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| Registros recuperados: 177 | |
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| Guiraud,Deborah Maria Corrêa; Lenzi,Ervim; Luchese,Eduardo Bernardi; Fávero,Luzia Otília Bortotti. |
| Influence of some environmental variables in the loss of macronutrients N, P, K, from the hydrographic basin of the River Ivaí were analysed. Water samples of the river were monthly collected for five consecutive days during a year. In terms of total intervals of average monthly values and total average values experiment results, in mg L-1, were: N (0.32-3.22 and 1.65); K (0.73-2.69 and 1.38); P (not detected-0.39 and 0.076); COD (0.21-36.0 and 12.8); O2(dis) (1.89-8.40 and 5.43); and temperature (ºC) (16.0-30.8 and 24.6); pH (5.18-8.50 and 7.15). Statistical analysis of data showed that quantity of macronutrient (N, K, P) carried off from the hydrographic basin of the River Ivaí were directly correlated to fluviometric levels (caused by rainfall... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Erosion; Macronutrients; Hydrographic basin; Environment. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000400019 |
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| Carrasco-Letelier,Leonidas; Beretta-Blanco,Andrés. |
| Abstract Soil erosion can be accelerated by agricultural intensification, and the soil loss can alter the quality of water bodies. Sustainable agricultural production therefore requires the management of erosion and potential water pollution. In Uruguay, where there is heavy use of soil for agriculture, there is a need to continually develop and update erosion management policies. In this framework, we estimated the erosion in 99 drainage basins by analyzing and managing the information required (K, L, S, C and R-factors) in the universal soil loss equation (USLE) and the revised universal soil loss equation (RUSLE) in a geographical information system (GIS). The studied drainage basins encompass 73% of the area of Uruguay. The results include the... |
| Tipo: Journal article |
Palavras-chave: Erosion; GIS; RUSLE; USLE; Watersheds. |
| Ano: 2017 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202017000200184 |
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| Rivera,Samuel; Kershner,Jeffrey L; Keller,Gordon R. |
| Using forest roads produces more erosion and sedimentation than any other forest or agricultural activity. This study evaluated soil losses from a forest road in central Honduras over two consecutive years. We divided a 400-m segment of road into 8 experimental units, each 50 m in length. Four units were treated with Best Management Practices (BMPs) and four were left untreated. The BMP treatments included reshaping the road prism, installing culverts and reshaping of road ditches, compacting 20-cm layers of the road tread, crowning the road surface (3% slope, double drainage), longitudinal sloping (less than 12%), and adding a 10-cm layer of gravel (crush size = 0.63 cm). Soil movement was measured daily during the rainy seasons. The highest soil loss... |
| Tipo: Journal article |
Palavras-chave: Erosion; Forest roads; Honduras; Road surface; Soil; Tropical forest. |
| Ano: 2009 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000300009 |
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| Merten,Gustavo Henrique; Minella,Jean Paolo Gomes. |
| Tobacco production in Southern Brazil has caused a profound impact in the environment, resulting in heavy sediment yields and diminishing water quality. Public programmes have attempted to address these problems by encouraging the implementation of erosion control practices. To evaluate the impact of these programmes, a small rural catchment (1.33km²) in Arvorezinha county, in the state of Rio Grande do Sul, Brazil, has been monitored since 2001. Instruments to automatically monitor flow rate and precipitation were installed in the catchment and sediment has been measured manually using a DH-48 sampler. Despite lower rainfall in 2003, there was a significant increase in the frequency of low and average flow rates, and sediment yield increased 25% in 2003... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Erosion; Catchment monitoring. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782006000200050 |
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| Brandão, Roberto; Batista, Getulio; Catelani, Celso. |
| A crescente atividade do setor florestal voltado à produção de papel e celulose no vale do Paraíba no Estado de São Paulo tem despertado indagações sobre os potenciais impactos que essa atividade pode causar ao meio ambiente. Dentre outros pontos a serem avaliados, as estradas rurais que dão acesso aos maciços florestais de eucalipto têm ligação direta com a qualidade dos recursos hídricos existentes nas bacias onde são implantados os talhões de eucalipto, principalmente no que se refere à erosão e ao transporte de material erodido para os cursos d’água. Nesse contexto, o presente trabalho teve como objetivo analisar as condições das estradas utilizadas nos plantios de eucalipto nos municípios de Cunha e Guaratinguetá, SP. Para isso foram analisados os... |
| Tipo: Article |
Palavras-chave: Erosão; Erosion; Estradas florestais; Eucaliptus. |
| Ano: 2006 |
URL: http://hdl.handle.net/2315/47 |
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| Aguirre Salado, Olimpya Talya. |
