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| Boschi,Raquel Stucchi; Bocca,Felipe Ferreira; Lopes-Assad,Maria Leonor Ribeiro Casimiro; Assad,Eduardo Delgado. |
| ABSTRACT: The aim of this study was to evaluate the performance of pedotransfer functions (PTFs) available in the literature to estimate soil bulk density (ρb) in different regions of Brazil, using different metrics. The predictive capacity of 25 PTFs was evaluated using the mean absolute error (MAE), mean error (ME), root mean squared error (RMSE), coefficient of determination (R2) and the regression error characteristic (REC) curve. The models performed differently when comparing observed and estimated ρb values. In general, the PTFs showed a performance close to the mean value of the bulk density data, considered as the simplest possible estimation of an attribute and used as a parameter to compare the performance of existing models (null model). The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: REC curve; Model evaluation; Soil database; Tropical soil. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000100070 |
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| Cooper,Miguel; Boschi,Raquel Stucchi; Silva,Laura Fernanda Simões da; Toma,Raul Shiso; Vidal-Torrado,Pablo. |
| ABSTRACT: Knowledge of the hydraulic properties of the soil is of crucial importance to an understanding of the interactions between vegetation, soil and water. There is little information available about the hydraulic properties of Podzol soils found in tropical regions. The aim of this study was to present the soil morphology and hydraulic properties of a toposequence situated in a permanent plot at the Ilha do Cardoso State Park (Cananéia, SP, Brazil). Ultradetailed soil maps were used to define a toposequence inside the permanent plot. Five profiles, representing the main types of soil, were opened along the toposequence, in which Podzols are dominant. The levels of bulk density, sand content, porosity and permeability in these soils were all high.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Podzols; Soil morphology; Soil hydraulic properties. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000500393 |
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| Cooper,Miguel; Boschi,Raquel Stucchi; Silva,Vitor Boschi da; Silva,Laura Fernanda Simões da. |
| ABSTRACT Studies of soil porosity through image analysis are important to an understanding of how the soil functions. However, the lack of a simplified methodology for the quantification of the shape, number, and size of soil pores has limited the use of information extracted from images. The present work proposes a software program for the quantification and characterization of soil porosity from data derived from 2-D images. The user-friendly software was developed in C++ and allows for the classification of pores in terms of size, shape, and combinations of size and shape. Using raw data generated by image analysis systems, the software calculates the following parameters for the characterization of soil porosity: total area of pore (Tap), number of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil structure; Soil thin sections; Soil porosity data; Pore morphology. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000400388 |
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