Soil characterization in a subtropical forest crossed by highways (Cantareira State Park, SP, Brazil)

eleven soil samples within the cantareira state park were analyzed to evaluate the traffic influence. for all soil samples total, partial and bioavailable concentration of (na, al, ca, mg, k, si, ti, mn, cr, ni, cu, zn, as, cd, pb) were determined. no influence from the highways in metals concentration in the soil could be observed up to sampling date. the only exception occurred in soil point 3 (high clay 64% and organic matter 6.4%), that presented higher concentration of cr (74.5 and 94.5 mg kg-1), ni (22.5 and 54.8mg kg-1), cu (83.8 and 121 mg kg-1), cd (1.28 and 1.74 mg kg-1) and as (2.04 and 2.67 mg kg-1), in fraction a (0-20 cm) and b (20-40 cm) respectively than the others ones, probably these elements came from other pollutant source. the availability sequence of the microelements in fraction a of the soil was as > cd > zn > cu > pb > ni > cr.