Pub Date : 2025-10-01DOI: 10.1016/j.dendro.2025.126424
Yameng Liu , Jinkuan Li , Jianfeng Peng , Jiaxin Li , Xiaoxu Wei , Keyu Zhang
Global warming has increased the frequency and intensity of droughts, thereby increasing the risk of forest decline and mortality. Although the negative impacts of drought on tree growth have been extensively studied, the mechanisms underlying tree growth resilience to cumulative drought effects and legacy responses remain poorly understood. Using tree-ring width and basal area increment analyses in the Dabie Mountains ecotone, a critical climate transition zone in China, we reveal that: (1) High-temperature-induced drought stress during mid-growing season (June-July) result in the primary constraint on radial growth because of the strong positive correlation between radial growth and the Standardized Precipitation Evapotranspiration Index, highlighting the vulnerability to drought of trees in this transition-zone; (2) A fundamental trade-off between resistance and recovery shapes drought resilience: increasing drought frequency reduces resistance but enhances recovery, while drought intensity effects are context-dependent, collectively driving nonlinear responses; (3) Drought legacy effects induce persistent radial growth decline through reduced biomass accumulation. These findings provide critical ecophysiological insights for modeling forest resilience in transitional ecosystems under climate change scenarios.
{"title":"Cumulative droughts and legacy effects decreased long-term growth resilience in Pinus massoniana in the middle Dabie Mountains","authors":"Yameng Liu , Jinkuan Li , Jianfeng Peng , Jiaxin Li , Xiaoxu Wei , Keyu Zhang","doi":"10.1016/j.dendro.2025.126424","DOIUrl":"10.1016/j.dendro.2025.126424","url":null,"abstract":"<div><div>Global warming has increased the frequency and intensity of droughts, thereby increasing the risk of forest decline and mortality. Although the negative impacts of drought on tree growth have been extensively studied, the mechanisms underlying tree growth resilience to cumulative drought effects and legacy responses remain poorly understood. Using tree-ring width and basal area increment analyses in the Dabie Mountains ecotone, a critical climate transition zone in China, we reveal that: (1) High-temperature-induced drought stress during mid-growing season (June-July) result in the primary constraint on radial growth because of the strong positive correlation between radial growth and the Standardized Precipitation Evapotranspiration Index, highlighting the vulnerability to drought of trees in this transition-zone; (2) A fundamental trade-off between resistance and recovery shapes drought resilience: increasing drought frequency reduces resistance but enhances recovery, while drought intensity effects are context-dependent, collectively driving nonlinear responses; (3) Drought legacy effects induce persistent radial growth decline through reduced biomass accumulation. These findings provide critical ecophysiological insights for modeling forest resilience in transitional ecosystems under climate change scenarios.</div></div>","PeriodicalId":50595,"journal":{"name":"Dendrochronologia","volume":"94 ","pages":"Article 126424"},"PeriodicalIF":2.3,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220746","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 : 2025-09-29DOI: 10.1016/j.dendro.2025.126421
Maxim Yermokhin , Māris Zunde
Since the early medieval period wide and slow-moving Dzvina River (known as Zapadnaya Dvina in Russia and Daugava in Latvia) and its forested tributaries were key route to transporting timber from the upper Dzvina and Dnieper basins to Riga, and further to Western Europe. As a result, timber also from the territory of present-day Belarus appears in many European timber collections as “Baltic oak” and “Riga pines”. To trace this historic trade route and to further dating of undated wooden structures, we developed a new 831-year Scots pine (Pinus sylvestris L.) tree-ring chronology (BY03b) using samples from living trees, historic, and archaeological timber from northern Belarus. These include samples from Polatsk and Vitsebsk archaeological excavations, historical buildings in Polatsk, and samples from Riga’s Dannenstern House which was built from the timber imported from the middle part of Dzvina basin. The BY03b chronology aligns well with modern tree-ring datasets from eastern Latvia, Lithuania, Estonia, and western Belarus, though these links weaken near the coast of the Baltic Sea. Our evidence suggests the pine timber trade between the upper and lower Dzvina / Daugava basin began in the 14th century and peaked in the 16th–17th centuries. As a result, many historical sites in Riga consist of timber from Belarus. In addition, timber from northern Belarus was used to build Danson House and Lytham Hall in the United Kingdom in the 18th century, located 2000 kilometers from the region of timber origins, confirming the very long-distance export of Belarusian timber throughout Europe. Thus, this new Belarusian multi-century pine chronology provides an exclusive basis for tracing precisely in time the trade connections of pine timber exported from the Dzvina / Daugava (and possibly Dnieper) basin to Western Europe via Riga in 14th – 19th centuries.
