Resumen de Preserving and destroying soils, transforming landscapes: Soils and land-use changes in the Vallès County (Catalunya, Spain) 1853�2004
J.R. Olarieta, F.L. Rodríguez Valle, Enric Tello Aragay
In this paper we analyse the relations between land characteristics and land use, and their evolution in the Vallès county (Catalunya) since 1850. We reconstructed in digital format the 1850s cadastral maps of three villages (Caldes, Castellar, and Polinyà) and those made in 1950 of five villages (the previous three plus Sentmenat and Palau-Solità). For 1999 we used the available cadastral and land-use maps and conducted field surveys. We evaluated the suitability of land for the various agricultural uses (winter cereal, alfalfa, vineyard, olive, and almond orchards) considering the different land-use systems of 1850 and 1999. Forty to sixty percent of the land was more or less suitable for each of the land uses. Whilst in 1850 land used for agriculture was 46% of the total area and 29% was used for forest, these figures turned to 28% and 53%, respectively, by 1999. Urban and industrial areas now occupy 13% of the total land area and 47% of the best agricultural land. In 1850, 34% of the vineyards and 23% of the area with cereal crops were located on non-suitable or poorly suitable land for these uses. This shows a much more strict criterion for the location of cereal fields. But it also shows how the land-owning class tried to prevent further social conflicts by leasing their least suitable land for agriculture to the landless classes. In 1850 in the village of Caldes, 85% of the cereal fields were on slopes less than 20%, but 30% of the vineyards were on slopes of more than 30%, and sometimes up to 60�70%. Slopes protected with stone terraces occupied 700 ha, 43% of the land in agriculture in 1850, and 80% of that area was used for vineyards. Building of these terraces, which were generally small, required some 120,000 work days, and was undertaken on relatively soft geological materials while they disappear on the transition to competent geological materials. These results show that land characteristics influence land-use decision making and historical landscape changes. However, the extension of agriculture to non-suitable land in 1850 reflects deeper social conflicts, and required a vast labour investment in soil conservation by the poorest rural classes. The importance of terraces within this landscape and the land-use alternatives are also discussed.
