Trees最新文献

{"title":"Divergent responses to climatic conditions in radial growth of Abies fargesii along elevation at the eastern edge of the Tibetan Plateau","authors":"Shengjie Wang,&nbsp;Yuan Jiang,&nbsp;Junti Liu,&nbsp;Shuai Yuan,&nbsp;Minghao Cui,&nbsp;Qianzhi Xiong,&nbsp;Yizaitiguli Waili,&nbsp;Muyi Kang,&nbsp;Hui Xu","doi":"10.1007/s00468-024-02533-6","DOIUrl":"10.1007/s00468-024-02533-6","url":null,"abstract":"<div><h3>Key message</h3><p>A gradual change exists in the altitudinal response of earlywood growth of <i>Abies fargesii</i> to hydrothermal conditions, with temperature being the main climatic factor controlling its latewood growth.</p><h3>Abstract</h3><p>The Tibetan Plateau, as the “Third Pole”, has witnessed profound and intricate effects of climate change in recent decades. This may result in different responses of tree radial growth to climatic factors in this region, varying with elevation and growth stages. To accurately reveal these different responses we established totalwood, earlywood and latewood width chronologies of <i>Abies fargesii</i> at four elevations. Our results showed that: (1) As the elevation increases, the response of radial growth of <i>Abies fargesii</i> to climatic factors shifted from restriction primarily by water deficiency caused by rapid warming, to weak restriction by winter precipitation with favorable hydrothermal conditions, and then to double restriction owing to insufficient heat and excessive moisture. This pattern was inconsistent with the relationship between the radial growth and climatic factors for latewood observed at the low and middle–low elevations. (2) There existed a temporal variability in the relationship between tree radial growth and restrictive climate factors. This unstable relationship was mainly observed in the middle–low elevation within suitable ecological conditions and during the later stages of tree radial growth with lower growth rates. This is related to the fact that more suitable ecological conditions and lower growth rates make tree growth more susceptible to climatic fluctuations. Considering these findings, if the climate would experience further cooling and humidity increasing in the study region, the growth of <i>Abies fargesii</i> might be more adversely affected at high elevation. For economic and ecological considerations, the afforestation of <i>Abies fargesii</i> should be prioritized in the middle–low elevation zones where favorable for the population distribution.</p></div>","PeriodicalId":805,"journal":{"name":"Trees","volume":"38 4","pages":"1035 - 1048"},"PeriodicalIF":2.1,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141511598","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}

{"title":"High temperature germinated pecan seeds by transcriptome and metabolome analysis","authors":"Tingting Xue,&nbsp;Can Yang,&nbsp;Sumei Qiu,&nbsp;Jia Liu,&nbsp;Yingdan Yuan","doi":"10.1007/s00468-024-02540-7","DOIUrl":"10.1007/s00468-024-02540-7","url":null,"abstract":"<div><p>The pecan tree is a globally recognized fruit-bearing tree of significant economic value. This paper focused on the dynamic changes that occur during the germination stages of pecan seeds. To investigate alterations in transcription and metabolism during the germination process, this paper employed UPLC–MS/MS technology to evaluate the shifts in the metabolite composition of pecan seeds during four different germination processes. This paper unveiled a total of 1426 metabolites, encompassing various categories such as flavonoids, phenolic acids, amino acid derivatives, lipids, and alkaloids. Furthermore, the exploration of the transcriptome through GO and KEGG enrichment analyses revealed a common pathway across all control groups—the “phytohormone signal transduction” pathway. This finding underscores the pivotal role of phytohormones in regulating diverse stages of pecan seed germination. In addition, the investigation into the interplay between differentially expressed genes and metabolites highlighted two key plant hormones, ABA and GA3, as essential drivers of seed germination. Within the ABA synthesis pathway, we observed elevated expression of NCED during the S1 stage, leading us to speculate that NCED is a key enzyme in ABA synthesis. Conversely, GA3ox and GGPPS displayed heightened expression during the S2 and S4 stages, respectively, signifying their critical roles in the GA3 synthesis pathway. To validate our findings, we performed qRT-PCR analysis on nine key genes. In conclusion, this study integrated metabolomics and transcriptomics techniques, furnishing a vital foundational framework for unraveling the intricate molecular mechanisms governing metabolite accumulation in pecan seeds at various stages of germination.</p></div>","PeriodicalId":805,"journal":{"name":"Trees","volume":"38 5","pages":"1119 - 1136"},"PeriodicalIF":2.1,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141511596","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}