{"title":"An 831-year pine tree-ring chronology from Northern Belarus reveals historical timber trade routes to the Baltic and beyond","authors":"Maxim Yermokhin , Māris Zunde","doi":"10.1016/j.dendro.2025.126421","DOIUrl":"10.1016/j.dendro.2025.126421","url":null,"abstract":"<div><div>Since the early medieval period wide and slow-moving Dzvina River (known as Zapadnaya Dvina in Russia and Daugava in Latvia) and its forested tributaries were key route to transporting timber from the upper Dzvina and Dnieper basins to Riga, and further to Western Europe. As a result, timber also from the territory of present-day Belarus appears in many European timber collections as “Baltic oak” and “Riga pines”. To trace this historic trade route and to further dating of undated wooden structures, we developed a new 831-year Scots pine (<em>Pinus sylvestris</em> L.) tree-ring chronology (BY03b) using samples from living trees, historic, and archaeological timber from northern Belarus. These include samples from Polatsk and Vitsebsk archaeological excavations, historical buildings in Polatsk, and samples from Riga’s Dannenstern House which was built from the timber imported from the middle part of Dzvina basin. The BY03b chronology aligns well with modern tree-ring datasets from eastern Latvia, Lithuania, Estonia, and western Belarus, though these links weaken near the coast of the Baltic Sea. Our evidence suggests the pine timber trade between the upper and lower Dzvina / Daugava basin began in the 14th century and peaked in the 16th–17th centuries. As a result, many historical sites in Riga consist of timber from Belarus. In addition, timber from northern Belarus was used to build Danson House and Lytham Hall in the United Kingdom in the 18th century, located 2000 kilometers from the region of timber origins, confirming the very long-distance export of Belarusian timber throughout Europe. Thus, this new Belarusian multi-century pine chronology provides an exclusive basis for tracing precisely in time the trade connections of pine timber exported from the Dzvina / Daugava (and possibly Dnieper) basin to Western Europe via Riga in 14th – 19th centuries.</div></div>","PeriodicalId":50595,"journal":{"name":"Dendrochronologia","volume":"94 ","pages":"Article 126421"},"PeriodicalIF":2.3,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220747","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 temperate forests of southern Chile are unique and complex ecosystems, threatened by climate change and anthropogenic activities. One of the long-lived and endemic species of these forests is the Guaitecas Cypress (Pilgerodendron uviferum), the southernmost conifer in the world, with a latitudinal distribution between 39 and 55°S, from temperate rainy to Subantarctic climates, being an ideal model for studying the response of tree species to climate in high latitudes. The objective of this study is to determine the growth patterns of P. uviferum forests in Chilean regions of Aysén (∼47–48°S) and Magallanes (∼53°S) using ring-width chronologies of four and six forests in Aysén and Magallanes, respectively. A Principal Component Analysis identified two dominant patterns: PC1 associated with Magallanes chronologies, and PC2 with Aysén chronologies. Using ERA5-Land data (1979–2020), both components showed positive correlations with precipitation and negative correlations with temperature. PC1 was positively related to soil water content, while PC2 negatively. Contrasting responses were found with large-scale forcings, where PC1 was negatively correlated with AAO and PDO, and positively correlated with SOI, while PC2 showed the opposite pattern. Spectral analyses reinforce these results, showing regional differences in the growth patterns of P. uviferum. This opposite relationship suggests that regional growth patterns of P. uviferum are influenced by large-scale modes of climate variability affecting southern South American climates. These results highlight the potential of P. uviferum chronologies to represent the large-scale climate variability of southern South America and to recover the low-frequency signal in climate reconstructions from this species.
