Temporal dynamics of land use and cover in Paurá Lagoon region, Middle Coast of Rio Grande do Sul (RS), Brazil

Este trabalho investigou os efeitos da topografia e das práticas de uso e manejo do solo na variabilidade de alguns atributos do solo ao longo de três topossequências localizadas no planalto do Rio Grande do Sul. As topossequências (Tps) estão inseridas em uma bacia hidrográfica situada no município de Júlio de Castilhos. Na Tp1 foram definidos quatro pontos de amostragem e na Tp2 e Tp3, cinco pontos. Em cada perfil foram coletadas amostras em 5 camadas de solo (0‒5, 5‒10, 10‒20, 20‒40 e 40‒60 cm). Em laboratório foram determinados os atributos: densidade, argila, pH em água, carbono (C) orgânico total, fósforo (P) total, P orgânico total, P disponível, óxidos de ferro (Fe) e alumínio (Al) cristalinos e amorfos. Os resultados encontrados mostram que o movimento de sedimentos em superfície e através do perfil do solo é controlado pela posição, forma e declividade da encosta e, pelas atividades antrópicas como o uso e manejo do solo e aplicação de fertilizantes. Considerando as classes de uso da terra, os maiores teores de C e P (total, orgânico e disponível) foram obtidos na área úmida, seguido da lavoura e campo nativo. Considerando a posição na encosta os teores de C e P foram maiores na baixada seguido da base da encosta, topo e meia encosta. A condição hidromórfica ao longo das topossequências desempenhou um papel importante na disponibilidade de P, acúmulo C orgânico total e solubilização dos óxidos de Fe e Al. A B ST R A C TThis work investigated the effects of topography and land use and soil management practices on the variability of some soil properties along three toposequences located in the Rio Grande do Sul plateau, Southern Brazil. The toposequences (Tps) evaluated are from a watershed located in the municipality of Júlio de Castilhos. Soil samples were taken in four points in Tp1 and in five points in Tp2 and Tp3. In each point samples were taken at five depths (0‒5, 5‒10, 10‒20, 20‒40, and 40‒60 cm). The soil properties evaluated were soil density, clay, pH in water, total organic carbon (C), total phosphorus (P), total organic P, available P, and amorphous and crystalline iron (Fe) and aluminum (Al) oxides. Results show that the transport of sediments on the surface and through the soil profile is controlled by topographic position, landform, slope, and also by the anthropic activities such as the use and management of the soil and the application of fertilizers. Considering the classes of land use, the highest levels of C and P (total, organic and available) were obtained in the wetlands, followed by the crop fields and natural grasslands. Considering the topographic position, the contents of C and P were higher in the floodplain followed by the base of the slope, top and middle slope. Hydromorphic conditions along the toposequences played an important role in P availability, total organic C accumulation and solubilization of Fe and Al oxides.keywords: Land use, topographic position, soil profile, soil properties.

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Agricultural land use and cover change in the Cerrado/Amazon ecotone: A case study of the upper Teles Pires River basin

Acta Amazonica ◽

10.1590/1809-4392201701930 ◽

2018 ◽

Vol 48 (2) ◽

pp. 168-177 ◽

Cited By ~ 4

Author(s):

Ana Paula Sousa Rodrigues ZAIATZ ◽

Cornélio Alberto ZOLIN ◽

Laurimar Goncalves VENDRUSCULO ◽

Tarcio Rocha LOPES ◽

Janaina PAULINO

Keyword(s):

