<?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></contributors><titles><title><style face="normal" font="default" size="100%">Organic farming has little effect on carbon stock in a Mediterranean dehesa (southern Spain)</style></title><secondary-title><style face="normal" font="default" size="100%">CATENA</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2014</style></year></dates><volume><style face="normal" font="default" size="100%">113</style></volume><pages><style face="normal" font="default" size="100%">9-17</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Understanding soil dynamics is essential for making appropriate land management decisions, as soils can affect the carbon content from the atmosphere, emitting large quantities of CO2 or storing carbon. This property is essential for climate change mitigation strategies as agriculture and forestry soil management can affect the car- bon cycle. The Mediterranean dehesa (Mediterranean grassland ecosystem with scattered oak trees — grazing systemwith Quercus ilex spp. ballota) is a silvopastoral systemthat integrates forestry, agricultural and livestock practices. The dehesa is characterized by the preservation of forest oaks that provide environmental services includingcarbon capture and storage.Thispaper showsthe relationships betweensoilproperties andsoil organic carbon (SOC) in two soil types: Cambisols (CM) and Leptosols (LP), with two management systems: organic farming (OF) for 20 years and conventional tillage (CT) in a Mediterranean dehesa of southern Spain without cropping. An analysis of 85 soil profiles was performed in 2009 in Los Pedroches Valley (Cordoba, southern Spain). TheSOCstock (SOC-S)was greater inCM(75.64 Mg ha−1)thaninLP(44.01 Mg ha−1). Physical parameters were themain variables affecting soil development. SOC-S was very similar in OF and CT (CM [74.90 Mg ha−1-CT; 76.39 Mg ha−1-OF] and LP [44.77 Mg ha−1-CT; 43.25 Mg ha−1-OF]). Data analysis showed that management practices had little effect on SOC storage in the study zone. Significant differences between soil types and manage- ment practiceswere found in SOC content for different horizons. The stratification ratiowas N2in bothsoils types (CM and LP) and management systems (OF and CT). These results indicate that the soil is of high quality, and that management practices have little influence on SOC-S in Los Pedroches Valley.</style></abstract></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>3</ref-type><contributors></contributors><titles><title><style face="normal" font="default" size="100%">EL SÍNDROME DE LA SECA EN MASAS DE QUERCUS SPP. EN ANDALUCÍA.</style></title><secondary-title><style face="normal" font="default" size="100%">III Congreso Forestal Español</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2001</style></year></dates><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">In Andalucia, the syndrome known as seca has weakened the Quercus forests with the following appearance of the syndrome’s spots in all its provinces. In order to determine the actual situation of the syndrome in the region a census of the damages caused by the seca has been elaborated. The information obtained from this census has made possible a territorial analysis of the damages in Andalucia that can be useful to define a biogeography of the seca, from a fitoclimatic or causal agents point of view. The interpretation of the information has made possible to characterize three large areas with similar characteristics concerning the syndrome’s incidence: Sierra Morena, the Cadiz-Malaga western sierra and the oriental region of Andalucia. In Sierra Morena and the Cadiz-Malaga western sierra the damages follow a pattern characterized by small to medium sized spots, with a medium to high percentage of affected trees, distributed in a random pattern, and dominance of gradual death of the trees. This reveals the progressive weakening of the forests, probably associated to the region’s tendency towards more arid fitoclimates. However, the Cadiz-Malaga western sierra differentiates due to the hi presence of cork trees (Quercus suber), that adds the cork harvesting practices, origin of many direct and indirect damages, to the incidence of the climatic factors. In the oriental region of Andalucia the pattern of damages differentiates in having larger spots, with a higher percentage of sudden death of trees, and distributed in areas with low water retention soils or where a high thermal accumulation is expected. In this case, the tendency towards more arid fitoclimates is more accented, with a higher incidence of heat-strokes</style></abstract></record></records></xml>