EDAFOLOGÍA, Vol 12. (2), pp 91-103, 2005
EFECTOS DE LA QUEMA CONTROLADA SOBRE MATORRAL EN LA EROSIÓN HÍDRICA, EL VALOR PASTORAL Y LAS PROPIEDADES DEL SUELO A LARGO PLAZO
E. AFIF KHOURI, J. A. OLIVEIRA PRENDES
Universidad de Oviedo. Departamento de Biología de Organismos y Sistemas. Escuela Universitaria de Ingenierías Técnicas – Campus de Mieres. Calle Gonzalo Gutiérrez de Quirós s/n. 33600 Mieres - Asturias (España). elias@uniovi.es
The soil losses by laminate erosion and the edaphic factors have been evaluated in a slo- ping segment of 2,68 ha of the “Tuña" woodland municipality of Tineo, affected for descending controlled burns of Erica and Ulex with a yield of 1,5 ha h-1. They were measured soil losses of 9,18, 18,84 and 11,82 t ha-1 año-1 before burning, to the 12 and 24 months respectively, showing the minimum influence of the pres- cribed fire in the hydrological answer. The soil alterations to the 6, 12, 18 and 24 months, took place to 0- 2, 2-5 and 5-10 cm of depth, showing the existence of an increment of the soil fertility. To the 6 and 12 months of the fire, clay fraction increased and sand it diminished and vice versa to the 18 months of the con- trolled burns. The pastoral value increased 37% to the 12 months of the burns, observing from there, a light decrease. The long term increase of fertility after the fire it could be taken advantage of by the vegetal cover result of the burned vegetation regrowth.
Key words: biodiversity, prescribed fire, soil analysis, soil degradation, USLE model.