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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

USE OF SCALED SEMIVARIOGRAMS IN THE PLANNING SAMPLE OF SOIL PHYSICAL PROPERTIES IN SOUTHERN AMAZONAS, BRAZIL

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Author(s):
de Aquino, Renato Eleoterio [1] ; Costa Campos, Milton Cesar [2] ; Marques Junior, Jose [1] ; de Oliveira, Ivanildo Amorim [1] ; Teixeira, Daniel De Bortoli [1] ; da Cunha, Jose Maurcio [2]
Total Authors: 6
Affiliation:
[1] Univ Estado Sao Paulo, Fac Ciencias Agr & Vet, Dept Solos & Fertilizantes, Jaboticabal, SP - Brazil
[2] Univ Fed Amazonas, Inst Educ Agr & Ambiente, Humaita, Amazonas - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Revista Brasileira de Ciência do Solo; v. 39, n. 1, p. 21-30, JAN-FEB 2015.
Web of Science Citations: 8
Abstract

There is a great lack of information from soil surveys in the southern part of the State of Amazonas, Brazil. The use of tools such as geostatistics may improve environmental planning, use and management. In this study, we aimed to use scaled semivariograms in sample design of soil physical properties of some environments in Amazonas. We selected five areas located in the south of the state of Amazonas, Brazil, with varied soil uses, such as forest, archaeological dark earth (ADE), pasture, sugarcane cropping, and agroforestry. Regular mesh grids were set up in these areas with 64 sample points spaced at 10 m from each other. At these points, we determined the particle size composition, soil resistance to penetration, moisture, soil bulk density and particle density, macroporosity, microporosity, total porosity, and aggregate stability in water at a depth of 0.00-0.20 m. Descriptive and geostatistical analyses were performed. The sample density requirements were lower in the pasture area but higher in the forest. We concluded that managed-environments had differences in their soil physical properties compared to the natural forest; notably, the soil in the ADE environment is physically improved in relation to the others. The physical properties evaluated showed a structure of spatial dependence with a slight variability of the forest compared to the others. The use of the range parameter of the semivariogram analysis proved to be effective in determining an ideal sample density. (AU)

FAPESP's process: 09/53368-0 - Impacts on land conversion of forest-use to agriculture in Southern Amazon
Grantee:José Marques Júnior
Support Opportunities: Regular Research Grants