{"title":"Growth rate determines the superior xylem growth of Siberian spruce over Siberian larch in the southern Altai Mountains, Northwest China","authors":"Wenjin Wang,&nbsp;Jian-Guo Huang,&nbsp;Feiyu Yang,&nbsp;Peng Zhou,&nbsp;Zhou Wang,&nbsp;Sergio Rossi","doi":"10.1007/s00468-024-02535-4","DOIUrl":"10.1007/s00468-024-02535-4","url":null,"abstract":"<div><h3>Key message</h3><p><b>Despite the better performance in wood growth compared with Siberian larch, Siberian spruce may be more vulnerable to ongoing climate change.</b></p><h3>Abstract</h3><p>Understanding the species-specific wood formation kinetics is critical to assess forest growth and carbon sequestration under climate warming; however, such knowledge is still scarce in the fragile forest ecosystems of arid and semi-arid central Asia. Here, we monitored wood formation in two dominant tree species Siberian spruce (<i>Picea obovata</i> Ledeb.) and Siberian larch (<i>Larix sibirica</i> Ledeb.) during 2018 and 2019 at two sites in the southern Altai Mountains, northwest China, and aimed to describe the intra-annual dynamics of wood formation and to understand the annual variation in growth and carbon sequestration of these two species. Results show that the differences in wood production between species were remarkable. Siberian spruce produced 68.5–87.6 cells year⁻¹ at an average rate of 0.82–0.95 cells day⁻¹, about twofold higher than Siberian larch. The differences between species in terms of the onset, cessation timing, and duration of cell production were marginal. Cell production of both species started from mid-May to early June, ceased from early to mid-August, and lasted for about 64 to 70 days. The higher growth rate of spruce led to greater wood production compared to larch. The longer growing seasons induced by climate warming may not result in increased forest growth, thereby failing to enhance carbon sequestration in arid and semi-arid taiga of Central Asia.</p></div>","PeriodicalId":805,"journal":{"name":"Trees","volume":"38 4","pages":"1049 - 1062"},"PeriodicalIF":2.1,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141511597","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}

{"title":"Applying plant–plant interaction theory to advance tropical dry forest restoration","authors":"Rosita Villegas,&nbsp;Eugenio Larios,&nbsp;Ricardo E. Félix-Burruel,&nbsp;Angelina Martínez-Yrízar,&nbsp;Adrián Bojórquez,&nbsp;Bárbara Larraín-Barrios,&nbsp;Juan C. Álvarez-Yépiz","doi":"10.1007/s00468-024-02532-7","DOIUrl":"10.1007/s00468-024-02532-7","url":null,"abstract":"<div><h3>Key message</h3><p>Species interactions should be considered during the design of restoration plans for tropical dry forests.</p><h3>Abstract</h3><p>Legume trees dominate old-growth and regenerating tropical dry forests with some pioneers becoming temporarily monodominant during secondary succession. Yet, the mechanisms promoting legume coexistence in this ecosystem are poorly understood but essential to develop restoration strategies for degraded forests. We studied plant–plant interactions in the regeneration niche of an early and a late successional legume tree species, increasingly co-occurring in northwestern Mexico due to persistent climatic and anthropogenic disturbance that is altering forest dynamics. Our experiment comprised two species (<i>Acacia cochliacantha</i>, typical early successional and monodominant, and <i>Lysiloma watsonii</i>, typical late successional) × two habitats (direct light and shade) × three plant interaction treatments (control, intraspecific and interspecific). Each of the 12 experimental units contained 20 pots, totaling 240 replicates. We examined germination, seedling survival, and growth dynamics and determined seedling dry mass (total and root: shoot) at the end of the experiment. Our results suggest that legume monodominance in regenerating tropical dry forests starts early during germination and may be temporarily maintained through the interplay between interspecific facilitation and intraspecific competition. In contrast, late successional species may avoid negative heterospecific interactions by recruiting later (benefiting from neighbors’ shade) and maintaining neutral associations with conspecifics since early ontogenetic stages. Therefore, a cautious selection of early and late successional species and their spatial arrangement should be considered during the planning stage of restoration programs for tropical dry forests. Advancing our understanding of plant interactions in tropical dry forests should lead us to develop better tools for restoring this highly degraded ecosystem.