{"title":"Growth patterns and responses to climate variability of Subantarctic Pilgerodendron uviferum forests in the Aysén (∼47–48°S) and Magallanes (∼53°S) regions, southern Patagonia","authors":"Isabella Aguilera-Betti , Juan-Carlos Aravena , Ricardo Villalba , Catalina Fernández-García , Christian Bringas , Álvaro González-Reyes","doi":"10.1016/j.dendro.2025.126422","DOIUrl":"10.1016/j.dendro.2025.126422","url":null,"abstract":"<div><div>The temperate forests of southern Chile are unique and complex ecosystems, threatened by climate change and anthropogenic activities. One of the long-lived and endemic species of these forests is the Guaitecas Cypress (<em>Pilgerodendron uviferum</em>), the southernmost conifer in the world, with a latitudinal distribution between 39 and 55°S, from temperate rainy to Subantarctic climates, being an ideal model for studying the response of tree species to climate in high latitudes. The objective of this study is to determine the growth patterns of <em>P. uviferum</em> forests in Chilean regions of Aysén (∼47–48°S) and Magallanes (∼53°S) using ring-width chronologies of four and six forests in Aysén and Magallanes, respectively. A Principal Component Analysis identified two dominant patterns: PC1 associated with Magallanes chronologies, and PC2 with Aysén chronologies. Using ERA5-Land data (1979–2020), both components showed positive correlations with precipitation and negative correlations with temperature. PC1 was positively related to soil water content, while PC2 negatively. Contrasting responses were found with large-scale forcings, where PC1 was negatively correlated with AAO and PDO, and positively correlated with SOI, while PC2 showed the opposite pattern. Spectral analyses reinforce these results, showing regional differences in the growth patterns of <em>P. uviferum</em>. This opposite relationship suggests that regional growth patterns of <em>P. uviferum</em> are influenced by large-scale modes of climate variability affecting southern South American climates. These results highlight the potential of <em>P. uviferum</em> chronologies to represent the large-scale climate variability of southern South America and to recover the low-frequency signal in climate reconstructions from this species.</div></div>","PeriodicalId":50595,"journal":{"name":"Dendrochronologia","volume":"94 ","pages":"Article 126422"},"PeriodicalIF":2.3,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145220759","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 : 2025-09-20DOI: 10.1016/j.dendro.2025.126420
Yonghong Zheng , Rob Wilson , Mingjun Wang , Emily Reid
Tree-ring blue intensity (BI), a substitute for tree-ring density, has gained increasing attention in recent years as a robust tree-ring proxy for climate reconstruction. However, it still presents considerable uncertainty due to its status as a relatively new tree-ring parameter with limitations related to sample discolouration issues and image resolution. This study aims to identify the climate information embedded in different tree-ring parameters measured from white spruce samples and examine whether the relationship between tree-ring parameters and climate is impacted by altitude, image resolution, and BI data collection method. By measuring ring width (RW), earlywood blue intensity (EWBI), latewood blue intensity (LWBI), and delta blue intensity (DBI) at higher (1065 m a.s.l.) and lower (965 m a.s.l.) sites in southern Yukon, we found that LWBI and DBI show a significantly stronger climate signal over RW, especially at high frequencies, aligning with previous climate studies. The upper site performed better than the lower site, agreeing with the expectation that the climate response will increase for sites closer to tree-line. While higher-resolution methods like the Advanced Tree-Ring Image Capturing System (ATRICS) did not outperform the scanner method, further testing is needed. Additionally, both the mean of sorted pixels (Pix) method and the mean of slices (Slc) method have their strength in DBI chronologies, but further testing is recommended to optimize data selection methods.
