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}
Pub Date : 2025-07-16DOI: 10.1016/j.dendro.2025.126393
Jiuqi Chen , Yonghui Wang , Tongwen Zhang , Kexiang Liu , Shulong Yu , Kailong Guo , Zhihao He , Beihua Liang
Vegetation growth is influenced not only by current climatic conditions but also by growth legacy signals and preceding climate variability. To investigate the impacts of vegetation growth carryover (VGC) and lagged climate effects (LCE) on vegetation at two distinct scales, tree-ring width (TRW) and enhanced vegetation index (EVI), we focused on Juniperus seravschanica, a dominant species in Tajikistan. Using both TRW and EVI datasets, we employed a vector autoregression (VAR) model to analyze the intensity and duration of vegetation responses to climate through VGC and LCE at different spatial and temporal scales. Our results revealed that both the VGC and LCE effects were stronger in TRW than in EVI. For both indicators, the peak intensity of LCE responses occurred within a lag of 0–3 years, suggesting that this time window is optimal for studying lagged climate effects on vegetation. Except in ZTW (EVI), the contribution of VGC to vegetation growth is much stronger than that of LCE. Moreover, VGC and LCE were found to be decoupled, indicating that their influences on vegetation growth are independent of each other. Ultimately, Juniperus seravschanica appears to adapt to harsh environmental conditions by modulating its growth through both VGC and LCE mechanisms. Investigating VGC and LCE using multi-scale vegetation indicators provides deeper insights into forest ecosystem functioning and offers a more comprehensive perspective for studying vegetation dynamics over time. These findings enhance our understanding of vegetation–climate interactions and offer valuable guidance for vegetation management in arid regions under the context of global climate change.
{"title":"Vegetation growth carryover and lagged climatic effect at Juniperus seravschanica different scales: From tree rings to remote sensing data","authors":"Jiuqi Chen , Yonghui Wang , Tongwen Zhang , Kexiang Liu , Shulong Yu , Kailong Guo , Zhihao He , Beihua Liang","doi":"10.1016/j.dendro.2025.126393","DOIUrl":"10.1016/j.dendro.2025.126393","url":null,"abstract":"<div><div>Vegetation growth is influenced not only by current climatic conditions but also by growth legacy signals and preceding climate variability. To investigate the impacts of vegetation growth carryover (VGC) and lagged climate effects (LCE) on vegetation at two distinct scales, tree-ring width (TRW) and enhanced vegetation index (EVI), we focused on <em>Juniperus seravschanica</em>, a dominant species in Tajikistan. Using both TRW and EVI datasets, we employed a vector autoregression (VAR) model to analyze the intensity and duration of vegetation responses to climate through VGC and LCE at different spatial and temporal scales. Our results revealed that both the VGC and LCE effects were stronger in TRW than in EVI. For both indicators, the peak intensity of LCE responses occurred within a lag of 0–3 years, suggesting that this time window is optimal for studying lagged climate effects on vegetation. Except in ZTW (EVI), the contribution of VGC to vegetation growth is much stronger than that of LCE. Moreover, VGC and LCE were found to be decoupled, indicating that their influences on vegetation growth are independent of each other. Ultimately, <em>Juniperus seravschanica</em> appears to adapt to harsh environmental conditions by modulating its growth through both VGC and LCE mechanisms. Investigating VGC and LCE using multi-scale vegetation indicators provides deeper insights into forest ecosystem functioning and offers a more comprehensive perspective for studying vegetation dynamics over time. These findings enhance our understanding of vegetation–climate interactions and offer valuable guidance for vegetation management in arid regions under the context of global climate change.</div></div>","PeriodicalId":50595,"journal":{"name":"Dendrochronologia","volume":"93 ","pages":"Article 126393"},"PeriodicalIF":2.7,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144694960","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 : 2025-07-16DOI: 10.1016/j.dendro.2025.126392
Nela Altmanová , Martina Hrádková , Eva Návratová , Vít Pejcha , Václav Bažant , Savannah Collins-Key , Jiří Doležal , Daniel Druckenbrod , Tsutomu Enoki , Keyan Fang , Pavel Fibich , Grant L. Harley , Kazuhiko Hoshizaki , Hideyuki Ida , Masae I. Ishihara , Akira Kagawa , Kirill A. Korznikov , Justin Maxwell , Masahiro Nakamura , Mahoko Noguchi , Jan Altman
Tree-growth patterns encode valuable information about forest dynamics, ecological processes, and environmental changes. However, extracting this information requires precise visualization of tree-ring boundaries. While species with distinct tree-ring boundaries (e.g., conifers and ring-porous hardwoods) have been extensively studied, diffuse-porous and semi-ring-porous species remain understudied, despite their ecological importance. Addressing this knowledge gap requires improved tree-ring visualization techniques for these challenging species to enable their reliable measurement and crossdating. In this study, we evaluated the effectiveness of various sample preparation and imaging techniques for enhancing tree-ring visibility in 62 temperate tree species sensu lato from East Asia and North America. We compared three preparation methods: increment cores surfaced with a core microtome with and without chalk, and double-stained thin sections. These were combined with four imaging techniques: visible light microscopy and fluorescence microscopy using ultraviolet (UV), green fluorescent protein A (GFPA), and red fluorescent protein 1 (RFP1) filters. The results demonstrated that double-stained thin sections under visible light yielded the clearest tree-ring boundaries, followed by chalked surfaced cores under visible light. Among the fluorescence techniques, UV fluorescence imaging outperformed GFPA and RFP1 fluorescence. Although double-stained thin-section preparation requires greater expertise, it is a reliable, relatively fast, and cost-effective approach that can expand the scope of dendrochronological studies and support broader applications in forest management, climate research, and biodiversity conservation.