| La presión por el uso de la tierra en México, ha provocado que en la superficie terrestre del país se presente algún nivel de degradación. Los principales procesos causales de la degradación de los suelos en México son la erosión hídrica y eólica, para contrarrestar esta problemática, el gobierno federal promueve estrategias de conservación y manejo sustentables de los suelos; para ello, las dependencias del gobierno realizan estas actividades con metodologías propias y dispersas para programar acciones, diseños, cálculos, y construcción, con sus respectivos conceptos de gastos. Por ello, y con el propósito de apoyar a los operadores de los programas de conservación de suelo y agua, se realizó este trabajo que consistió en la concepción y desarrollo de... |
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Palavras-chave: Erosión; Programación; Software; Diseño hidráulico; Erosion; Programming; Hydraulic design; Hidrociencias; Maestría. |
| Ano: 2012 |
URL: http://hdl.handle.net/10521/756 |
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| Delgado,María I. |
| The Ventania System is a hilly area emerging in the extended Pampas plains of Argentina. Shallow soils with rock fragments and steep slopes are the main limitations for agriculture in this area. The effect of land use changes on annual soil loss on these soils in the Belisario Creek watershed was estimated. The universal soil loss equation (USLE) was applied for 1966 and 2016 to estimate soil loss generated by water erosion at the watershed scale. The equation was fed with rainfall, soil, slope, land use and management local data. Critical areas were identified using a geographic information system. The watershed has increased its fragility. For instance, the ranges of high and very high risk of soil loss (>50 Mg.ha-1.y-1.) increased their coverage from... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Land use change; Erosion; Territorial management. |
| Ano: 2018 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2018000100011 |
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| Tarigan, Suria; Soil and Natural Resources Management, Bogor Agricultural University, Indonesia; surya.tarigan@yahoo.com; Agusta, Herdhata; Agronomy and Horticulture, Bogor Agricultural University, Indonesia; agusta@gmx.at; Gunawan, Dodo; Center of Climate Change and Air Quality, Agency for Meteorology, Climatology and Geophysics, Jakarta, Indonesia; dodogunawan88@gmail.com; Hein, Jonas; Department for Environmental Policy and Natural Resource Management, German Development Institute, Bonn, Germany; Jonas.Hein@die-gdi.de; Hendrayanto, ; Forest Management Department, Faculty of Forestry, Bogor Agricultural University, Indonesia; hendrayanto@gmail.com. |
| Conversions of natural ecosystems, e.g., from rain forests to managed plantations, result in significant changes in the hydrological cycle including periodic water scarcity. In Indonesia, large areas of forest were lost and extensive oil palm plantations were established over the last decades. We conducted a combined social and environmental study in a region of recent land-use change, the Jambi Province on Sumatra. The objective was to derive complementary lines of arguments to provide balanced insights into environmental perceptions and eco-hydrological processes accompanying land-use change. Interviews with villagers highlighted concerns regarding decreasing water levels in wells during dry periods and increasing fluctuations in stream flow between... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Eco-hydrology; Environmental perception; Erosion; Evapotranspiration; Forest; Land-use change; Runoff; Rural water supply; Streamflow; Transpiration. |
| Ano: 2016 |
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| Vanzela,Luiz S.; Grecco,Diego L. G.; Costa Neto,José N. da; Santos,Gilmar O.. |
| The siltation is a natural process, but can be accelerated by human actions and results in major problems for the reservoirs, reducing its useful volume for irrigation. An example of this problem was the reduction of the area of mirror water of Fernandópolis municipal dam in 48.3% during 20 years. Therefore, this study aimed to evaluate the production of sediments and siltation of Fernandópolis municipal dam from a methodology that can be applied to small earth dams for agricultural purposes. For this, it was monitored, monthly throughout the year, the volume of sediment deposited in the reservoir. The percentage of retention sediment in Fernandópolis municipal dam ranged from 53.9 to 94.5%, that associated with a high specific sediment yield, will cause... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hydro-sedimentology; Use and land occupation; Erosion. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000500010 |
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| DEDECEK, R. A.. |
| Uma agricultura intensiva e permanente depende muito do equilibrio entre perdas e ganhos de nutrientes. Os ganhos sao representados pela adubacoes quimicas e organicas e incorporacao da resteva, e as perdas, pelo cultivos, lixiviacao, volatilizacao e erosao. A erosao nao e seletiva quimicamente, nao produzindo concentracoes diversificadas de nutrientes entre o sedimento e o solo que o formou (tabela 1). A selecao ocorre no maior arraste da materia organica e das particulas mais finas do solo, que sao as armazenadoras dos nutrientes. Os menores teores de nutrientes no tratamento solo descoberto devem-se ao fato de que este recebeu apenas adubacao corretiva de P e K, alem da calagem, em 1977, tendo sido mantido sem vegetacao desde entao e preparado todos... |
| Tipo: Folhetos |
Palavras-chave: Erosion; Environments; Centro de Pesquisa Agropecuaria dos Cerrados; Brasil; Conservation; Prática de conservação; Conservação; Cerrado; Erosão; Manejo do Solo; Meio Ambiente; Solo; Brazil; Soil management; Savannas; Soil. |
| Ano: 1986 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/546925 |
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| Registros recuperados: 177 | |
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