</p></div>","PeriodicalId":805,"journal":{"name":"Trees","volume":"38 4","pages":"1023 - 1033"},"PeriodicalIF":2.1,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141530358","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}

{"title":"Seasonal coordination of aboveground vegetative and reproductive growth and storage in apple trees subjected to defoliation, flower and fruit thinning","authors":"Lenka Plavcová,&nbsp;Radek Jupa,&nbsp;Günter Hoch,&nbsp;Martin Mészáros,&nbsp;Klára Scháňková","doi":"10.1007/s00468-024-02539-0","DOIUrl":"10.1007/s00468-024-02539-0","url":null,"abstract":"<div><h3>Key message</h3><p>The growth rates of current-year shoots, fruits and trunks in apple trees peak sequentially during the growing season. The period of most intense growth coincided with the lowest NSC reserves.</p><h3>Abstract</h3><p>Vegetative and reproductive growth and storage are major carbon sinks in fruit trees; however, little is known about their mutual seasonal coordination. In this study, we monitored growth dynamics of trunks, fruits and current-year shoots together with the concentration of non-structural carbohydrates (NSC) in trees subjected to defoliation, early season flower thinning, mid-season fruit thinning and their respective combinations across the season. We found that defoliation had a negative effect on both trunk radial growth and annual fruit yield. Flower and fruit thinning caused lower fruit number per tree, but the individual fruits were larger resulting in a similar annual fruit yield among the treatments. Shoot extension growth was not significantly affected by the defoliation and flower and fruit thinning treatments. The concentration of non-structural carbohydrates was also similar across treatments. Modelled daily growth rates of shoots, fruits and trunks peaked sequentially one after another throughout the growing season with a delay of 15 and 18 days, respectively. The period of most intense growth of tree’s organs corresponded well with the lowest NSC reserves and a temporary depletion of starch in 1-year-old branches. Taken together, our study illustrates a tight temporal coordination of major carbon sinks and improves our understanding of sink/source relations of commercially important apple trees.</p></div>","PeriodicalId":805,"journal":{"name":"Trees","volume":"38 5","pages":"1109 - 1118"},"PeriodicalIF":2.1,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00468-024-02539-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141511599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Maturation and quality of seeds of Euterpe edulis Martius assessed by imaging and X-ray densitometry","authors":"Tamyris de Mello,&nbsp;Tadeu Ériton Caliman Zanardo,&nbsp;Yanara dos Santos Taliuli,&nbsp;Ingridh Medeiros Simões,&nbsp;Julcinara Oliveira Baptista,&nbsp;Fabricio Gomes Gonçalves,&nbsp;Clovis Eduardo Nunes Hegedus,&nbsp;Edilson Romais Schmildt,&nbsp;Adésio Ferreira,&nbsp;Heloisa Oliveira dos Santos,&nbsp;José Carlos Lopes,&nbsp;Wagner Campos Otoni,&nbsp;Rodrigo Sobreira Alexandre","doi":"10.1007/s00468-024-02538-1","DOIUrl":"10.1007/s00468-024-02538-1","url":null,"abstract":"<div><h3>Key message</h3><p> The 164 DAA maturation stage is superior in terms of germination and seedling formation, with gains of 4.2 months in relation to the last stage, and X-ray densitometry is a new and efficient technique to analyze <i>Euterpe edulis</i> seeds.