136 results

Physicogenic and biogenic aggregates under different management systems in the Cerrado region, Brazil

Luiz Alberto da Silva Rodrigues Pinto ORCID logo , José Luiz Rodrigues Torres ORCID logo , Igor de Sousa Morais ORCID logo , Robert Ferreira ORCID logo , Wanderson Farias da Silva Júnior ORCID logo , Sandra de Santana Lima ORCID logo , [...]

23/abr/2021

ABSTRACT An important strategy for the sustainable management of Cerrado soils is no-till (NT) systems, which may improve soil properties, particularly aggregation. Soil aggregates can be categorized according to their formation pathways into physicogenic (Phy) and biogenic (Bio). This study aimed (i) to quantify the relative proportion of physicogenic and biogenic aggregates and (ii) evaluate the levels of total organic carbon and their respective humic and physical fractions in the aggregates’ formation pathways. The following managed and unmanaged sites were […]

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Sediment source and volume of soil erosion in a gully system using UAV photogrammetry

Bernardo Moreira Cândido ORCID logo , Mike James ORCID logo , John Quinton ORCID logo , Wellington de Lima ORCID logo , Marx Leandro Naves Silva ORCID logo

11/nov/2020

ABSTRACT Gully erosion is a severe way of land degradation. Gullies threaten the sustainability of agro-ecosystems, causing quantitative and qualitative reduction of groundwater, farmland productivity, and waterways sedimentation. Since the gully development on the surface begins with water flow and sheet erosion, accurate monitoring of the erosive processes in a gully system and its quantification is key for the development of effective strategies to control soil erosion in gullies. Here, we demonstrate the first use of unmanned aerial vehicle (UAV) […]

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Developing scoring functions to assess soil quality at a regional scale in rangelands of SW Spain

Manuel Pulido Fernández ORCID logo , Ali Keshavarzi ORCID logo , Jesús Rodrigo-Comino ORCID logo , Susanne Schnabel ORCID logo , Joaquín Francisco Lavado Contador ORCID logo , Álvaro Gómez Gutiérrez ORCID logo , [...]

06/nov/2020

ABSTRACT The drawing of maps of soil quality at a large scale is increasingly being more useful to land planners and stakeholders. Nevertheless, it involves different methodological steps from the description of soil profiles in the field until the regional mapping of integrative soil quality index (IQI) values. The development of proper scoring functions is a paramount task for the calculation of these IQI values since every parameter needs to be standardized accordingly and weighting factors are usually estimated by […]

Visual Abstract

Hydrosedimentological modeling in a headwater basin in Southeast Brazil

Eliete Nazaré Eduardo Mauri ORCID logo , Marcelo Ribeiro Viola ORCID logo , Lloyd Darrell Norton ORCID logo , Phillip Ray Owens ORCID logo , Carlos Rogério de Mello ORCID logo , Leandro Campos Pinto ORCID logo , [...]

23/out/2020

ABSTRACT Hydrosedimentological modeling is a useful tool to predict the water dynamic in a basin and for water resources management. This study aimed to i) evaluate the ability of Soil and Water Assessment Tool (SWAT) to model sediment load and continuous monthly streamflow in the Mortes River Basin (MRB) in Southeastern Brazil; ii) estimate the sediment yield spatially distributed by sub-basins; iii) estimate the sediment load export to the Funil Hydroelectric Power Plant reservoir (FHPP), located in the MRB outlet. […]

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Impact of land use on Histosols properties in urban agriculture ecosystems of Rio de Janeiro, Brazil

Otavio Augusto Queiroz dos Santos ORCID logo , Eduardo Carvalho da Silva Neto ORCID logo , Andrés Calderín García ORCID logo , Hugo de Souza Fagundes ORCID logo , Yan Vidal de Figueiredo Gomes Diniz ORCID logo , Robert Ferreira ORCID logo , [...]

