http://http://dspace.unitus.it:80 The DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material. Sat, 25 May 2013 14:18:04 GMT 2013-05-25T14:18:04Z http://hdl.handle.net/2067/2149 Title: Assessment of full carbon budget of Italy: the CarbIUS project Authors: Papale, Dario; Castaldi, Simona; Ciccioli, Paolo; Corona, Piermaria; Di Tizio, Alessandra; Masci, Alberto; Miglietta, Franco; Reichstein, Markus; Vannini, Andrea Abstract: Regional carbon balances, funded, for the Italian side, by the Italian Ministry of Environment in the context of a bilateral agreement to develop scientific collaborations in Global Change Research between Italy and USA signed in 2001. The two regions selected are Italy and Oregon-California; there are many similarities between these two regions (climate, vegetation, topography, population pressure, etc.) but, on other hand, there are also interesting contrasts in societal aspects like demography, land-use history and emissions. The main CarbIUS objectives are 1) the identification of spatial and temporal variability of carbon sources and sinks and the relative contribution of the different anthropogenic and biogenic components, 2) the impact of land use changes and human population dynamics on the carbon balance, 3) the quantification of the effects of climate and natural disturbances on the terrestrial carbon stocks and fluxes and 4) the application of new methodologies to investigate carbon metabolism at the plot, ecosystem and regional scale. In this paper will be presented the methodologies that we are using to assess the contribution of the different components to the full carbon budget, like carbon stocks and fluxes, disturbances (harvesting, wild forest fires and forest pathology), CH4 and NO2 fluxes and anthropogenic emissions. All these information will be input in a Data Assimilation System and the results will be validated using sub-regional airborne measurements of carbon fluxes. Fri, 31 Dec 2004 23:00:00 GMT http://hdl.handle.net/2067/2149 2004-12-31T23:00:00Z http://hdl.handle.net/2067/1776 Title: Soil organic carbon balance using Century model Authors: Di Tizio, Alessandra; Grego, Stefano Abstract: Mathematical modelling has widely been used during the last 20 years to estimate and predict soil organic carbon (SOC) balance and nutrients dynamic on the landscape scale. The model simulations are applied and developed to assess the long-term effects of climate and management practices on SOC in the different land use. However, there are characteristics of the models, such as simplifications, complex nonlinear interactions etc., which limit their use and imply wide evolution to improve the models performance. The present work illustrates the differences among the main SOC models developed for forest, agricultural and grassland land-use, and their limits and prospects. Particularly the CENTURY model and an application of this model in a Mediterranean agroecosystems, characterized by organic and conventional managements, are described. Mon, 31 Dec 2007 23:00:00 GMT http://hdl.handle.net/2067/1776 2007-12-31T23:00:00Z http://hdl.handle.net/2067/1942 Title: The effect of organic and conventional cropping systems on CO2 emission from agricultural soils: preliminary results Authors: Mancinelli, Roberto; Campiglia, Enio; Di Tizio, Alessandra; Lagomarsino, Alessandra; Grego, Stefano Abstract: The effects of different agricultural systems on soil organic carbon content and CO2 emission are investigated in this work. In a long-term experiment a conventional system, characterized by traditional agricultural practices (as deep tillage and chemical input) was compared with an organic one, including minimum tillage, green manure and organic fertilizers. Both systems have a three-year crop rotation including pea – durum wheat – tomato; the organic system is implemented with the introduction of common vetch (Vicia sativa L.) and sorghum (Sorghum vulgare bicolor) as cover crops. In the year 2006 (5 years after the experimentation beginning) was determined the soil C content and was measured the CO2 emissions from soil. The first results showed a trend of CO2 production higher in organic soils in comparison with conventional one. Among the two compared cropping systems the higher differences of CO2 emission were observed in tomato soil respect to the durum wheat and pea soils, probably due to the vetch green manuring before the tomato transplanting. These results are in agreement with the total organic carbon content and water soluble carbon (WSC), which showed the highest values in organic soil. The first observations suggest a higher biological activity and CO2 emission in organic soil than conventional one, likely due to a higher total carbon soil content. Sun, 31 Dec 2006 23:00:00 GMT http://hdl.handle.net/2067/1942 2006-12-31T23:00:00Z