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| Registros recuperados: 70 | |
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| Birje, J; Verlaque, M; Poydenot, F. |
| In 1990, a study of the phytobenthos of the rocky intertidal platforms in the Safi-Essaouira region (Sidi Boulbra, Western Morocco) was carried out at three sites. The intertidal zonation was analysed along permanent transects, and a qualitative and quantitative study of two characteristic units of the eulittoral vegetation - the vegetation belt of Fucus spiralis and the communities of Florideophyceae - was made. One hundred and twenty-nine macroalgal taxa and three phases were listed: 19 Ulvophyceae, 19 Fucophyceae, 1 Bangiophyceae and 93 Florideophyceae. The intertidal communities of the area are typical of semi-exposed and unpolluted platforms of Western Morocco, in the eulittoral zone, most of the typical Fucales that occur along the NE Atlantic coasts... |
| Tipo: Text |
Palavras-chave: Macroalgae; Phytosociology; Intertidal zone; Western Morocco; Atlantic. |
| Ano: 1996 |
URL: http://archimer.ifremer.fr/doc/00096/20726/18363.pdf |
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| Simons, E.L.A.N.; Jansen, M.G.M.. |
| Lindernia dubia (L.) Pennell, a North American species, is still a rare and ephemerical neophyte in the Netherlands, but is invading the country rapidly now. We expect it to become a threat to plant biodiversity in Dutch wetlands. To describe its ecological and phytosociological position and assess its possible risk status we investigated known sites in the Netherlands. Being a pioneer species on open, muddy soil, more or less rich in nutrients, more or less acid, it occurs in different phytosociological classes: Littorelletea uniflorae, Phragmitetea, Isoeto-Nanojuncetea and Bidentetea tripartitae. We consider the species as possibly harmfull to vegetations belonging to the Littorelletea uniflorae and some associations of the Isoeto-Nanojuncetea, as those... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Lindernia dubia; Invasive alien species; Phytosociology; Wetlands; Littorelletea uniflorae; Isoeto-Nanojuncetea; Bidentetea tripartitae. |
| Ano: 2018 |
URL: http://www.repository.naturalis.nl/record/650112 |
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| Arruda, Daniel Meira; Batista, Márcio Luiz; Simão, Marcos Vinicius Ribeiro de Castro; Duque-Brasil, Reinaldo; Ferreira-Júnior, Walnir Gomes; Schaefer, Carlos Ernesto Gonçalves Reynald. |
| The dry forests, widely distributed in Brazil, are formations subject to different sampling method. Consequently, the data generated may affect the comparison among other vegetation formations. Therefore, this study presents and discusses changes caused by sampling vegetation using circumference at soil height (CSH) ≥ 10 cm and circumference at breast height (CBH) ≥ 15 cm. Different criteria provide an ambiguous vision of a same forest fragment, resulting in different structure and species richness. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phytosociology; Sampling methodology; Seasonally Tropical Dry Forest; Arboreal Caatinga Fitossociologia Fitossociologia; Métodos de amostragem; Mata Seca; Caatinga Arbórea. |
| Ano: 2012 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/380 |
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| Miranda Neto, Aurino; Martins, Sebastião Venâncio; Silva, Kelly Almeida; Gleriani, José Marinaldo. |
| The objective of this study was to evaluate the natural regeneration, to characterize the syndromes of seed dispersal and successional classes, and the parameters of relative humidity, temperature and luminosity of a restored forest through planting, with 40 years old, in Viçosa, MG, Brazil. It was registered 33 families, 102 species plus one morphotype (vines) and 1,938 individuals, with high diversity (H '= 3.56) and low ecological dominance (J' = 0.77), higher percentage of early secondary successional category, at the species level (33.3%), and late secondary, level of individuals (37%) and predominance of the zoochorous dispersion. The layer of forest regeneration restored reached similar parameters to those found in natural semideciduous forests in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Forest restoration; Phytosociology; Understory Recursos Florestais; Engenharia Florestal; Restauração Florestal Fitossociologia; Restauração florestal; Sub-bosque. |
| Ano: 2012 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/369 |
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| NOLLA,A.; JUCKSH,I.; CASTALDO,J.H.; ALVARENGA,R.C.; ALBRECHT,L.P.. |
| ABSTRACT: The presence of weeds on fields is a concern for farmers, due to competition with the commercial crops, reducing yields. The intercropping of maize with legumes provides weed control; after senescence, the nutrients accumulated by plants are released, recycling nutrients. The study of plant species and their diversity is called phytosociology. This study aimed at evaluating the accumulation of dry phytomass by maize intercropped with legumes and weeds species, and at evaluating nutrient cycling and the phytosociology of weeds. The experiment consisted of maize intercropped with legumes cover crops: jack-beans, Brazilian jack-beans, velvet bean, lablab-beans, and pigeon pea, and the control treatment (maize without intercrop), all without chemical... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Green manure; Phytosociology; Jack beans; Modified importance value index; Velvet bean. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100290 |