</p><p><b>Abstract</b><i>Euterpe edulis</i> Martius is an endangered palm species that grows in the Atlantic Forest and the Cerrado of South America. Economic exploitation of its antioxidant-rich fruits could ensure the sustainable management of this species. However, this relies on the rapid selection of high-quality seeds from which to derive seedlings. Image analysis and X-ray densitometry can be quick, practical, and best of all, non-destructive techniques for selecting seeds, ensuring the sustainability of the species. The objective of this study was to investigate the maturation of <i>E. edulis</i> seeds using image analysis and X-ray densitometry. Fruits were harvested from ten matrices at different stages of maturation, from 94 days after anthesis (DAA) to 290 DAA. Seed dry mass, water content, germination, vigor, and density were quantified at each stage. At the same time, seeds were analyzed by GroundEye^® imaging, radiography, scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS). The design was completely randomized and consisted of 29 treatments (maturation stages) and four replications with 10 seeds each. The highest dry mass was detected 255 DAA (0.83 g), <i>in vitro</i> germination began 115 DAA and achieved 100% from 150 DAA, and maximum vigor was observed 164 DAA, whereby 100% of seedlings appeared normal. X-ray imaging revealed dehydrated seeds and small mechanical damage, such as cracking of the pericarp. X-ray densitometry revealed that seed density increased considerably 185 DAA. SEM/EDS detected changes between maturation stages, such as the accumulation of K and Si, in the mesocarp and endocarp. Overall, <i>E. edulis</i> seeds presented maximum in vitro germination, vigor, percentage of normal seedlings, and physicochemical qualities 164 DAA (green epicarp), which corresponds to 126 days earlier compared with the fruits harvested 290 DAA (black epicarp) for ex vitro germination. The analyses proposed in this study, together with the analysis of seed germination and vigor throughout maturation, were promising for increasing the speed, classification accuracy, and selection of <i>E. edulis</i> seeds. Such analyses have a high potential since they are practical and many are non-destructive, adding cost-benefit with accurate results.</p></div>","PeriodicalId":805,"journal":{"name":"Trees","volume":"38 5","pages":"1095 - 1108"},"PeriodicalIF":2.1,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141511628","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}

{"title":"Genetic relationships of Michelia compressa (Magnoliaceae) with Michelia species and its improvement by interspecific hybridization","authors":"Luomin Cui,&nbsp;Xiangdong Liu,&nbsp;Jiaqi Liu,&nbsp;Zhiquan Wang,&nbsp;Ziyang Wang,&nbsp;Ying Yang,&nbsp;Chaoguang Yu,&nbsp;Fangyuan Yu,&nbsp;Yunlong Yin,&nbsp;David Creech,&nbsp;Ming Yin,&nbsp;Sijun Zheng","doi":"10.1007/s00468-024-02537-2","DOIUrl":"10.1007/s00468-024-02537-2","url":null,"abstract":"&lt;div&gt;&lt;p&gt;The genus &lt;i&gt;Michelia&lt;/i&gt; encompasses important plants for landscaping and timber, with a wide global distribution. However, the genetic interrelations among species within the genus are not well understood. This study aims to clarify the genetic connections between &lt;i&gt;Michelia compressa&lt;/i&gt; (Maxim.) Sarg. (Magnoliaceae) and other species in the genus to probe the potential improvement by interspecific hybridization. The work progresses in three phases: understanding &lt;i&gt;M. compressa&lt;/i&gt;’s genetic architecture and its relevance to other &lt;i&gt;Michelia&lt;/i&gt; species, identifying natural hybrids among progeny, and developing novel varieties through hybridization. First, the genome from &lt;i&gt;M. compressa&lt;/i&gt; was analyzed to confirm its genetic background. The result shows it had 17 pairs of metacentric and 2 pairs of submetacentric chromosomes (2&lt;i&gt;n&lt;/i&gt; = 2&lt;i&gt;x&lt;/i&gt; = 38, 34m + 4sm), belonging to Stebbins type 2B, which was consistent with the &lt;i&gt;Michelia&lt;/i&gt; uniform karyotype formula. Second, transcriptomic data were used to design ten pairs of simple sequence repeat (SSR) primers. The set of ten SSR primers exhibited a high level of polymorphism and were found to be efficient for genotyping. The average number of alleles (Na) per locus was 14.6, with an average expected heterozygosity (He) of 0.860, observed heterozygosity (Ho) of 0.447, and polymorphic information content (PIC) of 0.847. These universal primers were then employed to determine genetic relationships among &lt;i&gt;Michelia&lt;/i&gt; species and create SSR fingerprints for 20 Magnoliaceae species. The cluster analysis results revealed that Magnoliaceae was classified into three branches, while &lt;i&gt;Michelia&lt;/i&gt; was classified into five branches. &lt;i&gt;M. compressa&lt;/i&gt; exhibits a close phylogenetic relationship with both &lt;i&gt;M. maudiae&lt;/i&gt; and &lt;i&gt;M. cavaleriei&lt;/i&gt; var. &lt;i&gt;platypetala&lt;/i&gt;. Third, according to the fingerprinting information, all 19 progeny from open-pollinated &lt;i&gt;M. compressa&lt;/i&gt;, i.e., &lt;i&gt;M.