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| Registros recuperados: 16 | |
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| Gallardo-Cerda,Jorge; Bravo,León A; Corcuera,Luis J. |
| Nothofagus dombeyi (Mirb.) Blume is an evergreen tree, pioneer in habitats subject to unfavorable environmental conditions as nighttime freezing temperatures and low water content. It inhabits zones characterized by cold Winter with freezing temperature and Spring frosts reaching to -5°C. Furthermore, it has the capacity to maintain a functional photosynthetic apparatus at low temperatures. We postulated that N. dombeyi is capable to accumulate dehydrins in leaves in response to cold. Seasonal variation in dehydrins, soluble total proteins, and cryoprotective activity in vitro of protein extracts of N. dombeyi leaves were analyzed during the years 2004 and 2005. A dehydrin-like protein of 47-kDa was immunologically identified; this protein was present only... |
| Tipo: Journal article |
Palavras-chave: Evergreen; Tree; Old acclimation; Proteins. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432012000100002 |
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| VARELLA, A. C.; BARRO, R. S.; SILVA, J. L. S. da; PORFIRIO-DA-SILVA, V.; SAIBRO, J. C. de. |
| The cold zone of Brazil occupies approximately 6 % of the national territory and is located between latitudes 24° S and 33° S. In this area, extensive cattle and sheep farming systems and conventional cropping and forestry are predominant. With the end of government subsidies by the decade of 1980s, an increase in farming production costs, a decrease of native forest covering, an increase of degraded areas in agriculture and livestock farming systems and a mismatch between timber national supply and demand after 1990s, an opportunity arises for integrate forestry with livestock and agriculture activities in Brazil, particularly in the southern. This chapter initially reports key events over the last three decades that have supported the increasing interest... |
| Tipo: Capítulo em livro técnico (INFOTECA-E) |
Palavras-chave: Sistema silvipastoril; Sistema agroflorestal; Região Sul; Brasil; Tree; Southern Brazil; Planta Forrageira; Sombreamento; Agroforestry; Cattle; Sheep. |
| Ano: 2016 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1090865 |
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| Oliveira, Altamir Fernandes de; Alves Pereira, José Aldo; Coelho, Silvério José; Assis Pereira, Gabriel de. |
| This work aimed to present a partial diagnosis of street tree under power grid in five cities in the West Region of Minas Gerais, which had more power outages because of conflicts with trees. We identified 186 trees, belonging to 17 species of exotic origin and 30 species of native origin. The most frequent species were Poincianella pluviosa (30.43%), Ligustrum lucidum (10.86%), Michelia champaca (6.52%) and Schinus molle (4.89%), which together amounted to 52.7% of the assessed trees. Most trees (84.78%) were located in streets wider than 7 m, and 36.55% of the trees were planted in sidewalks with a minimum of 2 m wide. Those trees present ther first bifurcation at over 1.80 m above ground level. The pruning performed due to conflicts with the grid... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tree; Electrical wiring; Public administration; Diversity indices; Pruning Árvore; Fiação elétrica; Gestão pública; Índices de diversidade; Poda. |
| Ano: 2016 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/749 |
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| Müller,Caroline; Hodecker,Bárbara Elias Reis; Merchant,Andrew; Barros,Nairam Félix de. |
| Abstract Plant health and nutrition are strongly influenced by the availability of water. The objective of this study was to evaluate the different patterns of initial growth and nutritional efficiency of ten drought-stressed Eucalyptus clones. Water stress conditions were induced by osmotic stress, by gradual addition of polyethylene glycol 6000 over a 20-day period. Drought stress significantly reduced the dry matter of leaves, roots, and the whole plant as well as the nutritional efficiency of most clones. Clone PL040 was the least efficient in nutrient uptake and use and the most sensitive to drought stress. Interestingly, under drought stress, the drought-tolerant clones generally had high AE (absorption efficiency), but low nutrient UE (use... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tree; Growth; Nutrient use efficiency; Drought stress. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100531 |
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| Souza,Wander de; Barbosa,Orlando Rus; Marques,Jair de Araújo; Gasparino,Eliane; Cecato,Ulysses; Barbero,Leandro Martins. |
| It was aimed to verify the effect of the presence of trees and their heights in silvipastoral system on the intake behavior of Nellore heifers in the summer. Ten heifers for the following systems were used: system without shade, silvipastoral system with 8-meter and 18-meter trees. The data were collected in three days during 12 hours, subdivided in morning (7:15 a.m. to 1. p.m.) and afternoon (1:15 p.m. to 7 p.m.). It was evaluated the times and frequency of grazing, rumination, idle and the percentage of time that the animals remained in the shade; black globe-humidity index, whose average and minimum values (86 and 82) were equal for 8-meter tree system and 18-meter tree system; however they were lower when compared to the without shade system (89 and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ambience; Indle; Index; Rumination; Shade; Tree. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000300029 |
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| Massi,Klécia Gili; Franco,Augusto César. |
| ABSTRACT Cerrado tree species can survive fire by resprouting. Generally, large and less damaged plants produce new branches and leaves from stem buds (aerial), whereas small and highly injured individuals would resprout from the stem base or from underground organs (basal). We compared the three most common Cerrado woody plant species in a savanna area of the IBGE Ecological Reserve, Brasília, Brazil, aiming to verify if the resprouting strategy (aerial or basal) differed between species and if that was related to plant size. Guapira noxia had small-sized plants, a higher percentage of trunk charred and more individuals with basal resprouting, while Eriotheca pubescens had large-sized plants with a greater intensity of aerial resprouting, Basal... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cerrado; Disturbance; Fire; Resprout; Size; Tree. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000400693 |
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| SALOMÃO,NATÁLIA V.; MACHADO,EVANDRO L.M.; PEREIRA,RAFAELLA S.; FERNANDES,GERALDO W.; GONZAGA,ANNE P.D.; MUCIDA,DANIELLE P.; SILVA,LEOVANDES S. DA. |
| Abstract The theory of landscape ecology applied to the methods of spatial analysis helps to understand changes in the structure of forest remnants. In view of this theory, the objective of the present study was to analyze the structure of a fragmented area between the years 1979 and 2015 through calculation of landscape metrics for arboreal, shrubby and herbaceous vegetation classes. Vegetation classes were classified with visits to the field, interpretation of aerial photographs from 1979 and supervised classification of Landsat 8 from 2015. The metrics calculated for each class were area and total number of fragments, total edge and average connectivity among the fragments. The analysis of structure found that it changed negatively due to an increase in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Landscape; Ecology; Tree; Shrub; Herb; Metrics. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000703353 |
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| Registros recuperados: 16 | |
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