{"title":"Enhancing tree-ring visibility: A comparative study of sample and imaging techniques for 62 temperate tree species","authors":"Nela Altmanová , Martina Hrádková , Eva Návratová , Vít Pejcha , Václav Bažant , Savannah Collins-Key , Jiří Doležal , Daniel Druckenbrod , Tsutomu Enoki , Keyan Fang , Pavel Fibich , Grant L. Harley , Kazuhiko Hoshizaki , Hideyuki Ida , Masae I. Ishihara , Akira Kagawa , Kirill A. Korznikov , Justin Maxwell , Masahiro Nakamura , Mahoko Noguchi , Jan Altman","doi":"10.1016/j.dendro.2025.126392","DOIUrl":"10.1016/j.dendro.2025.126392","url":null,"abstract":"<div><div>Tree-growth patterns encode valuable information about forest dynamics, ecological processes, and environmental changes. However, extracting this information requires precise visualization of tree-ring boundaries. While species with distinct tree-ring boundaries (e.g., conifers and ring-porous hardwoods) have been extensively studied, diffuse-porous and semi-ring-porous species remain understudied, despite their ecological importance. Addressing this knowledge gap requires improved tree-ring visualization techniques for these challenging species to enable their reliable measurement and crossdating. In this study, we evaluated the effectiveness of various sample preparation and imaging techniques for enhancing tree-ring visibility in 62 temperate tree species <em>sensu lato</em> from East Asia and North America. We compared three preparation methods: increment cores surfaced with a core microtome with and without chalk, and double-stained thin sections. These were combined with four imaging techniques: visible light microscopy and fluorescence microscopy using ultraviolet (UV), green fluorescent protein A (GFPA), and red fluorescent protein 1 (RFP1) filters. The results demonstrated that double-stained thin sections under visible light yielded the clearest tree-ring boundaries, followed by chalked surfaced cores under visible light. Among the fluorescence techniques, UV fluorescence imaging outperformed GFPA and RFP1 fluorescence. Although double-stained thin-section preparation requires greater expertise, it is a reliable, relatively fast, and cost-effective approach that can expand the scope of dendrochronological studies and support broader applications in forest management, climate research, and biodiversity conservation.</div></div>","PeriodicalId":50595,"journal":{"name":"Dendrochronologia","volume":"93 ","pages":"Article 126392"},"PeriodicalIF":2.7,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144695067","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 : 2025-07-09DOI: 10.1016/j.dendro.2025.126385
Darren Davies , Neil J. Loader , Danny McCarroll , Dan Miles , Christopher Bronk Ramsey
ISODATE is a complete dating package for stable oxygen isotope dendrochronology that offers a user-friendly workspace for processing, crossmatching and precisely dating stable isotope chronologies. ISODATE provides the first standardisation of approach for isotope laboratories and the heritage sector for dating and the reporting of dates. The software produces downloadable figures and CSV files containing series alignments and statistical results. The application is freely and publicly available online (isodate.swansea.ac.uk). A manual and guided example accompanies the software. It is hoped that community-led refinements and additional reference chronologies will be added to ISODATE as the technique develops and is adopted more widely.
