Cambios geomorfológicos en barrancos por efecto de las repoblaciones forestales : el caso de los relieves degradados de la depresión noroccidental del Ebro

Geomorphological changes in gullies by the effect of afforestation: the case of the degraded areas of the Northwestem part of the Ebro Depression. Eight little basins in the northwestem part of the Ebro Depression (Spatn, La Rioja) have been selected, in a way that half of them have afforestation and the rest of them serve as a proof ofthe previous envinronmental state. Wechoose 29gullies, in wich has been made a sistematic samplig in the field in order to get geomorfological information and the density of the forest covert of the beds and the lúnitant talus. When analised statistically the data. we conclude that the coniferous afforestation development have a positive effect on the water cycle in the slopes and the hydromorjological behaviour of the gullies.