Bibliografías temáticas / Dawn redwood

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Literatura académica sobre el tema "Dawn redwood"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 31 de julio de 2024

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Artículos de revistas sobre el tema "Dawn redwood"

Ahuja, M. R. "Strategies for conservation of germplasm in endemic redwoods in the face of climate change: a review". Plant Genetic Resources 9, n.º 3 (4 de febrero de 2011): 411–22. http://dx.doi.org/10.1017/s1479262111000153.

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This study reviews the various conservation strategies applied to the four redwood species, namely coast redwood (Sequoia sempervirens), Sierra redwood or giant sequoia (Sequoiadendron giganteum), dawn redwood (Metasequoia glyptostroboides) and South American redwood or alerce (Fitzroya cupressoides), which are endemic in the USA, China and South America, respectively. All four redwood genera belong to the family Cupressaceae; they are monospecific, share a number of common phenotypic traits, including red wood, and are threatened in their native ranges due to human activity and a changing climate. Therefore, the management objective should be to conserve representative populations of the native species with as much genetic diversity as possible for their future survival. Those representative populations exhibiting relatively high levels of genetic diversity should be selected for germplasm preservation and monitored during the conservation phase by using molecular markers. In situ and ex situ strategies for the preservation of germplasm of the redwoods are discussed in this study. A holistic in situ gene conservation strategy calls for the regeneration of a large number of diverse redwood genotypes that exhibit adequate levels of neutral and adaptive genetic variability, by generative and vegetative methods for their preservation and maintenance in their endemic locations. At the same time, it would be desirable to conserve the redwoods in new ex situ reserves, away from their endemic locations with similar as well as different environmental conditions for testing their growth and survival capacities. In addition, other ex situ strategies involving biotechnological approaches for preservation of seeds, tissues, pollen and DNA in genebanks should also be fully exploited in the face of global climate change.

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Gressitt, J. Linsley. "The California Academy-Lingnan Dawn-Redwood Expedition". Arnoldia 58, n.º 4 (1998): 35–39. http://dx.doi.org/10.5962/p.251362.

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Glogov, Plamen y Gergana Zaemdzhikova. "CHARACTERISTICS OF METASEQUOIA GLYPTOSTROBOIDES ARTIFICIAL COMMUNITY КОKАLУАNЕ VILLAGE, SOFIA REGION". Ecological Engineering and Environment Protection 2022, n.º 1/2022 (30 de abril de 2022): 56–61. http://dx.doi.org/10.32006/eeep.2022.1.5661.

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The aim of the present study is phytocoenological characteristics and preliminary assessment of the health status of the first Dawn redwood (Metasequoia glyptostroboides) artificial plantation in Bulgaria established in 1969. The plantation of metasequoia is located in the land of the Kokalyane village (Sofia region) on an area of about 2500 m2. The study was conducted in the period April-July, 2021. The results show that the artificial stand was created on the locality of indigenous communities of Alnus glutinosa, which occupy the main part of the Iskar river banks between Plana and Lozenska mountains. The health status of the Dawn redwood plantation was assessed as “good”. From the distance of the 50-year period, the artificial afforestation with this exotic relic in the area of the village of Kokalyane can be considered successful.

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Chung, Yeong-Jin y Eui Jin. "Assessment of the Fire Risk Index and Fire Risk Rating of Five Wood Species According to Chung’s Equation-XII". Fire Science and Engineering 37, n.º 6 (31 de diciembre de 2023): 116–25. http://dx.doi.org/10.7731/kifse.2f976c20.

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Chung's equations-X, -XII, and -XII were applied to evaluate the fire risk index (FRI) and fire risk rating (FRR) of five wood species. The test specimens used were ginkgo tree, dawn redwood tree, toona tree, lime tree, and walnut tree. A cone calorimeter (ISO 5660-1) was selected and used to test the combustion characteristics of the specimens. The fire performance index-X (FPI-X) and fire growth index-X (FGI-X) calculated using Chung’s equations ranged from 560.59 to 2689.89 s<sup>2</sup>/kW and from 0.0005 to 0.0016 kW/s<sup>2</sup>, respectively. Furthermore, the FPI-XI and FGI-XI varied from 0.49 to 2.35 and from 1.67 to 5.33, respectively. FRI-XII, a FRR, showed that the fire risks of dawn redwood tree and ginkgo tree, at 10.88 (FRR: F) and 10.25 (FRR: F), respectively, were very high. In conclusion, a high FRI-XII value indicates that FPI-X and FPI-XI are low whereas FGI-X and FGI-XI are high.

