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Growth of Araucaria angustifolia in the Embrapa/Epagri forest reserve, Ca ador, SC, Brazil Crescimento de Araucaria angustifolia na Reserva Florestal Embrapa/ Epagri, Ca ador, SC
Patricia Póvoa de Mattos,Andreia Taborda dos Santos,Hugo Rivera,Yeda Maria Malheiros de Oliveira
Pesquisa Florestal Brasileira , 2010, DOI: 10.4336/2012.pfb.55.107
Abstract: Araucaria Forest is one of most threatened phyto-physiognomies in the Atlantic Forest domain, presenting great ecological-economical importance. Nevertheless, there are still lacks of knowledge concerning growth and dynamic of important species, as Araucaria angustifolia. The objective of this work was to recover the past growth of Araucaria angustifolia, native from Ca ador, SC, Brazil, by measuring growth rings and to estimate the average periodic diametric increment. The growth rings were counted and measured, using a stereoscope microscope, in increment cores of 0.5 cm collected from 32 adult trees. The measurements were done with LINTAB measuring table, with 0.01 mm of precision. The samples sizes were irregular, varying from 4.2 to 20.2 cm long. The trees presented average diameter breast height (DBH) of 76.3 cm, varying from 10.7 to 141.3 cm. The periodic diameter increment from the last 10 years was 0.4 cm, varying from 0.11 to 1.15 cm. It was observed differences among trees, but there was a tendency of reduction of growth rhythm in larger trees, being more evident in trees with more than 110 cm of DBH. A Floresta Ombrófila Mista (FOM) é uma das fitofisionomias mais amea adas da área de domínio da Mata Atlantica, apresentando grande importancia ecológico-econ mica. Apesar disso, ainda existem lacunas de conhecimento sobre a produtividade primária, o crescimento e a dinamica de espécies importantes, como a Araucaria angustifolia. O presente trabalho tem por objetivo estudar o crescimento anual de Araucaria angustifolia, nativa do Município de Ca ador, SC, pela medi o dos anéis de crescimento. A contagem e medi o dos anéis de crescimento foram feitas com o auxílio de um microscópio estereoscópico, em baguetas de 0,5 cm de diametro, coletadas de 32 árvores adultas. As medi es foram feitas com o medidor de anéis de crescimento LINTAB, com precis o de 0,01 mm. O comprimento das amostras é irregular, tendo variado de 4,2 cm a 20,2 cm. As árvores apresentaram diametro médio de 76,3 cm, variando de 10,7 cm a 141,3 cm. O incremento diamétrico periódico dos últimos 10 anos foi de 0,40 cm, variando de 0,11 cm a 1,15 cm. Observou-se varia o de crescimento entre os diferentes indivíduos, mas houve uma tendência de redu o do ritmo de crescimento nas árvores maiores, sendo mais evidente em árvores com mais 110 cm de diametro.
ESTRUTURA POPULACIONAL DE Ocotea porosa (LAURACEAE) EM UMA FLORESTA OMBRóFILA MISTA, EM CA ADOR (SC)
Silvana Lucia Caldato,Solon Jonas Longhi,Paulo Alfonso Floss
Ciência Florestal , 1999,
Abstract: O presente trabalho objetivou estudar a estrutura populacional de Ocotea porosa (Nees) L. Barroso na Floresta Ombrófila Mista, localizada na Reserva Florestal de Ca ador em Santa Catarina. Utilizou-se o método de unidades amostrais em forma de conglomerado, composto por 4 subunidades (20 x 500 m) distribuídas nas quatro dire es cardeais. No total, 8 subunidades foram instaladas, compondo dois conglomerados e somando 8 ha de área amostral. A linha central no sentido do comprimento das subunidades foi demarcada a cada 20 metros, com uma estaca permanente, desta forma, cada subunidade ficou dividida em 50 parcelas de 10 x 20 m, perfazendo um total de 400 parcelas de 200 m2. Em cada parcela, todos os indivíduos de O. porosa de tamanho igual ou maior a 10 cm de altura foram notificados, medindo-se o diametro do caule e/ou altura. Os resultados mostraram um predomínio de fases juvenis e diametros intermediários na estrutura populacional.
