Spatial variability of soil erodibility in pastures and forest areas in the municipality of Porto Velho, Rondônia

“Erodibility” is a characteristic of the soil that represents susceptibility with which its particles from most superficial layer are taken and transported to lower places by erosive agents, causing environmental economic damages. This work estimated erodibility in pastures forest areas municipality Porto Velho-Rondônia. In field, three different types vegetation were selected, one brachiaria, another mombaça grass, third native forest. pastures, sampling mesh equal sizes was outlined (90 m x 60 m), forested area an approximate 50 regular spacing 10 between samples points for both areas. The done at crossing depth 0.0-0.2 m, composing 70 sample area, totaling 200 samples. Then, laboratory analyzes carried out determine texture followed fractionation sand, organic carbon estimate matter soil. factors calculated using indirect prediction models, then, univariate, geostatistical multivariate techniques applied. pastures’ environments differed environment. However, grass functions as intermediate environment being closer environment.
 Keywords: erodibility, factors, kriging, principal components.