Uporaba mahov kot bioindikatorjev za ugotavljanje količine useda dušikovih in žveplovih spojin v gozdne ekosisteme : diplomsko delo - univerzitetni študij

Vrčkovnik, Maja (avtor), Batič, Franc (mentor), Simončič, Primož (komentor)

V diplomski nalogi so bile leta 2010 obravnavane vsebnosti dušika in žvepla ter izotopska sestava (Ž15N) v mahovih na območju celotne Slovenije. Mahovi vrste Hypnum cupressiforme Hedw. So bili nabrani v gozdnem prostoru na 26 izbranih lokacijah, ki so sestavni del vzorčne mreže 16 Ž 16 in 16 Ž 8 km. Vsebnosti dušika in žvepla v mahovih so bile izmerjene z elementarnim analizatorjem. Določitve Ž15N so bile opravljene z masnim spektrometrom za analitiko stabilnih izotopov lahkih elementov. Ugotovljena je bila razlika vsebnosti dušika in žvepla med mahovi, ki smo jih nabrali pod zastorom, in tistimi na prostem. Ugotovljene vsebnosti dušika in žvepla v mahovih so bile večje pod zastorom, kar je najverjetneje posledica izpiranja zračnih onesnažils krošenj. Pri analizi vsebnosti dušika, žvepla in (Ž15N) pod zastorom in na prostem glede na tip gozda so bile ugotovljene statistično značilne razlike pod zastorom, na prostem pa med iglavci in listavci ni bilo statistično značilnih razlik. Ugotovljeno je bilo, da se vsebnosti obeh elementov z oddaljenostjo od krošenj zmanjšujejo. V nalogi so bili preračunaniusedi dušika in žvepla primerjani med državami. Za dušikove usede je bilo ugotovljeno, da je Slovenija z letnim povprečjem 10,2 kg/ha pod švicarskim in nad nemškim povprečjem. Ugotovljen izračun usedov žvepla je bil povprečno 5,5 kg/ha letno, kar je precej več kot v švicarski raziskavi, kjer je bil used 2 kg/ha letno.

• Jezik: Slovenski jezik
• Ključne besede: bioindikacija, mahovi, gozdni ekosistemi, dušik, žveplo, Slovenija
• Vrsta gradiva: Diplomsko delo
• Tipologija: 2.11 - Diplomsko delo
• Organizacija: BF - Biotehniška fakulteta
• Kraj izida: Ljubljana
• Založnik: [M. Vrčkovnik]
• Leto izida: 2013
• Št. strani: VIII, 46 str.
• PID: 20.500.12556/RUL-16181
• UDK: 630*1
• COBISS.SI-ID: 3568550
• Datum objave v RUL: 11.07.2014

Sekundarni jezik

• Jezik: Neznan jezik

Izvleček

The Thesis focuses on the concentration of nitrogen and sulphur as well as thenitrogen isotope ratio (Ž15N) in mosses of the whole Slovenia in year 2010.Moss specie Hypnum cupressiforme Hedw. was sampled at a forest area on a regular 16 Ž 16 km and 8 x 16 km grid. Nitrogen and sulphur concentrations in mosses were determined with the CNS analyzer. The nitrogen isotope assessment was carried out with the stable isotope mass spectrometry for light elements. The research has shown that there are statistically significant differences between nitrogen and sulphur content in mosses sampled below the canopy and inthe gap, with higher nitrogen and sulphur content below the canopy due to canopy drip. It was further found that there are statistically significant differences in nitrogen levels in mosses collected below coniferous and deciduous trees, with higher content found below coniferous trees. For sulphurthe difference was not statistically significant, while the Ž15N value was less negative below deciduous and more negative below coniferous tree. In moss samples collected in the open area no difference neither for N, Ž15N and S according to type of the tree stand was found. The research shows, that concentration levels of N and S decreases with the distance from the plant crowns. A comparison of the nitrogen and sulphur deposition measured among countries was carried out. The average nitrogen deposition based on moss analysis for 26 locations in Slovenia was estimated to 10.2 kg/ha yearly, which is below the average deposition of Switzerland and above the average deposition of Germany. The average sulphur deposition for 26 locations was estimated to 5.5 kg/ha yearly, which is far above the Swiss average depositionof 2 kg/ha yearly.