|
|
|
| Registros recuperados: 10 | |
|
| |
|
|
| Moraes,André Geraldo de Lima; Carvalho,Daniel Fonseca de; Antunes,Mauro Antonio Homem; Ceddia,Marcos Bacis. |
| Abstract: The objective of this work was to evaluate the relationship between different remote sensing data, derived from satellite images, and interrill soil losses obtained in the field by using a portable rainfall simulator. The study was carried out in an area of a hydrographic basin, located in Médio Paraíba do Sul, in the state of Rio de Janeiro - one of the regions most affected by water erosion in Brazil. Evaluations were performed for different vegetation indices (NDVI, Savi, EVI, and EVI2) and fraction images (FI), derived from linear spectral mixture analysis (LSMA), obtained from RapidEye, Sentinel2A, and Landsat 8 OLI images. Vegetation indices are more adequate to predict soil loss than FI, highlighting EVI2, whose exponential model showed R2... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Linear spectral mixing analysis; Rainfall simulator; Vegetation indices. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000300332 |
| |
|
|
| Ceddia,Marcos Bacis; Anjos,Lúcia Helena Cunha dos; Lima,Eduardo; Ravelli Neto,Alexandre; Silva,Luiz Antonio da. |
| Foi instalado um experimento de longa duração (1989-1994) com cana-de-açúcar (variedade RB 739735) no município de Linhares, ES, com o objetivo de avaliar o efeito dos seguintes sistemas de colheita da cana-de-açúcar: a) Sistema Cana Crua - corte da cana sem queima, com posterior espalhamento do palhiço sobre o solo; e b) Sistema Cana Queimada - corte da cana com queima prévia do palhiço, sobre algumas propriedades físicas de solo Podzólico Amarelo em área de tabuleiro. O delineamento utilizado foi o de blocos casualizados, com seis repetições. Após seis anos de cultivo, constatou-se alteração do solo no sistema Cana Queimada, evidenciada pela diminuição do diâmetro médio ponderado dos agregados estáveis em água e pelo aumento da densidade do solo na... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Estabilidade de agregados; Densidade do solo; Saccharum officinarum; Manejo de colheita; Palhiço. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X1999000800019 |
| |
|
| |
|
|
| Lima,Sandra Santana; Ceddia,Marcos Bacis; Zuchello,Fernando; Aquino,Adriana Maria de; Mercante,Fábio Martins; Alves,Bruno José Rodrigues; Urquiaga,Segundo; Martius,Christopher; Boddey,Robert Michael. |
| Epigeous termite mounds are frequently observed in pasture areas, but the processes regulating their population dynamics are poorly known. This study evaluated epigeous termite mounds in cultivated grasslands used as pastures, assessing their spatial distribution by means of geostatistics and evaluating their vitality. The study was conducted in the Cerrado biome in the municipality of Rio Brilhante, Mato Grosso do Sul, Brazil. In two pasture areas (Pasture 1 and Pasture 2), epigeous mounds (nests) were georeferenced and analyzed for height, circumference and vitality (inhabited or not). The area occupied by the mounds was calculated and termite specimens were collected for taxonomic identification. The spatial distribution pattern of the mounds was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Termites; Isoptera; Geostatistics; Spatial distribution. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000100049 |
| |
|
|
| Machado,Roriz Luciano; Ceddia,Marcos Bacis; Carvalho,Daniel Fonseca de; Cruz,Eleandro Silva da; Francelino,Marcio Rocha. |
| Knowledge of maximum daily rain and its return period in a region is an important tool to soil conservation, hydraulic engineering and preservation of road projects. The objective of this work was to evaluate the spatial variability of maximum annual daily rain considering different return periods, at the Rio de Janeiro State. The data set was composed by historical series of 119 rain gauges, for 36 years of observation. The return periods, estimated by Gumbel distribution, were 2, 5, 10, 25, 50 and 100 years. The spatial variability of the return periods was evaluated by semivariograms. All the return periods presented spatial dependence, with exponential and spherical model fitted to the experimental semivariograms. The parameters of the fitted... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Runoff; Extreme rainfall; Geostatistics; Kriging. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052010000500009 |
| |
|
|
| Loureiro,Diego Campana; De-Polli,Helvécio; Ceddia,Marcos Bacis; Aquino,Adriana Maria de. |
| The objective of this work was to study the spatial variability of soil microbial biomass (SMB) and labile soil organic matter pools (labile SOM), under different management systems and plant cover. The experiment was conducted in a Haplic Planosol soil on an Integrated Agroecological Production System (SIPA), in Seropédica, Rio de Janeiro. The evaluated management systems were: alley cropping, pasture, and bush garden, the late one was used as reference area. Three grids of regular spacing of 2.5 x 2.5 meters were used for sampling, consisting of 25 georeferenced points each, where soil samples were taken at 0-10 cm depth. The following labile constituents of soil organic matter were determined: free light fraction (FLF), water soluble C and N, C and N of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Organic carbon; Geoestatistic; Glomalin; Precision agriculture. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052010000500010 |
| |
|
|
| Gomes,Andréa da Silva; Ferreira,Ana Carolina de Souza; Pinheiro,Érika Flávia Machado; Menezes,Michele Duarte de; Ceddia,Marcos Bacis. |
| ABSTRACT Computer models have been used to assess soil organic carbon (SOC) stock change. Commonly, models require to determine soil bulk density (Db), a variable that is often lacking in soil data bases. To partly overcome this problem, pedotransfer functions (PTFs) are developed to estimate Db from other easily available soil properties. However, only a few studies have determined the accuracy of these functions and quantified their effects on the final quality of the spatial variability maps. In this context, the objectives of this study were: i) to develop one PTF to estimate Db in soils of the Brazilian Central Amazon region; ii) to compare the performance of PTFs generated with three other models generally used to estimate Db in soils of the Amazon... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Içá Formation; Multiple linear regression; Ordinary kriging. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000600450 |
| |
|
|
| Ceddia,Marcos Bacis; Vieira,Sidney Rosa; Villela,André Luis Oliveira; Mota,Lenilson dos Santos; Anjos,Lúcia Helena Cunha dos; Carvalho,Daniel Fonseca de. |
| Among the soil formation factors, relief is one of the most used in soil mapping, because of its strong correlation with the spatial variability of soil attributes over a landscape. In this study the relationship between topography and the spatial variability of some soil physical properties was evaluated. The study site, a pasture with 2.84 ha, is located near Seropédica, Rio de Janeiro State, Brazil, where a regular square grid with 20 m spacing was laid out and georreferenced. In each sampling point, altitude was measured and undisturbed soil samples were collected, at 0.0-0.1, 0.1-0.2, and 0.2-0.3 m depths. Organic carbon content, soil texture, bulk density, particle density, and soil water retention at 10 (Field Capacity), 80 (limit of tensiometer... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Terrain elevation; Geostatistics; Soil physics; Cross semivariance. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000300009 |
| |
|
| |
| Registros recuperados: 10 | |
|
|
|
