Pub Date : 2025-12-01Epub 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":"2025-12-01","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 : 2025-12-01Epub 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":"2025-12-01","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}
Wood was used as boards for codices throughout the Middle Ages. The boards provided excellent protection for the vulnerable pages of the codices and, together with the fastenings attached to them, prevented the parchment folios from deforming due to changes in relative humidity. Our research aimed to verify the dating of four codices from the collection of the Diocesan Library in Pelplin (Poland) and to assess their integrity. In doing so, we compared the dating results of the wood used for binding with information derived from such fields as materials science, book technology and paleography. We also analysed decoration, texts, and historical written sources. We examined four manuscripts written between the 12th and 14th centuries. Two codices, namely Petrus Lombardus, Commentaria in Epistolas Pauli PL-Pe 4(8) and Processionale cisterciense PL-Pe 156(204), were bound on beech boards. The other two – Homiliarium PL-Pe 1(2) and Biblia sacra PL-Pe 11(25) – were bound using oak boards. The dendrochronological research revealed that the binding of the manuscript Petrus Lombardus, Commentaria in Epistolas Pauli, written in the 13th century, preserved the original cover boards. The binding, however, had been refurbished at least twice. The last repair was most likely done in Pelplin at the end of the 15th century. As for the three other manuscripts (composite codices), we established the circumstances in which the codices were rebound: they were all rebound in Pelplin in the 14th century using new boards. This means that the Cistercian workshop in Pelplin began rebinding codices no later than the 14th century. In addition, our study shows the variety of wood used and indicate the geographical sources of wood supply.
整个中世纪，木材都被用作抄本的板。这些纸板为易损坏的书页提供了极好的保护，并与它们相连的紧固件一起，防止了羊皮纸开本因相对湿度的变化而变形。我们的研究旨在验证佩尔普林（波兰）教区图书馆收藏的四本抄本的日期，并评估其完整性。在此过程中，我们将用于装订的木材的定年结果与材料科学、图书技术和古文字等领域的信息进行了比较。我们还分析了装饰、文字和历史文字来源。我们检查了四份写于12世纪到14世纪之间的手稿。两个抄本，即Petrus Lombardus， Commentaria in Epistolas Pauli PL-Pe 4(8)和Processionale cisterciense PL-Pe 156(204)，被装订在山毛榉板上。另外两个——Homiliarium PL-Pe 1(2)和Biblia sacra PL-Pe 11（25）——用橡木板装订。树形年表研究显示，13世纪写的《彼得鲁斯·伦巴杜，保利书信集注释》手稿的装订保存了原始的封皮。然而，这本书的封面至少被翻新过两次。最后一次修缮很可能是15世纪末在佩尔普林完成的。至于其他三份手稿（复合抄本），我们确定了抄本被反弹的情况：它们都是14世纪在佩尔普林用新木板反弹的。这意味着佩尔普林的西多会作坊开始重新装订抄本的时间不晚于14世纪。此外，我们的研究显示了所用木材的种类，并指出了木材供应的地理来源。
{"title":"Cistercian heritage in Pelplin, Poland. Dendrochronological dating of the covers of medieval codices","authors":"Barbara Gmińska-Nowak , Juliusz Raczkowski , Ewa Chlebus , Karl-Uwe Heussner","doi":"10.1016/j.dendro.2025.126439","DOIUrl":"10.1016/j.dendro.2025.126439","url":null,"abstract":"<div><div>Wood was used as boards for codices throughout the Middle Ages. The boards provided excellent protection for the vulnerable pages of the codices and, together with the fastenings attached to them, prevented the parchment folios from deforming due to changes in relative humidity. Our research aimed to verify the dating of four codices from the collection of the Diocesan Library in Pelplin (Poland) and to assess their integrity. In doing so, we compared the dating results of the wood used for binding with information derived from such fields as materials science, book technology and paleography. We also analysed decoration, texts, and historical written sources. We examined four manuscripts written between the 12th and 14th centuries. Two codices, namely <em>Petrus Lombardus, Commentaria in Epistolas Pauli</em> PL-Pe 4(8) and <em>Processionale cisterciense</em> PL-Pe 156(204), were bound on beech boards. The other two – <em>Homiliarium</em> PL-Pe 1(2) and <em>Biblia sacra</em> PL-Pe 11(25) – were bound using oak boards. The dendrochronological research revealed that the binding of the manuscript <em>Petrus Lombardus, Commentaria in Epistolas Pauli</em>, written in the 13th century, preserved the original cover boards. The binding, however, had been refurbished at least twice. The last repair was most likely done in Pelplin at the end of the 15th century. As for the three other manuscripts (composite codices), we established the circumstances in which the codices were rebound: they were all rebound in Pelplin in the 14th century using new boards. This means that the Cistercian workshop in Pelplin began rebinding codices no later than the 14th century. In addition, our study shows the variety of wood used and indicate the geographical sources of wood supply.</div></div>","PeriodicalId":50595,"journal":{"name":"Dendrochronologia","volume":"94 ","pages":"Article 126439"},"PeriodicalIF":2.3,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145415956","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}
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.
