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	Provedor de dados Rev. Ciênc. Agron. (3) Autor Andrade,Eunice Maia de (3) Palácio,Helba Araújo de Queiroz (3) Santos,Julio Cesar Neves dos (3) Araújo Neto,José Ribeiro de (2) Medeiros,Pedro Henrique Augusto (2) Guerreiro,Maria João Simas (1) Meireles,Ana Célia Maia (1) Mais... Palavra-chave Arid regions (1) Hydrological and sedimentological behaviour (1) SDR (1) Scale effect (1) Sediment yield (1) Sediments (Geology) (1) Soil erosion (1) Soil loss (1) Soil-erosion (1) USLE (1) Mais... Tipo do documento Info:eu-repo/semantics/article (3) Ano 2017 (2) 2011 (1) País Brazil (3) Idioma Inglês (3)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última Land use impact on soil erosion at different scales in the Brazilian semi-arid Rev. Ciênc. Agron. Santos,Julio Cesar Neves dos; Andrade,Eunice Maia de; Medeiros,Pedro Henrique Augusto; Guerreiro,Maria João Simas; Palácio,Helba Araújo de Queiroz. ABSTRACT Erosion and sediment transport processes are strongly dependent on the spatial scale and land use. The objective of this study is to analyse the effects of slash and burn of vegetation followed by grass cultivation for grazing, on the hydrological and sedimentological behaviour at different spatial scales in a semiarid region in Brazil. Rainfall, runoff and soil loss were measured during three years (total of 116 rainfall-runoff events) at three spatial scales: 1 m2 and 20 m2 plots and 2.8 ha watershed. During the first year (2009) the native dry tropical forest/Caatinga vegetation was maintained, whereas on the following years (2010 and 2011) the original vegetation was cleared using slash and burn techniques to grow pasture (Andropogon gayanus... Tipo: Info:eu-repo/semantics/article Palavras-chave: Hydrological and sedimentological behaviour; Soil loss; Scale effect. Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902017000200251 Sediment delivery ratio in a small semi-arid watershed under conditions of low connectivity Rev. Ciênc. Agron. 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 Runoff and soil and nutrient losses in semiarid uncultivated fields Rev. Ciênc. Agron. 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 Registros recuperados: 3 Primeira ... 1 ... Última

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