Vpliv struktur na površini lista na odbojnost sevanja pri izbranih rastlinskih vrstah : diplomsko delo

Uranič, Maja (author), Gaberščik, Alenka (mentor)

V diplomski nalogi smo proučevali optične lastnosti listov izbranih rastlinskih vrst. Zanimalo nas je, kako strukture na površini listov, to sta kutikula in trihomi, vplivajo na odbojnost. Izbrali smo 10 rastlinskih vrst. Polovica jih je bila brez trihomov, polovica s trihomi. Pri rastlinskih vrstah smo izmerili odbojnost lista s kutikulo in brez nje oziroma s in brez trihomov. Pri listih, kjer smo merili odbojnost s in brez kutikule smo meritve opravili na starih in mladih listih za posamezno vrsto. Odbojnost listov smo merili v območju med 280 in 880 nm. Rezultate smo med seboj primerjali in ugotovili, da imajo izbrani vzorci rastlinskih vrst nekaj skupnih spektralnih lastnosti. Izmerili smo nizko odbojnost v vidnem delu spektra (380–700 nm) z vrhom v zelenem območju vidnega spektra (550 nm) in visoko odbojnost v NIR območju (700–880 nm). Ugotovili smo, da so rezultati meritev zelo variabilni. Vpliv odstranjene kutikule je bil pri izbranih vrstah večji kot vpliv odstranjenih trihomov Kutikula je vplivala predvsem v UV in NIR delu spektra. Trihomi pa so imeli značilen vpliv pri lasastem dimku v vidnem spektru in NIR. Starost listov ni vplivala na odbojnost, saj je bila izmerjena odbojnost pri obeh starostnih razredih podobna.

• Language: Slovenian
• Keywords: prepustnost, kutikula, trihomi
• Work type: Undergraduate thesis
• Typology: 2.11 - Undergraduate Thesis
• Organization: PEF - Faculty of Education
• Publisher: [M. Uranič]
• Year: 2015
• Number of pages: VIII, 44 f., [18] f. pril.
• PID: 20.500.12556/RUL-70818
• UDC: 58(043.2)
• COBISS.SI-ID: 10582601
• Publication date in RUL: 10.07.2015

URANIČ, Maja, 2015, Vpliv struktur na površini lista na odbojnost sevanja pri izbranih rastlinskih vrstah : diplomsko delo [online]. Bachelor’s thesis. M. Uranič. [Accessed 14 April 2025]. Retrieved from: http://pefprints.pef.uni-lj.si/id/eprint/2845

Secondary language

• Language: English
• Title: The influence of leaf surface structures on light reflectance in selected plant species

Abstract

In this graduation thesis we studied optical properties of leaves of the selected species of plants. We were interested in how structures on the leaves surface (cuticle and trichomes) affect light reflectance. Ten plant species were chosen. For this reason we removed either cuticle or trichomes. We measured reflectance with and without cuticle in the first group of plants, and with and without trichomes in the second. Leaf reflectance was measured in the range from 280 nm to 880 nm. Comparison of the results showed that chosen plant samples have some spectral properties in common, mostly low reflectance in visible spectrum (380-700 nm) with peak in green range of visible spectrum (550 nm), and high reflectance in NIR area (700-880 nm). We found out that samples were very variable, therefore the importance of structures on the leaf surface structures was not confirmed in all cases. The influence at chosen plant species with removed cuticle was higher then influence of removed trichomes. Cuticle influenced light reflectance in particular in UV and NIR spectra. Trichomes significantly influenced the light reflection in visible and NIR spectrum at Crepis capillaris. The age of leaves did not affect the reflectance, as the measured reflectance was very similar in two age classes.