Alguns aspectos epidemiológicos da mancha bacteriana (Xanthomonas spp.) do tomateiro na regi?o de Ca?ador/SC
Marcuzzo, Leandro Luiz;Becker, Walter Ferreira;Fernandes, José Mauricio Cunha;
Summa Phytopathologica , 2009, DOI: 10.1590/S0100-54052009000200009
Abstract: aiming to explore some epidemiological aspects of bacterial spot of tomato incited by xanthomonas spp., a field experiment was carried out in ca?ador, sc. tomato plants were inoculated with a bacterial suspension before transplanting. at seven-day intervals the bacterial population on leaf surface and disease severity were monitored during 19 weeks. daily weather records were registered during the crop season. it was observed that epidemic onset coincided with physiological maturation of the first fruit clusters. leaves were symptomless until 77 days before harvest. it was observed that even under a dry period the bacterial leaf spot continued to develop. it is possible that the leaf wetness from dew deposits favored disease development. weather records showed an average of 13 hours with relative humidity e"90%. the bacterial population on leaf surface varied during the first 10 weeks after planting, according to the weather conditions, however, it remained stable after the fists symptoms of the disease. the disease curve progress was fitted to the logistic model y = 0,99964/(1+exp (10.35989-0.69762*x)), where y is disease severity and x the time in days. disease severity on fruits was high, reaching 30.22%, with total productivity of 117.88 ton.ha-1. the results will be used to estimate disease onset in a forecast system.
épocas de consórcio de alho com cenoura em três sistemas de manejo de plantas daninhas, em Ca?ador-SC
Mueller, S.;Durigan, J.C.;Kreuz, C.L.;Banzatto, D.A.;
Planta Daninha , 2004, DOI: 10.1590/S0100-83582004000400004
Abstract: this work was carried out to evaluate the effect of garlic (allium sativum) and carrot (daucus carota) intercropping at four carrot sowing times under three weed control systems on weed control, yield, profitability and commercial quality, in ca?ador-sc - brazil. four carrot seeding times (0, 15, 30 and 45 days after planting garlic) and three weed management systems (with herbicide, frequent manual weeding and no weed control) were tested. the experimental design was a randomized block with split-plots and four replications, with carrot seeding times being the plots and the weed management systems, the sub-plots. the herbicide oxadiazon at 750 g ha-1 did not cause toxicity in the garlic, nor in the carrot plants. garlic-carrot intercropping profitability was greater than that of garlic monoculture, mainly under frequent manual weeding.
Valida??o dos sistemas de alerta Machardy e Colpam 40? para previs?o da requeima do tomateiro em Ca?ador, SC
Becker, Walter Ferreira;
Summa Phytopathologica , 2010, DOI: 10.1590/S0100-54052010000300004
Abstract: two warning systems for late blight in tomato were evaluated in two growing seasons in ca?ador municipality, santa catarina state (sc), brazil. in the first growing season, as warming for fungicide spraying in late blight control, the systems machardy (modified) and olpam 40? were compared to the conventional method based on the calendar in the hybrid 'carmen' and the cultivar 'santa clara'. both warning systems led to 34.6% and 42.3% reduction, respectively, in fungicide spraying, relative to the conventional method. the hybrid carmen had higher productivity than 'santa clara'; however, there was no significant difference between the warning systems and the conventional method for the same cultivar. there was no significantdifference between the conventional method and colpan 40? concerning late blight control for the hybrid 'carmen'. in the second growing season, only the hybrid 'carmen' was used to compare both warning systems with the conventional method, and colpan 40? was evaluated at two severity levels (8 and 10). there was no significant difference in the productivity among treatments. as regards spraying frequency there was a decrease by 42.8% and 60.7% for the levels 8 and 10, respectively, with colpan 40? and by 39.2% with machardy system relative to the conventional method. treatments were not significantly different regarding late blight, except for the highest severity level with colpan 40 ? in which the disease intensity was higher. this work demonstrated the feasibility of both warning systems for late blight control in the region of ca?ador municipality.
ESTUDO DA REGENERA O NATURAL, BANCO DE SEMENTES E CHUVA DE SEMENTES NA RESERVA GENéTICA FLORESTAL DE CA ADOR, SC
Silvana Lucia Caldato,Paulo Alfonso Floss,Dorli Mário Da Croce,Solon Jonas Longhi
Ciência Florestal , 1996,
Abstract: Este estudo foi realizado na Reserva Genética Florestal de Ca ador, no Estado de Santa Catarina no período de agosto de 1995 a janeiro de 1996. Para o estudo da regenera o natural foram instaladas 10 parcelas de 250 m2 (10m x 25m). No interior das mesmas foram coletados a camada de solo juntamente com a serapilheira em até 3cm de profundidade em 40 pontos amostrais de 0,5m x 0,5m para a análise do banco de sementes no solo, e instalados 20 coletores com área de 0,5 m x 0,5 m para a avalia o da chuva de sementes. Os resultados mostram que apesar da Araucaria angustifolia ser a espécie dominante no estrato superior da floresta n o apresenta indivíduos na regenera o natural e a Mimosa scabrella foi a espécie arbórea mais importante presente no banco de sementes no solo. As rela es entre os três parametros avaliados evidenciam uma distribui o irregular das espécies na área de estudo.
