<?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%">De Marco, Anna</style></author><author><style face="normal" font="default" size="100%">Arena, Carmen</style></author><author><style face="normal" font="default" size="100%">Giordano, Maria</style></author><author><style face="normal" font="default" size="100%">De Santo, Amalia Virzo</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Impact of the invasive tree black locust on soil properties of Mediterranean stone pine-holm oak forests</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%">C and N stocks</style></keyword><keyword><style  face="normal" font="default" size="100%">Exotic N-2-fixing tree</style></keyword><keyword><style  face="normal" font="default" size="100%">litter</style></keyword><keyword><style  face="normal" font="default" size="100%">organic layer and mineral soil</style></keyword><keyword><style  face="normal" font="default" size="100%">Water soluble C and N</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2013</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2013///</style></date></pub-dates></dates><volume><style face="normal" font="default" size="100%">372</style></volume><pages><style face="normal" font="default" size="100%">473 - 486</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Invasion by N-2-fixing species may alter biogeochemical processes. We hypothesized that the grade of invasion by the N-2-fixer black locust (Robinia pseudoacacia L.) could be related to the distribution and pools of carbon (C) and nitrogen (N) along the profile of two Mediterranean mixed forests of stone pine (Pinus pinea L.) and holm oak (Quercus ilex L.). A low-invaded (LIN) and a high-invaded (HIN) mixed forest were studied. We assessed: N concentration in green and in senescent leaves; C and N pools along the soil profile; seasonal changes of soluble C and N fractions, and microbial activity. Compared to coexisting holm oak and stone pine, black locust had higher N content in green and in senescent leaves. In the mineral soil: N stocks were similar in LIN and HIN; water soluble C and microbial activity, were lower in HIN compared to LIN; water soluble N showed seasonal changes consistent with tree growth activity in both HIN and LIN. In the organic layer of HIN, C and N stocks were about twofold larger than expected on the basis of stand density. Black locust increased C and N stocks in the upper organic layers that are more vulnerable to disturbance. However, it did not increase N stocks in the mineral soil.</style></abstract><issue><style face="normal" font="default" size="100%">1-2</style></issue><notes><style face="normal" font="default" size="100%">The following values have no corresponding Zotero field:&lt;br/&gt;pub-location: VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS&lt;br/&gt;publisher: SPRINGER</style></notes></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%">Marco, Anna</style></author><author><style face="normal" font="default" size="100%">Meola, Angela</style></author><author><style face="normal" font="default" size="100%">Maisto, Giulia</style></author><author><style face="normal" font="default" size="100%">Giordano, Maria</style></author><author><style face="normal" font="default" size="100%">Virzo De Santo, Amalia</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Non-additive effects of litter mixtures on decomposition of leaf litters in a Mediterranean maquis</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%">decomposition phases</style></keyword><keyword><style  face="normal" font="default" size="100%">fungal mycelium</style></keyword><keyword><style  face="normal" font="default" size="100%">individual litter in mixture</style></keyword><keyword><style  face="normal" font="default" size="100%">litter evenness</style></keyword><keyword><style  face="normal" font="default" size="100%">monospecific litter</style></keyword><keyword><style  face="normal" font="default" size="100%">sclerophylls vs mesophylls</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2011</style></year></dates><volume><style face="normal" font="default" size="100%">344</style></volume><pages><style face="normal" font="default" size="100%">305-317</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Many studies across a range of ecosystems have shown that decomposition in mixed litter is not predictable from single-species results due to synergistic or antagonistic interactions. Some studies also reveal that species composition and relative abundance may be more important than just richness in driving non-additive effects. Most studies on litter decomposition in Mediterranean maquis, an highdiversity shrubby ecosystem, have dealt exclusively with single species. In this study we investigated, at the individual-litter level, as well as at the littermixture level, the effect of litter mixing on decomposition of 3-species litter assemblages with different relative abundance of the component litters; we set up two types of litter assemblages that reflected the heterogeneity of bush cover in the inner maquis and at the edge maquis/gaps, as related to the leaf traits, i.e. sclerophylly vs mesophylly. We measured mass loss, decay of lignin, cellulose and ADSS (acid detergent soluble substances) and fungal mycelium ingrowth. The results show that over a 403-day incubation period, the decomposition of individual litters in mixtures deviated from that of monospecific litters and had different directions. In litter mixtures of the sclerophylls Phillyrea angustifolia and Pistacea lentiscus with the mesophyll Cistus, decomposition was lower than expected (antagonistic effect); in the mixtures of litters with similar physical structure (Ph. angustifolia and P. lentiscus with Quercus ilex) decomposition was faster than expected (synergistic effect). When considering the different decomposition phases, both negative and positive effects occurred in Quercus mixtures depending on the phase of decomposition. In both types of 3-species litter assemblages the greatest effect occurred in uneven mixtures rather than in even mixtures. Our results show that species composition drives the direction whilst the decomposability and the relative abundance drive the magnitude of non-additive effects of litter mixing on decomposition.</style></abstract></record></records></xml>