Area Of Southeast Spain Research Articles

Effect of indigenous arbuscular mycorrhizal endophytes on the development of six wild plants colonizing a semi-arid area in south-east Spain.

The effect of arbuscular mycorrhizal fungi (AMF) an six plant species that frequently grow in areas of Mediterranean climate in south-east Spain was studied. In semi-arid soils, the most abundant AMF was Glomus aggregation Schenck and Smith, followed by Glomus mosseae (Nicol. and Gerd.) Gerd. and Trappe. The vascular plant species studied were Dittrichia viscosa (L.) W. Greuter (Asteraceae); Dactylis glomerata L., Piptatherum miliaceum (L.) Cosson, and Slipa tenacissima L. (Poaceae); Retama sphaerocarpa (L.) Boiss., and Ulex parviflorus Pourret (Fabaceae). Legumes were studied with single and dual symbiosis (Rhizobium and AMF). In a greenhouse experiment, inoculated plants developed better than noninoculared controls, as shown by dry weight and tissue N and P content. Plants inoculated with G. aggregation grew better than plants inoculated with G. mosseae. For this reason G. aggregatum was chosen for a field experiment, in which this AM fungus increased shoot dry mass, shoot length, and percent survival after transplantation. The effects of soil microorganisms on development, survival and fertility of native plants, their influence on the effects of the erosion, and their importance in plant repopulation programmes are discussed.

Hue image RGB colour composition. A simple technique to suppress shadow and enhance spectral signature

Abstract A hue image derived from three multi-spectral image bands by a RGB-IHS (red, green and blue to intensity, hue and saturation) transformation is shadow free because the pixel values in a hue image are independent of illumination and are related to only the shapes of the spectral signatures of the three bands. Three hue images derived from three different band triplets of a multi-spectral image, when displayed as a colour composite, form a strongly coloured, shadow-free image termed a hue red/green/blue (HRGB) colour composite image. The colours in this image are determined by the shapes of the spectral signatures of all the bands used and the spectral information of up to nine bands can be encoded into one colour image. Field checks and comparison with a published geological map have shown that geological interpretation of a HRGB image derived from a Landsat Thematic Mapper (TM) image of a semi-arid area in south east Spain accurately reveals the distribution of major rock types and hydrothermal a...