<?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%">Lai, Roberto</style></author><author><style face="normal" font="default" size="100%">Lagomarsino, Alessandra</style></author><author><style face="normal" font="default" size="100%">Ledda, Luigi</style></author><author><style face="normal" font="default" size="100%">Roggero, Pier Paolo</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Variation in soil C and microbial functions across tree canopy projection and open grassland microenvironments</style></title><secondary-title><style face="normal" font="default" size="100%">TURKISH JOURNAL OF AGRICULTURE AND FORESTRY</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">agroforestry systems</style></keyword><keyword><style  face="normal" font="default" size="100%">carbon mineralization</style></keyword><keyword><style  face="normal" font="default" size="100%">Enzyme activity</style></keyword><keyword><style  face="normal" font="default" size="100%">long-term management</style></keyword><keyword><style  face="normal" font="default" size="100%">Tree effect</style></keyword><keyword><style  face="normal" font="default" size="100%">vineyards</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2014</style></year></dates><publisher><style face="normal" font="default" size="100%">TUBITAK SCIENTIFIC &amp; TECHNICAL RESEARCH COUNCIL TURKEY</style></publisher><pub-location><style face="normal" font="default" size="100%">ATATURK BULVARI NO 221, KAVAKLIDERE, ANKARA, 00000, TURKEY</style></pub-location><volume><style face="normal" font="default" size="100%">38</style></volume><pages><style face="normal" font="default" size="100%">62-69</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Mixtures of grasslands and perennial woody crops or vineyards represent a major source of potential carbon storage or release. Understanding the spatial variability of soil properties in these ecosystems is important in determining soil constraints related to the management of soil resources. The aims of the study were 1) to explore the spatial variability associated to the trees for soil C storage and its components and reactivity; and 2) to assess the similarities between microenvironments in terms of microbial functional diversity. Eight microenvironments characterized by different long-term soil management practices and different positions with respect to woody plant canopy soil vertical projections were selected in a Mediterranean agropastoral system. Four management types were considered: pasture, hay crop, grass-covered vineyard, and tilled vineyard. Soil organic C, microbial biomass, and respiration were measured to assess C storage and dynamics, while functional diversity was determined by means of soil enzyme activities. The results showed that the microenvironmental variation of soil organic C and functional microbial diversity generated by the tree canopies in the wooded grassland can be very relevant for an accurate assessment of soil organic C content and its dynamics. The same was not applicable to vineyards, where the spatial variation of both soil organic C and functional diversity was negligible, independently of the soil management practices. These results suggest that in such systems the microscale spatial variability generated by the trees is worth of further investigation for improving our understanding of the long-term management effects on soil C dynamics.</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%">Simón, Nuria</style></author><author><style face="normal" font="default" size="100%">Montes, Fernando</style></author><author><style face="normal" font="default" size="100%">Díaz-Pinés, Eugenio</style></author><author><style face="normal" font="default" size="100%">Benavides, Raquel</style></author><author><style face="normal" font="default" size="100%">Roig, Sonia</style></author><author><style face="normal" font="default" size="100%">Rubio, Agustín</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Spatial distribution of the soil organic carbon pool in a Holm oak dehesa in Spain</style></title><secondary-title><style face="normal" font="default" size="100%">Plant and Soil</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">agroforestry systems</style></keyword><keyword><style  face="normal" font="default" size="100%">Soil C</style></keyword><keyword><style  face="normal" font="default" size="100%">Spatial variance partition</style></keyword><keyword><style  face="normal" font="default" size="100%">Tree effect</style></keyword><keyword><style  face="normal" font="default" size="100%">Universal Kriging</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2012</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2012///</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://www.springerlink.com/index/10.1007/s11104-012-1443-9</style></url></web-urls></urls><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Aims Dehesas are agroforestry systems characterized by scattered trees among pastures, crops and/or fallows. A study at a Spanish dehesa has been carried out to estimate the spatial distribution of the soil organic carbon stock and to assess the influence of the tree cover. Methods The soil organic carbon stock was estimated from the five uppermost cm of the mineral soil with high spatial resolution at two plots with different grazing intensities. The Universal Kriging technique was used to assess the spatial distribution of the soil organic carbon stocks, using tree coverage within a buffering area as an auxiliary variable. Results A significant positive correlation between tree presence and soil organic carbon stocks up to distances of around 8 m from the trees was found. The tree crown cover within a buffer up to a distance similar to the crown radius around the point absorbed 30 % of the variance in the model for both grazing intensities, but residual variance showed stronger spatial autocorrelation under regular grazing conditions. Conclusions Tree cover increases soil organic carbon stocks, and can be satisfactorily estimated by means of crown parameters. However, other factors are involved in the spatial pattern of the soil organic carbon distribution. Livestock plays an interactive role together</style></abstract></record></records></xml>