<?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%">Francaviglia, Rosa</style></author><author><style face="normal" font="default" size="100%">Benedetti, Anna</style></author><author><style face="normal" font="default" size="100%">Doro, Luca</style></author><author><style face="normal" font="default" size="100%">Madrau, Salvatore</style></author><author><style face="normal" font="default" size="100%">Ledda, Luigi</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Influence of land use on soil quality and stratification ratios under agro-silvo-pastoral Mediterranean management systems</style></title><secondary-title><style face="normal" font="default" size="100%">Agriculture, Ecosystems &amp; Environment</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">C:N</style></keyword><keyword><style  face="normal" font="default" size="100%">mediterranean systems</style></keyword><keyword><style  face="normal" font="default" size="100%">Microbial biomass</style></keyword><keyword><style  face="normal" font="default" size="100%">Microbial quotient</style></keyword><keyword><style  face="normal" font="default" size="100%">Soil organic carbon</style></keyword><keyword><style  face="normal" font="default" size="100%">Stratification ratio</style></keyword><keyword><style  face="normal" font="default" size="100%">Total N</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2014</style></year></dates><publisher><style face="normal" font="default" size="100%">Elsevier B.V.</style></publisher><volume><style face="normal" font="default" size="100%">183</style></volume><pages><style face="normal" font="default" size="100%">86-92</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">a b s t r a c t A case study from north-eastern Sardinia (Italy) in semiarid conditions is presented. Agriculture is mainly extensive and markedly agro-silvo-pastoral, and is typical of similar areas of the Mediterranean basin. The following land uses at different levels of crop intensification were considered: tilled vineyard (TV), no-tilled grassed vineyard (GV), hay crop and pasture with sparse cork oaks (HC and PA), semi-natural systems (SN, former vineyards set-aside about 30 years ago), cork oak forest (Quercus suber L.) established in the past century (CO). Some soil quality parameters were considered: soil organic carbon (SOC) and total N (TN) concentrations, stocks and their stratification ratios with depth (SRs), microbial biomass carbon (MBC) and its quotient to SOC (qmic), and C:N ratios. Both in terms of concentrations and stocks, SOC and TN were generally higher in HC, PA, CO and SN: in these land uses SOC in the topsoil were in the range 17.0–24.3 g kg−1 and 48.9–65.4 t ha−1; TN values were 1.07–2.08 g kg−1 and 3.1–6.0 t ha−1. SOC and TN SRs under the CO land use were higher than 4, quite above the proposed threshold (?2), &gt;2 in GV, and ≥2.0 in PA. MBC in mg kg−1 and qmic in ?g g−1 were higher under CO (194 and 0.89) and GV (156 and 0.97). C:N ratios had optimum or nearly optimum (9–12) values in CO, PA and the GV, in agreement with the SRs, MBC and qmic. A positive and significant correlation was found between SOC and TN concentrations in all the land uses. ©</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%">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%">Francaviglia, Rosa</style></author><author><style face="normal" font="default" size="100%">Coleman, Kevin</style></author><author><style face="normal" font="default" size="100%">Whitmore, Andrew P.</style></author><author><style face="normal" font="default" size="100%">Doro, Luca</style></author><author><style face="normal" font="default" size="100%">Urracci, Giulia</style></author><author><style face="normal" font="default" size="100%">Rubino, Mariateresa</style></author><author><style face="normal" font="default" size="100%">Ledda, Luigi</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Changes in soil organic carbon and climate change – Application of the RothC model in agro-silvo-pastoral Mediterranean systems</style></title><secondary-title><style face="normal" font="default" size="100%">Agricultural Systems</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">C sequestration</style></keyword><keyword><style  face="normal" font="default" size="100%">climate change</style></keyword><keyword><style  face="normal" font="default" size="100%">CO2 emissions</style></keyword><keyword><style  face="normal" font="default" size="100%">Emission scenarios</style></keyword><keyword><style  face="normal" font="default" size="100%">land use</style></keyword><keyword><style  face="normal" font="default" size="100%">RothC</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://linkinghub.elsevier.com/retrieve/pii/S0308521X12000996</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">112</style></volume><pages><style face="normal" font="default" size="100%">48 - 54</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Due to the complexity of soil organic carbon (SOC), models have proved very useful in helping to improve our understanding of the soil–plant–atmosphere system. In this study we used the Rothamsted carbon model (RothC), which considers the effect of climate (temperature, rainfall and evaporation), soil texture (clay content) and crop management on the decomposition processes, to predict changes in SOC under different land uses and the different climate that may occur in the future. SOC turnover was evaluated in land uses under different levels of agricultural intensiﬁcation. The agriculture of the study-area is mainly extensive and markedly agro-silvo-pastoral, and is typical of northeastern Sardinia (Italy) and similar areas of the Mediterranean basin. The following land uses were considered: vineyards, hay crops, pastures, semi-natural systems (formerly vineyards) and cork oak forests. Since the study-area is characterized by the same soil type (Haplic Endoleptic Cambisols, Dystric) derived from granitic rocks and potential native vegetation (Quercus suber L.), this was considered as the model baseline to study soil organic carbon dynamics. Climate change scenarios for 90 yr were generated from the baseline climate with two Global Climate Models: GISS (Goddard Institute of Space Studies, USA), and HadCM3 (Met Ofﬁce, Hadley Centre, UK), for two of the Intergovernmental Panel on Climate Change (IPCC) emission scenarios (SRES A2 and B2). Land uses at low cropping intensity were more efﬁcient than intensive agricultural systems in terms of SOC storage in the order: hay crop &gt; pasture &gt; cork oak forest &gt; semi-natural systems. Land use change to vineyards decreased the carbon balance signiﬁcantly between 0.09 and 0.15 t C ha 1 yr 1 . However, former vineyards have almost recovered from soil disturbance following the establishment of the vineyards.</style></abstract><notes><style face="normal" font="default" size="100%">The following values have no corresponding Zotero field:&lt;br/&gt;publisher: Elsevier Ltd</style></notes></record></records></xml>