10 results on '"Raumonen P"'
Search Results
2. Terrestrial laser scanning and low magnetic field digitization yield similar architectural coarse root traits for 32-year-old Pinus ponderosa trees
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Montagnoli, Antonio, Hudak, Andrew T., Raumonen, Pasi, Lasserre, Bruno, Terzaghi, Mattia, Silva, Carlos A., Bright, Benjamin C., Vierling, Lee A., de Vasconcellos, Bruna N., Chiatante, Donato, and Dumroese, R. Kasten
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- 2024
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3. Limitations of estimating branch volume from terrestrial laser scanning
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Morhart, Christopher, Schindler, Zoe, Frey, Julian, Sheppard, Jonathan P., Calders, Kim, Disney, Mathias, Morsdorf, Felix, Raumonen, Pasi, and Seifert, Thomas
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- 2024
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4. Edge effects on tree architecture exacerbate biomass loss of fragmented Amazonian forests
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Nunes, Matheus Henrique, Vaz, Marcel Caritá, Camargo, José Luís Campana, Laurance, William F., de Andrade, Ana, Vicentini, Alberto, Laurance, Susan, Raumonen, Pasi, Jackson, Toby, Zuquim, Gabriela, Wu, Jin, Peñuelas, Josep, Chave, Jérôme, and Maeda, Eduardo Eiji
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- 2023
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5. Phyllotaxis transition over the lifespan of a palm tree using Magnetic Resonance Imaging (MRI) and Terrestrial Laser Scanning (TLS): the case of Jubaea chilensis
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Guzmán, Eduardo, Fernández, M. Paulina, Alcalde, José-Antonio, Contreras, Samuel, Raumonen, Pasi, Picco, Lorenzo, Montalba, Cristián, and Tejos, Cristián
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- 2022
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6. East African megafauna influence on vegetation structure permeates from landscape to tree level scales.
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Sorokina, Hanna Elisabet, Nunes, Matheus Henrique, Heiskanen, Janne, Munyao, Martha, Mwang'ombe, James, Pellikka, Petri, Raumonen, Pasi, and Maeda, Eduardo Eiji
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AFRICAN elephant ,MEGAFAUNA ,FOREST density ,PLANT conservation ,WILDLIFE refuges - Abstract
African savanna elephants (Loxodonta africana) can substantially modify their habitat through their interactions with woody vegetation. Nonetheless, the scale, intensity and characteristics of these relations are not yet fully understood. Consequently, it is unclear how vegetation-megafauna interactions can be disrupted by external factors, such as land management. This study attempted to quantify and characterize structural changes in vegetation caused by elephants, from landscape to tree level scales. We applied multi-scale geospatial tools, including airborne (ALS) and terrestrial laser scanning (TLS), to address the following questions: (1) How do elephants shape landscape level vegetation structure in conservation areas? (2) Are the impacts of elephants evident on individual tree architecture? Our study area was located at the Taita Hills Wildlife Sanctuary in South-eastern Kenya. The occurrence of elephants was estimated using elephant observation records and proximity to elephant tracks. Landscape level structure was assessed using tree density maps calculated based on individually detected treetops from ALS data. Next, TLS measurements of 72 trees were processed using quantitative structural modelling to characterize their architecture. Our results demonstrate a widespread influence of elephants on both landscape and tree level structural characteristics. This influence was strongly mediated by management, as we observed differences in vegetation structure inside and outside conservation areas. Tree density was up to 42% lower (5.84 trees/ha) in conservation areas than in non-conservation areas (10.17 trees/ha). Trees were relatively larger with closer proximity to elephant tracks, while smaller trees were more often observed in areas further away from elephants. At an architectural level, trees closer to elephant tracks had lower ratio between the crown length and the tree height, demonstrating a substantial influence of elephants on the morphological characteristics of trees. Our results highlight the importance of accounting for vegetation fauna interactions when planning conservation areas in African savannahs. • We quantified structural changes in vegetation caused by elephants at multiple scales. • The impacts of elephants were assessed using airborne and terrestrial LiDAR. • We demonstrate the influence of elephants on landscape and individual tree levels. • Tree density was up to 42% lower in conservation areas than in non-conservation areas. • Trees consumed by elephants had reduced crown length-to-height ratio. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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7. A non-destructive approach to estimate buttress volume using 3D point cloud data.
