<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Aranda, V.</style></author><author><style face="normal" font="default" size="100%">Oyonarte, C.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Characteristics of organic matter in soil surface horizons derived from calcareous and metamorphic rocks and different vegetation types from the Mediterranean high-mountains in SE Spain</style></title><secondary-title><style face="normal" font="default" size="100%">European Journal of Soil Biology</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">humic acids</style></keyword><keyword><style  face="normal" font="default" size="100%">Mediterranean environments</style></keyword><keyword><style  face="normal" font="default" size="100%">pine trees reforestations</style></keyword><keyword><style  face="normal" font="default" size="100%">soil organic matter quality</style></keyword><keyword><style  face="normal" font="default" size="100%">surface horizon</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2006</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2006///</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://linkinghub.elsevier.com/retrieve/pii/S1164556306000185</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">42</style></volume><pages><style face="normal" font="default" size="100%">247 - 258</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">A study was carried out on some basic characteristics of the organic matter in the surface horizons of soils from the two different geological (calcareous and acid metamorphic rocks) and ecological systems under a Mediterranean climate in Southeast Spain. The results show some noticeable differences in soil organic matter composition. This is likely due to typical Mediterranean climate and well adapted vegetation. There is a tendency towards a greater stability for the soil humus formed under slightly alkaline soil in comparison to the slightly acidic environment. The samples taken from the latter environment have a higher content in free organic matter, a lower content in total extractable humin and a greater relative proportion of aliphatic chains and lignin in the humic acids. The results also suggest some differences caused by the type of vegetation (forest and scrubland ecosystems) in the soil humus chemistry, with a more obvious negative effect under reforestations with species of Pinus in an acidic soil environment (a higher content in free organic matter, lesser presence of fungal-derived perylenequinonic pigments in the humic acids, and a higher content in little evolved forms of nitrogen and lignin in the humic acids). In general the organic matter under scrubland and Quercus vegetation is more decomposed and the humus is more evolved than under Pinus vegetation.</style></abstract><issue><style face="normal" font="default" size="100%">4</style></issue></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>5</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Aguilar, Juan A. Pascual</style></author><author><style face="normal" font="default" size="100%">Añó, Carlos</style></author><author><style face="normal" font="default" size="100%">Valera, Antonio</style></author><author><style face="normal" font="default" size="100%">Sánchez, Juan</style></author></authors><secondary-authors><author><style face="normal" font="default" size="100%">Kepner, William G.</style></author><author><style face="normal" font="default" size="100%">Rubio, Jose L.</style></author><author><style face="normal" font="default" size="100%">Mouat, David A.</style></author><author><style face="normal" font="default" size="100%">Pedrazzini, Fausto</style></author></secondary-authors></contributors><titles><title><style face="normal" font="default" size="100%">URBAN GROWTH DYNAMICS ( 1956-1998 ) IN MEDITERRANEAN COASTAL REGIONS : THE CASE OF ALICANTE , SPAIN</style></title><secondary-title><style face="normal" font="default" size="100%">Desertification in the Mediterranean Region a Security Issue</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Aerial photograph</style></keyword><keyword><style  face="normal" font="default" size="100%">desertification</style></keyword><keyword><style  face="normal" font="default" size="100%">Geographical information Systems.</style></keyword><keyword><style  face="normal" font="default" size="100%">Land degradation</style></keyword><keyword><style  face="normal" font="default" size="100%">Mediterranean environments</style></keyword><keyword><style  face="normal" font="default" size="100%">Soil sealing</style></keyword><keyword><style  face="normal" font="default" size="100%">Urban dynamics</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1998</style></year><pub-dates><date><style  face="normal" font="default" size="100%">1998///</style></date></pub-dates></dates><publisher><style face="normal" font="default" size="100%">Springer Netherlands</style></publisher><pages><style face="normal" font="default" size="100%">325 - 340</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Among factors causing soil degradation one of the most important, although less studied in Mediterranean environments, is the irreversible loss of soil due to urbanisation processes, inserted into the more general concept of soil sealing. In coastal Mediterranean regions, such as the Valencia Region, Spain, land cover transformations are mainly produced by contemporary socio-economic changes that have produced a drift from traditional agriculture to industrial and tourism economies, reinforced by population’s trends to concentrate in cities or larger urban regions. Evaluation of soil sealing is then a key element to understand soil degradation and the disappearance, in most cases, of highly productive soils. This work, inserted within a major study on land use-cover change and soil degradation of metropolitan areas in the Valencia Region, presents the preliminary results on the urban-non urban (open agrarian and natural spaces) dynamics in the municipality of Alicante, the second largest city in the region. Three sets of panchromatic air photos for the years 1956, 1985 and 1998 have been used. After air photo scanning, on screen digitising using a base digital topographic map at scale 1:10,000, was applied to extract two major types of soil cover: agrarian and urban. A Geographical Information System vector structure has been implemented for cartographic comparison. Finally, to identify spatial and temporal changes maps and overlays together with synthetic tables were produced in order to assess soil degradation. Results show that there has been a substantial loss of soil devoted mainly to agriculture. Urban growth can be differentiated into three distinct spatial patterns: 1) edge compact enlargement of the city boundaries, including growth following the main road network; 2) compact new urbanisation alongside the coast and 3) the colonisation by groups of individual residences mainly over continental open spaces. One of the main impacts of such new urban pattern has been the loss of the most fertile soils distributed over the alluvial plains around the city, which has been mainly occupied by the tourist and residential buildings</style></abstract><notes><style face="normal" font="default" size="100%">The following values have no corresponding Zotero field:&lt;br/&gt;periodical: Desertification in the Mediterranean Region a Security Issue</style></notes></record></records></xml>