|
|
|
| Registros recuperados: 15 | |
|
|
| Shigaki,Francirose; Sharpley,Andrew; Prochnow,Luís Ignácio. |
| Eutrophication has become a major threat to water quality in the U.S., Europe, and Australasia. In most cases, freshwater eutrophication is accelerated by increased inputs of phosphorus (P), of which agricultural runoff is now a major contributor, due to intensification of crop and animal production systems since the early 1990s'. Once little information is available on the impacts of Brazilian agriculture in water quality, recent changes in crop and animal production systems in Brazil were evaluated in the context of probable implications of the fate of P in agriculture. Between 1993 and 2003, there was 33% increase in the number of housed animals (i.e., beef, dairy cows, swine, and poultry), most in the South Region (i.e., Paraná, Rio Grande do Sul, and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Diffuse pollution; Eutrophication; Poultry production; Swine production; Surface runoff. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000200013 |
| |
|
| |
|
|
| Pinho,A.P.; Matos,A.T.; Morris,L.A.; Costa,L.M.. |
| Adsorption of two herbicides, atrazine and picloram, displaying different sorption characteristics, were evaluated for O (organic) horizon samples collected from SMZs (streamside management zones) in Piedmont (Ultisol) of Georgia, USA. Samples were randomly collected from within 5 SMZs selected for a study of surface flow in field trials. The five SMZs represented five different slope classes, 2, 5, 10, 15 and 20%. Results indicate that 0 horizons have the potential for sorbing atrazine from surface water moving through forested SMZs. Atrazine adsorption was nearly linear over a 24-hour period. Equilibrium adsorption, determined through 24-hour laboratory tests, resulted in a Freundlich coefficient of 67.5 for atrazine. For picloram, negative adsorption... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Herbicide retention; Litter layer; Sorption; Surface runoff; Solute transport. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582007000100013 |
| |
|
|
| Huerta Olague, José de Jesús. |
| Se avaluó el efecto de la cobertura vegetal y de las raíces, de maíz (Zea mays L.), frijol (Phaseolus vulgaris L.), calabacita (Cucurbita pepo L.) y avena (Avena sativa L.), sobre el escurrimiento superficial y la perdida del suelo. El trabajo se realizo en un campo experimental de la Universidad Autónoma Chapingo y se utilizaron 8 tratamientos, 2 para cada cultivo (4 fueros subparcelas con cobertura vegetal y 4 subparcelas sin cobertura y solo con raíces, mismas que resultaron de cortar al ras del suelo los cultivos estudiados. La cobertura vegetal se midió en porcentajes y el sistema radical en densidad longitudinal de raíces (DLR). Se aplicó lluvia simulada a los 15, 30, 50 y 65 días de desarrollo sobre lotes de escurrimiento de 1 metro cuadrado y 10%... |
| Tipo: Tesis |
Palavras-chave: Escurrimiento superficial; Pérdida de suelo; Cobertura vegetal; Raíces; Maestría; Hidrociencias; Surface runoff; Soil loss; Vegetative cover; Roots. |
| Ano: 2007 |
URL: http://hdl.handle.net/10521/1271 |
| |
|
|
| Giaccio,GCM; Laterra,P; Aparicio,VC; Costa,JL. |
| In this study, we examined some aspects regarding the effect of willow trees (Salix fragilis L.) invasion of grassland riparian environments in the Argentinean Pampas on the runof reduction, sedimentation and glyphosate retention in the riparian vegetation strip (RVS). To assess the influence of willows on the filtering mechanisms, we performed runof simulation experiments in plots of 1.5 x 2.5 m, in coastal environments characterized by the presence of willows or the lack of trees. Despite the short length of the experimental plots, the retention of glyphosate in the controls, with no trees, was higher and reached almost 74%. Nevertheless, sediment retention did not differ significantly between the tree areas and the grassy controls. The runoff reduction... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Riparian vegetation retention; Surface runoff; Sediment retention; Glyphosate retention; Ecosystem services. |
| Ano: 2016 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572016000100015 |
| |
|
|
| 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 |
| |
|
|
| Ramírez Cruz, Maidali Erizabeth. |
| Los incendios forestales, además de afectar la calidad del aire y la cubierta vegetal, provocan cambios importantes en las propiedades hidrológicas del suelo, aceleran el proceso de erosión y contaminan por sedimentación. Sin embargo, en México, la información relacionada con los incendios esta más enfocada a estudiar y documentar el impacto ambiental sobre la calidad del aire y la cubierta vegetal, sin ahondar en los efectos sobre el suelo , el escurrimiento superficial y la producción de sedimentos. Por tal motivo, el objetivo de este trabajo fue evaluar la severidad de la quema sobre la infiltración del agua, la producción de escurrimiento superficial y sedimentos. Se evaluaron doce tratamientos derivados de las cuatro severidades de quema... |
| Tipo: Tesis |
Palavras-chave: Severidad de quema; Sedimentos; Escurrimiento superficial; Lluvia simulada; Doctorado; Hidrociencias; Fire severity; Sediments; Surface runoff; Simulated rain. |
| Ano: 2009 |
URL: http://hdl.handle.net/10521/1292 |
| |
|
|
| Aguiar,Wagner de; Sampaio,Silvio C.; Paisani,Julio C.; Reis,Ralpho R. dos. |
| ABSTRACT Changes in the Brazilian Forest Code (BFC) have soften the criteria for recovery and conservation of permanent preservation areas (PPAs), enhancing processes related to surface runoff. The aim of this study is to understand the effects of changes in PPA classification criteria established by BFC of 2012 to the detriment of BFC from 1965 considering the surface runoff response in the basin draining the upper Marrecas River valley in the flow peaks. The HEC–HMS model was used to simulate flow peaks considering three land-use scenarios, representative of the current use, adapting it to PPAs fitted to the BFC of 1965 and 2012 and seven precipitation return periods. In the proposed scenarios, the use of BFC of 2012, to the detriment of that from 1965,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Surface runoff; Forestry legislation; Hydrological simulation; Land use. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000200277 |