Land Use ◽

River Basin ◽

Large Scale ◽

Agricultural Land ◽

Temporal Dynamics ◽

Direct Conversion ◽

Landsat 8 ◽

Error Matrix ◽

Mato Grosso ◽

Land Use And Cover

ABSTRACT The upper Teles Pires River basin is a key hydrological resource for the state of Mato Grosso, but has suffered rapid land use and cover change. The basin includes areas of Cerrado biome, as well as transitional areas between the Amazon and Cerrado vegetation types, with intensive large-scale agriculture widely-spread throughout the region. The objective of this study was to explore the spatial and temporal dynamics of land use and cover change from 1986 to 2014 in the upper Teles Pires basin using remote sensing and GIS techniques. TM (Thematic Mapper) and TIRS (Thermal Infrared Sensor) sensor images aboard the Landsat 5 and Landsat 8, respectively, were employed for supervised classification using the “Classification Workflow” in ENVI 5.0. To evaluate classification accuracy, an error matrix was generated, and the Kappa, overall accuracy, errors of omission and commission, user accuracy and producer accuracy indexes calculated. The classes showing greatest variation across the study period were “Agriculture” and “Rainforest”. Results indicated that deforested areas are often replaced by pasture and then by agriculture, while direct conversion of forest to agriculture occured less frequently. The indices with satisfactory accuracy levels included the Kappa and Global indices, which showed accuracy levels above 80% for all study years. In addition, the producer and user accuracy indices ranged from 59-100% and 68-100%, while the errors of omission and commission ranged from 0-32% and 0-40.6%, respectively.

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Analysis of spatio-temporal dynamics of land use and cover changes in Western Kenya

Geocarto International ◽

10.1080/10106049.2019.1608594 ◽

2019 ◽

pp. 1-16 ◽

Cited By ~ 3

Author(s):

Benjamin Kipkemboi Kogo ◽

Lalit Kumar ◽

Richard Koech

Keyword(s):

Land Use ◽

Temporal Dynamics ◽

Western Kenya ◽

Spatio Temporal ◽

Land Use And Cover

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Soil management in Brazilian states: comparative analyzes of Physical and Monetary Soil Nutrient Balance in 2005 and 2015

Revista Agro mbiente On-line ◽

10.18227/1982-8470ragro.v14i0.6193 ◽

2020 ◽

Vol 14 ◽

Author(s):

Wladimir Colman De Azevedo Junior ◽

Marcos Rodrigues

Keyword(s):

Land Use ◽

Agricultural Production ◽

Nutrient Balance ◽

Soil Nutrient ◽

Soil Management ◽

Rio Grande ◽

Rio Grande Do Sul ◽

Biological Fixation ◽

Mato Grosso ◽

Annual Balance

Intensive agricultural production tends to stimulate the outflow of nutrients from the soil, requiring producers to properly manage the soil to avoid reducing fertility in the following crops. Thus, the objective was to estimate the annual monetary balance of nutrients in the soil of six Brazilian states that present the highest consumption of inorganic fertilizers in the years 2005 and 2015. The Annual Balance of Nutrients in Soil was used to calculate the physical and monetary balance of nutrients, in the main crops of these States, by quantifying the export of N, P, K from the soil by plants and the insertion of nutrients, through the application of fertilizers, fertigation, and biological fixation. The monetary balance of N, P and K added for the six states was positive and increased by 114% between 2005 and 2015, however, the balance of P for the state of Paraná was negative in 2015 reaching R$ 1,769.17. The balances and Mato Grosso, Rio Grande do Sul, and Paraná were higher concerning Goiás, São Paulo, and Minas Gerais. Except for Paraná, related to P, there was no positive depreciation of the associated NPK nutrients. The different flows, in the comparison among states, are caused by the different dynamics of land use, mainly in the size of the corn and soybean cultivation area.

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Land use changes after the period commodities rising price in the Rio Grande do Sul State, Brazil

Ciência Rural ◽

10.1590/0103-8478cr20160647 ◽

2017 ◽

Vol 47 (4) ◽

Cited By ~ 1

Author(s):

Vicente Celestino Pires Silveira ◽

◽

José Antonio González ◽

Eliana Lima da Fonseca ◽

◽

...