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Fekry, R., W. Yao, A. Sani-Mohammed y D. Amr. "INDIVIDUAL TREE SEGMENTATION FROM BLS DATA BASED ON GRAPH AUTOENCODER". ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences X-1/W1-2023 (5 de diciembre de 2023): 547–53. http://dx.doi.org/10.5194/isprs-annals-x-1-w1-2023-547-2023.

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Abstract. In the last two decades, Light detection and ranging (LiDAR) has been widely employed in forestry applications. Individual tree segmentation is essential to forest management because it is a prerequisite to tree reconstruction and biomass estimation. This paper introduces a general framework to extract individual trees from the LiDAR point cloud based on a graph link prediction problem. First, an undirected graph is generated from the point cloud based on K-nearest neighbors (KNN). Then, this graph is used to train a convolutional autoencoder that extracts the node embeddings to reconstruct the graph. Finally, the individual trees are defined by the separate sets of connected nodes of the reconstructed graph. A key advantage of the proposed method is that no further knowledge about tree or forest structure is required. Seven sample plots from a plantation forest with poplar and dawn redwood species have been employed in the experiments. Though the precision of the experimental results is up to 95 % for poplar species and 92 % for dawn redwood trees, the method still requires more investigations on natural forest types with mixed tree species.

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Gao, Sha, Zhengnan Zhang y Lin Cao. "Individual Tree Structural Parameter Extraction and Volume Table Creation Based on Near-Field LiDAR Data: A Case Study in a Subtropical Planted Forest". Sensors 21, n.º 23 (6 de diciembre de 2021): 8162. http://dx.doi.org/10.3390/s21238162.

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Individual tree structural parameters are vital for precision silviculture in planted forests. This study used near-field LiDAR (light detection and ranging) data (i.e., unmanned aerial vehicle laser scanning (ULS) and ground backpack laser scanning (BLS)) to extract individual tree structural parameters and fit volume models in subtropical planted forests in southeastern China. To do this, firstly, the tree height was acquired from ULS data and the diameter at breast height (DBH) was acquired from BLS data by using individual tree segmentation algorithms. Secondly, point clouds of the complete forest canopy were obtained through the combination of ULS and BLS data. Finally, five tree taper models were fitted using the LiDAR-extracted structural parameters of each tree, and then the optimal taper model was selected. Moreover, standard volume models were used to calculate the stand volume; then, standing timber volume tables were created for dawn redwood and poplar. The extraction of individual tree structural parameters exhibited good performance. The volume model had a good performance in calculating the standing volume for dawn redwood and poplar. Our results demonstrate that near-field LiDAR has a strong capability of extracting tree structural parameters and creating volume tables for subtropical planted forests.

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Cao, Lin, Hao Liu, Xiaoyao Fu, Zhengnan Zhang, Xin Shen y Honghua Ruan. "Comparison of UAV LiDAR and Digital Aerial Photogrammetry Point Clouds for Estimating Forest Structural Attributes in Subtropical Planted Forests". Forests 10, n.º 2 (10 de febrero de 2019): 145. http://dx.doi.org/10.3390/f10020145.

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Estimating forest structural attributes of planted forests plays a key role in managing forest resources, monitoring carbon stocks, and mitigating climate change. High-resolution and low-cost remote-sensing data are increasingly available to measure three-dimensional (3D) canopy structure and model forest structural attributes. In this study, we compared two suites of point cloud metrics and the accuracies of predictive models of forest structural attributes using unmanned aerial vehicle (UAV) light detection and ranging (LiDAR) and digital aerial photogrammetry (DAP) data, in a subtropical coastal planted forest of East China. A comparison between UAV-LiDAR and UAV-DAP metrics was performed across plots among different tree species, heights, and stem densities. The results showed that a higher similarity between the UAV-LiDAR and UAV-DAP metrics appeared in the dawn redwood plots with greater height and lower stem density. The comparison between the UAV-LiDAR and DAP metrics showed that the metrics of the upper percentiles (r for dawn redwood = 0.95–0.96, poplar = 0.94–0.95) showed a stronger correlation than the lower percentiles (r = 0.92–0.93, 0.90–0.92), whereas the metrics of upper canopy return density (r = 0.21–0.24, 0.14–0.15) showed a weaker correlation than those of lower canopy return density (r = 0.32–0.68, 0.31–0.52). The Weibull α parameter indicated a higher correlation (r = 0.70–0.72) than that of the Weibull β parameter (r = 0.07–0.60) for both dawn redwood and poplar plots. The accuracies of UAV-LiDAR (adjusted (Adj)R2 = 0.58–0.91, relative root-mean-square error (rRMSE) = 9.03%–24.29%) predicted forest structural attributes were higher than UAV-DAP (Adj-R2 = 0.52–0.83, rRMSE = 12.20%–25.84%). In addition, by comparing the forest structural attributes between UAV-LiDAR and UAV-DAP predictive models, the greatest difference was found for volume (△Adj-R2 = 0.09, △rRMSE = 4.20%), whereas the lowest difference was for basal area (△Adj-R2 = 0.03, △rRMSE = 0.86%). This study proved that the UAV-DAP data are useful and comparable to LiDAR for forest inventory and sustainable forest management in planted forests, by providing accurate estimations of forest structural attributes.

