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Registros recuperados: 24 | |
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Pereira Júnior,Lécio Resende; Andrade,Eunice Maia de; Palácio,Helba Araújo de Queiroz; Raymer,Poliana Costa Lemos; Ribeiro Filho,Jacques Carvalho; Pereira,Francisco Jairo Soares. |
ABSTRACT The dry forests are the type most widely distributed vegetation in the tropics, and studies aimed at quantifying the carbon stock in these forests are important for it to be quantified their participation as mitigating the effects of climate change. With that in mind, the aim of this research was to quantify the carbon stocks in the woody, herbaceous, litter and root components of a patch of dry tropical forest, with 30 years of regeneration in Iguatu-CE, Brazil. Initially the vegetation was inventoried by means of a floristic and phytosociological survey of the woody component in a 1 ha area which had been under conservation. The biomass was then estimated employing allometric equations, and the stored carbon was quantified. Stocks of carbon in... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Semi-arid; Caatinga; Biomass. |
Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902016000100032 |
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Neto,José Ribeiro de Araújo; Andrade,Eunice Maia de; Palácio,Helba Araújo de Queiroz; Sales,Maria Monaliza de; Maia,Anthony Rafael Soares. |
ABSTRACT The growing pressure on water resources has reduced its availability as regards quality. Data was investigated for two different periods, with the aim of evaluating the influence of the use and occupation of space on the temporal dynamics of the quality of surface and groundwater in the perennialised valley of the Trussu River in the State of Ceará, Brazil. The first period was from September 2002 to February 2004 and the second from April 2013 to April 2014. Twenty-two water samples were taken from nine sampling stations, five on the surface and four underground. The same stations were considered, monitoring 12 attributes of water quality for a total of 2,376 analyses. Temporal dynamics were characterised employing a technique of multivariate... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water contamination; Multivariate analysis; Semi-arid region. |
Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902017000100059 |
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Lima,Cleene Agostinho de; Montenegro,Abelardo Antônio de Assunção; Santos,Thais Emanuelle Monteiro dos; Andrade,Eunice Maia de; Monteiro,Adriano Luiz Normandia. |
RESUMOObjetivou-se com esta pesquisa avaliar as características hidráulicas do escoamento superficial e o desempenho de práticas agrícolas sob a cultura da mandioca, no controle da erosão hídrica em Latossolo Amarelo álico coeso de textura franco argilo-arenosa. O experimento foi conduzido em uma área de 240 m2 e declividade de 0,07 m m-1, na Universidade Federal do Recôncavo da Bahia, Cruz das Almas, Bahia, Brasil. O arranjo experimental foi em delineamento inteiramente casualizado, com quatro tratamentos e três repetições, em parcelas de erosão com área de 3 m2, sob três intensidades de chuva simulada: 62 mm h-1, 90 mm h-1 (intensidade constante) e 40 e 90 mm h-1 (intensidade variável) e condições de cobertura. Foram adotados os seguintes tratamentos:... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Intensidades de chuva; Erosão hídrica; Cobertura morta; Consórcio de culturas. |
Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902015000400697 |
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Alexandre,Deborah Mithya Barros; Andrade,Eunice Maia de; Lopes,Fernando Bezerra; Palácio,Helba Araújo Queiroz; Ferreira,Andrea Cristina da Silva. |
This study was carried out in the Serrote reservoir, sited in the Groaíras watershed at the northeastern region of Ceará State, Brazil. The aim was to investigate the temporal and spatial variability of water quality. Data investigation was processed using multivariate analysis/cluster analysis and GIS techniques. Samples were taken in four stations spreading out over the water body during five campaigns of collection (February, May, August/2007 and May, August/2008). The water quality parameters analyzed were: Electric Conductivity (EC), pH, Dissolved Oxygen (DO), temperature, chlorophyll 'a' concentration and Total Phosphorus (TP). Two homogeneous groups were identified, which expressed the inter-annual seasonality influence in the water quality. The... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water quality; Cluster Analysis; Eutrophization. |
Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902010000400007 |
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Andrade,Eunice Maia de; Lopes,Fernando Bezerra; Palácio,Helba Araújo Queiroz; Aquino,Deodato do Nascimento; Alexandre,Deborah Mithya Barros. |
The aim of this work was to identify and to investigate the determining factors of water table quality in the Irrigated Perimeter of Baixo Acaraú, Ceará, Brazil, using factor analysis/principal component analysis (FA/PCA). It was sampled nine shallow wells spread out on two different types of land: uncultivated area (A1) and irrigated area (A2). Groundwater was sampled monthly from Dec/2003 to Nov/2005, Nov/2006, Mar and April/2007. We measured the following parameters: pH, electrical conductivity (EC), and concentrations of Na+, Ca2+, Mg2+, K+, Cl-, PO4-, NH4-, NO3-, SO4-2, HCO3- and CO3- 2. The PCA resulted in a model composed of three components that explained 93.06% and 83.72% of the total variance of the data set from A1 and A2, respectively. It was... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anthropic action-fertilizer; Shallow wells; Irrigation-water contamination. |
Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902010000200006 |
