Abstract

LIMA, João Pedroso de; SIMOES, Nuno; REDONDO, Javier  and  LIMA, Isabel Pedroso de. Laboratorial Study of the Displacement of Seeds of Pinus pinea, Pinus pinaster and Grevillea sp. under Simulated Rain. Silva Lus. [online]. 2006, vol.14, n.2, pp.219-226. ISSN 0870-6352.

Reforestation plays an important role against soil erosion. However, seeds on sloping terrains can be displaced downslope by overland flow. This work presents a laboratory study on the movement of seeds of Pinus pinea, Pinus pinaster and Grevillea sp. over bare soil, caused by the combined action of simulated rainfall and drainage channel. The laboratory set-up used a rectangular soil flume and a rainfall simulator. The slope of the flume was set at 10, 20 and 30%. The rainfall events had a constant intensity and a fixed duration. Results show a relation between the seeds displacement distance and the physical characteristics of the seeds (e.g. weight of the seeds) and between that displacement and the slope.

Keywords : seeds; reforestation; overland flow; rainfall simulator.

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