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| Registros recuperados: 73 | |
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| Medeiros,Pedro H. A.; Araújo,José Carlos de; Andrello,Avacir C.. |
| Scarcity of long-term series of sediment-related variables has led watershed managers to apply mathematical models to simulate sediment fluxes. Due to the high efforts for installation and maintenance of sedimentological gauges, tracers have been pointed out as an alternative to validate soil redistribution modelling. In this study, the 137Cs technique was used to assess the WASA-SED model performance at the Benguê watershed (933 km²), in the Brazilian semiarid. Qualitatively, good agreement was found among the 137Cs technique and the WASA-SED model results. Nonetheless, quantitatively great differences, up to two orders of magnitude, were found between the two methods. Among the uncertainties inherent to the 137Cs technique, definition of the reference... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 137Cs; Soil redistribution; Sediment modelling; Semiarid. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000200004 |
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| Stolf,Rubismar; Piedade,Sonia M. de S; Silva,Jair R. da; Silva,Luiz C. F. da; Maniero,Miguel Â. |
| The transposition of the São Francisco River is considered one of the greatest engineering works in Brazil of all time since it will cross an extensive agricultural region of continental dimensions, involving environmental impacts, water, soil, irrigation, water payment and other multidisciplinary themes. Taking into account its importance, this subject was incorporated into a discipline of UFSCar (Federal University of São Carlos - Brazil) named "Pollution and Environmental Impacts". It was noted strong reaction against the project, even before the presentation. To allow a critical analysis, the first objective was to compile the main technical data and environmental impacts. The second objective was to detect the three most important aspects that cause... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Integration; Water transfer; Volume; Technical data; Northeast; Semiarid. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000600001 |
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| Furtado,Dermeval A.; Amancio,Daniele; Nascimento,José W. B. do; Gomes,Josivanda P.; Silva,Rafael C.. |
| The study was conducted in a facility for pigs during the nursery and finishing in the town of 'Montadas', in the semiarid of the state of Paraiba, Brazil, in the rainy and dry season, aiming to evaluate the concentration of oxygen, methane, carbon monoxide and ammonia, and the bioclimatic indexes: ambient temperature (AT), relative humidity (RH) and the index of black globe temperature and humidity (IBGTH). These indexes differed significantly (P>0.05) between the periods and times. The AT in the rainy season was in the thermal comfort zone(TCZ) in most of the times in the nursery; for the finishing phase, thermal discomfort occurred; during the dry season, there was thermal comfort in the nursery phase; in the finishing phase the thermal discomfort... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Welfare; Thermal comfort; Gases; Semiarid. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000100004 |
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| Leão,Raimundo A. de O.; Soares,Antônio A.; Teixeira,Adunias dos S.; Silva,Demetrius D. Da. |
| The state of Ceará, Brazil, has 75% of its area covered by Brazilian semiarid, with its peculiar features. In this state, the dams are constituted in water structure of strategic importance, ensuring, both in time and space, the development and supply of water to population. However, construction of reservoirs results in various impacts that should be carefully observed when deciding on their implementation. One of the impacts identified as negative is the increased evaporation, which constitutes a major component of water balance in reservoirs, especially in arid regions. Several methods for estimating evaporation have been proposed over time, many of them deriving from the Penman equation. This study evaluated six different methods for estimating... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dams; Semiarid; Hydrologycal modelling; Water balance. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000100014 |
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| Ribeiro,Leonardo B.; Freire,Eliza M. X.. |
| This study aimed to analyze the seasonal variation in diet composition and foraging behavior of Tropidurus hispidus (Spix, 1825) and T. semitaeniatus (Spix, 1825), as well as measurement of the foraging intensity (number of moves, time spent stationary, distance traveled and number of attacks on prey items) in a caatinga patch on the state of Rio Grande do Norte, Brazil. Hymenoptera/Formicidae and Isoptera predominated in the diet of both species during the dry season. Opportunistic predation on lepidopteran larvae, coleopteran larvae and adults, and orthopteran nymphs and adults occurred in the wet season; however, hymenopterans/Formicidae were the most important prey items. The number of food items was similar between lizard species in both seasons;... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Diet; Foraging strategies; Lizards; Semiarid; Sympatric species. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212011000200010 |
