%0 Journal Article
%T Why most agricultural terraces in steep slopes in semiarid SE Spain remain well preserved since their abandonment 50 years go?
%A Sol谷-Benet
%A A.
%A L芍zaro
%A R.
%A Domingo
%A R.
%A Cant車n
%A F.
%J Pirineos : Revista de Ecolog赤a de Montaˋa
%D 2010
%I Consejo Superior de Investigaciones Cient赤ficas
%X A large part of the agricultural terraces in mountain environments are abandoned, like those from the Filabres range in Almer赤a, SE Spain. While many of such terraces show signs of soil erosion (wall disruptions, surface crusts, pipes and gullies), others in steep slopes remain well preserved after 50 years since their abandonment and still seem to play an active role against soil erosion. In order to know both magnitude of soil erosion and controlling factors in different types of abandoned terraces, a rainfall simulation campaign with a portable sprinkler was carried out in 45 representative microsites. Runoff, derived-infiltration and sediment production were measured and their relationships to basic soil parameters (particle size distribution, pH, EC, organic matter content, aggregate stability), geomorphic position, and ground cover, were examined. Under the average applied rainfall intensity (48 mm/h, which represents a precipitation with a return period of 5 years in the area), narrow bench terraces from steep hillslopes, have larger infiltration values and deliver less sediments than large bank terraces in alluvial plains. The presence of stony pavement sieving crusts on narrow-bench terraces and also on un-terraced alluvial fans, play an essential armouring effect against soil erosion while favouring water infiltration. Considerations are made about the evolution of the different types of traditional terraces in the area under both past agricultural and present abandoned status, and also about possible uses under a sustainable land management policy. Una gran parte de las terrazas agr赤colas en zonas de monta a est芍n abandonadas, como las de la Sierra de los Filabres en Almer赤a, SE de Espa a. Si bien muchas de dichas terrazas muestran se ales de erosi車n h赤drica (destrucci車n de muros, encostramiento superficial, piping y c芍rcavas), otras en laderas con pendientes acusadas siguen bien conservadas tras 50 a os de abandono y da la impresi車n de que todav赤a juegan un papel activo contra la erosi車n del suelo. Con la finalidad de conocer tanto la magnitud de la erosi車n como sus factores causantes en distintos tipos de terrazas abandonadas, se llev車 a cabo una campa a de simulaci車n de lluvia con un aspersor port芍til en 45 sitios representativos de la vertiente Sur de la Sierra de los Filabres. En cada simulaci車n se midi車 la escorrent赤a y la producci車n de sedimentos, se calcul車 la infiltraci車n y se determinaron las relaciones de dichos par芍metros con los del suelo (granulometr赤a, pH, CE, materia org芍nica, CaCO3 y estabilidad de los agregados), con su posi
%K Rainfall simulation
%K infiltration
%K runoff
%K erosion
%K surface crust
%K Simulaci車n de lluvia
%K infiltraci車n
%K escorrent赤a
%K erosi車n
%K costra superficial
%U http://pirineos.revistas.csic.es/index.php/pirineos/article/view/103/103