Estimate of the (R)USLE rainfall erosivity factor from monthly precipitation data in mainland Spain

The need for continuous recording rain gauges makes it difficult to determine the rainfall erosivity factor (R-factor) of the (R)USLE model in areas without good temporal data coverage. In mainland Spain, the Nature Conservation Institute (ICONA) determined the R-factor at few selected pluviographs, so simple estimates of the R-factor are definitely of great interest. The objectives of this study were: (1) to identify a readily available estimate of the R-factor for mainland Spain; (2) to discuss the applicability of a single (global) estimate based on analysis of regional results; (3) to evaluate the effect of record length on estimate precision and accuracy; and (4) to validate an available regression model developed by ICONA. Four estimators based on monthly precipitation were computed at 74 rainfall stations throughout mainland Spain. The regression analysis conducted at a global level clearly showed that modified Fournier index (MFI) ranked first among all assessed indexes. Applicability of this preliminary global model across mainland Spain was evaluated by analyzing regression results obtained at a regional level. It was found that three contiguous regions of eastern Spain (Catalonia, Valencian Community and Murcia) could have a different rainfall erosivity pattern, so a new regression analysis was conducted by dividing mainland Spain into two areas: Eastern Spain and plateau-lowland area. A comparative analysis concluded that the bi-areal regression model based on MFI for a 10-year record length provided a simple, precise and accurate estimate of the R-factor in mainland Spain. Finally, validation of the regression model proposed by ICONA showed that R-ICONA index overpredicted the R-factor by approximately 19%.

Algunos líquenes interesantes del Levante peninsular

Se citan algunos táxones liquénicos de la provincia de Valencia nuevos o interesantesparara la flora española: Arthothelium crozalsianum, A. spectabile, Bacidia beckhausii, Caloplaca pollinii, C. suberytraella, Catillaria nigroclavata, Lecidea erythrophaca, Micarea peliocarpa. Microglaena modesta, Pachyphiale cornea, Parmelia acetabulum, Phaeophyscia hirsuta, Schisrnatomma picconianum.

La Anunciación del Monasterio de Caleruega (Burgos): contextualización en la Baja Edad Media peninsular

La Anunciación del Monasterio de Santo Domingo de Caleruega, fundado por Alfonso X el Sabio, ha permanecido prácticamente olvidada por la historiografía nacional. Aislado tras los muros de la clausura, el grupo escultórico presenta una particularidad que, durante mucho tiempo, no fue analizada convenientemente: la Virgen está embarazada. La cantidad de ejemplos contabilizados de la misma naturaleza demuestra que esta clase de representaciones fue habitual, durante la Baja Edad Media, en algunos reinos de la península ibérica. Con un enfoque fundamentalmente iconográfico pero sin renunciar a otra clase de aproximaciones, el presente artículo pretende estudiar en profundidad la singularidad de la Anunciación calerogana que, al mismo tiempo, se convierte en el punto de partida para un análisis global de esta variante de la Salutación Angélica.