Data/hora: 06/06/2024 08:05:57

Biblioteca(s): 	Embrapa Solos.	
Data corrente: 	26/06/2020	
Data da última atualização: 	26/06/2020	
Autoria: 	CORDEIRO, F. R.; CESÁRIO, F. V.; FONTANA, A.; ANJOS, L. H. C. dos; CANTO, A. C. B. do; TEIXEIRA, W. G.	
Afiliação: 	FERNANDA REIS CORDEIRO, UFRRJ; FERNANDO VIEIRA CESÁRIO, UFF; ADEMIR FONTANA, CNPS; LÚCIA HELENA CUNHA DOS ANJOS, UFRRJ; ANA CAROLINA BARBOSA DO CANTO, UFF; WENCESLAU GERALDES TEIXEIRA, CNPS.	
Título: 	Pedotransfer functions: the role of soil chemical properties units coversion for soil classification.	
Ano de publicação: 	2020	
Fonte/Imprenta: 	Revista Brasileira de Ciência do Solo, v. 44, e0190086, 2020.	
DOI: 	https://doi.org/10.36783/18069657rbcs20190	
Idioma: 	Inglês	
Conteúdo: 	Chemical soil analysis data can be expressed by weight (i.e., gravimetric basis) or volume (i.e., volumetric basis) of the fine earth (sieved >=2 mm), resulting in different units, cmolc kg-1 and cmolc dm-3, respectively. The research problem is that the difference between methods to express the same soil properties hinders the comparison of results and database or dataset standardization. This paper aims to develop pedotransfer functions (PTF) to obtain the density of fine earth, which will then be used for conversion data expressed in volumetric to gravimetric basis, or vice versa, that will be applied to compare results and to standardize databases with different units. Soils samples, including profiles of the main soil orders in Brazil such as Latossolos (Ferralsols or Oxisols)and Argissolos (Acrisols or Ultisols), from the states of Rondônia, Roraima, and Mato Grosso do Sul (132 horizons) were selected and weighed (in triplicate) to obtain the fine earth mass contained in a volume of 10 cm3. The mass values were used to calculate the fine earth density. Spearman's correlation analysis was used between the density and nine soil properties (coarse sand, fine sand, total sand, silt, clay, clay dispersed in water, clay dispersion, particle density, and organic carbon). The total sand, clay, and organic carbon showed the best correlations, therefore they were selected to construct the pedotransfer functions. Nonlinear regression techniques were used to obtain the models (PTFs) to predict density, which was used for unit conversion. As a result, the residual standard error (RSE) statistics of the models were: 0.0920, 0.1231, and 0.1633 g cm-3, respectively for PTF1 (using total sand as a predictor), PTF2 (using clay), and PTF3 (using organic carbon). Independent data was used to evaluate the accuracy of the models by residue analysis and the RSE. For the validation, the lowest RSE obtained was from the PTF1, so the best performance. Thus, to convert values of the chemical properties from a volumetric to gravimetric basis, the value must be divided by the predicted density. While, the conversion from gravimetric to volumetric basis requires that the value be multiplied by the predicted density. The PTFs using the properties total sand, clay, and organic carbon as predictor variables, allowed conversion of analytical data of soil samples expressed in the volumetric basis to gravimetric and vice versa, which can be used for dataset or database standardization.	
Palavras-Chave: 	Data standardization; Nonlinear regression; Padronização de dados; Regressão não linear.	
Thesagro: 	Análise do Solo.	
Thesaurus Nal: 	Soil analysis.	
Categoria do assunto: 	P Recursos Naturais, Ciências Ambientais e da Terra	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/214225/1/Pedotransfer-functions-the-role-of-soil-chemical-properties-units-coversion-for-soil-classification-2020.pdf	
Registro original: 	Embrapa Solos (CNPS)	
Exemplares: 	CNPS - (20484-1) - UPC - AP - DD -  -  -  - DIS