INFLUENCIA DE LA LITOLOGÍA EN LAS CONSECUENCIAS DEL ABANDONO DE TIERRAS DE CULTIVO EN MEDIOS MEDITERRÁNEOS SEMIÁRIDOS

Abstract

The importance that the lands abandonment has had in Murcia in the last years, the effects that causes the abandonment, and the tests that they have been carried out in abandoned and degraded fields for his recovery, are analysed. In the two last decades, possibly, they have been abandoned in the region of Murcia 100.000 hectares, and these lands are located in soil areas very degraded and that they can be very affected by erosion processes. The experiences carried out in abandoned fields show very different answers in soils with calcareous and marls parent material. While the abandonment in calcareous soils, from a erosive point of view, it can be positive; in marls soils is very negative. In these last soils, in the best of the cases, must happen a period very delayed of years for his restoration; being it more frequent the appearance and extension of the processes and forms of erosion. It has been demonstrated as the addition of urban solid residues is a form very effective of regeneration of soils and vegetable cover in semi-arid Mediterranean conditions.