Spectral detection of stress-related pigments in salt-lake succulent halophytic shrubs

نویسندگان

  • Victoria A. Marchesini
  • Juan Pablo Guerschman
  • Ralf M. Schweiggert
  • Timothy D. Colmer
  • Erik J. Veneklaas
چکیده

The spectral detection of vegetation pigment concentrations has a high potential value, but it is still underdeveloped, especially for pigments other than chlorophylls. In this study, the seasonal pigment dynamics of two Tecticornia species (samphires; halophytic shrubs) from north-western Australia were correlated with spectral indices that best document the pigment changes over time. Pigment dynamics were assessed by analysing betacyanin, chlorophyll and carotenoid concentrations at plant level and by measuring reflectance at contrasting seasonal dates. Plant reflectance was used to define a new reflectance index that was most sensitive to the seasonal shifts in Tecticornia pigment concentrations. The two Tecticornia species turned from green to red-pinkish for the period March–August 2012 when betacyanins increased almost nine times in both species. Chlorophyll levels showed the opposite pattern to that of betacyanins, whereas carotenoid levels were relatively stable. Normalised difference indices correlated well with betacyanin (r = 0.805, using bands at 600 and 620 nm) and chlorophyll (r = 0.809, using bands

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عنوان ژورنال:
  • Int. J. Applied Earth Observation and Geoinformation

دوره 52  شماره 

صفحات  -

تاریخ انتشار 2016