Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | The role of forest type in the variability of DOC in atmospheric deposition at forest plots in Italy |
| Abstract | Dissolved organic carbon (DOC) was studied in atmospheric deposition samples collected on a weekly basis in 2005-2009 at 10 forest plots in Italy. The plots covered a wide range of geographical attributes and were representative of the main forest types in Italy. Both spatial and temporal variations in DOC concentrations and fluxes are discussed, with the aim of identifying the main factors affecting DOC variability. DOC concentration increased from bulk to throughfall and stemflow water samples at all sites, as an effect of leaching from leaves and branches, going from 0.7-1.7 mg C L-1 in bulk samples to 1.8-15.8 mg C L-1 in throughfall and 4.2-10.7 mg C L-1 in stemflow, with striking differences among the various plots. Low concentrations were found in runoff (0.5-2.0 mg C L-1), showing that the export of DOC via running waters was limited. The seasonality of DOC in throughfall samples was evident, with the highest concentration in summer when biological activity is at a maximum, and minima in winter due to limited DOC production and leaching. Statistical analysis revealed that DOC had a close relationship with organic and total nitrogen, and with nutrient ions, and a negative correlation with precipitation amount. Forest type proved to be a major factor affecting DOC variability: concentration and, to a lesser extent, fluxes were lower in stands dominated by deciduous species. The character of evergreens, and the size and shape of their leaves and needles, which regulate the interception mechanism of dry deposition, are mainly responsible for this. |
| Source | Environmental monitoring and assessment (Print) 184, pp. 3415–3425 |
| Keywords | ThroughfallStemflowDissolved organic carbonICP Forests |
| Journal | Environmental monitoring and assessment (Print) |
| Editor | Kluwer Academic Publishers, London, Paesi Bassi |
| Year | 2012 |
| Type | Articolo in rivista |
| DOI | 10.1007/s10661-011-2196-2 |
| Authors | Silvia Arisci; Michela Rogora; Aldo Marchetto; Federica Dichiaro |
| Text | 215472 2012 10.1007/s10661 011 2196 2 Throughfall Stemflow Dissolved organic carbon ICP Forests The role of forest type in the variability of DOC in atmospheric deposition at forest plots in Italy Silvia Arisci; Michela Rogora; Aldo Marchetto; Federica Dichiaro CNR Istituto per lo Studio degli Ecosistemi, I 28922 Verbania Pallanza Dissolved organic carbon DOC was studied in atmospheric deposition samples collected on a weekly basis in 2005 2009 at 10 forest plots in Italy. The plots covered a wide range of geographical attributes and were representative of the main forest types in Italy. Both spatial and temporal variations in DOC concentrations and fluxes are discussed, with the aim of identifying the main factors affecting DOC variability. DOC concentration increased from bulk to throughfall and stemflow water samples at all sites, as an effect of leaching from leaves and branches, going from 0.7 1.7 mg C L 1 in bulk samples to 1.8 15.8 mg C L 1 in throughfall and 4.2 10.7 mg C L 1 in stemflow, with striking differences among the various plots. Low concentrations were found in runoff 0.5 2.0 mg C L 1 , showing that the export of DOC via running waters was limited. The seasonality of DOC in throughfall samples was evident, with the highest concentration in summer when biological activity is at a maximum, and minima in winter due to limited DOC production and leaching. Statistical analysis revealed that DOC had a close relationship with organic and total nitrogen, and with nutrient ions, and a negative correlation with precipitation amount. Forest type proved to be a major factor affecting DOC variability concentration and, to a lesser extent, fluxes were lower in stands dominated by deciduous species. The character of evergreens, and the size and shape of their leaves and needles, which regulate the interception mechanism of dry deposition, are mainly responsible for this. 184 Published version Arisci et al EnvirMonitAssess 2012 DOC_Arisci_2012.pdf Articolo in rivista Kluwer Academic Publishers 0167 6369 Environmental monitoring and assessment Print Environmental monitoring and assessment Print Environ. monit. assess. Print Environmental monitoring and assessment. Print ARISCI SILVIA aldo.marchetto MARCHETTO ALDO michela.rogora ROGORA MICHELA TA.P02.014.002 Impatto dei cambiamenti globali sugli ecosistemi acquatici |