"Wood anatomical structure of Picea obovata in plantation stands of different planting densities","authors":"Yulia A. Kholdaenko , Liliana V. Belokopytova , Dina F. Zhirnova , Santosh K. Shah , Nivedita Mehrotra , Elena A. Babushkina , Eugene A. Vaganov","doi":"10.1016/j.dendro.2025.126396","DOIUrl":"10.1016/j.dendro.2025.126396","url":null,"abstract":"<div><div>In this study we analyzed the tree growth and the wood anatomical parameters of <em>Picea obovata</em> Ledeb. in an even-aged plantation in the southern taiga, Central Siberia. The samples were collected from six plots having planting densities from 750 to 96,000 trees/ha. Cell radial diameter (CRD) and cell wall thickness (CWT) were measured for the years 2000–2020. The chronologies of maximum and mean CRD and CWT were compared with the number of cells per radial row in the ring (N), tree-ring width (TRW) and basal area increment (BAI). Porosity of the wood was also calculated from CRD and CWT. A significant (<em>p</em> < 0.05) log-linear decrease in CRD with planting density was recorded. In the dense stands, calculated theoretical optimal values of CRD (average CRD for wide rings) were lower, and narrow rings (N < 50 cells) with suppressed CRD occurred frequently. An increase in optimal CWT with planting density was not significant. Suppressed CWT occurred only in the narrowest rings (N < 20 cells). This pattern was considered to be driven by: (1) hydraulic requirements to CRD being related to stand density through tree height, (2) requirements to CWT for safety of water conduction not depending on stand density; (3) legacy effect under stress, i.e., growth suppression at the stage of cell production impacting further cell differentiation. The positive relationship of latewood ratio with planting density, and the formation of less porous wood in dense stands as result of the variation in the anatomical structure has also been observed in previous studies. A more detailed analysis of tracheidograms (intra-seasonal curves of anatomical parameters) is suggested for further research to resolve ambiguity in relationships between stand density and wood anatomy.</div></div>","PeriodicalId":50595,"journal":{"name":"Dendrochronologia","volume":"94 ","pages":"Article 126396"},"PeriodicalIF":2.3,"publicationDate":"2025-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144908806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-08-08DOI: 10.1016/j.dendro.2025.126395
Lucie Polášková, Radek Tichavský
Mining subsidence poses a significant threat to the environment, with surface deformations often resulting in the loss of original settlements. The degree of surface damage varies between areas of long-term, continuous mining and peripheral zones where only a limited number of coal seams have been mined. This study involved a comprehensive analysis of 145 Larix decidua Mill. trees across two sites with differing degrees of undermining. This study evaluates dendrogeomorphological dating methods using reaction wood (RW) and abrupt growth suppression (AGS) to reconstruct mining-induced subsidence. The analysis successfully identified subsidence events, including those occurring at significant distances of up to 1.3 km from mining activities. Key differences were observed between the two sites: the continuously affected site exhibited prolonged subsidence events linked to extensive mining, while the peripheral site recorded discrete, sudden events. These findings highlight the potential of dendrogeomorphology for reconstructing subsidence activity with high temporal and spatial resolution, particularly during periods of intense mining activity. However, they also emphasize the importance of incorporating diverse tree ages and expanded anatomical analyses to improve accuracy and capture broader subsidence dynamics.