Keyword(s):

Land Use ◽

Atlantic Forest ◽

Rio Grande ◽

Raw Material ◽

Biodiesel Production ◽

World Population ◽

Rio Grande Do Sul ◽

Early 21St Century ◽

Pampa Biome ◽

The Impact

ABSTRACT: At the end of the 20th and early 21st century, agricultural systems incorporated definitively a new mission: to generate goods for a world population that continues to grow and whose way of life demand food with low environmental impact. Soybean is the main raw material for the production of biodiesel in Brazil, accountably responsible for 82.4% of the total produced between 2006 and 2013. The Brazilian state of Rio Grande do Sul (RS), which is formed by the Pampa and the Atlantic forest biomes, was responsible for 35.7% of the country's biodiesel production in the referred period. The aim of this paper was to verify the impact of the increased area of soybean cultivation in land use in Rio Grande do Sul State, in the period between 1990 and 2015, considering separately its two biomes (Pampa and Atlantic Forest) original areas, using both census dataset and satellite images. We used the period from 1990 to 2000 as before commodity rising price (BCRP) and the period from 2000 to 2013 as commodity rising price (CRP). The 505,162 ha from Atlantic Forest biome and 1,192,115ha from Pampa biome were added to soybean production in the CRP period. In the Atlantic Forest, this enlargement occurred in the border of the main production area, while in Pampa biome conversion of natural grassland to crop land was the main reason for the large increment in the cultivated area.

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Quantifying land use contributions to suspended sediment in a large cultivated catchment of Southern Brazil (Guaporé River, Rio Grande do Sul)

Agriculture Ecosystems & Environment ◽

10.1016/j.agee.2016.12.004 ◽

2017 ◽

Vol 237 ◽

pp. 95-108 ◽

Cited By ~ 21

Author(s):

Tales Tiecher ◽

Jean Paolo Gomes Minella ◽

Laurent Caner ◽

Olivier Evrard ◽

Mohsin Zafar ◽

...

Keyword(s):

Land Use ◽

Suspended Sediment ◽

Rio Grande ◽

Southern Brazil ◽

Rio Grande Do Sul

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RISCO DE INCÊNDIOS NA ESTAÇÃO ECOLÓGICA DO TAIM, RIO GRANDE DO SUL

Nativa ◽

10.31413/nativa.v8i1.8180 ◽

2020 ◽

Vol 8 (1) ◽

pp. 112

Author(s):

Juliana Marchesan ◽

Elisiane Alba ◽

Cristina Tabarelli ◽

Eliziane Pivoto Mello ◽

Dionatas Henrique Honnef ◽

...

Keyword(s):

Land Use ◽

Central Region ◽

Fire Risk ◽

Rio Grande ◽

Landsat 8 ◽

Rio Grande Do Sul ◽

Risk Class ◽

Radar Images ◽

In Fire ◽

Dynamic Variables

O objetivo deste trabalho foi realizar o mapeamento das áreas suscetíveis a ocorrência de incêndios na Estação Ecológica do Taim, Rio Grande do Sul. Para a obtenção das variáveis estáticas e dinâmicas, foram utilizadas imagens do satélite Landsat 8 e imagens de Radar para a determinação da topografia da área de estudo. Como variáveis dinâmicas utilizou-se a precipitação, temperatura e uso e cobertura da terra, enquanto que variáveis estáticas foram a hipsometria, declividade e distância das estradas. Cada variável foi estratificada e posteriormente ponderada numericamente quanto a sua suscetibilidade a ocorrência a incêndio. As variáveis dinâmicas e estáticas geradas foram integradas utilizando uma equação ponderada resultando no risco de incêndios para a área de estudo. A região central da Estação Ecológica do Taim apresentou maior suscetibilidade a incêndios, englobando a classe de alto risco, totalizando 4.219,56 ha (41,61%), enquanto as regiões periféricas apresentaram risco muito baixo a ocorrência de incêndios, abrangendo 5.419,35 ha (53,44%). As variáveis de maior contribuição à ocorrência de incêndios corresponderam ao uso e cobertura da terra e a temperatura, sendo as áreas de maior risco localizadas na parte central e próximo às estradas, nas quais estão ocupadas por campo nativo. Assim, esses locais devem ter maior atenção e recursos para combate de possíveis incêndios.Palavras-chave: Landsat 8; variáveis dinâmicas e estáticas; geoprocessamento. FIRE RISK AT THE ECOLOGIAL STATION OF TAIM, RIO GRANDE DO SUL ABSTRACT: The objective of this work was to map the areas susceptible to the occurrence of fires at the Taim Ecological Station, Rio Grande do Sul. In order to obtain the static and dynamic variables, Landsat 8 satellite images and Radar images were used to determine the topography of the study area. As dynamic variables were used the precipitation, temperature and land use and coverage, while static variables were hypsometry, slope and distance of roads. Each variable was stratified and numerically weighted as to its susceptibility to fire occurrence. The dynamic and static variables generated were integrated using a weighted equation resulting in fire risk for the study area. The central region of the Taim Ecological Station presented higher susceptibility to fires, encompassing the high risk class, totaling 4,219.56 ha (41.61%), while the peripheral regions had a very low risk of occurrence of fires, covering 5,419.35 ha (53.44%). The variables of greatest contribution to the occurrence of fires corresponded to the land use and land cover and the temperature, being the areas of greater risk in the central region and near the roads, in which they are occupied by the native field. Thus, these sites should have greater attention and resources to combat possible fires.Keywords: Landsat 8; dynamic and static variables; geoprocessing.