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| Concenço,G.; Silva,C.J.; Tomazi,M.; Correia,I.V.T.; Souza,N.C.D.S.; Andres,A.. |
| This study aimed to evaluate different crops and plant species planted after soybeans for one year, in terms of their potential to inhibit the occurrence of weed species. The following crops that were planted as second crop after soybeans were evaluated: (1) corn (Zea mays) planted at spacing of 90 cm between rows, intercropped with Brachiaria ruziziensis in the inter-rows; (2) sunflower (Helianthus annuus); (3) crambe (Crambe abyssinica); (4) radish (Raphanus sativus); (5) rapeseed (Brassica napus); and (6) winter fallow - no plantation after soybeans. Phytosociological characterization of weed species was carried out at the pre-planting of soybeans in the following cropping season. Estimations of relative abundance, relative frequence, relative dominance... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Corn; Sunflower; Radish; Crambe; Rapeseed; Phytosociology. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000300007 |
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| Concenço,G; Ceccon,G; Schwerz,F; Fonseca,I.C; Leite,L.F. |
| Intercropping systems involving corn are often subjected to stress caused by weeds, which usually result in 30-70 per cent yield loss when no control practice is applied. This study aimed to assess the composition of weed communities due to soil coverage, at neighboring areas submitted to distinct soil managements. The soil was collected at field and the study was conducted under a greenhouse in three steps: (1) weeds composition and importance within each treatment; (2) comparison between treatments (distinct crop and intercropping managements); (3) infestation in the area as a whole. The weed composition in the short term is influenced by the management of the area, but this shift requires some more years to be reflected at the soil seed bank. Some weed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil coverage; Soil management; Phytosociology. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582011000400011 |
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| DEISS,L.; MORAES,A.; PELISSARI,A.; PORFÍRIO-DA-SILVA,V.; SCHUSTER,M.Z.. |
| ABSTRACT : Trees can modify the weed seed bank composition and distribution in the cropped area of an agroforestry system. This study aimed at analyzing the eucalyptus (Eucalyptus dunnii) effect on spatial distribution, functional traits abundance and weed seed bank botanic composition in an agroforestry system under no-tillage in Subtropical Brazil. The experiment was conducted in a randomized block design with five replications, and five positions between 4.5-year-old eucalyptus double rows [(4x3) x 20 m] as treatments. Soil sampling was performed at 0-20 cm and the method to quantify and identify seeds was the seedling emergence in trays, inside a greenhouse. Weed phytosociological indices (relative density, frequency and importance), functional traits... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Alley cropping; Phytosociology; Integrated weed management; Integrated crop-livestock systems; Functional traits; Spatial distribution patterns. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100222 |
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| MENDES,K.F.; GOULART,M.O.; INOUE,M.H.; MERTENS,T.B.; SILVA,I.P.. |
| ABSTRACT: Phytosociological studies are extremely important for the management of weeds in cultivated areas. Thus, the goal of this work was to evaluate the interference of mineral oil associated with oxyfluorfen and flumioxazin, through the phytosociological survey of weeds. Therefore, this experiment was conducted in a 2 x 5 + 1 factorial design and with four replications; the following oxyfluorfen + flumioxazin associations were evaluated: 240 + 50, 192 + 40, 144 + 30, 96 + 20 and 48 + 10 g a.i. ha-1, with and without the addition of mineral oil, including a control sample without application. Thirty days after the application, plant density, frequency and abundance of species were determined, and so were frequency, density and relative abundance, as... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phytosociology; Similarity index; Herbicide association; Adjuvants. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100230 |
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| ALBUQUERQUE,J.A.A.; SANTOS,T.S.; CASTRO,T.S.; MELO,V.F.; ROCHA,P.R.R.. |
