Vpliv prahu na spektralne in funkcionalne lastnosti listov navadne bukve (Fagus sylvatica L.) : doktorska disertacija

Zajec, Luka (author), Gaberščik, Alenka (mentor)

Raziskovali smo vpliv prahu na spektralne in funkcionalne lastnosti listov navadne bukve (Fagus sylvatica L.). Vpliv prašnih delcev smo ugotavljali na treh lokacijah ob kamnolomu in ga primerjali z referenčno lokacijo v dveh rastnih sezonah. V tretji sezoni smo izvedli poskus v delno nadzorovanih razmerah z dodajanjem prahu v dveh različnih koncentracijah. Opravili smo meritve izbranih anatomskih, biokemijskih in fizioloških lastnosti listov. Izmerili smo odbojne in presevne spektre listov s prahom in tistih, ki smo jim prah odstranili v območju 280%880 nm. Ugotavljali smo povezanost med prisotnostjo prahu, lastnostmi listov in optičnimi lastnostmi. Rezultati iz narave, kjer so bile koncentracije prahu nizke (največ 0,25 + 0,11 mg/cm2), so pokazali razlike v anatomskih, biokemijskih in fizioloških lastnostih listov bukve na različnih rastiščih, kar ni bilo povezano le s prisotnostjo prahu, ampak je bilo tudi posledica okoljskih razmer na rastišču. Rezultati kratkotrajnega poskusa so pokazali, da le prisotnost apnenčastega prahu na listih bukve v visokih koncentracijah (8,98 + 4,05 mg/cm2) močno spremeni odbojnost listov navadne bukve v vidnem in UV-spektru, medtem ko nižje koncentracije prahu na listih nimajo velikega vpliva. Prepustnost sončne svetlobe skozi list je spremenjena v vidnem in v NIR-območju. To se je odrazilo v povečani koncentraciji fotosinteznih barvil in zmanjšanju vsebnosti snovi z zaščitno vlogo: antocianov in UV-absorbirajočih snovi. Redundantna analiza je pokazala, da je koncentracija prahu v naravnih razmerah pojasnila le 16 % (p < 0,001) variabilnosti odbojnih spektrov. V kratkotrajnem poskusu z visokimi koncentracijami prahu je prisotnost prahu razložila 67 % (p < 0,001) variabilnosti odbojnih spektrov ter 12 % (p < 0,001) variabilnosti presevnih spektrov.

• Language: Slovenian
• Keywords: spektralne lastnosti, funkcionalne lastnosti, prah, listi, bukev, Fagus sylvatica L., disertacije
• Work type: Dissertation
• Typology: 2.08 - Doctoral Dissertation
• Organization: BF - Biotechnical Faculty
• Place of publishing: Ljubljana
• Publisher: [L. Zajec]
• Year: 2016
• Number of pages: XV f.,123, [5] str.
• PID: 20.500.12556/RUL-115368
• UDC: 502/504+543.275:630*16(043.3)=163.6
• URN: URN:NBN:SI:doc-Q8DZFISY
• COBISS.SI-ID: 883831
• Publication date in RUL: 24.04.2020

Secondary language

• Language: English
• Title: The influence of dust on spectral and functional properties of european beech leaves (Fagus sylvatica L.)

Abstract

We studied the influence of limestone dust on spectral and functional properties of European beech leaves (Fagus sylvatica L.) at three different locations along a limestone quarry and compared them to a reference location in two growing seasons. In the third season measurements were conducted in an independent experiment under partially controlled conditions by the controlled feeding of limestone dust in two different concentrations of the dust. Measurements of anatomical and biochemical properties of the leaves were performed. The reflectance spectra of the leaves with the dust and of those where the dust was removed were measured in the range of 280%880 nm. The effect of the dust on the measured parameters was studied and correlations among the presence of dust, leaves' and spectral reflectance properties were analysed. The results from nature where the dust concentrations were low (max 0,25 + 0,11 mg/cm2) showed differences in anatomical, biochemical and physiological characteristcs of beech leaves from different test sites. This was not only a consequence of the presence of the dust but also of the environmental conditions on the test sites. The results of the short experiment showed that only high concentrations (8,98 + 4,05 mg/cm2) of limestone dust on beech leaves significantly changed the reflectance properties of the leaves of common beech in the visible and UV spectra, while low concentrations had no major effect on the leaves. The transmittance of the sunlight through the leaves was changed in the visible and near infrared spectra, which was reflected in the increased concentration of photosynthetic pigments and reduced substances for photoprotective function: anthocyanins and UV absorbing substances. The redundancy analysis revealed that the dust concentration in natural conditions explained only 16 % (p < 0,001) of the variability of the reflection spectra. In the short experiment with high dust concentrations the presence of the dust explained 67 % (p < 0,001) of the variability of the reflection spectra and 12 % (p < 0,001) of the variability of the

• Keywords: spectral properties, functional properties, dust, leaves, beech, Fagus sylvatica L.