Energia cinÃtica de gotas de chuva simulada e energia ultra-sÃnica na desagregaÃÃo de um Cambissolo / Simulated raindrop and ultrasonic energy on the aggregate disruption and splash erosion of a Cambisol

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

Water erosion of soil is the main cause of land degradation over the world. Aggregate disruption of soils due to impact of the raindrops, followed by the splash of soil particles, is the first phase of the water erosion. This work aimed to quantify aggregate disruption of a typic dystrophic HAPLIC CAMBISOL (CXbd) by the kinetic energy of simulated raindrops and ultrasonic energy; to compare both forms of energy; and to evaluate the effect of colliding angle of raindrops on the amount of splash. Undisturbed samples of A, Bi and C horizons were submitted to simulated raindrops, at 150 mm h-1, during 5, 8, 11, 16 and 21 minutes, corresponding to the return periods of 5, 10, 20, 50 and 100 years, at Lavras, MG. The samples were placed at 0% and 20% slopes. For the ultrasonic test, the samples were immersed in water and submitted to ultrasonic energy during 1, 5, 10, 20 and 30 seconds, corresponding to 0.13, 0.66, 1.32, 2.63 and 3.95 J mL-1 energy levels. Both raindrop and ultrasonic energy showed the same pattern of disruptive effect on all three horizon material. The C horizon material had larger amounts of splashed sediment, as compared to A and Bi horizon, which did not differ from each other. The splashed material had more sand particles and less silt and clay particles than the original samples. The colliding angle of raindrops did not affect the amount of splash. Finally, the use of ultra-sound seems to simulate adequately the phenomenon of aggregate disruption caused by the raindrops.

ASSUNTO(S)

erosÃo hÃdrica salpicamento aggregation agregaÃÃo ultra-sound splash erosion conservacao de solo e agua salpico water erosion ultra-som

ACESSO AO ARTIGO

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