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DatoValore
TitleNITROGEN CYCLING AND MASS BALANCE FOR A FORESTED CATCHMENT IN THE ITALYAN ALPS. ASSESSMENT OF NITROGEN STATUS
AbstractDuring 1999-2001 the chemical composition and fluxes were measured in rainfall, throughfall, soil solution and stream water in a remote forested site in the Italian Alps. The analysis of temporal patterns revealed the differential behaviour of nitrogen and sulphur and suggested that different mechanisms controlled their flux. No important changes in sulphate concentration and fluxes emerged as the solution passed through the various components of the forest ecosystem, and temporal variations of SO4 in the soil solution and stream were likely driven by the physical process of dilution. The availability of nitrate and ammonia, by contrast, was drastically reduced as throughfall water entered the soil and passed through the mineral layers, irrespective of season. The calculated hydrochemical budget based on throughfall and soil solution N fluxes revealed that 80% N retention in the forest soil, corresponding to 12 kg ha1 yr1, despite a relatively high N deposition loading (15 kg ha1 yr1). Most of the leached nitrogen (90%) was in the organic form. Indicators of the N status of this ecosystem, such as C/N ratio in solid and solution phase of the soil and N foliage content as well as land use history were examined. Despite the strong N retention in the forested part of the catchment, the stream water N-NO3 levels were consistently above 10 lg l1 suggesting that the Val Masino catchment as a whole was less efficient in processing atmospheric N inputs. This contrasting N behaviour illustrates the role of landscape features, such as the soil cover and vegetation type, that is characteristic of an alpine catchment.
SourceBiogeochemistry (Dordrecht) 78, pp. 97–123
KeywordsBiological uptakeCritical loadDissolved organic nitrogenThroughfall
JournalBiogeochemistry (Dordrecht)
EditorNijhoff/Junk, Boston, Paesi Bassi
Year2006
TypeArticolo in rivista
DOI10.1007/s10533-005-3429-7
AuthorsBALESTRINI R.; DI MARTINO N.; VAN MIEGROET H.
Text42255 2006 10.1007/s10533 005 3429 7 ISI Web of Science WOS 000237568300006 Biological uptake Critical load Dissolved organic nitrogen Throughfall NITROGEN CYCLING AND MASS BALANCE FOR A FORESTED CATCHMENT IN THE ITALYAN ALPS. ASSESSMENT OF NITROGEN STATUS BALESTRINI R.; DI MARTINO N.; VAN MIEGROET H. IRSA U.O.S Brugherio Department of Aquatic, Watershed, and Earth Resources and Department of Forest, Range and Wildlife Sciences, Utah State University, 5230 Old Main Hill, Logan, UT 84322 5230, USA During 1999 2001 the chemical composition and fluxes were measured in rainfall, throughfall, soil solution and stream water in a remote forested site in the Italian Alps. The analysis of temporal patterns revealed the differential behaviour of nitrogen and sulphur and suggested that different mechanisms controlled their flux. No important changes in sulphate concentration and fluxes emerged as the solution passed through the various components of the forest ecosystem, and temporal variations of SO4 in the soil solution and stream were likely driven by the physical process of dilution. The availability of nitrate and ammonia, by contrast, was drastically reduced as throughfall water entered the soil and passed through the mineral layers, irrespective of season. The calculated hydrochemical budget based on throughfall and soil solution N fluxes revealed that 80% N retention in the forest soil, corresponding to 12 kg ha1 yr1, despite a relatively high N deposition loading 15 kg ha1 yr1 . Most of the leached nitrogen 90% was in the organic form. Indicators of the N status of this ecosystem, such as C/N ratio in solid and solution phase of the soil and N foliage content as well as land use history were examined. Despite the strong N retention in the forested part of the catchment, the stream water N NO3 levels were consistently above 10 lg l1 suggesting that the Val Masino catchment as a whole was less efficient in processing atmospheric N inputs. This contrasting N behaviour illustrates the role of landscape features, such as the soil cover and vegetation type, that is characteristic of an alpine catchment. 78 http //www.springerlink.com/content/4t617786q8452183/ Nitrogen cycling and mass balance for a forested catchment in the Italian Alps. Assessment of nitrogen status Biogeochemistry.pdf Articolo in rivista Nijhoff/Junk 0168 2563 Biogeochemistry Dordrecht Biogeochemistry Dordrecht Biogeochemistry Dordrecht Biogeochemistry. Dordrecht raffaella.balestrini BALESTRINI RAFFAELLA TA.P04.032.001 Funzionalita degli ecosistemi acquatici dinamica dei nutrienti, idromorfologia e habitat fluviali