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Chaves,Luiz Carlos Guerreiro; Lopes,Fernando Bezerra; Maia,Anthony Rafael Soares; Meireles,Ana Célia Maia; Andrade,Eunice Maia de. |
ABSTRACT The semi-arid region of Brazil is characterised by the irregular temporal and spatial distribution of the rainfall, which together with anthropogenic action causes degradation of the water quality. The aim of this study was to evaluate water quality in surface reservoirs in the Brazilian semi-arid region due to rainfall variability and the degree of anthropisation of the watersheds. Water samples were collected at the Orós, Trussu and Muquém reservoirs during August and December of 2012, April, October and December of 2013, and March and June of 2014 (dry and rainy periods). The following limnological attributes were analysed: electrical conductivity, pH, turbidity, transparency and chlorophyll-a, with the results evaluated using box plots, and... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anthropised area; Surface water; Spatial and temporal variability of precipitation. |
Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902019000200223 |
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Andrade,Eunice Maia de; Silva,Bernardo Barbosa da; Rodrigues,Meilla Marielle Araújo; Mendonça,Marcos Amauri Bezerra; Chaves,Luiz Carlos Guerreiro. |
Despite uncertainties as to the real causes, there is a large amount of evidence of climatic change on Earth. With the objective of investigating changes in extreme air temperatures, as well as the local effects of these changes, eight data sets, collected throughout the State of Ceará in Brazil, were analyzed. Four series of data were obtained from the semi-arid region, three from the coastal zone, and one from a mountainous region. To quantify the changes that occurred during the study period, variations in maximum and minimum temperatures were calculated in relation to the mean of each data series. The annual rates of temperature increase were estimated from the angular coefficients of the best-fit lines. The results showed that although there are... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Climatic changes; Global warming; Air temperature. |
Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902012000200008 |
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Meireles,Ana Célia Maia; Andrade,Eunice Maia de; Chaves,Luiz Carlos Guerreiro; Frischkorn,Horst; Crisostomo,Lindbergue Araujo. |
A study on surface water quality in the Acaraú Basin, in the North of the state of Ceará, Brazil was performed. Qualitative dynamics of water flowing to the Acaraú River that supplies water to the irrigation project in the area was evaluated. Multivariate Factor Analysis/Principal Component Analysis was used for evaluation of water quality in order to develop a water quality index (WQI) that reflects soil salinity and sodicity risks and water toxicity to plants. From April/2003 to September/2005 water were sampled from ten sampling sites covering the basin, where physical and chemical parameters that contribute to the WQI were evaluated. The results showed that the use of water for irrigation in the Acaraú basin, according to the proposed WQI, are... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water Irrigation; Soils/salinity; Soils/sodium content; Acaraú Basin (Brazil). |
Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902010000300005 |
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Ferreira,Kássia Crislayne Duarte; Lopes,Fernando Bezerra; Andrade,Eunice Maia de; Meireles,Ana Célia Maia; Silva,Gerlange Soares da. |
Conhecer a qualidade da água de um reservatório utilizado para consumo humano é importante. Os índices de qualidade de água são utilizados para facilitar a compreensão dessa qualidade. Este estudo teve como objetivos adaptar e comparar o índice de qualidade de água da National Sanitation Foundation, às condições físicas, químicas e biológicas das águas de reservatórios artificiais em regiões com clima semiárido tropical, bem como a variabilidade espaço-temporal do mesmo. Foram realizadas doze coletas de água de abril de 2008 a abril de 2010 em sete pontos amostrais distribuídos no reservatório Orós, na região centro sul do estado do Ceará. Os atributos de qualidade de água monitorados utilizados para cálculo e adaptação do índice foram: pH, temperatura,... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Água-qualidade; Reservatórios; Águas superficiais. |
Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902015000200277 |
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Santos,Júlio César Neves dos; Andrade,Eunice Maia de; Araújo Neto,José Ribeiro de; Meireles,Ana Célia Maia; Palácio,Helba Araújo de Queiroz. |
Water body eutrophication process has been a serious problem around the world, especially in semiarid and arid region where main approach to storage water is reservoir. The aim of this work was to investigate the spatial and seasonal variability in water quality of a reservoir in a semi-arid tropical region with regards to its trophic state, and to identify the sources of nutrient input to the reservoir. Essa pesquisa foi realizada no reservatório Orós, segundo maior do estado do Ceará-Brasil. This research was developed in the Orós reservoir, the second one most important reservoir in Ceará State, Brazil. Samples were collected bimonthly during the period April 2008 to April 2010, from sex sampling points representing the outlet of tributaries, and one... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water resources; Reservoirs; Water quality. |
Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902014000100005 |
