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- W2888218330 abstract "Southern Brazil is a region with a very intensive agriculture and the pressure on soil is considerably more intense than in the Amazonian region. Thus, it is necessary to study weathering processes as they control soil development and their environmental functions.In this context, this work aims to: (i) characterize the morphological, physical and chemical properties of weathering profiles developed in the absence, or with minimal human action; (ii) establish the geochemical and mineralogical evolution of soils in a subtropical environment; and (iii) assess the impact of anthropogenic actions on on the mineralogy of surface horizons. This study concerns soils of Rio Grande do Sul where the subtropical climate (T ~17°C and P ~1800mm/yr) favored the accumulation of organic matter and occurrence of 2:1 clay minerals in low proportion. The weathering indices (Weathering Intensity Scale - WIS and Chemical Index of Alteration - CIA) make it possible to classify the profiles according to their weathering intensity and their different mineralogical compositions (smectite, smectite + kaolinite, kaolinite).In the last chapter, the results show that after 12 years of cultivation under an integrated soybean–beef cattle production system, the ungrazed areas presented lower proportion of 2:1 minerals. The areas under intensive grazing and moderate grazing presented higher aluminization of the interlayer of 2:1 minerals. The higher aluminization under intensive and moderate grazing managements may be a drain of aluminum in the soil solid phase and possibly making it less available to plants and decreasing its phytotoxicity." @default.
- W2888218330 created "2018-08-31" @default.
- W2888218330 creator A5036082556 @default.
- W2888218330 date "2017-02-24" @default.
- W2888218330 modified "2023-09-28" @default.
- W2888218330 title "Mineralogical alteration in the soil of the south of Brazil : pedogenetic evolution and anthropic impact" @default.
- W2888218330 hasPublicationYear "2017" @default.
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