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Oecologia

, Volume 176, Issue 2, pp 581–594 | Cite as

Comparing integrated stable isotope and eddy covariance estimates of water-use efficiency on a Mediterranean successional sequence

  • Andrea ScartazzaEmail author
  • Francesco Primo Vaccari
  • Teresa Bertolini
  • Paul Di Tommasi
  • Marco Lauteri
  • Franco Miglietta
  • Enrico Brugnoli
Ecosystem ecology - Original research

Abstract

Water-use efficiency (WUE), thought to be a relevant trait for productivity and adaptation to water-limited environments, was estimated for three different ecosystems on the Mediterranean island of Pianosa: Mediterranean macchia (SMM), transition (STR) and abandoned agricultural (SAA) ecosystems, representing a successional series. Three independent approaches were used to study WUE: eddy covariance measurements, C isotope composition of ecosystem respired CO2, and C isotope discrimination (Δ) of leaf material (dry matter and soluble sugars). Seasonal variations in C–water relations and energy fluxes, compared in SMM and in SAA, were primarily dependent on the specific composition of each plant community. WUE of gross primary productivity was higher in SMM than in SAA at the beginning of the dry season. Both structural and fast-turnover leaf material were, on average, more enriched in 13C in SMM than SAA, indicating relatively higher stomatal control and WUE for the long-lived macchia species. This pattern corresponded to 13C-enriched respired CO2 in SMM compared to the other ecosystems. Conversely, most of the annual herbaceous SAA species (terophytes) showed a drought-escaping strategy, with relatively high stomatal conductance and low WUE. An ecosystem-integrated Δ value was weighted for each ecosystem on the abundance of different life forms, classified according to Raunkiar’s system. Agreement was found between ecosystem WUE calculated using eddy covariance and those estimated using integrated Δ approaches. Comparing the isotopic methods, Δ of leaf soluble sugars provided the most reliable proxy for short-term changes in photosynthetic discrimination and associated shifts in integrated canopy-level WUE along the successional series.

Keywords

Abandoned agriculture Carbon isotope discrimination Carbon–water relations Drought Life forms 

Notes

Acknowledgments

The authors are grateful to the PianosaLAB project, to the Director of the Porto Azzurro jail of the Ministry of Justice and to the National Park of the Tuscan Archipelago. Special thanks are due to Filippo Di Gennaro, Alessandro Matese, Jacopo Primicerio, Francesco Sabatini, Piero Toscano and Alessandro Zaldei, for their contribution in maintaining the eddy covariance towers, and to Luciano Spaccino, for skilful assistance in plant and air collections and for the accurate execution of the isotope-ratio mass spectrometry analyses. We thank the editor and two anonymous reviewers for their extremely constructive comments on the manuscript. This research was partially funded by the EU project CarboEurope IP (GOCE-CT-2003-505572) and partially by the Consiglio Nazionale delle Ricerche NITCAR project.

Supplementary material

442_2014_3027_MOESM1_ESM.pdf (235 kb)
Supplementary material 1 (PDF 235 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Andrea Scartazza
    • 1
    • 5
    Email author
  • Francesco Primo Vaccari
    • 2
  • Teresa Bertolini
    • 3
  • Paul Di Tommasi
    • 4
  • Marco Lauteri
    • 5
  • Franco Miglietta
    • 2
    • 6
    • 7
  • Enrico Brugnoli
    • 8
    • 5
  1. 1.Istituto di Biologia Agro-ambientale e Forestale (IBAF)Consiglio Nazionale delle RicercheMonterotondo Scalo (RM)Italy
  2. 2.Istituto di Biometeorologia (IBIMET)Consiglio Nazionale delle RicercheFirenze (FI)Italy
  3. 3.Divisione Impatti sull’Agricoltura, Foreste ed Ecosistemi Naturali Terrestri (IAFENT)Centro Euro-Mediterraneo sui Cambiamenti Climatici (CMCC)Lecce (LE)Italy
  4. 4.Istituto per i Sistemi Agricoli e Forestali del Mediterraneo (ISAFoM)Consiglio Nazionale delle RicercheErcolano (NA)Italy
  5. 5.Istituto di Biologia Agro-ambientale e Forestale (IBAF)Consiglio Nazionale delle RicerchePorano (TR)Italy
  6. 6.FoxLab (Forest and Wood)Fondazione E. Mach-IasmaS. Michele all’Adige (TN)Italy
  7. 7.Laboratory of Ecohydrology, Faculté ENACÉcole Polytechnique FédéraleLausanneSwitzerland
  8. 8.Dipartimento Scienze del Sistema Terra e Tecnologie per l’AmbienteConsiglio Nazionale delle RicercheRoma (RM)Italy

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