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Odbojni spektri in fotokemična učinkovitost pri navadnem rogovilarju (Pseudevernia furfuracea Zopf.) : diplomsko delo
ID Erznožnik, Tina (Author), ID Trošt Sedej, Tadeja (Mentor) More about this mentor... This link opens in a new window

URLURL - Presentation file, Visit http://pefprints.pef.uni-lj.si/id/eprint/3067 This link opens in a new window

Abstract
Proučevali smo odbojnost lišajske steljke navadnega rogovilarja (Pseudevernia furfuracea Zopf.). Navadni rogovilar spada med grmičaste lišaje, zato je zanj značilno, da je na onesnažen zrak bolj občutljiv kot drugi gradbeni tipi lišajev. Ker nima razvite prave povrhnjice pretežno pasivno absorbirajo tako onesnažila kot hranila preko celotne zunanje površine. Meritve smo opravljali na suhih in navlaženih ter onesnaženju neizpostavljenih in izpostavljenih lišajskih steljkah. Izmerili smo odbojnost lišajske steljke v območju 280 do 800 nm ter potencialno fotokemično učinkovitost. Želeli smo raziskati spremembe odbojnih spektrov in morebitno povezanost s fotokemično učinkovitostjo, ki je pokazatelj vitalnosti lišajske steljke. Zanimalo nas je tudi ali se odbojni spektri lišajskih steljk razlikujejo pri lišajih, ki so izpostavljeni različnim okoljskih razmerah. Rezultati so pokazali, da so odbojni spektri lišajskih steljk nižji v UV spektru in višji v IR območju, kar je posledica biokemijskih, anatomskih in morfoloških značilnosti. Razlike v odbojnosti so bile razvidne v vidnem delu spektra, kar lahko pripišemo variabilnosti fotosinteznih barvil in glivne komponente v lišaju, ki je odgovorna za obarvanje in sekundarne metabolne procese. Meritve fotokemične učinkovitosti so pokazale, da imajo metabolno aktivne lišajske steljke, ki so bile izpostavljene onesnaženemu zraku, manjšo fotokemično učinkovitosti.

Language:Slovenian
Keywords:grmičasti lišaji
Work type:Bachelor thesis/paper
Typology:2.11 - Undergraduate Thesis
Organization:PEF - Faculty of Education
Publisher:[T. Erznožnik]
Year:2015
Number of pages:VII f., 41 str., [2] str. pril.
PID:20.500.12556/RUL-72685 This link opens in a new window
UDC:58(043.2)
COBISS.SI-ID:10713417 This link opens in a new window
Publication date in RUL:29.09.2015
Views:1441
Downloads:188
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Secondary language

Language:English
Title:Reflectance spectra and photochemical efficency of a tree moss (Pseudevernia furfuracea Zopf.)
Abstract:
We studied the reflectance spectra of lichen Pseudevernia furfuracea Zopf. Pseudevernia furfuracea Zopf. belongs to the family of bush lichens, which characteristically can be more affected by polluted air, when compared to other types of lichens. Because it does not have a real epidermis, it passively absorbs pollutants as well as nutrients through its entire outer surface. We measured dry and moistened lichen, from which some were exposed to pollution and some were not. We measured the reflectance spectra of lichen in the range of 280 to 800 nm, and the potential photochemical efficiency. We wanted to explore changes in the reflectance spectra and the possible connection to the photochemical efficiency, which is an indicator for the vitality of the lichen. We were also interested in, whether the reflectance spectra of lichen vary from lichens that thrive in different environmental conditions. The results show that lichens have a lower reflectance by the UV and a higher reflectance in the NIR range, which is probably a consequence of anatomical and morphological characteristics. Differences in reflectance were observed in the visible region of the spectrum, which can be attributed to the variability of the pigments and fungal components in the lichen, which is responsible for the pigment coloration and secondary metabolic processes. Photochemical efficiency measurements have shown that the moistened lichen, which were exposed to air pollution, have a lower photochemical efficiency.

Keywords:Pseudevernia furfuracea Zopf

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