| ABSTRACT The goal of this study was to evaluate the occurrence of weeds after soybean harvest in rotational systems of no-till and conventional tillage in the savannah of Roraima, Brazil. Two simultaneous experiments were conducted in adjacent areas, the first one with no-till soil management system and the second one with the conventional system, with crop rotations for five agricultural years: pearlmillet (2007/2008), soybean (2008/2009), maize (2009/2010), cowpea with maize (2010/2011), soybean (2011/2012) and maize (2012/2013). The used experimental design was the randomized block one with 28 plots, sized 3 x 15 m (45 m2) distributed in 4 blocks. In May 2010, the combined sowing of cowpea and maize was performed, and later, during the same month of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Phytosociology; Weeds; Savannah; Morphological characteristics. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100238 |
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| Concenço,G; Salton,J.C; Secretti,M.L; Mendes,P.B; Brevilieri,R.C; Galon,L. |
| This study aims to assess the composition of weed communities as a function of distinct selection factors, at neighboring areas submitted to distinct soil management and diverse use for sixteen years. Four areas submitted to distinct managements (conventional tillage system; no-till system; integration crop/livestock and continuous livestock) were sampled in relation to the occurrence and severity of weed species by the beginning of the planting season, being estimated the relative abundance, relative frequency and relative dominance of each weed species under each area, as well as the Importance Value Index for each species. Areas were also compared by the Sørensen's similarity coefficient. Areas where pasture and grazing were never present, exhibited a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Integration crop/livestock; Cropping systems; Phytosociology. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582011000300005 |
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| Concenço,G.; Silva,C.J.; Staut,L.A.; Pontes,C.S.; Laurindo,L.C.A.S.; Souza,N.C.D.S.. |
| In the Western Region of Brazil, it is usual to have two agricultural harvests in the same cropping season. Usually the first crop is soybean, followed by corn. In areas where corn is not planted due to a delayed harvest of soybean, farmers generally do not use winter crops. For these areas, the planting of winter oilseed crops aiming at the production of bio-fuels is one of the best alternatives; in addition, this would help in reducing the occurrence of weed species at the following summer crop. This study aimed to assessing the weed community in distinct winter crops post soybean crop, in terms of species composition, level of infestation and severity of occurrence. The following treatments were evaluated: agriculture under a no-till system with winter... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phytosociology; Oilseed crops; Infestation; Crambe abyssinica; Brassica napus; Raphanus sativus. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582012000400008 |
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| NUNES,F.S.; SCHAEDLER,C.E.; CHIAPINOTTO,D.M.. |
| ABSTRACT: The phytosociological method helps evaluate the vegetation composition. The objective of this study was to identify and quantify the main weed species present in irrigated rice. The phytosociological survey was carried out in three mainly rice monoculture, Clearfield® technology using properties in Itaqui-RS, between 2013 and 2014. For each property and period, a ½ ha representative area was selected and 10 random samples were collected, using a quadrat square of 1 m2. The sample colletion was conducted in two periods of time: during the irrigated rice crop initial growth and during the cereal’s pre-harvesting phase. All collected plants were identified and counted, allowing for their frequency, relative frequency, density, relative density,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phytosociology; Oryza sativa; Identification. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100245 |
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| LANZA,T.R.; MACHADO,A.F.L.; MARTELLETO,L.A.P.. |
| ABSTRACT The objective is to evaluate the effects of plant density in banana crops against weed suppression. Six treatments were used: 1,200 (3.33 x 2.5 m), 1,600 (2.5 x 2.5 m), 2,000 (2.0 x 2.5 m), 2,400 (1.67 x 2.5 m), 2,800 (1.43 x 2.5 m) and 3,200 (1.25 x 2.5 m) banana plants per hectare, arranged in an experimental design of randomized blocks with four replications. The phytosociological study of weed communities was carried out one month after transplanting and then every 90 days, totaling six samples in 16 months of cultivation, always those being held 15 days after mowing. With the data of dry mass and number of individuals per species Relative density (De.R) Relative frequency (Fr.R) Relative dominance (Do.R), importance value value (IVI) of weed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Banana crop; Phytosociology; Crop management. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100252 |
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| Registros recuperados: 70 | |
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