01/set/2020

ABSTRACT Histosols provide several ecosystem services, related mainly to their reserves of carbon and nitrogen. Management practices in these soils can increase the mineralization of organic matter and contribute to the emission of greenhouse gases. This study aimed to investigate the effect of tillage with plowing and drainage on Histosol properties in three land use systems located in the municipality of Rio de Janeiro, Brazil. Three areas subjected to different land use systems over the last twenty years were chosen: […]

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Monitoring land use impacts on sediment production: a case study of the pilot catchment from the Brazilian program of payment for environmental services

Diêgo Faustolo Alves Bispo ORCID logo , Pedro Velloso Gomes Batista ORCID logo , Danielle Vieira Guimarães ORCID logo , Marx Leandro Naves Silva ORCID logo , Nilton Curi ORCID logo , John Norman Quinton ORCID logo

18/ago/2020

ABSTRACT Through the lack or non-use of conservationist criteria for adequate land use and management, the scarcity of natural resources becomes ever more evident. This study aimed to analyze the origin of the sediments in the Posses catchment, municipality of Extrema, state of Minas Gerais, Brazil, throughout the fingerprinting technique and portable X-ray fluorescence. Samples from soils under agriculture, pasture, and roads; and from the subsoil of theses land uses were taken in a widespread and representative manner from the […]

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Establishing environmental soil phosphorus thresholds to decrease the risk of losses to water in soils from Rio Grande do Sul, Brazil

Luciano Colpo Gatiboni ORCID logo , Rodrigo da Silveira Nicoloso ORCID logo , Gilmar Luiz Mumbach ORCID logo , Abelino Anacleto de Souza Junior ORCID logo , Daniel João Dall’Orsoletta ORCID logo , Djalma Eugênio Schmitt ORCID logo , [...]

17/ago/2020

ABSTRACT The overloading of soil with manure or mineral fertilizers enhances phosphorus (P) availability, promoting its loss to water bodies and increasing the risk of eutrophication. In this sense, the establishment of an environmental P threshold is a simple and useful tool to classify soils regards its risk of P losses. Here we propose a P-threshold for soils from the state of Rio Grande do Sul (RS) in Brazil, with the soil clay content as the principal variable of the […]

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Long-term wheat-soybean successions affecting the cover and soil management factor in USLE, under subtropical climate

Tiago Stumpf da Silva ORCID logo , Elemar Antonino Cassol ORCID logo , Renato Levien ORCID logo , Flávio Luiz Foletto Eltz ORCID logo , Marcelo Raul Schmidt ORCID logo

07/ago/2020

ABSTRACT Vegetation cover and soil management influence the magnitude of soil losses. In the Universal Soil Loss Equation (USLE), cover and management are represented by the C factor, as it is the easiest factor to manage to reduce loss of soil and water in agricultural areas. This study aimed to determine the C factor of a succession of wheat (Triticum aestivum L.) followed by soybean (Glycine max) under conventional tillage, reduced tillage, and no-tillage. For this, data of soil losses […]

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Soil loss as a desertification risk indicator: mapping and simulation in the Salitre River Sub-Basin, Northeast Brazil

Márcio Lima Rios ORCID logo , Alisson Jadavi Pereira da Silva ORCID logo , Vagson Luiz Carvalho-Santos ORCID logo

26/maio/2020

ABSTRACT Discussions on desertification frequently highlight soil erosion as a striking feature of this phenomenon. In particular, the high spatial density of gullies represents a strong indication of the formation of desertification hotspots. In this study, through field activities and Monte Carlo simulations, we estimated the volume of soil loss by linear erosion on the slopes of the middle course of the Salitre river in the North of Bahia State. This estimative contributes to the recognition of a desertification process […]

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Nitrous oxide emissions from a tropical Oxisol under monocultures and an integrated system in the Southern Amazon – Brazil

Alexandre Ferreira do Nascimento ORCID logo , Renato de Aragão Ribeiro Rodrigues ORCID logo , Julia Graziela da Silveira ORCID logo , Jacqueline Jesus Nogueira da Silva ORCID logo , Vagner de Carvalho Daniel ORCID logo , Eduardo Reckers Segatto ORCID logo

24/abr/2020

ABSTRACT Although agriculture and livestock systems represent important sources of N2O from the soil, they may also aid in emissions mitigation, mainly when integrated systems are taken into account, such as crop-livestock-forest, for food production. This work assessed the soil N2O emissions from a tropical Oxisol under row-crop, livestock, forest monocultures, and an integrated crop-livestock-forest system in the Southern Amazon – Brazil. Soil N2O emissions were measured using static chambers from November 2014 to October 2016 in four soil use […]

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