Structural changes in latosols of the cerrado region: II - soil compressive behavior and modeling of additional compaction

Revista Brasileira de Ciência do Solo

Eduardo Da Costa Severiano²  Geraldo César De Oliveira¹  Moacir De Souza Dias Júnior¹  Katia Aparecida De Pinho Costa¹  Vinícius De Melo Benites¹  Silvio Marcos Ferreira Filho¹ 

[1] ,Federal Institute of Education, Science and Technology GoianoRio Verde Goiás ,Brazil

关键词: preconsolidation pressure;    beneficial pressure;    critical pressure;    degradation of agricultural soils;    particle-size-distribution;    pressão de preconsolidação;    pressão benéfica;    pressão crítica;    degradação do solo;    distribuição de partículas por tamanho;   

DOI  :  10.1590/S0100-06832011000300014

来源: SciELO

【 摘 要 】

Currently in Brazil, as in other parts of the world, the concern is great with the increase of degraded agricultural soil, which is mostly related to the occurrence of soil compaction. Although soil texture is recognized as a very important component in the soil compressive behaviors, there are few studies that quantify its influence on the structural changes of Latosols in the Brazilian Cerrado region. This study aimed to evaluate structural changes and the compressive behavior of Latosols in Rio Verde, Goiás, through the modeling of additional soil compaction. The study was carried out using five Latosols with very different textures, under different soil compaction levels. Water retention and soil compression curves, and bearing capacity models were determined from undisturbed samples collected on the B horizons. Results indicated that clayey and very clayey Latosols were more susceptible to compression than medium-textured soils. Soil compression curves at density values associate with edaphic functions were used to determine the beneficial pressure (σ b) , i.e., pressure with optimal water retention, and critical pressure (σcrMAC), i.e., pressure with macroporosity below critical levels. These pressure values were higher than the preconsolidation pressure (σp), and therefore characterized as additional compaction. Based on the compressive behavior of these Latosols, it can be concluded that the combined preconsolidation pressure, beneficial pressure and critical pressure allow a better understanding of compression processes of Latosols.

【 授权许可】

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