摘要：In semiarid regions, the main purpose of afforestation has been to provide a protective vegetative cover in orderto prevent or reduce soil erosion. This paper shows the results of a study carried out in some areas afforested in the 1970s, insteep slopes and mostly in marls. Afforestation where performed using terraced with subsoiling, so the existing scrub vegetationwas removed and Pinus halepensis was planted. The main conclusion is that human action developed in this semi-aridterritory, perhaps because the technique applied was not the most suitable for afforestation, has led to the geomorphologicalactivation of the slopes and the emergence and large development of gullies.