{"title":"Mining activities at depth: A dendrogeomorphological perspective","authors":"Lucie Polášková, Radek Tichavský","doi":"10.1016/j.dendro.2025.126395","DOIUrl":"10.1016/j.dendro.2025.126395","url":null,"abstract":"<div><div>Mining subsidence poses a significant threat to the environment, with surface deformations often resulting in the loss of original settlements. The degree of surface damage varies between areas of long-term, continuous mining and peripheral zones where only a limited number of coal seams have been mined. This study involved a comprehensive analysis of 145 <em>Larix decidua</em> Mill. trees across two sites with differing degrees of undermining. This study evaluates dendrogeomorphological dating methods using reaction wood (RW) and abrupt growth suppression (AGS) to reconstruct mining-induced subsidence. The analysis successfully identified subsidence events, including those occurring at significant distances of up to 1.3 km from mining activities. Key differences were observed between the two sites: the continuously affected site exhibited prolonged subsidence events linked to extensive mining, while the peripheral site recorded discrete, sudden events. These findings highlight the potential of dendrogeomorphology for reconstructing subsidence activity with high temporal and spatial resolution, particularly during periods of intense mining activity. However, they also emphasize the importance of incorporating diverse tree ages and expanded anatomical analyses to improve accuracy and capture broader subsidence dynamics.</div></div>","PeriodicalId":50595,"journal":{"name":"Dendrochronologia","volume":"93 ","pages":"Article 126395"},"PeriodicalIF":2.3,"publicationDate":"2025-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144863183","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-07-18DOI: 10.1016/j.dendro.2025.126394
Eunice Romero , Edgar J. González , Miloš Rydval , Václav Treml
Blue Intensity (BI) has been widely used as a proxy for wood density in dendrochronology, yet its applications remain underexplored in treeline ecology. Moving beyond traditional growth ring analyses, we expanded the Blue Intensity scope by quantifying the high wood density proportions (HighWD), including two HighWD subcategories: latewood and compression wood, in the stems of Picea abies seedlings from Central European treelines. We used BIcounter, a novel tool based on the CooRecorder BI algorithm, to quantify pixel distributions across blue light intensities and estimate HighWD areas as proportions of the total cross-section. Our approach combined BIcounter with densitometry analysis in CooRecorder (both based on BI measurements), allowing us to study compression wood occurrence as a continuous variable, which enhances statistical models’ robustness. To estimate and compare means and variance of HighWD, latewood and compression wood proportions, and to quantify those estimates’ uncertainty, we constructed Bayesian generalized linear models. HighWD occupied nearly half of the cross-section of treeline seedlings (Mean = 0.39, S.D. = 0.04) and did not differ between treeline sites. Stem eccentricity was generally high and did not correlate with compression wood proportions. As compression wood accounted for up to 43 % of the treeline seedlings' stem cross-section, its occurrence could affect growth and survival, highlighting the importance of considering compression wood proportions in future ecological research. With this study, we outline the potential of BI for applications in and dendroecology, and suggest that future research could explore its use in other dendrochronological sub-disciplines, such as dendrogeomorphology.
{"title":"Expanding Blue Intensity applications: Exploring compression wood proportions in cross-sections of treeline Picea abies seedlings","authors":"Eunice Romero , Edgar J. González , Miloš Rydval , Václav Treml","doi":"10.1016/j.dendro.2025.126394","DOIUrl":"10.1016/j.dendro.2025.126394","url":null,"abstract":"<div><div>Blue Intensity (BI) has been widely used as a proxy for wood density in dendrochronology, yet its applications remain underexplored in treeline ecology. Moving beyond traditional growth ring analyses, we expanded the Blue Intensity scope by quantifying the high wood density proportions (HighWD), including two HighWD subcategories: latewood and compression wood, in the stems of <em>Picea abies</em> seedlings from Central European treelines. We used BIcounter, a novel tool based on the CooRecorder BI algorithm, to quantify pixel distributions across blue light intensities and estimate HighWD areas as proportions of the total cross-section. Our approach combined BIcounter with densitometry analysis in CooRecorder (both based on BI measurements), allowing us to study compression wood occurrence as a continuous variable, which enhances statistical models’ robustness. To estimate and compare means and variance of HighWD, latewood and compression wood proportions, and to quantify those estimates’ uncertainty, we constructed Bayesian generalized linear models. HighWD occupied nearly half of the cross-section of treeline seedlings (Mean = 0.39, S.D. = 0.04) and did not differ between treeline sites. Stem eccentricity was generally high and did not correlate with compression wood proportions. As compression wood accounted for up to 43 % of the treeline seedlings' stem cross-section, its occurrence could affect growth and survival, highlighting the importance of considering compression wood proportions in future ecological research. With this study, we outline the potential of BI for applications in and dendroecology, and suggest that future research could explore its use in other dendrochronological sub-disciplines, such as dendrogeomorphology.</div></div>","PeriodicalId":50595,"journal":{"name":"Dendrochronologia","volume":"93 ","pages":"Article 126394"},"PeriodicalIF":2.7,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144694959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号