Exportación de solutos desde diferentes usos del suelo. Estudio experimental en el Pirineo Central Español

Abstract

In the Aísa Valley Experimental Station nine different land-uses have been reproduced in closed plots, including cereal crop, meadows, fallow land, shifting agriculture, dense shrub cover and burnt shrub cover, among others. In this paper, solute concentration data from runoff yielded in each of the plots during two years (1996 and1997) are analysed. The results show the dramatic influence of human activites: The highest losses of nutrients are yielded by the fallow land, shifting agiculture and cerealplots. In contrast, dense shurb cover and meadows lose few nutrients, confirming the moderate outputs of both runoff and suspended sediment. Most of the exported dissolved solids are HCO; and Ca2+. Other nutrients are exported in very low quantities, in accordance with the poor nutrient content of the soil.