Relação solo e paisagem na região sudeste da bacia Riacho do Tigre - PB

Abstract

Considering a large-scale landscape analysis for the Brazilian semiarid region, the relationship between soils and landscape is conditioned by climate and biome. In which the water regime is systematically pointed out as the main aspect that limits the development of soils in this region. However, on a detailed scale, it is possible to assess that the geological complexity of the semiarid region can be a factor that predominantly influences the modeling of the landscape, such as soil formation, as well as local climatic occurrences that can be inputs for the development of soils. In order to add perspectives on the distribution of soil classes as a function of the diversity of landscapes, this research encourages the use of the scale of detail for the analysis of soils in the semiarid as a function of lithology and geology. The study area corresponds to the southeastern region of the Riacho do Tigre-PB hydrographic basin, geographically limited by the coordinates 08º 04' 45” S and 36º 50' 52. The classification of the soils according to the description made in the field resulted in the identification of 5 first and third order classes. The classes are: typical dystrophic RED LATOSOL (P01), leptofragmentary eutrophic REGOLITHIC NEOSOL (P02), typical eutrophic REGOLITHIC NEOSOL (P03), humic eutrophic REGOLITHIC NEOSOL (P04) and typical eutrophic REGOLITHIC NEOSOL (P05). According to the granulometry data, ADA (Water Dispersed Clay), chemical and physical analysis data, the variation of coarse and fine material between the profiles showed indicators for lithological discontinuity identified by mapping. Thus, the results obtained present initial information about pedogenetic processes based on these spatial parameters.