{"title":"Shrub-ring reconstruction of precipitation in the southeast of Tengger Desert, northwest China and its relationship with dust storm events","authors":"Ai-Jun Ding , Sheng-Chun Xiao , Xiao-Mei Peng , Quan-Yan Tian","doi":"10.1016/j.dendro.2025.126426","DOIUrl":"10.1016/j.dendro.2025.126426","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":50595,"journal":{"name":"Dendrochronologia","volume":"94 ","pages":"Article 126426"},"PeriodicalIF":2.3,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145362139","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 : 2025-12-01Epub 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":"2025-12-01","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 : 2025-12-01Epub Date: 2025-09-05DOI: 10.1016/j.dendro.2025.126404
Serrana Ambite , María Eugenia Ferrero , Ariel Muñoz , Christine Lucas
Dendrochronological data in diverse regions is more available each year, yet subtropical humid climates remain under-represented. This study addresses the dendrochronological potential of native species Neltuma affinis and Neltuma nigra, in subtropical humid savannas of northwestern Uruguay. Three ring-width chronologies from three sites are presented, using 80 series and 41 trees. Annual growth between 1901 and 2008 was compared to climate variability including precipitation, maximum temperature, Standardized Precipitation-Evaporation Index (SPEI), Southern Annular Mode and the South American Drought Atlas (SADA). Chronologies displayed an Expressed Population Signal ranging from 0.82 to 0.93. Growth was positively correlated with precipitation for the two N. affinis chronologies located at 39–62 masl (r = 0.30***; r = 0.37***), and negatively correlated for the N. nigra chronology located at 7–27 masl (r = -0.30**). Similarly, both N. affinis chronologies had a positive correlation with SPEI (r = 0.29**; r = 0.41***) and a negative correlation with maximum temperature (r = -0.31***; r = -0.48***), while a negative correlation with SPEI (r = -0.21**) and a positive correlation with maximum temperature (r = 0.23**) was found for N. nigra. Species-specific soil preferences may influence these contrasting responses, where N. affinis populations thrive in drainable soils and N. nigra occurs exclusively in flood-prone halomorphic soils, highlighting the role of topography in growth response to climate. This study contributes new data to the growing South American dendrochronological network, enhancing our understanding of growth drivers in savanna woodlands in Uruguay and similar subtropical humid climates.
{"title":"Subtropical humid savannas of northwestern Uruguay: Annual growth and climate variability in native species of Neltuma Raf.","authors":"Serrana Ambite , María Eugenia Ferrero , Ariel Muñoz , Christine Lucas","doi":"10.1016/j.dendro.2025.126404","DOIUrl":"10.1016/j.dendro.2025.126404","url":null,"abstract":"<div><div>Dendrochronological data in diverse regions is more available each year, yet subtropical humid climates remain under-represented. This study addresses the dendrochronological potential of native species <em>Neltuma affinis</em> and <em>Neltuma nigra</em>, in subtropical humid savannas of northwestern Uruguay. Three ring-width chronologies from three sites are presented, using 80 series and 41 trees. Annual growth between 1901 and 2008 was compared to climate variability including precipitation, maximum temperature, Standardized Precipitation-Evaporation Index (SPEI), Southern Annular Mode and the South American Drought Atlas (SADA). Chronologies displayed an Expressed Population Signal ranging from 0.82 to 0.93. Growth was positively correlated with precipitation for the two <em>N. affinis</em> chronologies located at 39–62 masl (r = 0.30***; r = 0.37***), and negatively correlated for the <em>N. nigra</em> chronology located at 7–27 masl (r = -0.30**)<em>.</em> Similarly, both <em>N. affinis</em> chronologies had a positive correlation with SPEI (r = 0.29**; r = 0.41***) and a negative correlation with maximum temperature (r = -0.31***; r = -0.48***), while a negative correlation with SPEI (r = -0.21**) and a positive correlation with maximum temperature (r = 0.23**) was found for <em>N. nigra</em>. Species-specific soil preferences may influence these contrasting responses, where <em>N. affinis</em> populations thrive in drainable soils and <em>N. nigra</em> occurs exclusively in flood-prone halomorphic soils, highlighting the role of topography in growth response to climate. This study contributes new data to the growing South American dendrochronological network, enhancing our understanding of growth drivers in savanna woodlands in Uruguay and similar subtropical humid climates.</div></div>","PeriodicalId":50595,"journal":{"name":"Dendrochronologia","volume":"94 ","pages":"Article 126404"},"PeriodicalIF":2.3,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145096381","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}
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.
