Variabilnost dinamike nastajanja lesa pri smrekah s Pokljuke v letih 2005, 2006, 2007 : diplomsko delo - visokošolski strokovni študij

Pacek, Boštjan (author), Oven, Primož (mentor), Levanič, Tom (reviewer)

Z metodo "pining" smo na Pokljuki v letih 2005, 2006 in 2007 raziskovali nastajanje ksilema in s tem variabilnost dinamike nastajanja lesa pri petih različnih smrekah. Enkrat tedensko smo jih poškodovali z iglo. Začeli smo v letu 2005 (od 11. 5. do 5. 10.), nadaljevali v letu 2006 (od 12. 5. do 11. 10.) in nato še v letu 2007 (od 26. 4. do 12. 9.), nato pa so drevesa posekali. V tem času je nastalo 197 anatomskih preparatov, ki smo jih pripravili za mikroskopijo. Ranitev z iglo je povzročila nekrozo kambija, nastanek kalusa in ranitvenega lesa. Zaradi ranitve z metodo "pining" smo lahko določili začetek delitvene aktivnosti kambija. Ta je bil v različnih letih in pri posameznih drevesih precej različen. Najprej se je delitev začela v letu 2007 pri smrekah 1 in 2 že v času od 3. 5. - 11. 5., pri smrekah 3, 5 in 6 pa od 11. 5. - 18. 5., nato v letu 2005 pri smrekah 1, 2 in 6 v času od 25. 5. - 1. 6. 2005 ter pri smrekah 3 in 5 teden kasneje, od 1. 6. - 8. 6. 2005, in na koncu v letu 2006 pri smrekah 1, 2 in 6 v času od 23. 5. - 1. 6. 2006, medtem ko pri smrekah 3 in 5 šele od 14. 6 - 21. 6. 2006. Tudi zaključek rastne sezone je bil pri posameznih drevesih različen; najprej se je kambijeva delitvena aktivnost zaključila v letu 2007 pri smrekah 3, 5 in 6 v tednu od 2. 8. - 8. 8. 2007, pri smreki 1 od 8. 8. - 16. 8. 2007 in smreki 2 od 16. 8. - 22. 8. 2007, nato v letu 2006 pri smreki 3 v tednu od 2. 8. - 8. 8. 2006, sledile so smreke 1, 5 in 6 od 16. 8. - 24. 8. 2006 ter pri smreki 2 od 30. 8. - 6. 9. 2006, najdlje pa je trajala v letu 2005, ko se je najprej zaključila pri smreki 3 v tednu od 17. 8. - 24. 8. 2005, sledile so smreke 1, 2 in 5, kjer se je delitvena aktivnost zaključila od 24. 8. - 31. 8. 2005, nazadnje pa še pri smreki 6, od 31. 8. - 7. 9. 2005. Na začetek in konec delitvene aktivnosti kambijeve cone lahko vpliva zdravstveno stanje posameznega drevesa, prav tako pa so pomembni tudi zunanji dejavniki, kot so temperatura in padavine.

• Language: Slovenian
• Keywords: kambijeva aktivnost, nastanek lesa, pining, Pokljuka, smreka, Picea abies (L.) Karst
• Work type: Undergraduate thesis
• Typology: 2.11 - Undergraduate Thesis
• Organization: BF - Biotechnical Faculty
• Place of publishing: Ljubljana
• Publisher: B. Pacek
• Year: 2016
• Number of pages: VIII, 34 f., [4] f. pril.
• PID: 20.500.12556/RUL-158876
• UDC: 630*811
• COBISS.SI-ID: 2648457
• Publication date in RUL: 21.06.2024

Secondary language

• Language: English
• Title: Variability of wood formation dynamics in spruce from Pokljuka in years 2005, 2006, 2007 : graduation thesis - higher professional studies

Abstract

The study of the formation of xylem and the variability of wood formation dynamics in five different spruces on Pokljuka in 2005, 2006 and 2007 was conducted by using the "pinning" method. All the trees were pinned once a week with a needle. The pinning started in 2005 (from 11. 5. to 5. 10.), continued in 2006 (from 12. 5. to 11. 10.), and finished in 2007 (from 26. 4. to 12. 9.), after which the trees were cut down. 197 anatomical specimens were extracted and prepared for microscopy. Pinning caused necrosis of cambial cells, the formation of callus and typical wound wood. The method enabled us to determine the start of cambium division activity, which differed significantly in all three years and for individual trees. The cambium activity started first in 2007, in spruces 1 and 2 as early as 3. 5. - 11. 5., and in spruces 3, 5 and 6 between 11. 5. - 18. 5. In 2005, the cambium activity took place in the period from 25. 5. - 1. 6. 2005 in spruces 1, 2, and 6, while in spruces 3 and 5, it happened a week later, from 1. 6. - 8. 6. 2005. Finally, in 2006, it started in spruces 1, 2 and 6 in the period from 23. 5. - 1. 6. 2006, and only between 14. 6. - 21. 6. 2006 in spruces 3 and 5. The end of growing season differed for individual trees as well. Cambium division activity finished first in 2007 in spruces 3, 5 and 6 in the week between 2. 8. - 8. 8. 2007, in spruce 1 between 8. 8. - 16. 8. 2007 and in spruce 2 between 16. 8. - 22. 8. 2007. In 2006, it finished between 2. 8. - 8. 8. 2006 in spruce 3, followed by spruces 1, 5 and 6 between 16. 8. - 24. 8. 2006, and between 30. 8. - 6. 9. 2006 in spruce 2. The longest cambium activity took place in 2005, with the first finish during the week of 17. 8. - 24. 8. 2005 in spruce 3, followed by spruces 1, 2 and 5 between 24. 8. - 31. 8. 2005 and finally by spruce 6 between 31. 8. - 7. 9. 2005. The beginning and the end of the division activities in the cambial zone are affected by the health status of individual trees, as well as by external factors, e.g. temperature and precipitation.

• Keywords: cambial activity, wood formation, pinning, Pokljuka, Norway spruce, Picea abies (L.) Karst