近年来，树木年轮蓝强度（BI）作为替代树木年轮密度的一种可靠的气候重建指标受到越来越多的关注。然而，由于其作为一个相对较新的树轮参数的地位，它仍然存在相当大的不确定性，并且与样品变色问题和图像分辨率有关。本研究旨在识别从白云杉样本中测量的不同树木年轮参数中嵌入的气候信息，并研究树木年轮参数与气候之间的关系是否受到海拔、图像分辨率和BI数据收集方法的影响。通过对育空南部较高（1065 m a.s.l.）和较低（965 m a.s.l.）的环宽（RW）、早木蓝强度（EWBI）、晚木蓝强度（LWBI）和三角洲蓝强度（DBI）的测量，我们发现LWBI和DBI在育空南部表现出明显更强的气候信号，特别是在高频处，这与以往的气候研究结果一致。海拔较高的地点比海拔较低的地点表现得更好，这与接近树线的地点气候响应会增加的预期相一致。虽然像高级树轮图像捕获系统（ATRICS）这样的高分辨率方法的性能并不优于扫描仪方法，但还需要进一步的测试。此外，排序像素平均值（Pix）方法和切片平均值（Slc）方法在DBI年表中都有其优势，但建议进一步测试以优化数据选择方法。
{"title":"Tree-ring blue intensity and climate sensitivity: Exploring site and method-specific variations in southern Yukon, Canada","authors":"Yonghong Zheng , Rob Wilson , Mingjun Wang , Emily Reid","doi":"10.1016/j.dendro.2025.126420","DOIUrl":"10.1016/j.dendro.2025.126420","url":null,"abstract":"<div><div>Tree-ring blue intensity (BI), a substitute for tree-ring density, has gained increasing attention in recent years as a robust tree-ring proxy for climate reconstruction. However, it still presents considerable uncertainty due to its status as a relatively new tree-ring parameter with limitations related to sample discolouration issues and image resolution. This study aims to identify the climate information embedded in different tree-ring parameters measured from white spruce samples and examine whether the relationship between tree-ring parameters and climate is impacted by altitude, image resolution, and BI data collection method. By measuring ring width (RW), earlywood blue intensity (EWBI), latewood blue intensity (LWBI), and delta blue intensity (DBI) at higher (1065 m a.s.l.) and lower (965 m a.s.l.) sites in southern Yukon, we found that LWBI and DBI show a significantly stronger climate signal over RW, especially at high frequencies, aligning with previous climate studies. The upper site performed better than the lower site, agreeing with the expectation that the climate response will increase for sites closer to tree-line. While higher-resolution methods like the Advanced Tree-Ring Image Capturing System (ATRICS) did not outperform the scanner method, further testing is needed. Additionally, both the mean of sorted pixels (Pix) method and the mean of slices (Slc) method have their strength in DBI chronologies, but further testing is recommended to optimize data selection methods.</div></div>","PeriodicalId":50595,"journal":{"name":"Dendrochronologia","volume":"94 ","pages":"Article 126420"},"PeriodicalIF":2.3,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145118429","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 : 2025-09-06DOI: 10.1016/j.dendro.2025.126418
Nipeng Qian , Gangdun Li , Linxu Wang , Chunchao Dong , Kuan Shi , Asghar Ali , Guang Zhou , Qijing Liu
Understanding the interplay between wood formation and non-structural carbohydrate (NSC) dynamics is essential to identifying the drivers of tree growth under changing climates. In this study, we investigated intra-annual wood formation in the stems of Larix olgensis across a 700 m elevational gradient on Changbai Mountain, Northeast China, during the 2023 growing season. Weekly microcoring was performed on 35 trees at seven elevations to assess cambial phenology and wood formation, while NSC (soluble sugar and starch) concentrations were measured in needles, branches, coarse roots, phloem (stem), xylem from 20 trees at four elevations over seven sampling dates. We found that the onset of cell enlargement, wall-thickening, and lignification was significantly delayed with increasing elevation, and closely predicted by temperature and GDD. In contrast, growth cessation showed no consistent variation across elevations and unrelated to temperature, but was better explained by CDD. Despite a shortened growing season at higher elevations, NSC concentrations in most organs exhibited similar seasonal patterns across sites. NSC levels in needles, branches, and roots reached their lowest during peak cell enlargement in mid-June, indicating high sink demand, while xylem NSC peaked early and declined steadily thereafter. Our results demonstrate the critical role of thresholds in regulating the onset and cessation of wood formation. The temporal alignment between NSC dynamics and cambial activity suggests a functional coupling between carbon availability and sink demand. These findings advance our understanding of the environmental control of growth phenology and carbon use in boreal conifers across elevational gradients.
