Buitrago Acevedo, M.F.

Groen, T.A.

Hecker, C.A.

Skidmore, A.K.

English

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Changes in thermal infrared spectra of plants caused by temperature and water stress : powerpoint

University of Twente Research Information

Changes in thermal infrared spectra caused by temperature and water stressMaria Fernanda Buitrago AcevedoThomas GroenChris HeckerAndrew SkidmoreDepartment of Natural ResourcesContext of this research1Spectral response of Alpine vegetation in Thermal Infrared0,4 0,6 0,8 1,0 1,4 2,0 3,0 6,0VisibleVIS Near InfraredNIRLong Wave InfraredLWIRMidwave InfraredMWIRShortwave InfraredMWIR8,0…Why emissivity in plants2WavelengthWavelengthEmissivityEmissivityVisible NIRLWIRLeaf pigments Cell structure Water contentLeaf BiochemicalsSWIRWater - cell structure – leaf biochemicalsCelluloseQuartzStarch MWIRFTIR Spectrometer (laboratory)3Bruker Vertex 70 and integrating sphereExperiment:4Start End6 months of water and temperature stressStart End3 months of water stressMeasurements: - Leaf Water Content: LWC = 100*(Ww-Wd)/Ww- Microstructure: Leaf thickness and cuticle thickness- TIR spectraExperiment:5WetDryAmbient ColdWetDryAmbient ColdRhododendron (sp.) Beech (Fagus sylvatica)Water control Temperature controlCWAWAD CDAWADTemperatureSoil water contentTemperatureTracking the same leavesSoil water contentVisual results:6ResultsWell wateredDryWarm Cold7 1457 63CWAWAD CDResults: Leaf Water Content (LWC)7Leaf Water Content (%)Results: Leaf thickness8Leaf Water Content (%)a a b c c cResults: Cuticle thickness9Rhododendron results10Wet / ambientDry / coldWet / coldDry / ambientWavelength (µm)P-value of a paired T-testRhododendron results11Wet / ambientDry / coldWet / coldDry / ambientMWIR LWIR0 months6 months6 months6 months6 monthsWavelength (µm)Results beech (F. sylvatica)12Dry treatmentWell watered treatmentDry treatment0 months3 months0 months3 monthsComparison: Rhododendron vs Beech13Dry treatmentBeech well wateredBeech dryRhododendron  well wateredRhododendron dry0 monthsAfter treatmentAfter treatmentDecreaseIncreaseMWIR LWIRResults beech (F. sylvatica)14Dry treatmentWell watered treatmentDry treatment0 months3 months0 months3 monthsMWIR LWIR15Possible causes:Ullah et al. (2013)WaterReflectance2.5Wavelength3 3.5 4 4.5 5 5.5MWIR and changes in LWC: LWIR: Changes generated by cuticle and cuticular waxes Photo from: Barthlott & Neinhuis (1997)Smooth, sunken nervatures.Photo from: Barthlott & Neinhuis (1998)Smooth surface, few crystals. F. sylvaticaPhoto from: Gulz, Prasad & Muller (1992)Photo from: Gulz, Prasad & Muller (1992)Rhododendron sp.Photo from: Hardin & Gensel (1982)Photo from: Hardin & Gensel (1982)Striated cuticleRugous cuticle and scales Stress change the TIR spectral behavior of plants. Cold and dry stress have similar responses (visual, LWC, cuticle and leaf thickness) Dry treatment cause changes in the 4-6µm region (MWIR), related with changes in LWC. TIR spectra shows differences between species in the range 7-12.5µm (LWIR), probably related with biochemistry and microstructure of the leaf, especially complexity of the cuticle.16Conclusions:

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Changes in thermal infrared spectra of plants caused by temperature and water stress : powerpoint

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