diplomsko delo
Neva Jelenko (Author), Alenka Gaberščik (Mentor), Alenka Gaberščik (Thesis defence commission member), Tadeja Trošt Sedej (Thesis defence commission member), Mateja Germ (Thesis defence commission member)

Abstract

V okviru diplomskega dela smo raziskovali optične lastnosti listov navadnega trsta (Phragmites australis), vpliv anatomskih in biokemijskih lastnosti na odbojne in presevne spektre ter razlike v lastnostih med različno starimi listi. Ugotavljali smo tudi vsebnost fitolitov v listih in njihov vpliv na odbojnost in presevnost. Rastline smo nabrali v sestojih trsta na Cerkniškem jezeru. Merili smo vsebnost klorofila a in b, karotenoidov, antocianov in UV absorbirajočih snovi, lastnosti zgradbe lista ter njihove optične lastnosti v območju od 280-880 nm. Listi so se med seboj najbolj razlikovali v debelini kutikule in mezofila ter številu listnih rež. Po biokemijskih parametrih najbolj odstopajo stari julijski listi. V vsebnosti fitolitov med starimi in mladimi listi v ni razlik. Razlike so se pokazale med junijskimi in julijskimi listi. Krivulje odbojnih in presevnih spektrov so si po obliki med seboj podobne ne glede na starost listov. Odbojni in presevni spektri imajo relativno nizko odbojnost in prepustnost v UV in vidnem delu spektra ter relativno visoko odbojnost in prepustnost v NIR območju. Z RDA analizo smo ugotovili, da so na odbojnost najbolj vplivali: vsebnost karotenoidov, klorofila a, dolžina bodičk, dolžina rež ter debelina mezofila, na presevnost pa število rež na zgornji povrhnjici in debelina zgornje povrhnjice. Bistvena razlika med junijskimi in julijskimi listi se je pokazala v NIR območju spektra, kjer so imeli junijski listi bistveno nižjo odbojnost.

Keywords

optične lastnosti;fitoliti;silicij;odbojnost;presevnost;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL BF - Biotechnical Faculty
Publisher: [N. Jelenko]
UDC: 58(043.2)
COBISS: 11321161 Link will open in a new window
Views: 492
Downloads: 103
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Other data

Secondary language: English
Secondary title: Optical properties and phytolit content in common reed
Secondary abstract: We studied the optical properties of common reed leaves (Phragmites australis), the influence of anatomical and biochemical characteristics on light reflectance and transmittance and the differences in characteristics between the leaves of different age. We also determined the content of phytoliths in leaves and their influence on reflectance and transmittance. Plants were collected in reed stands at Lake Cerknica. We have measured the concentration of chlorophyll a and b, carotenoids, anthocyanins and UV-absorbing compounds, the structural properties of the leaves, and their optical properties in the range of 280 to 880 nm. The leaves differed the most in the thickness of the cuticle and mesophyll and the number of stomata. Biochemical parameters differ the most in old leaves, sampled in July. The content of phytoliths in old and young leaves was very similar. The leaves differed the most in June and July. Curves of reflectance and transmittance spectra have similar shape irrespective of the age of the leaves. We measured relatively low reflectance and transmittance in the ultraviolet and visible part of the spectrum and a relatively high reflectance and transmittance in the NIR range. The RDA analysis revealed that the reflectance spectra are the most affected by the content of carotenoids, chlorophyll a, the length of prickle hairs, the length of the stomata and the thickness of the mesophyll, while the transmittance spectra are affected by the number of stomata in the upper epidermis and the thickness of the upper epidermis. The most pronounced difference between the June and July leaves is evident in the NIR region, as leaves sampled in June had significantly lower reflectance.
Secondary keywords: botany;botanika;
File type: application/pdf
Type (COBISS): Undergraduate thesis
Thesis comment: Univ. v Ljubljani, Pedagoška fak., Biotehniška fak., Fak. za kemijo in kemijsko tehnologijo, Naravoslovnotehniška fak., Kemija in biologija
Pages: XI, 39 f.
ID: 9225979