&lt;/i&gt; ‘Zhongshanhanxiao’, were confirmed to be true hybrids resulting from natural crosses. The putative progenitors of &lt;i&gt;M&lt;/i&gt;. ‘Zhongshanhanxiao’ are believed to be &lt;i&gt;M. maudiae&lt;/i&gt; and &lt;i&gt;M. cavaleriei&lt;/i&gt; var. &lt;i&gt;platypetala&lt;/i&gt;. &lt;i&gt;M. compressa&lt;/i&gt; demonstrates a significant hybrid affinity with both &lt;i&gt;M. maudiae&lt;/i&gt; and &lt;i&gt;M. cavaleriei&lt;/i&gt; var. &lt;i&gt;platypetala&lt;/i&gt;. The SSR primers developed were used to identify hybrids, particularly in the &lt;i&gt;M. compressa&lt;/i&gt; × &lt;i&gt;M. maudiae&lt;/i&gt; and &lt;i&gt;M. compressa&lt;/i&gt; × &lt;i&gt;M. cavaleriei&lt;/i&gt; var&lt;i&gt;. platypetala&lt;/i&gt; combinations, where a substantial proportion of true hybrids were found. Further analysis suggests that the probable progenitors of &lt;i&gt;M&lt;/i&gt;. ‘Zhongshanhanxiao’ are either &lt;i&gt;M. maudiae&lt;/i&gt; or &lt;i&gt;M. cavaleriei&lt;/i&gt; var. &lt;i&gt;platypetala&lt;/i&gt;. This research yields significant insights into the genetic relationships of &lt;i&gt;M. compressa&lt;/i&gt;, as well as the prospects for genetic enhancement via interspecific hybridization. Furthermore, it establishes a th","PeriodicalId":805,"journal":{"name":"Trees","volume":"38 5","pages":"1079 - 1094"},"PeriodicalIF":2.1,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141511629","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}

{"title":"Diversity of visitors to the flowers of two palm species of the genus Oenocarpus in the Province of Napo, Ecuador","authors":"Jomira Gabriela Tapuy Aguinda,&nbsp;Maria Cristina Peñuela Mora","doi":"10.1007/s00468-024-02524-7","DOIUrl":"10.1007/s00468-024-02524-7","url":null,"abstract":"<div><p>In Ecuador, between the foothills of the Andes and the well-drained terra firme forests of the Amazon, there are two useful palm species, <i>Oenocarpus bataua</i> and <i>O. mapora</i>, which differ mainly in size. Both species are negatively affected by deforestation and land conversion for agriculture and cattle ranching, altering the structure and functioning of ecosystems. Management and restoration plans are therefore needed. To contribute with local knowledge of the species, we studied the diversity of flower visitors of both species in 9 sites in Napo Province during the flowering seasons of 2021 and 2022. We collected 16 inflorescences and measured the length, number of rachillae and flowers of each and correlated them with the richness and abundance of their floral visitors. Finally, we calculated a similarity index between species and developed an interaction network to observe associations between their inflorescences and flower visitors. We found 89 morphospecies of flower visitors, 77 in <i>O. bataua</i> and 51 in <i>O. mapora</i>, and 19 morphospecies are potential pollinators because they are active during the staminate and pistillate phases. This is the first report of flower visitors of <i>O. mapora</i> in western Amazonia, and it shared 40% of flower visitors with O. bataua, which is a higher percentage than previously reported between <i>O. bataua</i> and other species of the genus. The most common morphotypes in the staminate phase were <i>Discocoris drakei</i>, <i>Notesia</i> sp.2, <i>Andrathobius</i> sp.1, <i>Mystrops vasquezi</i>, and in the pistillate phase: <i>D. drakei</i>, <i>A. bicarinatus</i> and <i>Phylotrox</i> sp.1. These insect species should be taken into consideration when monitoring the status of the palm species and for conservation plans.</p></div>","PeriodicalId":805,"journal":{"name":"Trees","volume":"38 4","pages":"915 - 926"},"PeriodicalIF":2.1,"publicationDate":"2024-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141511630","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}

{"title":"A climate sensitive nonlinear mixed-effects height to crown base model: a study focuses on Phyllostachys pubescens","authors":"Xiao Zhou,&nbsp;Xuan Zhang,&nbsp;Zhen Li,&nbsp;Liyang Liu,&nbsp;Ram P. Sharma,&nbsp;Fengying Guan","doi":"10.1007/s00468-024-02514-9","DOIUrl":"10.1007/s00468-024-02514-9","url":null,"abstract":"<div><h3>Key message</h3><p>A climate-sensitive height to crown base (HCB) model developed by combining a nonlinear mixed-effects model and dummy variable approach led to higher prediction accuracy of HCB than those without climatic variables for moso bamboo.