[1] In order to establish suitability of forest ecosystems for long-term storage of C, it is necessary to characterize the effects of predicted increased atmospheric CO 2 levels on the pools and fluxes of C within these systems. Since most C held in terrestrial ecosystems is in the soil, we assessed the influence of Free Air Carbon Enrichment (FACE) treatment on the total soil C content (C total ) and incorporation of litter derived C (C new ) into soil organic matter (SOM) in a fast growing poplar plantation. C new was estimated by the C3/C4 stable isotope method. C total contents increased under control and FACE respectively by 12 and 3%, i.e., 484 and 107 gC/m 2 , while 704 and 926 gC/m 2 of new carbon was sequestered under control and FACE during the experiment. We conclude that FACE suppressed the increase of C total and simultaneously increased C new . We hypothesize that these opposite effects may be caused by a priming effect of the newly incorporated litter, where priming effect is defined as the stimulation of SOM decomposition caused by the addition of labile substrates.
The truffle crop is an empirical practice based on traditional conviction as truffle hunting does (GranettI, 2005). We wanted to start a trial to study the mystery tied to truffle finding in aim to check if the traditional convictions are in some way connected to scientific theory and experimental of the truffle cultivation. On the other hand, the underground economy needs more fiscal rules in order to improve collection of data of truffle productivity. The introduction of rules to extend the tax base by reducing avoidance and tax evasion has been a long term topic in the Italian Parliament (FIorIo, 2009; carluccI, 2008). The scientific reports on the amount of wild truffles harvested by spot of sample areas can't explain the "where, how and when" on all the land (SalernI, 2010), the same to determine soil characteristics (GardIn, 2005). Predicting truffle production based on forest site characteristics is required as happens in the mushroom situation (Palahì, 2009). The "know how" in the truffle debate mainly
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