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Registros recuperados: 6
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Carbon dioxide-enriched atmosphere enhances biomass accumulation and meristem production in the pioneer shrub Baccharis dracunculifolia (Asteraceae) Acta Botanica
Mendes de Sá,Camila Emiliane; Negreiros,Daniel; Fernandes,Geraldo Wilson; Dias,Mariana Costa; Franco,Augusto César.
The increase in atmospheric CO2 concentration predicted to the end of this century may cause several alterations on plant species development, which shall result in changes in the structure and function of plant communities. The present work aimed to investigate the effects of the increase in atmospheric CO2 concentration on the development of Baccharis dracunculifolia, a key pioneer Neotropical shrub. Seedlings of B. dracunculifolia were exposed to 720 ppm of CO2 as well as to ambient concentration of CO2 (approximately 360 ppm) during 120 days in open top chambers. Growth and dry biomass accumulation were higher under elevated CO2 concentrations. As a response to CO2 enrichment, there was an increase of 134% in total dry mass, 208% in root dry mass and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Climate change; Elevated [CO2]; Plant growth; Pioneer species; Resource allocation.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000400021
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Germination of seeds of tropical pioneer species under controlled and natural conditions Rev. Bras. Bot.
VÁLIO,IVANY FERRAZ MARQUES; SCARPA,FABIANO MICHELETTO.
Seed germination of eight tropical pioneer species (Cecropia hololeuca, C. pachystachya, C. glazioui, Solanum gracillimum, S. granuloso-leprosum, S. tabacifolium, Croton floribundus and Miconia chamissois) was studied. In controlled conditions, alternating temperatures were tested from 5 to 25 °C. Low Red:Far Red ratios (R:FR) were also examined. In the field, germination was evaluated in gaps and under the canopy. With the exception of Croton floribundus, all other species were photoblastic in that higher germination percentages were found under light conditions (S. tabacifolium behaved as a negative photoblastic species at some temperatures). No relationship was found between germination percentage and alternating temperature. Germination was markedly...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pioneer species; Germination; Alternating temperatures; Gap and understory environments.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042001000100009
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Micorrización, crecimiento y contenido nutrimental de Pinus greggii y P. montezumae inoculados con tres hongos comestibles. Colegio de Postgraduados
Martínez Reyes, Magdalena.
Los hongos ectomicorrízicos promueven el crecimiento, la transferencia nutrimental y la supervivencia en campo de diversas especies vegetales de importancia forestal. Uno de los criterios de selección de los hongos ectomicorrízicos, actualmente utilizado es su comestibilidad. En el presente trabajo se estudió el efecto de la inoculación con esporomas deshidratados molidos, solos o combinados, de Laccaria laccata s.l., Hebeloma mesophaeum s.l. y Boletus edulis s.l., en Pinus greggii Engelm. y P. montezumae Lamb., coníferas ampliamente usadas para reforestación en México. Se evaluó el efecto de estos tres hongos en el peso seco de la parte aérea, raíz, altura, diámetro del tallo y contenido nutrimental (N, P, K, Ca y Mg) de las dos especies de pino. El peso...
Palavras-chave: Laccaria laccata; Hebeloma mesophaeum; Boletus edulis; Especies pioneras; Hongos comestibles silvestres; Pioneer species; Edible wild mushrooms; Doctorado; Edafología.
Ano: 2010 URL: http://hdl.handle.net/10521/281
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Reproductive phenology of Miconia mirabilis (Melastomataceae) within three distinct physiognomies of Atlantic Forest, Bahia, Brazil Biota Neotropica
Pessoa,Michaele de Souza; Vleeschouwer,Kristel Myriam De; Talora,Daniela Custódio; Rocha,Larissa; Amorim,André Márcio Araújo.
Although Miconia mirabilis is a very common species in disturbed forest areas and is known for providing food resources for the local fauna, little is known about its reproductive phenology and other ecological aspects. The present study compares intra- and inter-annual patterns in the reproductive phenophases of that species in three distinct physiognomies of Atlantic Forest in Southeastern Bahia based on semi-quantitative observations conducted over a period of three years. We searched for possiblerelationships with climatic variables, differences among sites and synchrony. Both the flowering and fruiting strategies of M. mirabilis were classified as annual extended in all three study sites. We found no significant differences among years. Despite low...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Flowering; Fruiting; Pioneer species; Secondary forest.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032012000200006
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Sistema de cruzamento de Trema micrantha (L.)B. em fragmentos florestais. Repositório Alice
RIBAS, L. A.; KAGEYAMA, P. Y..
A utilização dos princípios genéticos no manejo e conservação de espécies da floresta tropical requer detalhado conhecimento do modo de reprodução, sistema de cruzamento e estrutura genética nas populações das espécies de interesse. Trema micrantha é espécie pioneira típica, polinizada pelo vento e produz muitas sementes que são dispersas por animais. Seu sistema de cruzamento foi avaliado com base em 24 progênies com 10 indivíduos, obtidas de populações localizadas em dois fragmentos no Estado de São Paulo. Os parâmetros foram estimados a partir de 13 locos isoenzimáticos polimórficos, somando-se 30 alelos. T. micrantha apresenta sistema de cruzamento misto, com preferência por alogamia (tm de 0,966 e 0,819), e suas populações estão sujeitas a variações...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Espécie pioneira; Estrutura genética; Genetic structure; Estructura genética; Alogamy; Polinización cruzada; Reprodução vegetal; Cruzamento vegetal; Floresta tropical; Espécie nativa; Crindiúva; Trema micrantha; Variação genética; Alogamia; Endogamia; Tropical forests; Mating systems; Pioneer species; Inbreeding; Bosques tropicales; Sistemas de apareamiento; Especies pioneras.
Ano: 2006 URL: http://www.alice.cnptia.embrapa.br/handle/doc/506309
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The soil seed bank during Atlantic Forest regeneration in Southeast Brazil BJB
BAIDER,C.; TABARELLI,M.; MANTOVANI,W..
A survey was conducted to determine the density and species composition of viable seeds buried in four stands of a tropical montane forest at Parque Estadual Intervales, Brazil. The objective was to understand: (1) how numbers and composition of the soil seed bank change as the forest regrows, and (2) how such changes affect the species available for regeneration if forests of different ages are cut down. In each forest stand (5, 18, 27-yr-old and a mature forest), 57 soil samples were collected (0-2.5 and 2.5-5 cm deep). Viable seed density of herbaceous species ranged between 11,003 seeds. m-2 (5-yr-old vegetation) and 482 (mature forest), and between 25 (5-yr-old vegetation) and 389 seeds. m-2 (mature forest) for woody plant species in the 0-5 cm soil...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Atlantic Forest; Brazil; Forest regeneration; Pioneer species; Soil seed bank.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000100006
Registros recuperados: 6
Primeira ... 1 ... Última
 

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