{"title":"Growth of Tamarix ramosissima Ledeb. is benefitting from the recent climate change at the southern Tarim basin, northwest China","authors":"Maierdang Keyimu , Yanying Qi , Jianhua Peng , Yesi Zhao , Fanjiang Zeng","doi":"10.1016/j.dendro.2025.126427","DOIUrl":"10.1016/j.dendro.2025.126427","url":null,"abstract":"<div><div><em>Tamarix ramosissima</em> is a widely distributed shrub species in hyper arid areas of northwest China. However, the response of <em>T. ramosissima</em> radial growth to the recent “warm and humid” climate at the southern Tarim basin remains unclear. Here we collected disc samples of <em>T. ramosissima</em> 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 <em>T. ramosissima</em> 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 <em>T. ramosissima</em> 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 <em>T. ramosissima</em> is benefiting from the current climatic conditions in this region, suggesting that its ecological shelterbelt functions might be improved.</div></div>","PeriodicalId":50595,"journal":{"name":"Dendrochronologia","volume":"94 ","pages":"Article 126427"},"PeriodicalIF":2.3,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145266177","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 : 2025-12-01Epub Date: 2025-10-27DOI: 10.1016/j.dendro.2025.126436
Maxim Yermokhin , Andrej Maczkowski , Matthias Bolliger , John Francuz , Adrian Anastasi , Krist Anastasi , Ariane Ballmer , Mirco Brunner , Ilirjan Gjipali , Martin Hinz , Marco Hostettler , Johannes Reich , Sönke Szidat , Amy Bogaard , Kostas Kotsakis , Willy Tinner , Albert Hafner
In recent years, archaeological studies of pile dwellings in the southwestern Balkans have yielded a substantial amount of wood suitable for dendroarchaeological research, offering new opportunities for precise dating of prehistoric settlements and a deeper understanding of their development. Several multi-centennial tree-ring chronologies have been established within the European Research Council (ERC) funded ‘Exploring the dynamics and causes of prehistoric land use change in the cradle of European farming’ (EXPLO) project, spanning from the Neolithic period to the Iron Age, c. 6000–600 BCE in absolute dates, using oak (Quercus sp.), juniper (Juniperus sp.), and pine (Pinus sp.) timber collected from various structural settlement remains.
Using wooden samples from the site of Lin 3, Lake Ohrid, Albania, we have developed new tree-ring chronologies covering the first half and the end of the 6th millennium BCE. Notably, a single juniper tree-ring series extends back to the mid-7th millennium BCE. This Lin 3 juniper chronology was cross-dated to a juniper chronology from the site of Ohridati-Penelopa, located on the north-east side of Lake Ohrid. Thus, the LIN3‐06‐Penelopa combined tree-ring chronology represents the earliest-known continuous tree-ring chronology in the Balkans, spanning 6429–5466 cal BCE (±3 years, 95.4 %) and covering 964 years. Together with other juniper, oak, and pine chronologies from nearby Neolithic waterlogged sites, nearly the entire 6th millennium BCE is now covered. The outer rings of the earliest oak piles with waney edge from Lin 3 date back to 5862–5748 cal BCE (95.4 %), revealing the site as the earliest known Neolithic pile-dwelling of Europe.
Radiocarbon (14C) dating of the LIN3‐06‐Penelopa chronology indicates a potential overlap of 20–30 years with the absolutely dated juniper chronology from Dispilio, Greece. However, the short intersection does not yet allow for their dendrochronological cross-dating.
