Abstract
The processes of sub superficial erosion or piping have a wide development in semiarid environment when the suitable characteristics for it happen. In the Region of Murcia 67 areas have been located where the presence of piping concerns a notable surface and whose evolution degree is very advanced. These areas often coincide with neogene-quaternary basins, of marly lithologie, and whose predominant soil use are old dryness culture fields, terraced and abandon today. In all the areas detailed morphologic studies have been realized and in 15 of them, soil samples at two depths (surface and 100 cm depth) were taken. Physic- chemist analysis have been carried out with the aim to study their characteristics and to establish possible formation reasons. From the morphologic point of view, the terraced importance stands out on having generated a hydraulic gradient and as the pipes depth usually coincides with the low terrace height. The results of the realized analyses show as the piping presence, in the majority of the areas, is linked to changes in the structure and soils texture at different depths (thinner textures in depth and lacking structure soils), and high exchangeable sodium percentage (superior at deeper levels) what favours the soil dispersion and the appearance of these processes. As practices of soil conservation, in areas with these characteristics, the terraced fields would be totally inadvisable, especially with high terraces, and its later abandon.
Highlights
From the morphologic point of view, the terraced importance stands out on having generated a hydraulic gradient and as the pipes depth usually coincides with the low terrace height
The results of the realized analyses show as the piping presence, in the majority of the areas, is linked to changes in the structure and soils texture at different depths, and high exchangeable sodium percentage what favours the soil dispersion and the appearance of these processes
The piping process in Murcia (S.E. Spain): II Effect of Physical Soil Properties
Summary
El término piping (erosión en tunel), definido por numerosos autores (Jones, 1981), se usa para describir los procesos de erosión subsuperficiales. Bermúdez (1985) hablaban de ellos en la Cuenca de Mula, en los alrededores de Campos del Río; López Bermúdez y Torcal Sainz (1986) localizan otra área en las cercanías de Mazarrón; López Bermúdez y Romero Díaz (1989) representaban en un mapa del Sureste peninsular, algunas áreas con procesos de piping en la Región; Arana et al (1992) citan un sector próximo a Fuente Librilla con existencia de procesos de piping y, más recientemente, Vandekerckhove et al, (2000) y Poesen et al, (2002) estudian en la cabecera del río Guadalentín un área con presencia importante de estos procesos. Aquí se analizan distintas áreas de la Región de Murcia, en las cuales los procesos de piping están muy extendidos. En ellas se han realizado análisis físico-químicos de los suelos para poder establecer algunas de sus causas de formación
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