Asymmetry of leaf internal structure affects PLSR modelling of anatomical traits using VIS-NIR leaf level spectra

0580083 - ÚVGZ 2025 RIV IT eng J - Journal Article
Neuwirthová, E. - Lhotáková, Z. - Červená, L. - Lukeš, Petr - Campbell, P. - Albrechtová, J.
Asymmetry of leaf internal structure affects PLSR modelling of anatomical traits using VIS-NIR leaf level spectra.
European Journal of Remote Sensing. Roč. 57, č. 1 (2024), č. článku 2292154. E-ISSN 2279-7254
R&D Projects: GA MŠMT(CZ) LTAUSA18154
Institutional support: RVO:86652079
Keywords : co2 transfer conductance * absorption-spectra * optical-properties * chlorophyll-a * water-stress * reflectance * light * leaves * temperate * thickness * Planar leaves * leaf thickness * palisade * spongy parenchyma * contact probe * two-sided reflectance * leaf optical properties * leaf traits * vegetation function
OECD category: Remote sensing
Impact factor: 4, year: 2022
Method of publishing: Open access
https://www.tandfonline.com/doi/full/10.1080/22797254.2023.2292154

Leaf traits can be used to elucidate vegetation functional responses to global climate change. Pigments, water and leaf mass per area are the most used traits. However, detailed anatomical traits such as leaf thickness, the thickness of palisade and spongy parenchyma are often neglected, although they affect leaf physiological function and optical properties. Our aim was to produce partial least squares regression (PLSR) models for estimating leaf traits using biconical reflectance factor (BCRF). We established that estimation of leaf anatomical properties differs when using BCRF obtained from the upper and lower surface of the leaf. PLSR explained that 90% of the variability was based on total chlorophyll content (R2 = 0.95), spongy parenchyma to leaf thickness ratio (R2 = 0.94), equivalent water thickness (R2 = 0.93) and leaf mass per area (R2 = 0.91) or leaf thickness (R2 = 0.90). We conclude that internal asymmetry in leaf structure affects significantly leaf optical properties and should not be neglected in radiative transfer modelling at the leaf level and when upscaling leaf properties to the canopy.
Permanent Link: https://hdl.handle.net/11104/0348858