Purposes: The aim of this paper was to characterize elements dynamics, including resorption before leaf shedding and accumulation/release during decompo sition, of two functionally diferent tree species, the N-fxing, broadleaf, deciduous black locust (Robinia pseudoacacia L.), and the Mediterranean black pine (Pinus nigra Arn.), planted on recent unconsolidated volcanic deposits. Methods: In two paired, 40 years old stands, we investigated the stoichiometry of thirteen elements in green leaves, newly shed leaf litter, stable litter resi due and soil. Results: Black locust leaves were richer in N, P, K, Mg and Mn; black pine needles were richer in Na, Fe, Zn, Cr, and Pb. Resorption efciency was Pb>Zn>Fe~N~Mn~Mg>Cd~K>P in black locust, and Pb~Cu>Zn~Na>Mn>K~Cr in black pine. Com pared to black pine, black locust newly shed litter was richer in K, Na, Mn, Cu, and Ni. During decomposi tion, black locust leaf litter released N, K, Mg, Na, Mn, Zn, Cu and Cd, and accumulated Fe, Ni, Cr and Pb, whilst black pine needles released N, Zn and Cd, and accumulated all the other elements. Compared to black locust black pine had a stable needle litter resi due richer in all elements but N, whilst the mineral soil was poorer in all elements but Pb. Conclusions: The two functionally diferent tree species have distinct element dynamics from leaf to far decomposed litter. Element sequestration in the stable residue of black pine litter, likely prevents their release in the mineral soil that is thus poorer in nutrients and minor elements compared to the soil of black locust.

Elements dynamics, from leaf to stable leaf litter residue and soil, for two functional types of tree planted on volcanic deposits

A. De Marco;
2022

Abstract

Purposes: The aim of this paper was to characterize elements dynamics, including resorption before leaf shedding and accumulation/release during decompo sition, of two functionally diferent tree species, the N-fxing, broadleaf, deciduous black locust (Robinia pseudoacacia L.), and the Mediterranean black pine (Pinus nigra Arn.), planted on recent unconsolidated volcanic deposits. Methods: In two paired, 40 years old stands, we investigated the stoichiometry of thirteen elements in green leaves, newly shed leaf litter, stable litter resi due and soil. Results: Black locust leaves were richer in N, P, K, Mg and Mn; black pine needles were richer in Na, Fe, Zn, Cr, and Pb. Resorption efciency was Pb>Zn>Fe~N~Mn~Mg>Cd~K>P in black locust, and Pb~Cu>Zn~Na>Mn>K~Cr in black pine. Com pared to black pine, black locust newly shed litter was richer in K, Na, Mn, Cu, and Ni. During decomposi tion, black locust leaf litter released N, K, Mg, Na, Mn, Zn, Cu and Cd, and accumulated Fe, Ni, Cr and Pb, whilst black pine needles released N, Zn and Cd, and accumulated all the other elements. Compared to black locust black pine had a stable needle litter resi due richer in all elements but N, whilst the mineral soil was poorer in all elements but Pb. Conclusions: The two functionally diferent tree species have distinct element dynamics from leaf to far decomposed litter. Element sequestration in the stable residue of black pine litter, likely prevents their release in the mineral soil that is thus poorer in nutrients and minor elements compared to the soil of black locust.
File in questo prodotto:
File Dimensione Formato  
Plant and soil 2022.pdf

solo utenti autorizzati

Tipologia: Versione Editoriale (PDF)
Licenza: Copyright dell'editore
Dimensione 573.54 kB
Formato Adobe PDF
573.54 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/901832
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 0
  • ???jsp.display-item.citation.isi??? 0
social impact