This article presents these newly constructed chronologies and explores the potential for developing an absolutely dated, multi-millennial tree-ring chronology of the Neolithic period in the southwestern Balkans through a combination of dendrochronology and radiocarbon dating.
{"title":"First multispecies tree-ring chronologies from the 6th millennium BCE in Southeastern Europe","authors":"Maxim Yermokhin , Andrej Maczkowski , Matthias Bolliger , John Francuz , Adrian Anastasi , Krist Anastasi , Ariane Ballmer , Mirco Brunner , Ilirjan Gjipali , Martin Hinz , Marco Hostettler , Johannes Reich , Sönke Szidat , Amy Bogaard , Kostas Kotsakis , Willy Tinner , Albert Hafner","doi":"10.1016/j.dendro.2025.126436","DOIUrl":"10.1016/j.dendro.2025.126436","url":null,"abstract":"<div><div>In recent years, archaeological studies of pile dwellings in the southwestern Balkans have yielded a substantial amount of wood suitable for dendroarchaeological research, offering new opportunities for precise dating of prehistoric settlements and a deeper understanding of their development. Several multi-centennial tree-ring chronologies have been established within the European Research Council (ERC) funded ‘Exploring the dynamics and causes of prehistoric land use change in the cradle of European farming’ (EXPLO) project, spanning from the Neolithic period to the Iron Age, c. 6000–600 BCE in absolute dates, using oak (<em>Quercus</em> sp.), juniper (<em>Juniperus</em> sp.), and pine (<em>Pinus</em> sp.) timber collected from various structural settlement remains.</div><div>Using wooden samples from the site of Lin 3, Lake Ohrid, Albania, we have developed new tree-ring chronologies covering the first half and the end of the 6th millennium BCE. Notably, a single juniper tree-ring series extends back to the mid-7th millennium BCE. This Lin 3 juniper chronology was cross-dated to a juniper chronology from the site of Ohridati-Penelopa, located on the north-east side of Lake Ohrid. Thus, the LIN3‐06‐Penelopa combined tree-ring chronology represents the earliest-known continuous tree-ring chronology in the Balkans, spanning 6429–5466 cal BCE (±3 years, 95.4 %) and covering 964 years. Together with other juniper, oak, and pine chronologies from nearby Neolithic waterlogged sites, nearly the entire 6th millennium BCE is now covered. The outer rings of the earliest oak piles with waney edge from Lin 3 date back to 5862–5748 cal BCE (95.4 %), revealing the site as the earliest known Neolithic pile-dwelling of Europe.</div><div>Radiocarbon (<sup>14</sup>C) dating of the LIN3‐06‐Penelopa chronology indicates a potential overlap of 20–30 years with the absolutely dated juniper chronology from Dispilio, Greece. However, the short intersection does not yet allow for their dendrochronological cross-dating.</div><div>This article presents these newly constructed chronologies and explores the potential for developing an absolutely dated, multi-millennial tree-ring chronology of the Neolithic period in the southwestern Balkans through a combination of dendrochronology and radiocarbon dating.</div></div>","PeriodicalId":50595,"journal":{"name":"Dendrochronologia","volume":"94 ","pages":"Article 126436"},"PeriodicalIF":2.3,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145415965","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 : 2025-12-01Epub Date: 2025-10-11DOI: 10.1016/j.dendro.2025.126430
Qingyu Zhao , Chenxi Xu , Wenling An , Yucheng Liu , Zhengtang Guo
In the Asian monsoon region, the oxygen isotope ratios in precipitation (δ18Oppt) are widely reported to be influenced by upstream convective activity, but short-term measurements have limited their further application. Tree-ring cellulose δ18O (δ18Ocell) is mainly influenced by δ18Oppt and local relative humidity, and it has great potential for extending the application of δ18Oppt. We present the intra-annual and annual variabilities of δ18Ocell of Pinus taiwanensis Hayata in the lower Yangtze River basin, China. Intra-annual δ18Ocell values show typical “V”-shaped patterns with the most depleted values occurring in the centre of each growth ring, similar to the variation of δ18Oppt. Using statistical analysis and forward modeling on different timescales, we found that the seasonal tree-ring isotopic cycle was primarily controlled by δ18Oppt, which depends on the large-scale atmospheric circulation. Additionally, seasonal δ18Ocell profiles were significantly linked with upstream processes, such as the tropical monsoon and outgoing longwave radiation (OLR) in the late or post monsoon season, across the upstream area. Local moisture conditions have a limited effect on intra-annual δ18Ocell. On the annual scale, δ18Ocell variability was controlled by both local moisture conditions and δ18Oppt during the growing season; however, these relationships were unstable during the past 40 years. Due to the diverse primary drivers of δ18Ocell on different timescales, annual and seasonal δ18Ocell records of multi-centennial length may enable us to infer long-term variations in different climate signals separately, such as the strength of upstream convective activity, especially in the late or post monsoon season, on the seasonal scale.