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Andrade,Eunice Maia de; Rodrigues,Rafael do Nascimento; Palácio,Helba Araújo de Queiroz; Brasil,José Bandeira; Guerreiro,Maria João Simas. |
ABSTRACT The greater probability of small rainfall events occurring in semi-arid regions, and the little understanding of their role in hydrological processes, has led to this investigation of surface runoff generated during these events in two adjacent micro basins in the Brazilian semi-arid region. The types of plant cover to be investigated were the Phytogeographical Caatinga Domain under regeneration for 35 years (CPDReg) and thinned CPD (CPDThin), which consisted of the elimination of trees with a diameter of <10 cm. Two historical series were considered, one of 40 years (1974-2013) with 2,259 events and the other consisting of 247 rainfall events of <30 mm from 2009 to 2013. The cumulative frequency distribution showed that the series of 247... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Eco-hydrological processes; Seasonally Dry Tropical Forest; Thinning; Surface runoff; Rainfall patterns. |
Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902020000200408 |
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Fernandes,Francisco Bergson Parente; Lacerda,Claudivan Feitosa de; Andrade,Eunice Maia de; Neves,Antônia Leila Rocha; Sousa,Carlos Henrique Carvalho de. |
RESUMOA variabilidade das chuvas no semiárido ocasiona, frequentemente, insuficiências hídricas durante o ciclo do feijão-de-corda (Vigna unguiculata (L.) Walp.), afetando o seu rendimento. Objetivou-se investigar o efeito de diferentes manejos do solo no déficit hídrico do solo, nas trocas gasosas foliares e no rendimento do feijão-de-corda, em regime de sequeiro no semiárido. O delineamento experimental foi o inteiramente casualizado em parcelas subdivididas com cinco sistemas de manejo (tratamentos), duas camadas de solo (0,15 e 0,30 m) e quatro repetições. Os manejos investigados foram: T-P, solo mobilizado somente pela enxada; T-ESC, solo escarificado a 0,30 m; T-CS, solo com subsolagem e captação in situ; o T-CCM, subsolagem, captação in situ e... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vigna unguiculata; Solos-manejo; Plantio de sequeiro; Estresse hídrico. |
Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902015000300506 |
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Santos,Julio Cesar Neves dos; Andrade,Eunice Maia de; Medeiros,Pedro Henrique Augusto; Palácio,Helba Araújo de Queiroz; Araújo Neto,José Ribeiro de. |
ABSTRACT The semi-arid region in the northeast of Brazil is characterised by rains of high intensity and short duration, with the processes of erosion being aggravated by an inappropriate land-use model. In this region, the lack of measured data for runoff and sediment yield increases the need to apply hydro-sedimentological models in estimating erosion, requiring knowledge of the actual sediment delivery ratio for the region. The aim of this study therefore, was to map soil erosion, making use of the Universal Soil Loss Equation (USLE), in the Iguatu Experimental Watershed (IEW). The mean annual sediment delivery ratio (SDR), and the SDR for individual events, was calculated from hydro-sedimentological measurements, contributing to an understanding of the... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sediment yield; Soil erosion; USLE; SDR. |
Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902017000100049 |
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Santos,Julio Cesar Neves dos; Palácio,Helba Araújo de Queiroz; Andrade,Eunice Maia de; Meireles,Ana Célia Maia; Araújo Neto,José Ribeiro de. |
Although water erosion is the principle agent responsible for soil degradation, field data on the impacts of erosion, due to high operational costs and measurement difficulties, are scarce, especially in semiarid regions. In this context, the aim of this study was to evaluate runoff and soil and nutrient losses in uncultivated areas in the semiarid region of the state of Ceará in Brazil. The experiment was conducted in a 20 m² erosion plot that was uncultivated and populated with herbaceous plants. Data were collected during the rainy season from January to May 2009. Monthly water losses from overland flow ranged from 3.4 to 168.9 mm, representing 1.8 to 42.3% of the total monthly rainfall for January and April, respectively. Soil loss from erosion totaled... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil-erosion; Sediments (Geology); Arid regions. |
Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902011000300030 |
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Palácio,Helba Araújo de Queiroz; Andrade,Eunice Maia de; Lopes,Fernando Bezerra; Alexandre,Deborah Mithya Barros; Arraes,Francisco Dirceu Duarte. |
Com a demanda de água crescendo a cada ano, é necessária uma maior atenção aos fatores responsáveis da qualidade das águas. Esta pesquisa teve como objetivo identificar a similaridade de variáveis determinantes da qualidade das águas do trecho perenizado da bacia do Curu, Ceará, durante a estação seca e chuvosa, pelo emprego de análise multivariada. As amostras de água foram coletadas em sete pontos (georreferenciados), nos meses de janeiro, março, maio e agosto de 2005, totalizando 28 amostras. Nas águas, foram analisados os seguintes atributos: pH, CE, Ca2+, Mg2+, Na+, K+, Cl-, CO3-, HCO3-, SO4-, PO4(3-), NH4- e NO3-. Quatro grupos homogêneos foram identificados, sendo estes independentes da posição geográfica dos pontos de coleta, demonstrando a maior... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Qualidade de água; Sazonalidade; Análise de agrupamento; Análise multivariada. |
Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782009000900017 |
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Registros recuperados: 24 | |
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