AGENTES LIMITANTES à IMPLANTA O DE Pinus taeda L. POR SEMEADURA DIRETA
Vilmar Luciano Mattei
Ciência Florestal , 2013,
Abstract: Este trabalho analisa a possibilidade de implanta o de povoamentos de Pinus taeda por semeadura direta, combinando 4 épocas de semeadura; 3 técnicas de preparo de solo e 2 sistemas de implanta o, utilizando 5 sementes por ponto de semeadura. No campo foram analisados os danos causados por agentes bióticos e n o bióticos e o número de pontos com pelo menos uma planta. A análise dos resultados permitiu determinar que os pássaros foram os principais destruidores de sementes, principalmente na fase inicial de emergência. As formigas constituem-se em pragas de alto risco para a semeadura direta da espécie. A utiliza o de protetores foi indispensável para a semeadura direta de Pinus taeda. O outono foi a melhor época de semeadura.
Densidade e tamanho de formigueiros de Acromyrmex crassispinus em plantios de Pinus taeda
Nickele, Mariane Aparecida;Reis Filho, Wilson;Oliveira, Edilson Batista de;Iede, Edson Tadeu;
Pesquisa Agropecuária Brasileira , 2009, DOI: 10.1590/S0100-204X2009000400003
Abstract: the objective of this work was to evaluate the density and size of acromyrmex crassispinus nests in pinus taeda plantations along the year. the experiments were carried out in rio negrinho and três barras, sc, brazil, in p. taeda plantations of different ages (recently planted and three and six years old). three plots of one hectare were delimited in each treatment. the nests were classified according to three size classes: class i, up to 30 cm diameter; class ii, 31 up to 60 cm; class iii, above 61 cm. the density of a. crassispinus nests was low in recently planted areas, nearly twofold in three year-old plantations, and it reduced when the forest was six years old. the greatest nest density occurred in the period from december to april. the nests size increased along with the age of the p. taeda plantations.
Pinus taeda AND Pinus oocarpa PLYWOOD MANUFACTURING WITH FENOL-FORMALDHEYDE RESIN
Setsuo Iwakiri,Claudio S. Del Menezzi,Christine Laroca,Ivan Venson
CERNE , 2002,
Abstract: The objective of this study was to evaluate the quality of the plywood, manufactured from Pinus taeda and Pinus oocarpa, with 20 and 24 years old respectively, using three differentformulations of the fenol-formaldheyde resin. The results of the glue line shearing tests not showed statistical differences between the species and three resin formulations. In the hot water test, all of the boards were classified as “BR” and, the boards of the Pinus oocarpa produced with formulations (1)and (3), were classified as “WBP”. The different resin formulations not influenced on the modulus ofelasticity (MOE) and modulus of rupture (MOR) The boards of Pinus taeda with formulations (1) and(2) showed higher values of MOE in comparison of the Pinus oocarpa. The MOR of the Pinus oocarpa withformulation (2) was higher than Pinus taeda. The mechanical properties of the plywood wereprobably influenced by wood variability related to sapwood and hartwood, thickness of growth ringsand, springwood and summerwood.
DEFORMA ES RADICULARES EM PLANTAS DE Pinus taeda L. PRODUZIDAS EM TUBETES QUANDO COMPARADAS COM PLANTAS ORIGINADAS POR SEMEADURA DIRETA
Vilmar Luciano Mattei
Ciência Florestal , 2013,
Abstract: O trabalho analisa a implanta o de povoamentos de Pinus taeda L. por semeadura direta, procurando observar a estrutura o radicular das plantas, comparando-as com mudas de mesma idade produzidas em tubetes. Os resultados mostraram que o sistema radicular das plantas originadas no local apresentou-se bem distribuido horizontalmente e sem deforma es, enquanto aquele originado de mudas produzidas em tubetes, além de apresentar distribui o horizontal deficiente, apresentou uma série de deforma es morfológicas, que poder o comprometer o crescimento da futura árvore.
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