Significance of bedrock as a site factor determining nutritional status and growth of maritime pine

Relationships between soil properties, foliar nutrients and growth were studied in 128 plots of Pinus pinaster established in soil over different types of bedrock in Galicia (NW Spain). Plots were classified into the following groups of bedrocks according to geological maps and samples: granitic rocks, quaternary sediments, quartzite and sandstone, slates and phyllites, biotitic schists, micaschists, gneiss and migmatites. Bedrock type significantly influenced exchangeable Ca, total N, soil depth, foliar N, P, Ca, K and Mg and site index. Bedrock was also related to elevation, temperature and slope, as a result of the distribution and geomorphology. Soils developed from biotitic schists, gneiss, migmatites and granitic rocks were the most favourable for tree growth. The poorest growth and most severe nutrient deficiencies were observed in soils developed from quaternary sediments, mica schists, phyllites and slates, quartzite and sandstone. Two regression models were developed to predict site index: a complete model explained 52% of the total variation in site index, and a model for granitic rocks explained 53% of the variation. Both indicated the importance of soil depth, elevation and foliar K and Ca as predictive variables. (C) 2014 Elsevier B.V. All rights reserved

Modelos de crecimiento y produccion en España: resumen histórico, ejemplos contemporaneos y perspectivas

In this paper we present a review of forest models developed in Spain in recent years for both timber and non timber production and forest dynamics (regeneration, mortality,..). Models developed are whole stand, size (diameter) class and individual-tree. The models developed to date have been developed using data from permanent plots, experimental sites and the National Forest Inventory. In this paper we show the different sub-models developed so far and the friendly use software. Main perspectives of forest modelling in Spain are presented.En el presente trabajo se presenta una revisión sobre los modelos forestales desarrollados en España durante los últimos años tanto para la producción maderable como no maderable y para la dinámica de los bosques (regeneración, mortalidad,..). Se presentan modelos tanto de rodal completo como de clases diamétricas y de árbol individual Los modelos desarrollados hasta la fecha se han desarrollado a partir de datos procedentes de parecelas permanentes, ensayos y el Inventario Forestal Nacional. En el presenta trabajo se muestran los diferentes submodelos desarrollados hasta la fecha asi como las plataformas informáticas que permiten utilizar de forma amigable los modelos. Se incluyen las principales perspectivas de desarrollo de la modelización forestal en España