{"title":"ISODATE – Software for stable isotope dendrochronology","authors":"Darren Davies , Neil J. Loader , Danny McCarroll , Dan Miles , Christopher Bronk Ramsey","doi":"10.1016/j.dendro.2025.126385","DOIUrl":"10.1016/j.dendro.2025.126385","url":null,"abstract":"<div><div>ISODATE is a complete dating package for stable oxygen isotope dendrochronology that offers a user-friendly workspace for processing, crossmatching and precisely dating stable isotope chronologies. ISODATE provides the first standardisation of approach for isotope laboratories and the heritage sector for dating and the reporting of dates. The software produces downloadable figures and CSV files containing series alignments and statistical results. The application is freely and publicly available online (isodate.swansea.ac.uk). A manual and guided example accompanies the software. It is hoped that community-led refinements and additional reference chronologies will be added to ISODATE as the technique develops and is adopted more widely.</div></div>","PeriodicalId":50595,"journal":{"name":"Dendrochronologia","volume":"93 ","pages":"Article 126385"},"PeriodicalIF":2.7,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144680083","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 : 2025-07-07DOI: 10.1016/j.dendro.2025.126384
Balázs Garamszegi , Michael Grabner , Elisabeth Wächter , Josef Gadermaier , Klaus Katzensteiner
Silver fir (Abies alba Mill.) is a key forest tree species in Central Europe growing commonly in mixtures with beech and spruce. In forest sciences, the species has received wide attention due to the complex forest decline phase peaking in the late 1970s and the early 1980s in Central Europe, highlighting the negative effects of air pollution of that time. In the era of accelerating climate change with its adverse effects becoming apparent, the species is gaining renewed interest, especially for its further admixing potential to more resilient forest stands. In our study, we investigate the low-frequency radial growth patterns and changes, as well as the interannual variations and the corresponding climatic signal manifested in the tree-ring width chronologies of seven monospecific stands of silver fir. The study sites represent a broad climatic and elevational gradient along the distribution of the species. We compared the identified changes to recent climatic trends with more frequent dry periods since the 1980s, with specific attention to the timescale of the preceding forest decline phenomena. Following decades of radial growth decrease, culminating in severe decline at some sites, a quick recovery and increasing growth marked a period after the early 1980s, regardless of tree age and most pronounced at lower-elevation sites. The period of growth depression and recovery was accompanied by weakened or altered interannual climatic signals. During the recent decades, mean growth has been decreasing again at lower-elevation sites coinciding with drier conditions and shows signs of similar tendencies at some of the humid sites. A recent strengthening of the hydroclimatic signal, however, was not uniform in its timing among the sites. The interpretation of the results can help to further assess the resilience of silver fir to environmental stress, at the crossroads of past legacies, current and predicted challenges.
银杉（Abies alba Mill.）是中欧重要的森林树种，通常与山毛榉和云杉混合生长。在森林科学中，由于复杂的森林衰退阶段在20世纪70年代末和80年代初在中欧达到顶峰，突出了当时空气污染的负面影响，该物种受到了广泛关注。在气候变化加速及其不利影响日益明显的时代，该物种正重新引起人们的兴趣，特别是因为它具有进一步混入更有弹性的林分的潜力。本文研究了7个银杉单株林分的树轮宽度年代学中所表现出的低频径向生长模式和变化、年际变化及其相应的气候信号。研究地点代表了沿物种分布的广泛的气候和海拔梯度。我们将已确定的变化与自20世纪80年代以来干旱期更为频繁的近期气候趋势进行了比较，并特别关注了之前森林衰退现象的时间尺度。经过几十年的径向生长下降，在一些地点达到严重下降的顶峰，在20世纪80年代初之后，无论树龄如何，树木的快速恢复和增长都标志着一段时间，在低海拔地区最为明显。生长萧条期和恢复期伴随着年际气候信号减弱或改变。在最近的几十年里，在低海拔地区，平均生长再次下降，与干旱条件相一致，在一些潮湿地区也显示出类似的趋势。然而，最近水文气候信号的加强在各地点的时间上并不一致。对结果的解释可以帮助进一步评估银杉对环境压力的恢复能力，在过去的遗产，当前和预测的挑战的十字路口。
{"title":"Site and environmental legacies shape the growth–climate response of silver fir along a climatic and elevational gradient in Austria","authors":"Balázs Garamszegi , Michael Grabner , Elisabeth Wächter , Josef Gadermaier , Klaus Katzensteiner","doi":"10.1016/j.dendro.2025.126384","DOIUrl":"10.1016/j.dendro.2025.126384","url":null,"abstract":"<div><div>Silver fir (<em>Abies alba</em> Mill.) is a key forest tree species in Central Europe growing commonly in mixtures with beech and spruce. In forest sciences, the species has received wide attention due to the complex forest decline phase peaking in the late 1970s and the early 1980s in Central Europe, highlighting the negative effects of air pollution of that time. In the era of accelerating climate change with its adverse effects becoming apparent, the species is gaining renewed interest, especially for its further admixing potential to more resilient forest stands. In our study, we investigate the low-frequency radial growth patterns and changes, as well as the interannual variations and the corresponding climatic signal manifested in the tree-ring width chronologies of seven monospecific stands of silver fir. The study sites represent a broad climatic and elevational gradient along the distribution of the species. We compared the identified changes to recent climatic trends