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Análise Temporal do Uso e Cobertura dos Solos no Município de São Jose dos Ausentes, Rio Grande do Sul, Brasil (Temporal Analysis of Use and Land Cover in the Municipality of São José dos Ausentes, Rio Grande do Sul, Brazil)

Revista Brasileira de Geografia Física ◽

10.26848/rbgf.v5i1.232749 ◽

2012 ◽

Vol 5 (1) ◽

pp. 18 ◽

Cited By ~ 1

Author(s):

Jussara Alves Pinheiro Sommer ◽

Dejanira Luderitz Saldanha

Keyword(s):

Land Use ◽

Land Cover ◽

Rio Grande ◽

Digital Processing ◽

Temporal Analysis ◽

Development Stage ◽

Native Forest ◽

Rio Grande Do Sul ◽

Livestock Farming ◽

Color Composite

Esta pesquisa apresenta o levantamento de dados sobre alterações no uso e cobertura dos solos na região denominada Campos de Cima da Serra, nordeste do RS, visando identificar as formações vegetais mais impactadas nos últimos vinte anos. Foram utilizadas imagens TM do satélite Landsat 5 dos anos de 1985 e 2009 e realizadas técnicas de processamento digital com a geração de imagens NDVI, composição colorida, imagem mudança, classificação supervisionada e a geração de mapas de uso e cobertura dos solos da região. Os dados levantados revelam a redução de 24,42% na classe mata nativa, entre os anos de 1985 e 2009. Na classe florestamento houve expansão de, aproximadamente, 514% em relação a 1985. Constata-se um decréscimo de 4,93% na área de campos em relação ao ano de 1985. Entretanto, é importante salientar que a extensão na área de campos, para o ano de 2009, pode ser menor devido à confusão espectral relacionada ao estágio de desenvolvimento de pinus s.p. sobre os campos. As alterações no uso e na cobertura dos solos nos últimos vinte e quatro anos no município de São José dos Ausentes indicam estratégias de manutenção das propriedades rurais frente às restrições econômicas e de manejo com a introdução de novos usos do solo. Os cultivos agrícolas de batata e o plantio de florestas exóticas (Pinus s.p) nos campos nativos consorciados às atividades tradicionais ligadas a pecuária extensiva, é uma estratégia dos proprietários contribuindo para a alteração da paisagem dos Campos de Cima da Serra.Palavras Chave: Sensoriamento remoto, análise temporal, usos e cobertura dos solos, Campos de Cima da Serra Temporal Analysis of Use and Land Cover in the Municipality of São José dos Ausentes, Rio Grande do Sul, Brazil ABSTRACTThis research presents the collection of data on changes in land use and land cover in the region called Campos de Cima da Serra, northeast of Rio Grande do Sul state, in order to identify the plant formations more impacted over the last twenty years. LANDSAT5 satellite images were used for the years 1985 and 2009 and digital processing techniques were performed resulting in NDVI imaging, color composite and change image, supervised classification, and generation of use and land cover maps of the region. The data collected show the decrease of 24.42% in native forest class, between the years 1985 and 2009. In foresting class there was expansion of approximately 514% compared to 1985. There is a decrease of 4.93% in the area of grasslands in relation to the year of 1985, however it is important to stress that the extension in the area of grasslands, for the year 2009, may be less due to spectral confusion related to the development stage of pinus s.p. over the fields. Changes in land use and cover over the past twenty-four years in the municipality of São José dos Ausentes indicate the strategies maintenance of rural properties facing the economic constraints and the stewardship with introduction of new uses of soil. Agricultural crops of potatoes and planting exotic forests (Pinus s. p) in native grassland linked to traditional activities associated to extensive livestock farming, is a proprietary strategy contributing to changing the landscape of Campos de Cima da Serra.Keywords: remote sensing, land use e land cover, Campos de Cima da Serra