{"title":"Linking wood formation and non-structural carbohydrate dynamics in Larix olgensis along an elevational gradient","authors":"Nipeng Qian , Gangdun Li , Linxu Wang , Chunchao Dong , Kuan Shi , Asghar Ali , Guang Zhou , Qijing Liu","doi":"10.1016/j.dendro.2025.126418","DOIUrl":"10.1016/j.dendro.2025.126418","url":null,"abstract":"<div><div>Understanding the interplay between wood formation and non-structural carbohydrate (NSC) dynamics is essential to identifying the drivers of tree growth under changing climates. In this study, we investigated intra-annual wood formation in the stems of <em>Larix olgensis</em> across a 700 m elevational gradient on Changbai Mountain, Northeast China, during the 2023 growing season. Weekly microcoring was performed on 35 trees at seven elevations to assess cambial phenology and wood formation, while NSC (soluble sugar and starch) concentrations were measured in needles, branches, coarse roots, phloem (stem), xylem from 20 trees at four elevations over seven sampling dates. We found that the onset of cell enlargement, wall-thickening, and lignification was significantly delayed with increasing elevation, and closely predicted by temperature and GDD. In contrast, growth cessation showed no consistent variation across elevations and unrelated to temperature, but was better explained by CDD. Despite a shortened growing season at higher elevations, NSC concentrations in most organs exhibited similar seasonal patterns across sites. NSC levels in needles, branches, and roots reached their lowest during peak cell enlargement in mid-June, indicating high sink demand, while xylem NSC peaked early and declined steadily thereafter. Our results demonstrate the critical role of thresholds in regulating the onset and cessation of wood formation. The temporal alignment between NSC dynamics and cambial activity suggests a functional coupling between carbon availability and sink demand. These findings advance our understanding of the environmental control of growth phenology and carbon use in boreal conifers across elevational gradients.</div></div>","PeriodicalId":50595,"journal":{"name":"Dendrochronologia","volume":"94 ","pages":"Article 126418"},"PeriodicalIF":2.3,"publicationDate":"2025-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145020457","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}
Non-invasive methods are increasingly used in dendrochronological studies of historical wooden objects, though typically limited to small- and medium-sized items. This study investigated the feasibility of applying computed tomography (CT) to a human-sized wooden artefact. An industrial X-ray 3D CT scanner was used to scan a polychrome statue of Saint Louis (1214–1270), made from Scots pine (Pinus sylvestris), measuring 170 × 75 × 35 cm. Due to the object's large size, a resolution of 128 µm was achieved, allowing detection of annual rings as narrow as 0.5 mm and reconstruction of a 111-year ring-width sequence. To extend the chronology, the outermost rings were documented through digital microphotography on an exposed semi-radial surface on the back side of the sculpture—an area inaccessible to CT due to physical constraints. This supplemental analysis provided an additional 117 years, resulting in a combined 228-year series dated to 1501–1728. The sequence shows strong correlation with the Riga Dannenstern House chronology, supporting a timber origin in northeastern Lithuania, southern Latvia, or northern Belarus. The presence of 87 sapwood rings suggests a most probably felling date between 1728 and 1736. The dendrochronological dating challenges earlier hypothesis that attributed the sculpture to the first half of the 17th century or even the 16th century. Moreover, the study demonstrates the effectiveness and practicality of applying industrial X-ray CT to large-scale wooden sculptures, particularly when supplemented by direct ring-width measurements from exposed surfaces.
