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| Registros recuperados: 12 | |
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| Mattos, Patricia Póvoa de; Seitz, Rudi Arno; Salis, Suzana Maria de. |
| The information on the influence of environmental factors upon growth rate of trees is very important for the development of forestry management programs. The aim of this work was to determine the age and radial increments of the trees. Samples were collected, in July 1996, in Nhumirim Farm, Embrapa Pantanal, located in Nhecolândia sub-region, Pantanal, Corumbá - Mato Grosso do Sul. The disks from 19 trees species were collected in areas with Arboreous Savanna, Forested Savana and Semi-deciduous Dry Forest. The trees were selected by good canopy formation. Traversal section samples of the stem were collected of each tree at 0.3 m height, to determinate age and increment of the first five years of the trees, and at 1,30m height, to evaluate the growth... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dendrochronology; Tropical trees; Diameter increment; Growth rings Dendrocronologia; Árvores tropicais; Incremento diamétrico; Anéis de crescimento. |
| Ano: 2011 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/241 |
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| Andrade,Eva Santos de; Garcia,Silvana dos Santos Carvalho; Albernaz,Ana Luisa Kerti Mangabeira; Tomazello Fillho,Mario; Moutinho,Victor Hugo Pereira. |
| ABSTRACT: Euxylophora paraensis Huber - Rutaceae, popularly known as yellow heart, is a species with a low-density population that has suffered intense exploitation in recent decades. This has led to its inclusion in the IBAMA list of endangered species. This study aimed to evaluate the existence of growth rings and their annuity in five trees of Euxylophora paraensis through the x-ray microdensitometry technique, as well as to compare them using the classical method. Application feasibility of this technique can be deepened through future, broader dendroecological studies, which may better elucidate the understanding of the species population dynamics and promote more sustainable uses. Wood disks were collected from the base of five 29-year-old trees from... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dendrochronology; Yellow heart; Density; Amazon. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000400501 |
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| Lepofsky, Dana; Simon Fraser University; dlepofsk@sfu.ca; Heyerdahl, Emily K; USDA Forest Service; eheyerdahl@fs.fed.us; Lertzman, Ken; Simon Fraser University; lertzman@sfu.ca; Mierendorf, Bob; North Cascades National Park Service Complex; Bob_Mierendorf@nps.gov. |
| The recent encroachment of woody species threatening many western North American meadows has been attributed to diverse factors. We used a suite of methods in Chittenden Meadow, southwestern British Columbia, Canada, to identify the human, ecological, and physical factors responsible for its historical dynamics and current encroachment by woody vegetation. We evaluated three hypotheses about the origin and processes maintaining the meadow: the meadow is (1) of recent human origin; (2) of ancient human origin, maintained by aboriginal burning; and (3) of ancient non-human origin, not maintained by aboriginal burning. Our data supported the idea that the meadow had ancient non-human origins and its recent history and current status have resulted from... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Anthropogenic influence; Archaeology; British Columbia; Cascade Range; Chittenden Meadow; Climate change; Dendrochronology; Fire suppression; Historical dynamics; Meadows; Ponderosa pine; Tree encroachment. |
| Ano: 2003 |
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| Graells,Giorgia; Corcoran,Derek; Aravena,Juan Carlos. |
| BACKGROUND: Twenty beavers Castor canadensis (Castoridae) were initially introduced in the Argentinean portion of Tierra del Fuego Island, from where they have occupied most of the Fuegian Archipelago and even reached the continent. This invasion is causing great damage to the subantarctic forest ecosystems, and it is not known how fast the species is spreading. While there is an estimation of this advance using interviews, it is not known how reliable these are and they cannot be made in remote areas. On the mainland, where beavers were present, their date of arrival was estimated using interviews and dendrochronology, and the dates obtained by both methods were compared for each site. RESULTS: Differences were found among the groups of respondents,... |
| Tipo: Journal article |
Palavras-chave: Beaver; Dendrochronology; Dispersal; Cross dating; Surveys. |
| Ano: 2015 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2015000100003 |
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| HABERLE,S. G.; SZEICZ,J. M.; BENNETT,K. D.. |
| Palynological and geochemical analysis of late Holocene lake sediments and dendrochronological analysis of Pilgerodendron in a volcanically active region of southern Chile reveal the long-term impact of a series of tephra fall events and tectonic activity on lake sedimentation and local vegetation. An upper 0,75 m core overlaps with a 4,35 m long Livingstone piston core to give a 4,60 m long sediment record, extending back to 4800 yr BP. Geochemical data shows the shift from allogenic dominance to authigenic and biogenic dominance as waterlogged soils developed within the catchment. This is presumed to have occurred under the influence of continued addition of nutrients to the catchment from tephra deposition and the associated high sedimentation rates.... |
| Tipo: Journal article |
Palavras-chave: Hudson Volcano; Tephra; Pollen; Geochemistry; Dendrochronology. |
| Ano: 2000 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000400010 |
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| SOUZA,BRUNNA T.; ESTRADA,GUSTAVO C.D.; SOARES,MÁRIO L.G.; CALLADO,CÁTIA H.. |
| ABSTRACT The formation of annual growth rings has been confirmed for several mangrove species in the last decade, among which is the Rhizophora mangle. However, the record of annual rings for this species was made in a region with high hydric seasonality, a widely recognized induction factor of annual rings in tropical species. In this sense, the present study aimed to verify the occurrence of annual growth rings in R. mangle in the mangroves of Guaratiba (Rio de Janeiro, Southeastern Brazil), a region with low hydric seasonality. For this purpose, the crossdating technique was applied in ten trees collected with known age (seven years). The growth rings are characterized by alternating layers of low vessel density (earlywood) and high vessel density... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Growth rings; Dendrochronology; Mangrove; Dendroecology; Proxy. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000200517 |
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| Registros recuperados: 12 | |
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