Eletroquímica e carbono orgânico de um cambissolo húmico do planalto catarinense sob um sistema agroflorestal

Abstract

Inceptisols are undeveloped and characterized soil, generally, as very shallow, dystrophics and with physical limitations to agricultural use. Agroforestry systems (AFS) appear as an alternative agricultural production, which preserves the structure and soil quality. The aim of this study was to evaluate the effect of using agroforestry system on the electrochemical characteristics of a Inceptisol in the mountainous plateau region of Santa Catarina. The experimental area of 0.8 ha conducted in agroforestry system in the city of Curitibanos-SC. Has as treatments: SIFmate herb (SE), SIF-fruit (SF), and SIF-agriculture (SA), all beying deployed in October 2013, plus there is an area of natural vegetation (VN) considered as a witness. Random trenches were dug in each treatment to collect soil samples with altered structure in the depths 0,0-0,05 m and 0,05-0,20 m in the first half of 2014 and 2015 for determining the electrochemical properties: charge balancing (ΔpH), zero charge point (PZC), organic carbon (CO) and total organic matter (OM). Through the ΔpH it was found that the Inceptisol is electronegative, the surface of colloids showed negative charge, and low value of PCZ due to the large amount of organic matter (≈ 70 g kg-1 ). The diversity of plant species in agroforestry system kept the intrinsic chemical properties of the soil study, high content of organic matter, electronegativity of organo colloids and PCZ, but they contributed to the reduction of active acidity in the first year in the SIF-agriculture (SA) and SIF mate herb (SE).