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Han, Tao, Raumonen, Pasi, and Sánchez-Azofeifa, G. Arturo
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POINT cloud ,BIOMASS estimation ,AKAIKE information criterion ,FOREST dynamics ,TROPICAL forests - Abstract
Buttressed trees provide mechanical support for themselves and offer essential ecological functions, such as nutrient acquisition, while being one of the largest sources of volume or biomass estimation variation in tropical forests. In this study, we collected 51 buttressed trees from (33) Democratic Republic of Congo, (12) Indonesia, and (6) Costa Rica, including (48) point clouds, and (3) destructive measurement. Specifically, we compared the performance of the Alpha Shape Algorithm (ASA) and the Slice Triangulation (ST) method on buttress volume estimation based on 30 point clouds with two species. Six point clouds from Costa Rica were used to validate the 3D surface reconstruction method. Meanwhile, we developed three allometric models based on 36 point clouds: a diameter above the buttress-based (DAB, 39 to 203 cm) model, a diameter computed from the non-convex area (D area130) model, and the convex hull perimeter (D convex130) of the breast height model. The developed models were validated with independent data, including (6) point clouds and (3) destructive measurements, to highlight the broader contextualization and application of these methods. Volume estimated by the ASA and ST showed a high agreement with the reference volume acquired using the Smalian formula (relative RMSE of 0.07 and 0.11, respectively, regardless of species effect). ASA was also robust when modeling trees with more and shallower horizontal buttresses. D area130 was the most accurate predictor to estimate buttress volume, with a lower Akaike information criterion (−66.25) than DAB (−59.55) and D convex130 (30.56); however, DAB and D area130 (relative RMSE of 0.21 and 0.23, respectively) showed similar performance when validated with independent datasets. Our results indicate that the ASA approach performs better than both the ST and allometric models used in this study. Furthermore, the ASA method can help correct the bias in the present and past estimates of volume and biomass of large trees, which are foundational components for understanding biomass allocation and dynamics in tropical forests contemporary fields. • The alpha shape and slice triangulation methods show similar performance on buttress volume estimation. • The alpha shape algorithm overestimates volume when the tree presents more and shallower horizontal buttresses. • Concerning allometric models, D area130 is the most robust predictor to estimate buttress volume. • The 3D surface reconstruction methods outperform traditional allometric models to estimate buttress volume. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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8. The community of root fungi is associated with the growth rate of Norway spruce (Picea abies).
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Hamberg L, Vanhatalo J, Velmala S, Taylor AFS, MacKay J, Caron S, Asiegbu FO, Sievänen R, Raumonen P, Hytönen T, and Pennanen T
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- Norway, Symbiosis, Fungi genetics, Fungi classification, Fungi growth & development, Ascomycota genetics, Ascomycota growth & development, Picea microbiology, Picea growth & development, Plant Roots microbiology, Plant Roots growth & development, Mycorrhizae genetics, Mycorrhizae growth & development, Mycorrhizae physiology
- Abstract
Our study delved into the relationship between root-associated fungi, gene expression and plant morphology in Norway spruce cuttings derived from both slow-and fast-growing trees. We found no clear link between the gene expression patterns of adventitious roots and the growth phenotype, suggesting no fundamental differences in the receptiveness to fungal symbionts between the phenotypes. Interestingly, saplings from slow-growing parental trees exhibited a higher richness of ectomycorrhizal species and larger roots. Some ectomycorrhizal species, typically found on mature spruces, were more prevalent on saplings from slow-growing spruces. The ericoid mycorrhizal fungus, Hyaloscypha hepaticola, showed a stronger association with saplings from fast-growing spruces. Moreover, saplings from slow-growing spruces had a greater number of Ascomycete taxa and free-living saprotrophic fungi. Aboveground sapling stems displayed some phenotypic variation; saplings from fast-growing phenotypes had longer branches but fewer whorls in their stems compared to those from the slow-growing group. In conclusion, the observed root-associated fungi and phenotypic characteristics in young Norway spruces may play a role in their long-term growth rate. This suggests that the early interactions between spruces and fungi could potentially influence their growth trajectory., (© 2024 The Author(s). Environmental Microbiology published by John Wiley & Sons Ltd.)
