Abstract

DEL VALLE NEDER, Liliana; BUSNELLI, José  and  SAMPIETRO VATTUONE, María Marta. Increase of erosion and land degradation for anthropogenic actions and climatic variations, Tucumán. Rev. Asoc. Geol. Argent. [online]. 2010, vol.66, n.4, pp.499-504. ISSN 0004-4822.

Erosive processes reflect envi ronmental changes and extreme climatic events as intense storms. Natural vegetation coverage clearance, carried out by anthropic actions, generates discontinuities in landscape modeling. Unrestricted agricultural exploitation through massive deforestation during humid decades, has promoted soils degradation through erosive processes and nutrients losses decreasing topsoil productivity even though the implementation of direct sow in the last few years. The aims of this research were to analysis erosive processes, agricultural advances, and pluviometric variations at the northeast of Tucumán province. As geoindicators of erosive process acceleration on crop areas are: sheet runoff and erosion in convex surface, headwater erosion and b anthropogenic bankfull lateral walls in gullies and ravines. These erosive landforms are favored by silt loessic contents from high erodability soils in humid conditions. Erosive process cartography was done using aerial photographs of 1985 and 2001, and then, all data were digitalized using ILWIS (Integrated Land and Water Information System).

Keywords : Hydric erosion; Land degradation; Agricultural explotation; ILWIS; Climatic variations.

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