with more frequent dry periods since the 1980s, with specific attention to the timescale of the preceding forest decline phenomena. Following decades of radial growth decrease, culminating in severe decline at some sites, a quick recovery and increasing growth marked a period after the early 1980s, regardless of tree age and most pronounced at lower-elevation sites. The period of growth depression and recovery was accompanied by weakened or altered interannual climatic signals. During the recent decades, mean growth has been decreasing again at lower-elevation sites coinciding with drier conditions and shows signs of similar tendencies at some of the humid sites. A recent strengthening of the hydroclimatic signal, however, was not uniform in its timing among the sites. The interpretation of the results can help to further assess the resilience of silver fir to environmental stress, at the crossroads of past legacies, current and predicted challenges.</div></div>","PeriodicalId":50595,"journal":{"name":"Dendrochronologia","volume":"93 ","pages":"Article 126384"},"PeriodicalIF":2.7,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144653361","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 : 2025-07-03DOI: 10.1016/j.dendro.2025.126383
Mengdan Jing , Changfeng Sun , Yu Liu , Huiming Song , Xuan Wu , Qiufang Cai , Meng Ren , Zhuoying Li , Yongyong Ma , Qiang Li
The Altai and Tianshan Mountains in Xinjiang, located in northwest China, are considered important natural boundaries in Asia. However, the scarcity of long-term meteorological data in these regions has hindered a comprehensive understanding of historical climate variations and their influences on ecology. This study constructed a new tree-ring width chronology of Larix sibirica in the Altai Mountains. Correlation analysis results showed that the average minimum temperature from June to July (Tmin67) was significantly positively correlated with the tree-ring width chronology and was the primary limiting factor for tree radial growth Based on these findings, the Tmin67 for the Altai Mountains from 1730 to 2018 was reconstructed and the warmest and coldest years occurred in 2012 and 1743, respectively. In the past decade, the Tmin67 in the Altai Mountains has risen by 0.86 °C compared to pre-industrial levels. The summer North Atlantic Oscillation (NAO) was found to have an inverse effect on temperature variations in the Altai Mountains. This is the first reconstruction of summer minimum temperatures in the Altai Mountains of central Asia based on a standardized tree-ring width chronology of L. sibirica. Additionally, the combined influences of geographical features and environmental factors contribute to substantial differences in temperature changes between the Altai and Tianshan Mountains. These not only enhance our understanding of past temperature fluctuations but also for projecting future temperature changes through climate modeling.
{"title":"Tree rings reveal spatial differences in temperature changes between the Altai and Tianshan Mountains over the past 289 years","authors":"Mengdan Jing , Changfeng Sun , Yu Liu , Huiming Song , Xuan Wu , Qiufang Cai , Meng Ren , Zhuoying Li , Yongyong Ma , Qiang Li","doi":"10.1016/j.dendro.2025.126383","DOIUrl":"10.1016/j.dendro.2025.126383","url":null,"abstract":"<div><div>The Altai and Tianshan Mountains in Xinjiang, located in northwest China, are considered important natural boundaries in Asia. However, the scarcity of long-term meteorological data in these regions has hindered a comprehensive understanding of historical climate variations and their influences on ecology. This study constructed a new tree-ring width chronology of <em>Larix sibirica</em> in the Altai Mountains. Correlation analysis results showed that the average minimum temperature from June to July (Tmin<sub>67</sub>) was significantly positively correlated with the tree-ring width chronology and was the primary limiting factor for tree radial growth Based on these findings, the Tmin<sub>67</sub> for the Altai Mountains from 1730 to 2018 was reconstructed and the warmest and coldest years occurred in 2012 and 1743, respectively. In the past decade, the Tmin<sub>67</sub> in the Altai Mountains has risen by 0.86 °C compared to pre-industrial levels. The summer North Atlantic Oscillation (NAO) was found to have an inverse effect on temperature variations in the Altai Mountains. This is the first reconstruction of summer minimum temperatures in the Altai Mountains of central Asia based on a standardized tree-ring width chronology of <em>L. sibirica</em>. Additionally, the combined influences of geographical features and environmental factors contribute to substantial differences in temperature changes between the Altai and Tianshan Mountains. These not only enhance our understanding of past temperature fluctuations but also for projecting future temperature changes through climate modeling.</div></div>","PeriodicalId":50595,"journal":{"name":"Dendrochronologia","volume":"93 ","pages":"Article 126383"},"PeriodicalIF":2.7,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144580018","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}
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