Nonlinear and Quantum Optics

Optics and Spectroscopy

, Volume 112, Issue 2, pp 271-279

First online:

Water stress assessment of cork oak leaves and maritime pine needles based on LIF spectra

  • A. LavrovAffiliated withINOV-Inesc-InovaçãoInstitute of Material and Surface Science and Engineering
  • , A. B. UtkinAffiliated withINOV-Inesc-InovaçãoInstitute of Material and Surface Science and Engineering Email author 
  • , J. Marques da SilvaAffiliated withFaculty of Science, Department of Plant Biology and BioFIG, University of Lisbon
  • , Rui VilarAffiliated withInstitute of Material and Surface Science and EngineeringDepartment of Chemical and Biological Engineering, Instituto Superior Técnico
  • , N. M. SantosAffiliated withINOV-Inesc-Inovação
  • , B. AlvesAffiliated withINOV-Inesc-Inovação

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The aim of the present work was to develop a method for the remote assessment of the impact of fire and drought stress on Mediterranean forest species such as the cork oak (Quercus suber) and maritime pine (Pinus pinaster). The proposed method is based on laser induced fluorescence (LIF): chlorophyll fluorescence is remotely excited by frequency-doubled YAG:Nd laser radiation pulses and collected and analyzed using a telescope and a gated high sensitivity spectrometer. The plant health criterion used is based on the I 685/I 740 ratio value, calculated from the fluorescence spectra. The method was benchmarked by comparing the results achieved with those obtained by conventional, continuous excitation fluorometric method and water loss gravimetric measurements. The results obtained with both methods show a strong correlation between them and with the weight-loss measurements, showing that the proposed method is suitable for fire and drought impact assessment on these two species.