{"title":"Large-scale atmospheric circulation controls intra-annual tree-ring oxygen isotope in the lower Yangtze River basin","authors":"Qingyu Zhao , Chenxi Xu , Wenling An , Yucheng Liu , Zhengtang Guo","doi":"10.1016/j.dendro.2025.126430","DOIUrl":"10.1016/j.dendro.2025.126430","url":null,"abstract":"<div><div>In the Asian monsoon region, the oxygen isotope ratios in precipitation (δ<sup>18</sup>O<sub>ppt</sub>) are widely reported to be influenced by upstream convective activity, but short-term measurements have limited their further application. Tree-ring cellulose δ<sup>18</sup>O (δ<sup>18</sup>O<sub>cell</sub>) is mainly influenced by δ<sup>18</sup>O<sub>ppt</sub> and local relative humidity, and it has great potential for extending the application of δ<sup>18</sup>O<sub>ppt</sub>. We present the intra-annual and annual variabilities of δ<sup>18</sup>O<sub>cell</sub> of <em>Pinus taiwanensis</em> Hayata in the lower Yangtze River basin, China. Intra-annual δ<sup>18</sup>O<sub>cell</sub> values show typical “V”-shaped patterns with the most depleted values occurring in the centre of each growth ring, similar to the variation of δ<sup>18</sup>O<sub>ppt</sub>. Using statistical analysis and forward modeling on different timescales, we found that the seasonal tree-ring isotopic cycle was primarily controlled by δ<sup>18</sup>O<sub>ppt</sub>, which depends on the large-scale atmospheric circulation. Additionally, seasonal δ<sup>18</sup>O<sub>cell</sub> profiles were significantly linked with upstream processes, such as the tropical monsoon and outgoing longwave radiation (OLR) in the late or post monsoon season, across the upstream area. Local moisture conditions have a limited effect on intra-annual δ<sup>18</sup>O<sub>cell</sub>. On the annual scale, δ<sup>18</sup>O<sub>cell</sub> variability was controlled by both local moisture conditions and δ<sup>18</sup>O<sub>ppt</sub> during the growing season; however, these relationships were unstable during the past 40 years. Due to the diverse primary drivers of δ<sup>18</sup>O<sub>cell</sub> on different timescales, annual and seasonal δ<sup>18</sup>O<sub>cell</sub> records of multi-centennial length may enable us to infer long-term variations in different climate signals separately, such as the strength of upstream convective activity, especially in the late or post monsoon season, on the seasonal scale.</div></div>","PeriodicalId":50595,"journal":{"name":"Dendrochronologia","volume":"94 ","pages":"Article 126430"},"PeriodicalIF":2.3,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145324342","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}
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.
{"title":"Climate driven divergence of growth resilience of Picea crassifolia from semi-arid to semi-humid habitats","authors":"Zhengdong Guo , Liang Jiao , Ruhong Xue , Yarong Qin , Kuan Zhang , Peng Zhang , Xuge Wang , Xin Yuan , Weiyin Shi","doi":"10.1016/j.dendro.2025.126428","DOIUrl":"10.1016/j.dendro.2025.126428","url":null,"abstract":"<div><div>Analyzing the growth differences of <em>Picea crassifolia</em> 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 <em>P. crassifolia</em> 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) <em>P. crassifolia</em> 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 <em>P. crassifolia</em> trade-off strategies in dry habitats (<em>p</em> < 0.05), but exerted minimal effects in humid habitats. Our research demonstrates that hydrothermal combinations drive growth divergence of <em>P. crassifolia</em> 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.</div></div>","PeriodicalId":50595,"journal":{"name":"Dendrochronologia","volume":"94 ","pages":"Article 126428"},"PeriodicalIF":2.3,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145324341","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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