| |
|
| |
|
| |
|
|
| Almeida,Wilk S. de; Carvalho,Daniel F. de; Pereira,Fernandes A. C.; Rouws,Janaína R. C.. |
| ABSTRACT The study was carried out to evaluate sediment production, water infiltration and surface runoff in an Ultisol under simulated rainfalls with similar erosivity, but different combinations of intensity (Int) and duration (Dur). The rainfalls were applied after soil tillage in the period from August to September 2017, in Seropédica, RJ State, Brazil. Using a computer program, the treatments were defined from the erosivity calculated for a rainfall with intensity of 60 mm h-1 and duration of 60 min, resulting in the other combinations of Int and Dur: 44.5 mm h-1 and 106 min; 53.5 mm h-1 and 78 min; 66.9 mm h-1 and 48 min; and 76.5 mm h-1 and 38 min, in a completely randomized design with five repetitions. Sediment production varied from 2.17 to 6.11... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Erosivity; Rainfall intensity; Rainfall duration; Surface runoff. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000800572 |
| |
|
|
| Villagra-Mendoza, Karolina; Carvajal-Vanegas, Dorian; Beck-Broichsitter, Steffen; Horn, Rainer. |
| Biochar is considered as an option to ameliorate soil functions, by improving soil physical and hydraulic soil properties. This study investigated the effect of biochar and of wetting and drying cycles on the water infiltration at laboratory and at a hypothetical watershed scenario. In the laboratory, test samples with 2.5 and 5% (by dry mass) of a mango-wood biochar were added to a sandy and sandy loam soil material. Cumulative infiltration was determined after simulated intense wetting and drying cycles, by drying the samples at 30°C for three consecutive days. Additionally, biochar amended soil hydraulic parameters, obtained at the laboratory, were used to simulate the water discharge of a hypothetical watershed, with the Soil and Water Assessment Tool... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Infiltration; Watershed; Biochar; Surface runoff; Wetting; Drying. |
| Ano: 2020 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5562 |
| |
|
|
| Cassol,Elemar Antonino; Silva,Tiago Stumpf da; Eltz,Flávio Luiz Foletto; Levien,Renato. |
| ABSTRACT: Erodibility represents the intrinsic susceptibility of the soil to the erosion process, represented by the K factor in the Universal Soil Loss Equation (USLE). In Brazil, there are few field experiments determined with a series larger than ten years of data, which are the most reliable for quantifying the K factor. The aim of this study was to determine the K factor of the USLE by the direct method, relating soil losses determined in the field under standard conditions to erosivity of rains, and by the analytic method, applying the Wischmeier nomograph. The data on soil loss by water erosion were obtained in a field experiment under natural rainfall conditions from 1976 to 1989 in an Ultisol at the Agronomic Experimental Station in Eldorado do... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water erosion; Soil loss; Soil properties; Erosion modeling; Surface runoff. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100518 |
| |
|
|
| Silva,Gilka Rocha Vasconcelos da; Souza,Zigomar Menezes de; Martins Filho,Marcílio Vieira; Barbosa,Ronny Sobreira; Souza,Gustavo Soares de. |
| Interrill erosion occurs by the particle breakdown caused by raindrop impact, by particle transport in surface runoff, by dragging and suspension of particles disaggregated from the soil surface, thus removing organic matter and nutrients that are essential for agricultural production. Crop residues on the soil surface modify the characteristics of the runoff generated by rainfall and the consequent particle breakdown and sediment transport resulting from erosion. The objective of this study was to determine the minimum amount of mulch that must be maintained on the soil surface of a sugarcane plantation to reduce the soil, water and nutrient losses by decreasing interrill erosion. The study was conducted in Pradópolis, São Paulo State, in 0.5 x 1.0 m... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Surface runoff; Cane trash; Rain simulation. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000300026 |
| |
|
|
| Rieger,Fernando Alexandre; Zolin,Cornélio Alberto; Paulino,Janaina; Souza,Adilson Pacheco de; Matos,Eduardo da Silva; Magalhães,Ciro Augusto de Souza; Farias Neto,Austeclínio Lopes de. |
| ABSTRACT Water erosion is one of the main factors driving soil degradation, which has large economic and environmental impacts. Agricultural production systems that are able to provide soil and water conservation are of crucial importance in achieving more sustainable use of natural resources, such as soil and water. The aim of this study was to evaluate soil and water losses in different integrated production systems under natural rainfall. Experimental plots under six different land use and cover systems were established in an experimental field of Embrapa Agrossilvipastoril in Sinop, state of Mato Grosso, Brazil, in a Latossolo Vermelho-Amarelo Distrófico (Udox) with clayey texture. The treatments consisted of perennial pasture (PAS), crop-forest... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Surface runoff; Natural rain; Soil loss; Water loss; Land slope. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100513 |
| |
| Registros recuperados: 15 | |
|
|
|
