SAMPLING DENSITY AND LANDSCAPE COMPLEXITY IN SOIL SURVEYS CARRIED OUT IN BRAZIL

Authors

  • Antonio José Wilman Rios Instituto Brasileiro de Geografia e Estatística
  • Huberto José Kliemann UFG
  • Virlei Álvaro de Oliveira Instituto Brasileiro de Geografia e Estatística
  • Paulo Klinger Tito Jacomine Universidade Federal Rural de Pernambuco

Keywords:

Soil survey, sampling density, landscape complexity

Abstract

This study aimed to contribute to the establishment of norms and criteria for future soil surveys, assessing soil sampling density data. Soil surveys from several environments in the Brazilian territory were selected and carried out in accordance with the National Soil Research Center (CNPS, Embrapa, Brazil) protocols. Soil surveys were grouped as generalized, intermediate and detailed levels. For the first one, thirteen exploratory surveys developed by the Radambrasil Project, reaching the five main Brazilian geographical areas, and one exploratory-recognition soil survey carried out by Embrapa (SNLCS), published in a 1:1.000.000 mapping scale, were used. For the intermediate level, selected soil surveys were divided in Group I and Group II, with mapping scales of 1:100.000 (Group I), 1:65.000 and 1:50.000 (Group II). Detailed soil surveys were made in Central West sites of the country, with mapping scales ranging from 1:10.000 to 1:4.000. The main results showed that on generalized, intermediate and detailed survey levels, average densities were of one sampling point (complete profile plus extra sample) per 146378 ha, 4448 ha and 29 ha, respectively. Sampling density was closely related to landscape complexity (number of polygons per area unit), but it was not correlated to area complexity (number of polygons or spots per area unit) on the soil maps.

KEY-WORDS: Soil survey; sampling density; landscape complexity.

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Published

2008-03-31

How to Cite

RIOS, A. J. W.; KLIEMANN, H. J.; OLIVEIRA, V. Álvaro de; JACOMINE, P. K. T. SAMPLING DENSITY AND LANDSCAPE COMPLEXITY IN SOIL SURVEYS CARRIED OUT IN BRAZIL. Pesquisa Agropecuária Tropical [Agricultural Research in the Tropics], Goiânia, v. 38, n. 1, p. 44–52, 2008. Disponível em: https://revistas.ufg.br/pat/article/view/3614. Acesso em: 24 aug. 2024.

Issue

v. 38, n. 1, Jan./Mar. 2008

Section

Research Article

License

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