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Real-time genomic surveillance during the 2021 re-emergence of the yellow fever virus in Rio Grande do Sul State, Brazil

10.1101/2021.07.16.452727 ◽

2021 ◽

Author(s):

Miguel de Souza Andrade ◽

Fabricio Souza Campos ◽

Aline Alves Scarpellini Campos ◽

Filipe Vieira Santos de Abreu ◽

Fernando Lucas Melo ◽

...

Keyword(s):

Yellow Fever ◽

Temporal Dynamics ◽

Yellow Fever Virus ◽

Rio Grande ◽

Public Health Emergency ◽

Fever Virus ◽

Southern Brazil ◽

Rio Grande Do Sul ◽

Complete Genomes ◽

Spatio Temporal

The yellow fever virus (YFV) re-emergence in Rio Grande do Sul, Brazil, raised big concerns and led the state to declare a Public Health Emergency of State Importance. Here, we generated near-complete genomes from the ongoing outbreak in Southern Brazil, aiming to better understand the phylogenetic aspects and also spatio-temporal dynamics of the virus. Our findings highlight the path and dispersion in Rio Grande do Sul and that YFV was reintroduced from Sao Paulo to the Rio Grande do Sul state through Parana and Santa Catarina states, at the end of 2020.

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Temporal dynamics of soil susceptibility to erosion in semiarid watersheds

Acta Scientiarum Agronomy ◽

10.4025/actasciagron.v43i1.51378 ◽

2021 ◽

Vol 43 ◽

pp. e51378

Author(s):

Camilo Vinícius Trindade Silva ◽

Eunice Maia de Andrade ◽

Luis Cesar de Aquino Lemos Filho ◽

Jacques Carvalho Ribeiro Filho ◽

Hermínio Sabino de Oliveira Júnior

Keyword(s):

Land Use ◽

Land Cover ◽

Soil Loss ◽

Temporal Dynamics ◽

Anthropogenic Activities ◽

Rio Grande ◽

Spatiotemporal Analysis ◽

Semiarid Region ◽

The Rich ◽

Over Time

The intensification of anthropogenic activities on soils contributes to soil loss through erosion. Moreover, the pattern of soil loss in the Cobra River watershed, located in the semiarid region of Rio Grande do Norte, is related to the history of land use and occupation, mainly from agriculture and the red ceramic industry, as well as the climatic seasonality of the region. Thus, the objective of this work was to identify the pattern of soil loss from the Cobra River microbasin in the state of Rio Grande do Norte. For this, the following analyses were performed: a survey of land use class areas for the years 1987, 1997, 2007 and 2017 as part of the Mapbiomas project; estimation of basin soil loss for these years; and quantification of areas of erosion vulnerability classes for this period. QGIS software was used to treat georeferenced data. According to the results, the land cover classes in the rich Cobra River microbasin fluctuated over time. Potential soil loss from the watershed increased from 1987 to 2017, with an increase of approximately 20 million megagrams of potentially erodible soil. The study of soil loss in a microbasin located in the Brazilian semiarid region should consider the variation in land cover over time, climatic seasonality and anthropic activity. To this end, it is important to use geotechnology and geoprocessing techniques to conduct a more robust spatiotemporal analysis.

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