{"title":"Non-destructive dendrochronology of a human-sized wooden sculpture of Saint Louis using X-ray computed tomography and micro-imaging","authors":"Rūtilė Pukienė , Elena Jasiūnienė , Akmis Lomsargis , Rapolas Vedrickas","doi":"10.1016/j.dendro.2025.126419","DOIUrl":"10.1016/j.dendro.2025.126419","url":null,"abstract":"<div><div>Non-invasive methods are increasingly used in dendrochronological studies of historical wooden objects, though typically limited to small- and medium-sized items. This study investigated the feasibility of applying computed tomography (CT) to a human-sized wooden artefact. An industrial X-ray 3D CT scanner was used to scan a polychrome statue of Saint Louis (1214–1270), made from Scots pine (Pinus sylvestris), measuring 170 × 75 × 35 cm. Due to the object's large size, a resolution of 128 µm was achieved, allowing detection of annual rings as narrow as 0.5 mm and reconstruction of a 111-year ring-width sequence. To extend the chronology, the outermost rings were documented through digital microphotography on an exposed semi-radial surface on the back side of the sculpture—an area inaccessible to CT due to physical constraints. This supplemental analysis provided an additional 117 years, resulting in a combined 228-year series dated to 1501–1728. The sequence shows strong correlation with the Riga Dannenstern House chronology, supporting a timber origin in northeastern Lithuania, southern Latvia, or northern Belarus. The presence of 87 sapwood rings suggests a most probably felling date between 1728 and 1736. The dendrochronological dating challenges earlier hypothesis that attributed the sculpture to the first half of the 17th century or even the 16th century. Moreover, the study demonstrates the effectiveness and practicality of applying industrial X-ray CT to large-scale wooden sculptures, particularly when supplemented by direct ring-width measurements from exposed surfaces.</div></div>","PeriodicalId":50595,"journal":{"name":"Dendrochronologia","volume":"94 ","pages":"Article 126419"},"PeriodicalIF":2.3,"publicationDate":"2025-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145049319","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 : 2025-09-05DOI: 10.1016/j.dendro.2025.126405
Tian Chen , Yu Xia , Peiyao Tao , Jingyun Ma , Xiaohua Gou , Miaomiao Du , Fen Zhang
Investigating the growth synchrony of a tree species across spatiotemporal scales could enhances the understanding of species' climatic responses, which is particularly critical for addressing future ecological risks under climate change. However, studies on the growth synchrony of Picea crassifolia across elevation remain largely unclear in the Qilian Mountains. The tree cores of 592 P. crassifolia were collected from nine forest sites in the eastern Qilian Mountains to investigate the tree growth synchrony and its climatic drivers. The growth synchrony of P. crassifolia was the highest at 3100–3200 m during 1975–2005 but showed a significant decline with time. Although it was lower, the growth synchrony of P. crassifolia remained stable at 2712–2800 m and 2900–2960 m. At high elevations, current January precipitation, temperature in preceding August, and precipitation and temperature variability in preceding July explained 89 % of the changes in growth synchrony. At low elevations, variability of drought in October and the temperature during spring-summer accounted for 42 % of the synchrony changes. At middle elevations, only the variability of summer temperature and the drought in July explained 17 % of the synchrony changes. The high explanatory power of climatic factors for the synchrony changes at high and low elevations indicates that forest management strategies should pay increased attention to the ecological responses in these regions under changing climatic conditions.
{"title":"Synchrony patterns of radial growth of Qinghai spruce (Picea crassifolia) across elevational gradients in the eastern Qilian Mountains","authors":"Tian Chen , Yu Xia , Peiyao Tao , Jingyun Ma , Xiaohua Gou , Miaomiao Du , Fen Zhang","doi":"10.1016/j.dendro.2025.126405","DOIUrl":"10.1016/j.dendro.2025.126405","url":null,"abstract":"<div><div>Investigating the growth synchrony of a tree species across spatiotemporal scales could enhances the understanding of species' climatic responses, which is particularly critical for addressing future ecological risks under climate change. However, studies on the growth synchrony of <em>Picea crassifolia</em> across elevation remain largely unclear in the Qilian Mountains. The tree cores of 592 <em>P. crassifolia</em> were collected from nine forest sites in the