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| Farias Júnior, José Aminthas de; Arriel, Eder Ferreira; Lúcio, Assíria Maria Ferreira da Nóbrega; Freire, Antonio Lucineudo de Oliveira; dos Santos, Rivaldo Vital; Lucena, Rosivânia Jerônimo. |
| Dotada de grande resistência à seca, Cnidoscolus quercifolius Pohl (faveleira) é uma espécie que pode ser usada como forrageira, medicinal, alimentação humana, biodiesel e para recuperação de áreas degradadas. Entretanto, apresenta dificuldade de enraizamento pela técnica da estaquia e, por isto, foi avaliada a técnica alternativa da alporquia. Os tratamentos foram constituídos por substratos e concentrações de AIA (ácido indolacético). Foi observado um percentual de 46% de enraizamento no rejeito de vermiculita, com ganho significativo de matéria seca radicular. Não houve efeito significativo das doses de AIA, para as variáveis analisadas. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Recursos Florestais; Genética Vegetal Substratos; Fitorreguladores; Semiárido; Impacto ambiental; Rejeito de mineração Substrates; Phytoregulators; Semiarid; Environmental impact; Mining waste. |
| Ano: 2015 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/449 |
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| Medeiros,Lucas Silva de; Ramos,Telton Pedro Anselmo; Silva,Márcio Joaquim da; Paiva,Roney Emanuel Costa de; Lira,Mateus Germano Souza; Lima,Sergio Maia Queiroz. |
| Abstract Fishes from the coastal basins of the Mid-Northeastern Caatinga ecoregion (MNCE) were first sampled by the Stanford expedition at the beginning of the 20th century, and published by Edwin C. Starks in 1913. This material included specimens from the Papary lake (= Papari lagoon) in the lower portion of the Trairí river basin, draining towards the eastern coast of Rio Grande do Norte State. In 1941, Henry Fowler provided a broad taxonomic study of the freshwater fishes from northeastern Brazil, including material from the Papari lagoon, besides describing four species assigned to this locality. However, these previous surveys focused only in the lower portion of the Trairí river basin and might be incomplete. Given this framework, the present study... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mid-Northeastern Caatinga Ecoregion; Freshwater fishes; Coastal basins; Semiarid. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492019000100201 |
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| FERREIRA,ANDRÉ DA SILVA; ROCHA,AGDA ALVES DA. |
| ABSTRACTSpecies of Cerambycidae were inventoried in an area of Caatinga (dryland) vegetation in the municipality of Aracatu, Bahia State, Brazil, between August/2012 and July/2013. The insects were collected using light traps, active searches, and white cloth trapping. A total of 716 specimens of Cerambycidae were collected; 665 of them were identified as belonging to 107 species, 84 genera, 30 tribes, and 3 subfamilies. The speciesPhaedinus carbonelli Monné, 1999,Lepturges (Lepturges) fasciculatoides Gilmour, 1962,Hoplistonychus bondari Melzer, 1930,Ataxia arenaria Martins & Galileo, 2013 were new records for Bahia;Nesozineus obscurus Hoffmann, 1984 is new record for Brazil. The subfamily Cerambycinae demonstrated the greatest richness, with 56... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Neotropical Region; Inventory; Semiarid. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492015002500363 |
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| Ide,Andre Keiiti; Baptista,Gustavo Macedo de Mello. |
| Abstract: The objective of this work was to evaluate the applicability of time series of the enhanced vegetation index (EVI), from the moderate resolution imaging spectroradiometer (Modis), in the mapping of irrigated areas in the Northeastern region of Brazil. Annual time series from 2006 to 2015 were classified with the iterative self-organizing data analysis technique (Isodata) algorithm, generating a binary map of irrigated and nonirrigated areas for each year. In the Sertão region, the classification showed an average kappa coefficient of 0.66, underestimating the irrigated area by 7.6%, compared with data of the 2006 agricultural census. In regions more humid than the Sertão, such as Agreste and Zona da Mata Nordestina, the methodology showed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agricultural and environmental planning; EVI; Remote sensing; Semiarid; Vegetation index; Water resources management. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000100080 |
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| Gul,B; Islam,M; Ahmad,S; Gul,S. |