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Payton, Greg. "Conserving the Dawn Redwood: The Ex Situ Collection at the Dawes Arboretum". Arnoldia 68, n.º 1 (2010): 26–33. http://dx.doi.org/10.5962/p.251543.

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Ahuja, M. Raj. "Origin and genetic nature of polyploidy in paleoendemic coast redwood (Sequoia sempervirens (D. Don) Endl.)". Silvae Genetica 71, n.º 1 (1 de enero de 2022): 54–65. http://dx.doi.org/10.2478/sg-2022-0007.

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Abstract It is not known when the polyploid coast redwood (Sequoia sempervirens) evolved from its diploid ancestors, and what is its type of polyploidy. Whether close relatives of Sequoia, giant sequoia (Sequoiadendron giganteum) and dawn redwood (Metasequoia glyptostroboides), have possibly contributed to the ancestry of hexaploid of Sequoia remains an open question. The nature of hexaploidy in Sequoia has baffled biologists for more than a century. Based on the chromosome configurations in Sequoia, G. Ledyard Stebbins was the first geneticists who postulated in 1948 that Sequoia is an autoallohexaploid (AAAABB), and an ancient species of Metasequoia might have been one of the putative ancestors of Sequoia. After its chromosome number (2n=6x=66) was confirmed in hexaploid Sequoia, the type of polyploidy in Sequoia has been further investigated for the past 70 years by a number of investigators, using cytogenetic and genetic data. Although an autoallohexaploid (AAAABB) origin of Sequoia has remained one of the dominant hypotheses until recently, an alternative hypothesis, amongst other possible origins, was also put forth by Ahuja and Neale (2002), that Sequoia may be partially diploidized autohexaploid (AAAAAA), derived from some ancestral species of Sequoia, thus carrying a single ancestral genome. Cytogenetic, molecular genetics, and genome sequence data now support the hypothesis that Sequoia originated as an autohexaploid.

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Zhang, Yuheng. "‘The Panda of Plants’: The Discovery of Dawn Redwood and National Identity Construction in Modern China". International Journal for History, Culture and Modernity 7, n.º 1 (2 de noviembre de 2019): 271–300. http://dx.doi.org/10.18352/hcm.557.

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This article analyzes the role played by the 1940s discovery of dawn redwood (Shuishan , Metasequoia glyptostroboides) in the construction of a modern Chinese national identity, as manifested in Chinese intellectual and popular discourse from the second half of the twentieth century to the present day. As the shuishan was transformed from a distinct biological species into an iconic national species, modern China as an ‘imagined community’ was forged in three dimensions. Spatially, the emerging national space was anchored in the world of nations; the temporal scale was redefined, and Chinese history projected back into deep time; and through the attribution of moral qualities to the tree, the ressentiment arising from the late development of nationalism was reaffirmed but also countered.

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Más fuentes

Libros sobre el tema "Dawn redwood"

Gittlen, William. Discovered alive: The story of the Chinese redwood. Berkeley, Calif: Pierside Publications, 1998.

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Conn) International Symposium on Metasequoia and Associated Plants (2nd 2006 New Haven. Metasequoia : back from the brink? An update: Proceedings of the Second International Symposium on Metasequoia and Associated Plants, August 6 - 10, 2006. New Haven, CT: Yale University, Peabody Museum of Natural History, 2007.

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Gittlen, William y William B. Gittlen. Discovered Alive: The Story of the Chinese Redwood. Pierside Publishing, 1999.

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Akins, Art y Kris Akins. Dawn Redwood Tree in a Box. Tree In A Box, 1994.

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Capítulos de libros sobre el tema "Dawn redwood"

"Dawn Redwood Trees". En Deep Alberta, 46–48. University of Alberta Press, 2007. http://dx.doi.org/10.1515/9780888648518-026.

