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C and N concentrations in different compartments of outgrown oak coppice forests under different site conditions in Central Italy |
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| Authors: | Giovanni Di Matteo Irene Tunno Pierfrancesco Nardi Paolo De Angelis Giada Bertini Gianfranco Fabbio |
| Institution: | 1. Consiglio per la Ricerca e la sperimentazione in Agricoltura–Research Unit for Climatology and Meteorology applied to Agriculture, CRA-CMA, 00186, Rome, Italy 2. Department of Agriculture, Forests, Nature and Energy, DAFNE, University of Viterbo, 01100, Viterbo, Italy 3. Department for Innovation in Biological, Agro-food and Forest systems, DIBAF, University of Viterbo, 01100, Viterbo, Italy 4. Consiglio per la Ricerca e la sperimentazione in Agricoltura, Forestry Research Centre, CRA-SEL, 52100, Arezzo, Italy |
| Abstract: | ContextHarvesting of Mediterranean oak coppice forests has been progressively suspended on a share of cover over the last decades. Positive growth trend in outgrown coppices no longer harvested on short rotations now drives natural forest restoration on wide areas, and it represents a potential carbon sink in view of global warming.AimsOur goals were to estimate carbon (C) and nitrogen (N) content per compartment in two deciduous oak outgrown coppice forests, aged differently and growing under unequal site quality, to verify whether C concentration across compartments is in agreement with the conventional conversion rate of 0.5.MethodsEcosystem C and N pools were assessed by multiplying the whole coppice mass (combining specific allometric functions, root-to-shoot ratio, and soil sampling) by respective C and N concentrations.ResultsThe results point out that the largest percentage of N was stored in 15-cm topsoil (84.06 and 73.34 % at the younger and older site, respectively), whereas the proportion of organic ecosystem C pool was more variable, as a consequence of the amount and allocation of phytomass. We found that, in most cases, C concentration was less than the conventional conversion rate of 0.5, especially in deadwood, O layer, and root compartments.ConclusionThe findings provide further knowledge of C and N storage into these new built-up forest types and the evidence that a detailed analysis may get higher accuracy in the pools estimate, producing a more reliable outlook on dynamics and climate change mitigation ability of these systems. |
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