| Spatial and temporal patterns of aboveground biomass and nutritive value of rangeland species with respect to the influence of grazing and soil moisture were investigated. The research was conducted during two years at the Tomagh Research Station, near Sanjawi, Ziarat District, Balochistan, Pakistan. This area is protected from grazing since 1998; however, some of the area is open for grazing. Tree sites were selected for research purposes: a protected plain, a protected hilly, and an unprotected plain grazed area. Sampling was carried out during the spring, summer and autumn seasons. Results revealed that soil moisture was greater at the protected than unprotected sites. The aboveground plant biomass was 66% to 76% lower at unprotected than protected... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rangeland; Biomass production; Season; Semiarid; Grazing; Grass. |
| Ano: 2016 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572016000100013 |
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| MEHMOOD-UL-HASSAN,; QAYYUM,A.; SHER,A.; TAHIR,M.I.; AZEEM,M.; FAREED,A.. |
| ABSTRACT: Tillage practice has a significant role on weeds eradication and soil water conservation in crop production. Under semiarid agriculture, the monsoon rains (65%) are major source of water in Potohar, Pakistan, which can effectively be used mostly for winter crops production. To evaluate the impact of different tillage system for prevailing cropping systems and their weeds biomass under semiarid conditions, field experiment was conducted at the Arid University Research Farm Koont Rawalpindi (Pakistan) during crop growth seasons 2013-14 and 2014-15. Tillage systems as treatments were (a) three cultivations with a cultivator, as control treatment, (b) mold-board with two cultivations, (c) chisel-plough with two cultivations and (d) minimum tillage... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tillage; Cropping systems; Weeds; Biomass; Semiarid. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582020000100231 |
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| Galizoni, Flavia Maria; Ribeiro, Eduardo Magalhaes; Lopes, Elias Carlos; Chiodi, Rafael Eduardo; Reis, Ricardo Pereira. |
| O Alto-Médio São Francisco, inserido no bioma caatinga, está localizado na porção norte do estado de Minas, região semi-árida, marcada por uma distribuição muito irregular das chuvas no correr do ano. Esta região é alvo de projetos de irrigação, interessados principalmente nas águas do São Francisco, e na de seus principais afluentes. O objetivo deste artigo é analisar a relação entre comunidades de lavradores e água em um meio onde existe grande sazonalidade na disponibilidade natural de recursos hídricos e, ao mesmo tempo, incentivos maciços para projetos intensivos em uso de água. Procura analisar, principalmente, os manejos comunitários das águas realizados por agricultores familiares, a relação entre disponibilidade de água, produção de alimentos e... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Semi-árido; Agricultura familiar; Água; Semiarid; Family farmer; Water; Resource /Energy Economics and Policy. |
| Ano: 2008 |
URL: http://purl.umn.edu/106123 |
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| Rocha,Pedro Luís B. da; Queiroz,Luciano P. de; Pirani,José Rubens. |
| One dune habitat in the semi-arid Caatinga Biome, rich in endemisms, is described based on plant species composition, woody plant density, mean height and phenology and a multivariate analysis of the micro-habitats generated by variables associated to plants and topography. The local flora is composed mainly by typically sand-dweller species of Caatinga, suggesting the existence of a phytogeographic unity related to the sandy areas in the Caatinga biome, which seems to be corroborated by faunal distribution. Moreover, some species are probably endemic from the dunes, a pattern also found in vertebrates. The plant distribution is patchy, there is no conspicuous herbaceous layer and almost 50% of the ground represents exposed sand. Phenology is not... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Density; Endemic species; Phenology; Phytogeography; Semiarid. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042004000400013 |
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| Ferreira,José Thales Pantaleão; Ribeiro Filho,Mateus Rosas; Ribeiro,Mateus Rosas; Souza Júnior,Valdomiro Severino de; Bittar,Sheila Maria Bretas; Santos,Robson Gomes dos. |
| ABSTRACT The semiarid region of northeastern Brazil has a large area occupied by Planosols, where in the State of Pernambuco these soils are mainly used for livestock farming and subsistence crops. The knowledge on these soils is limited, which compromises the understanding on their behavior, potentialities and limitations.This study aimed to analyze morphological, chemical, physical and mineralogical attributes of Planosols developed under different geoenvironmental conditions. Morphological descriptions and chemical, physical and mineralogical analyses were performed in four profiles of Planosols along a rainfall gradient. An increase in rainfall allowed for an increase in the clay content in the Bt horizon and a reduction in ESP, EC, Na+, CEC, S, pH... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil mineralogy; Weathering; Climate; Semiarid. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100302 |
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| Registros recuperados: 73 | |
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