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Love*, Renee L., Lindsay MacKenzie* y Ian Spendlove*. "Uncovering a Miocene forest in ancient Lake Clarkia and beyond". En Proterozoic Nuna to Pleistocene Megafloods: Sharing Geology of the Inland Northwest, 123–38. Geological Society of America, 2024. http://dx.doi.org/10.1130/2024.0069(06).

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ABSTRACT The middle Miocene Clarkia Fossil Beds of northern Idaho, USA, is a world-renowned exceptional fossil deposit (Fossil-Lagerstätte). These ancient lake deposits contain fossils showing exceptional preservation of original plant material, insects, and fish, including organelles and possible ancient DNA, and their stable isotope signatures. Yang et al. (1995) determined the upper age of the lake deposits to be 15.78 ± 0.039 Ma during peak outflows of the Priest Rapids Member of the Wanapum Basalt of the Columbia River Basalt Group, part of Earth’s youngest large igneous province of continental flood basalts. The deposits capture a time in Earth’s history that represents our most recent major thermal optima, the Miocene Climatic Optimum, before the general decline in temperatures to the modern day. Nearby fossil sites, including the Oviatt Creek Fossil Beds and the Juliaetta Fossil Beds, record the persistence of the climatic optimum and subsequent cooling. Conifers include Metasequoia (dawn redwood), Taxodium (bald cypress), Amentotaxus (Chinese yew), and Cunninghamia (Chinese fir). Angiosperm dicotyledon species also represent a much warmer climate than present day, including Cercidiphyllum (katsura), Zenia (Chinese legume), Zelkova (elm family), Magnolia (magnolia), Persea (avocado/bay family), Zizyphoides (buckthorn family), and Smilax (greenbriar). Estimates of the mean annual temperature from these fossil leaves range from 12° to 13 °C (53° to 55 °F). Mean annual precipitation values range from 200 to 216 cm/year with much higher humidity compared to today. Modern mean annual temperatures in northern Idaho are ~7 °C (47 °F), much cooler than Miocene temperatures. Today’s mean annual precipitation is estimated at ~80 cm/year. After the Miocene, many plant species representing mixed mesophytic broad-leaved forests started to disappear from the fossil record in North America and were thought to be extinct, only to be rediscovered in East Asia in more recent times (Cercidiphyllum, Cunninghamia, Metasequoia). This field trip will explore the Clarkia Fossil Beds and nearby fossil sites to examine the geology associated with the ancient lake and its fossils.

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Levy, Sharon. "Tides of Change". En The Marsh Builders. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190246402.003.0006.

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When Dan Hauser and his friend Wesley Chesbro won the Arcata city council race, their opponents did not concede gracefully. “I’m not a poor loser,” claimed Clyde Johnson, just before he called Hauser and Chesbro “rangatangs.” Then Johnson and the other disappointed candidates accused the winners of using dirty campaign tricks—just like President Nixon. Arcata’s weekly paper, the Union, ran the details of the post-election flap on its front page. That March of 1974, the national obsession with the Watergate scandal reached its peak. The president’s closest aides were on trial for burglary, wiretapping, and obstruction of justice. Nixon had become an international symbol of corruption, and the polls showed his public approval rating plummeting to an all-time low. So while Hauser and Chesbro could laugh off the comparison to an ape, when they were likened to the president the insult cut deep. It was a rough time to start a political career, especially in Arcata, an old logging town on the shores of Humboldt Bay in California’s damp northwest corner. The community was splitting in two like a redwood slat struck with an ax. On one side stood ranchers and timber workers, many of them descendants of the first pioneers to settle here in the 1850s. On the other were outsiders like Hauser and Chesbro, people who’d recently migrated to town to study or teach at Humboldt State University (HSU), and who’d decided to stay in this foggy enclave, 250 miles north of San Francisco. Now, for the first time, the outsiders controlled the city council. The old-time Arcatans felt like victims of an alien invasion. That feeling intensified when the national fad for high-speed nudity reached HSU. A few days after the election, four young guys ran naked through the University quad. Behind them, the crowns of the redwood trees at the edge of campus vanished into the fog. A cold rain fell as the earnest exhibitionists moved across the lawn, and goosebumps rose all over their bodies.

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Actas de conferencias sobre el tema "Dawn redwood"

Turner, Joshua, Qin Leng, Kevin Burke, Li Wang y Hong Yang. "CRITICAL PALEOBIOLOGICAL DATA FOR THE CONSERVATION OF ENDANGERED SPECIES: DAWN REDWOOD AS AN EXAMPLE". En GSA Connects 2022 meeting in Denver, Colorado. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022am-381638.

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