</p><p>Height to crown base (HCB) is one of the important variables used in forest growth and yield models, as it is crucial for assessing vitality, competition, growth and development stage, stability, and production efficiency of the individuals. As climate impact is substantial on HCB, its inclusion of any forest model is crucial to make the model climate sensitive. However, existing HCB models do not consider climate impact on <i>Phyllostachys pubescens</i> (moso bamboo) HCB. With data collected from 26 moso bamboo sample plots in Jiangsu and Fujian provinces in China, we used five common HCB functions to develop climate sensitive HCB models. Modeling showed the significant effects of two individual variables (height—<i>H</i>, diameter at breast height—DBH), two stand-level variables (quadratic mean DBH—QMD, canopy density—CD), and two climate variables (extreme maximum temperature—EXT and Hargreaves’ climatic moisture deficit—CMD) on HCB. Compared with the basic model, the introduction of covariates (QMD, CD, EXT and CMD), dummy variable (regions), and random effects (block- and sample plot-level random effects) resulted in increased <i>R</i>² by 5.01%, 7.13%, 7.14%, and 13.34%, respectively. The logistic model provided better fit statistics than other models we evaluated. Two-level nonlinear mixed-effects (NLME) models significantly improved fit statistics. Response calibration (model localization) with two medium-sized bamboos per sample plot provided the optimal prediction accuracy. This strategy can be considered as a reasonable compromise between the measurement costs and errors for HCB prediction.</p></div>","PeriodicalId":805,"journal":{"name":"Trees","volume":"38 4","pages":"849 - 862"},"PeriodicalIF":2.1,"publicationDate":"2024-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141511631","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}

{"title":"A screening analysis of foliar terpene emissions of 36 rainforest tree species in French Guiana and their relationships with seasonality","authors":"Joan Llusià,&nbsp;Dolores Asensio,&nbsp;Jordi Sardans,&nbsp;Iolanda Filella,&nbsp;Guille Peguero,&nbsp;Oriol Grau,&nbsp;Romà Ogaya,&nbsp;Ifigenia Urbina,&nbsp;Albert Gargallo-Garriga,&nbsp;Lore T. Verryckt,&nbsp;Leandro Van Langenhove,&nbsp;Laëtitia M. Brechet,&nbsp;Elodie Courtois,&nbsp;Clément Stahl,&nbsp;Ivan A. Janssens,&nbsp;Josep Peñuelas","doi":"10.1007/s00468-024-02530-9","DOIUrl":"10.1007/s00468-024-02530-9","url":null,"abstract":"<div><h3>Key message</h3><p>Inventory and seasonal variation of terpene emissions from tropical trees in French Guiana: implications for environmental and ecological roles.</p><h3>Abstract</h3><p>A limited understanding of foliar terpene emissions from different tree species is prominent in diverse tropical forests. We conducted a study in French Guiana, screening BVOC emissions from 36 tropical woody species. We focused on 32 species in the dry season and 33 in the wet season, documenting terpene emissions for the first time in some of these tree species. Our findings show that 93.8% emitted terpenes in the dry season, while only 33.3% did so in the wet season. Terpene emissions ranged from 0.01 to 80.9 μg g⁻¹ h⁻¹ in the dry season and 0 to 11.7 μg g⁻¹ h⁻¹ in the wet season, consistent with previous reports. We identified and quantified 23 terpene compounds, including 19 monoterpenes and 4 sesquiterpenes. Additionally, 2 non-terpenoid compounds were detected: 2,2,4,6,6-pentamethylheptane (with no detected emissions in the dry season) and toluene. Among the monoterpenes, the most abundant were α-terpinolene, limonene, α-pinene, β-ocimene, and sabinene. As for sesquiterpenes, β-caryophyllene, α-caryophyllene, and α-copaene were observed during the dry season, while during the wet season, α-terpinolene predominated, followed by limonene, α-pinene, sabinene, β-caryophyllene, and α-copaene. Isoprene was detected in most of the species studied in both seasons. Sesquiterpene emissions displayed a notable phylogenetic pattern, whereas total terpenes and monoterpenes did not; however, total terpenes and monoterpenes exhibited a significant seasonal influence. Our study demonstrates that seasonality strongly influences BVOC production in tropical trees, with higher emissions in the dry season. These findings imply that various factors and conditions influence tree emissions in this tropical forest, affecting their ecological, environmental, and climatic roles, as well as the implementation of atmospheric chemistry models.</p></div>","PeriodicalId":805,"journal":{"name":"Trees","volume":"38 4","pages":"997 - 1012"},"PeriodicalIF":2.1,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141511632","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}