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- 2024
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9. Tree architecture: A strigolactone-deficient mutant reveals a connection between branching order and auxin gradient along the tree stem.
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Su C, Kokosza A, Xie X, Pěnčík A, Zhang Y, Raumonen P, Shi X, Muranen S, Topcu MK, Immanen J, Hagqvist R, Safronov O, Alonso-Serra J, Eswaran G, Venegas MP, Ljung K, Ward S, Mähönen AP, Himanen K, Salojärvi J, Fernie AR, Novák O, Leyser O, Pałubicki W, Helariutta Y, and Nieminen K
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- Trees, Lactones, Betula, Gene Expression Regulation, Plant, Plant Growth Regulators, Indoleacetic Acids
- Abstract
Due to their long lifespan, trees and bushes develop higher order of branches in a perennial manner. In contrast to a tall tree, with a clearly defined main stem and branching order, a bush is shorter and has a less apparent main stem and branching pattern. To address the developmental basis of these two forms, we studied several naturally occurring architectural variants in silver birch ( Betula pendula ). Using a candidate gene approach, we identified a bushy kanttarelli variant with a loss-of-function mutation in the BpMAX1 gene required for strigolactone (SL) biosynthesis. While kanttarelli is shorter than the wild type (WT), it has the same number of primary branches, whereas the number of secondary branches is increased, contributing to its bush-like phenotype. To confirm that the identified mutation was responsible for the phenotype, we phenocopied kanttarelli in transgenic BpMAX1::RNAi birch lines. SL profiling confirmed that both kanttarelli and the transgenic lines produced very limited amounts of SL. Interestingly, the auxin (IAA) distribution along the main stem differed between WT and BpMAX1::RNAi . In the WT, the auxin concentration formed a gradient, being higher in the uppermost internodes and decreasing toward the basal part of the stem, whereas in the transgenic line, this gradient was not observed. Through modeling, we showed that the different IAA distribution patterns may result from the difference in the number of higher-order branches and plant height. Future studies will determine whether the IAA gradient itself regulates aspects of plant architecture., Competing Interests: Competing interests statement:The authors declare no competing interest.
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- 2023
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10. 4DRoot: Root phenotyping software for temporal 3D scans by X-ray computed tomography.
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Herrero-Huerta M, Raumonen P, and Gonzalez-Aguilera D
- Abstract
Currently, plant phenomics is considered the key to reducing the genotype-to-phenotype knowledge gap in plant breeding. In this context, breakthrough imaging technologies have demonstrated high accuracy and reliability. The X-ray computed tomography (CT) technology can noninvasively scan roots in 3D; however, it is urgently required to implement high-throughput phenotyping procedures and analyses to increase the amount of data to measure more complex root phenotypic traits. We have developed a spatial-temporal root architectural modeling software tool based on 4D data from temporal X-ray CT scans. Through a cylinder fitting, we automatically extract significant root architectural traits, distribution, and hierarchy. The open-source software tool is named 4DRoot and implemented in MATLAB. The source code is freely available at https://github.com/TIDOP-USAL/4DRoot. In this research, 3D root scans from the black walnut tree were analyzed, a punctual scan for the spatial study and a weekly time-slot series for the temporal one. 4DRoot provides breeders and root biologists an objective and useful tool to quantify carbon sequestration throw trait extraction. In addition, 4DRoot could help plant breeders to improve plants to meet the food, fuel, and fiber demands in the future, in order to increase crop yield while reducing farming inputs., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2022 Herrero-Huerta, Raumonen and Gonzalez-Aguilera.)
- Published
- 2022
- Full Text
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