eastern Qilian Mountains to investigate the tree growth synchrony and its climatic drivers. The growth synchrony of <em>P. crassifolia</em> was the highest at 3100–3200 m during 1975–2005 but showed a significant decline with time. Although it was lower, the growth synchrony of <em>P. crassifolia</em> remained stable at 2712–2800 m and 2900–2960 m. At high elevations, current January precipitation, temperature in preceding August, and precipitation and temperature variability in preceding July explained 89 % of the changes in growth synchrony. At low elevations, variability of drought in October and the temperature during spring-summer accounted for 42 % of the synchrony changes. At middle elevations, only the variability of summer temperature and the drought in July explained 17 % of the synchrony changes. The high explanatory power of climatic factors for the synchrony changes at high and low elevations indicates that forest management strategies should pay increased attention to the ecological responses in these regions under changing climatic conditions.</div></div>","PeriodicalId":50595,"journal":{"name":"Dendrochronologia","volume":"94 ","pages":"Article 126405"},"PeriodicalIF":2.3,"publicationDate":"2025-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145010682","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 : 2025-09-05DOI: 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":"2025-09-05","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}
Pub Date : 2025-09-04DOI: 10.1016/j.dendro.2025.126414
J. Julio Camarero , Águeda M. González-Rodríguez , Cristina Valeriano , Beatriz Fernández-Marín , Elisa Tamudo , Katja T. Rinne-Garmston , José Carlos Miranda
Subtropical cloud forests grow under particular climate conditions characterized by narrow thermal ranges, high relative humidity and low radiation levels. These diverse ecosystems include many endemisms and are threatened by climate and anthropogenic land-use pressures, particularly in islands. This is the case of some laurel cloud forests found in Macaronesian archipelagos such as the Canary Islands. To assess growth response to climate variability, we studied tree-ring series in three evergreen species (the Macaronesain endemisms Laurus novocanariensis and Morella faya, and the Mediterranean Prunus lusitanica) co-occurring in a laurel cloud forest (Anaga) located in Tenerife, Canary Islands, Spain. The intra-annual wood δ13C was also measured in the rings formed from 2011 to 2013 in two of these species (L. novocanariensis, P. lusitanica) to determine how they responded to the severe 2012 drought. Sampled trees were young (age ranged from 33 to 54 years). L. novocanariensis and P. lusitanica presented the highest (2.44 mm) and lowest (1.84 mm) mean growth rates, respectively. Wet, cool and foggy conditions in the prior winter enhanced the growth of L. novocanariensis and M. faya, whereas P. lusitanica was less responsive to climate variability. The tree-ring δ13C values were higher in P. lusitanica (mean ± SE = −26.10 ± 0.07 ‰) than in L. novocanariensis (-26.56 ± 0.08 ‰), and the difference intensified during the dry year of 2012. In P. lusitanica, δ13C values decreased as the number of foggy days increased. These findings demonstrate species-specific differences in growth and δ13C responsiveness to climate. The study of these proxies at different temporal resolutions highlights how reduced fog input and drought, affecting atmospheric water demand and soil moisture availability, respectively, constrain tree growth in laurel cloud forests.
{"title":"Inter- and intra-annual ring width and δ13C responses to drought in tree species of a laurel cloud forest (Tenerife, Canary Islands)","authors":"J. Julio Camarero , Águeda M. González-Rodríguez , Cristina Valeriano , Beatriz Fernández-Marín , Elisa Tamudo , Katja T. Rinne-Garmston , José Carlos Miranda","doi":"10.1016/j.dendro.2025.126414","DOIUrl":"10.1016/j.dendro.2025.126414","url":null,"abstract":"<div><div>Subtropical cloud forests grow under particular climate conditions characterized by narrow thermal ranges, high relative humidity and low radiation levels. These diverse ecosystems include many endemisms and are threatened by climate and anthropogenic land-use pressures, particularly in islands. This is the case of some laurel cloud forests found in Macaronesian archipelagos such as the Canary Islands. To assess growth response to climate variability, we studied tree-ring series in three evergreen species (the Macaronesain endemisms <em>Laurus novocanariensis</em> and <em>Morella faya,</em> and the Mediterranean <em>Prunus lusitanica</em>) co-occurring in a laurel