Assessing gas exchange, sap flow and water relations using tree canopy spectral reflectance indices in irrigated and rainfed Olea europaea L. (Articolo in rivista)

Type
Label
  • Assessing gas exchange, sap flow and water relations using tree canopy spectral reflectance indices in irrigated and rainfed Olea europaea L. (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/j.envexpbot.2013.10.008 (literal)
Alternative label
  • Marino G., Pallozzi E., Cocozza C., Tognetti R., Giovannelli A., Cantini C., Centritto M. (2014)
    Assessing gas exchange, sap flow and water relations using tree canopy spectral reflectance indices in irrigated and rainfed Olea europaea L.
    in Environmental and experimental botany
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Marino G., Pallozzi E., Cocozza C., Tognetti R., Giovannelli A., Cantini C., Centritto M. (literal)
Pagina inizio
  • 43 (literal)
Pagina fine
  • 52 (literal)
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  • http://www.sciencedirect.com/science/article/pii/S009884721300155X (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 99 (literal)
Rivista
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  • 10 (literal)
Note
  • ISI Web of Science (WOS) (literal)
  • Scopus (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Institute for Plant Protection, National Research Council, Via Madonna del Piano 10, 50019 Sesto Fiorentino, FI, Italy Dipartimento di Bioscienze e Territorio, Università degli Studi del Molise, Contrada Fonte Lappone, 86090 Pesche, IS, Italy Institute of Agro-Environmental and Forest Biology, National Research Council, Via Salaria km 29.300, 00015 Monterotondo Scalo, RM, Italy Trees and Timber Institute, National Research Council, Via Madonna del Piano 10, 50019 Sesto Fiorentino, FI, Italy (literal)
Titolo
  • Assessing gas exchange, sap flow and water relations using tree canopy spectral reflectance indices in irrigated and rainfed Olea europaea L. (literal)
Abstract
  • Diurnal and seasonal trends of leaf photosynthesis (A), stomatal conductance to water (gs) and water potential (?l), whole-plant transpiration and tree canopy spectral reflectance indices were evaluated in rainfed and well-watered (control) mature olive (Olea europaea L., cv. Leccino) trees. The objective was to evaluate whether photochemical reflectance index (PRI), water index (WI) and normalized difference vegetation index (NDVI) could be used for detecting plant functioning in response to seasonal drought. The measurements were made from March to November, repeated every four weeks during the drought period of the growing season. Rainfed trees were subjected to prolonged water deficit with soil water content ranging between ~30% and 50% than that of control. Consequently, there were significant differences in the diurnal trend of ?l, A, gs and sap flux density between treatments. Under severe drought, ?l ranged between ~-4.5MPa (predawn) and ~-6.4MPa (midday), A ranged between maximum morning values of ~6?molm-2s-1 and minimum late afternoon values of 2.5?molm-2s-1, gs was lower than ~0.03molm-2s-1 for most of the daily courses, whereas stem sap flux density reached maximum peaks of 2.1gm-2s-1 in rainfed plants. The diurnal trends of all these parameters fully recovered to the control level after autumn rains. PRI, NDVI, and WI of olive tree canopy assessed significantly the effects of drought on rainfed trees and their subsequent recovery. PRI resulted better correlated with A (r2=0.587) than with the other measured parameters, pooling together values measured during the whole growing season. In contrast, NDVI showed a stronger relationship with ?l (r2=0.668) and gs (r2=0.547) than with A (r2=0.435) and whole-plant transpiration (r2=0.416). WI scaled linearly as gs and ?l increased (r2=0.597 and r2=0.576, respectively) and, even more interestingly, a good correlation was found between WI and whole-plant transpiration (r2=0.668) and between WI and A (r2=0.640). Overall PRI and WI ranked better than NDVI for tracking photosynthesis, whereas WI was the most accurate predictive index of plant water status and whole-plant transpiration. This study, which is the first to our knowledge that combines diurnal and seasonal trends of leaf gas-exchange, whole-plant transpiration and reflectance indices, clearly shows that PRI and WI measured at the tree canopy can be used for fast, nonintrusive detection of water stress. © 2013 Elsevier B.V. (literal)
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