Erosion factors and magnetic susceptibility in differet compartments of a slope in Gilbués-PI, Brazil

Engenharia Agrícola

Hélio L. Santos²  José Marques Júnior¹  Sammy S. R. Matias²  Diego S. Siqueira¹  Marcílio V. Martins Filho¹ 

[1] ,Universidade Federal do Piauí Centro de Ciências Agrárias Teresina PI ,Brasil

关键词: indirect quantification;    geostatistics;    conservation planning;    compartments;    topography;    relief;    landscape;    quantificação indireta;    geoestatística;    planejamento conservacionista;    compartimentos;    topografia;    relevo;    paisagem;   

DOI  :  10.1590/S0100-69162013000100008

来源: SciELO

【 摘 要 】

The erosion is the degradation of soil with effects on crop productivity and pollution of the environment. To understand the spatial variability of this phenomenon, geostatistical techniques and concepts of soil-landscape can be used to identify landscape compartments with different potential of erosion. The aim of this study was to understand the factors of erosion in landscape compartments and the relations with the magnetic susceptibility (MS) of the soils in a slope in Gilbués, state of Piauí (PI), Brazil. Sampling meshes were set in compartments I and II with 121 points and in compartment III with 99 points spaced every 10 meters. There was significant difference to erodibility (K) and risk of erosion (RE); the spatial variability of MS was lower than the factors of soil erosion. The soil losses (A), the natural erosion potential (NEP), the RE and the MS had spatial relation with the topographic factor, indicating dependence of the erosion with the relief. We concluded that losses of soil, natural erosion potential and risk of erosion have spatial relation with the topographic factor, showing the dependence of the erosion factors with the relief. The soil magnetic susceptibility can be used as an auxiliary variable in the indirect quantification of the erodibility factor and the risk of soil erosion.

【 授权许可】

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