cloud forest (Anaga) located in Tenerife, Canary Islands, Spain. The intra-annual wood δ<sup>13</sup>C was also measured in the rings formed from 2011 to 2013 in two of these species (<em>L</em>. <em>novocanariensis</em>, <em>P. lusitanica</em>) to determine how they responded to the severe 2012 drought. Sampled trees were young (age ranged from 33 to 54 years). <em>L. novocanariensis</em> and <em>P. lusitanica</em> presented the highest (2.44 mm) and lowest (1.84 mm) mean growth rates, respectively. Wet, cool and foggy conditions in the prior winter enhanced the growth of <em>L. novocanariensis</em> and <em>M. faya</em>, whereas <em>P. lusitanica</em> was less responsive to climate variability. The tree-ring δ<sup>13</sup>C values were higher in <em>P. lusitanica</em> (mean ± SE = −26.10 ± 0.07 ‰) than in <em>L. novocanariensis</em> (-26.56 ± 0.08 ‰), and the difference intensified during the dry year of 2012. In <em>P. lusitanica</em>, δ<sup>13</sup>C values decreased as the number of foggy days increased. These findings demonstrate species-specific differences in growth and δ<sup>13</sup>C responsiveness to climate. The study of these proxies at different temporal resolutions highlights how reduced fog input and drought, affecting atmospheric water demand and soil moisture availability, respectively, constrain tree growth in laurel cloud forests.</div></div>","PeriodicalId":50595,"journal":{"name":"Dendrochronologia","volume":"94 ","pages":"Article 126414"},"PeriodicalIF":2.3,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145004449","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 : 2025-09-04DOI: 10.1016/j.dendro.2025.126415
Yong Su , Wenzhi Wang , Xianliang Zhang , Zhehong Wu , Chaofeng Yuan , Lingzhuo Luo , Jiaxing Li , Yushuo Zhang
Warming-induced drought is altering forest structure and function, leading to significant declines in tree growth. However, it remains unclear which forests are most vulnerable to these stressors. Using long-term and large-scale tree-ring width and climate datasets from 1901 to 2015, we assessed drought-induced growth loss (GL), growth variability (CV), resistance (Rt) and recovery (Rc) across diverse climate regions. The results indicated that GL, CV, and Rc were significantly higher in arid regions compared to humid regions, while the opposite was true for Rt. GL, CV, and Rc exhibit a latitudinal gradient, increasing from high latitudes (80°N) to low latitudes (10°N), while they are decreasing along the aridity index (AI) gradient. Notably, GL is most pronounced in tropical and dryland, where significant growth declines showed in over 90 % of sites. Additionally, angiosperms show significantly higher GL, CV, and Rc than gymnosperms. These results highlight the need for targeted management strategies that consider the unique climatic and ecological conditions of each region to effectively mitigate tree growth loss in a warming climate.
{"title":"Arid and tropical forests face highest drought vulnerability in the Northern Hemisphere","authors":"Yong Su , Wenzhi Wang , Xianliang Zhang , Zhehong Wu , Chaofeng Yuan , Lingzhuo Luo , Jiaxing Li , Yushuo Zhang","doi":"10.1016/j.dendro.2025.126415","DOIUrl":"10.1016/j.dendro.2025.126415","url":null,"abstract":"<div><div>Warming-induced drought is altering forest structure and function, leading to significant declines in tree growth. However, it remains unclear which forests are most vulnerable to these stressors. Using long-term and large-scale tree-ring width and climate datasets from 1901 to 2015, we assessed drought-induced growth loss (GL), growth variability (CV), resistance (Rt) and recovery (Rc) across diverse climate regions. The results indicated that GL, CV, and Rc were significantly higher in arid regions compared to humid regions, while the opposite was true for Rt. GL, CV, and Rc exhibit a latitudinal gradient, increasing from high latitudes (80°N) to low latitudes (10°N), while they are decreasing along the aridity index (AI) gradient. Notably, GL is most pronounced in tropical and dryland, where significant growth declines showed in over 90 % of sites. Additionally, angiosperms show significantly higher GL, CV, and Rc than gymnosperms. These results highlight the need for targeted management strategies that consider the unique climatic and ecological conditions of each region to effectively mitigate tree growth loss in a warming climate.</div></div>","PeriodicalId":50595,"journal":{"name":"Dendrochronologia","volume":"94 ","pages":"Article 126415"},"PeriodicalIF":2.3,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145004445","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