<?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%">Chrenková, Katarína</style></author><author><style face="normal" font="default" size="100%">Mataix-Solera, Jorge</style></author><author><style face="normal" font="default" size="100%">Dlapa, Pavel</style></author><author><style face="normal" font="default" size="100%">Arcenegui, Victoria</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Long-term changes in soil aggregation comparing forest and agricultural land use in different Mediterranean soil types</style></title><secondary-title><style face="normal" font="default" size="100%">Geoderma</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Aggregate stability</style></keyword><keyword><style  face="normal" font="default" size="100%">Conventional tillage</style></keyword><keyword><style  face="normal" font="default" size="100%">Mean weight diameter</style></keyword><keyword><style  face="normal" font="default" size="100%">water repellency</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2014</style></year></dates><volume><style face="normal" font="default" size="100%">235-236</style></volume><pages><style face="normal" font="default" size="100%">290-299</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">The formation and stabilization of soil aggregates have a key role to play in adequate soil functioning. Aggregate stability (AS) is considered by some authors to be a property that provides information on soil quality. It's also a property that is highly influenced by land use and management. This study aims to identify the long-term changes in soil aggregation and related properties comparing forest and agricultural land use in Mediterranean calcareous soils. For the research, seven study sites with different soil characteristics located in Alicante Province (E Spain) were chosen to compare the overall effect of land use change from agriculture to forestry on soil aggregation. At every site, samples of the same soil type were collected from agricultural land (dry crops with conventional tillage management using ploughing), and nearby forest, where agriculture was abandoned between 20 and 50years ago. Selected physical and chemical properties like: texture, total content of aggregates (TCA), aggregate stability (AS), organic matter content (OM), carbonates, mean weight diameter (MWD) of aggregates and water repellency (WR) were analysed on the collected soil samples. As expected, in all soils, the AS was significantly lower in agricultural sites than in forest sites. But in some cases the differences were much higher than in others. In forest sites the AS varied between 46 and 82% while in agricultural sites it ranged between 14 and 45%. The results showed strong positive correlation of AS with OM. The lowest values of AS in forest areas were found in wettable sandy soils. The relative increase of AS in forest soils compared to agricultural land use ranged from 39 to 79%. These differences can be explained mainly by some soil properties, such as OM content, texture, and WR. In particular, the lower OM content and absence of WR are responsible for the lower values of AS in agricultural land use due to the long-term conventional tillage management. Soil WR was found in three of the sites, and its presence plays a key role in soil aggregation and its stability, especially for sandy soils. The MWD was in most cases higher in forest than in agricultural sites, except for two wettable sandy soils with the lowest initial AS. In the case of carbonates, no correlations were found with AS, and only in the group of sandy soils, significant positive correlations between carbonates and TCA and with MWD were found. In conclusion we can say that the prolonged use of conventional tillage management using ploughing has a strong influence on AS in all types of soils studied in this research. The recovery after decades of land use abandonment not only is dependent on how is the increase of soil OM content, but also is controlled by some soil properties such as the texture and the presence of WR. In some cases the presence of hydrophobic substances can play a key role in the formation and stabilization of soil aggregates, contributing to maintaining good levels of OM and avoiding higher levels of soil degradation.</style></abstract></record><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%">Parras-Alcántara, Luis</style></author><author><style face="normal" font="default" size="100%">Díaz-Jaimes, Luisa</style></author><author><style face="normal" font="default" size="100%">Lozano-García, Beatriz</style></author><author><style face="normal" font="default" size="100%">Fernández Rebollo, Pilar</style></author><author><style face="normal" font="default" size="100%">Moreno Elcure, Félix</style></author><author><style face="normal" font="default" size="100%">Carbonero Muñoz, María D</style></author></authors></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><keywords><keyword><style  face="normal" font="default" size="100%">Conventional tillage</style></keyword><keyword><style  face="normal" font="default" size="100%">Management practices</style></keyword><keyword><style  face="normal" font="default" size="100%">Organic farming</style></keyword><keyword><style  face="normal" font="default" size="100%">Quercus ilex</style></keyword><keyword><style  face="normal" font="default" size="100%">Soil organic carbon</style></keyword></keywords><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></records></xml>