BF, Forestry Library, Ljubljana (GIS)
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Nastajanje lesa pri pravem kostanju (Castanea sativa Mill.) z rastišča v Italiji : diplomsko delo - univerzitetni študij = Wood formation in chestnut (Castanea sativa Mill.) at the site in Italy : graduation thesis - university studiesVovk, Matej, gozdarZ metodo odvzema mikro izvrtkov so med 16. marcem in 28. oktobrom 2009 s prsne višine (1,3 m) desetih dreves pravega kostanja (Castanea sativa Mill.) z rastišča Monti Cimini v pokrajini Lazio v ... Italiji tedensko odvzemali vzorce. Pripravili so mikroskopske preparate, ki so vsebovali les, kambij in floem in jih proučili s svetlobnim mikroskopom Nikon Eclipse 800 (svetlo polje in polarizirana svetloba), digitalno kamero DS-Fi1 in sistemom za analizo slike NIS Elements BR3. Za vsak teden so določili širino ksilemskega prirastka tekoče branike in ovrednotili razvojno stopnjo celic v lesu. Med 31. marcem in 7. aprilom 2009 so zasledili nastanek prvih trahej. Sinteza sekundarne celične stene in lignifikacija se je pri prvih trahejah začela v tednu med 23. in 29. aprilom. Biosinteza sekundarne celične stene in lignina se je najprej začela okoli prvih trahej, pozneje pa še v preostalem tkivu. Med 20. in 29. majem se je zaključilo nastajanje ranega lesa. Rani les je vseboval 2-3 vence trahej, njegov delež pa je bil večji v ožjih branikah. Najbolj intenzivno nastajanje celic ksilemske branike so zabeležili v času od začetka junija do začetka julija. Kasni les je začel nastajati med 20. in 29. majem, dokončno pa se je oblikoval med 24. septembrom in 1. oktobrom. Branika je nastajala približno 4 mesece, pri čemer so opazili razlike med drevesi. Končna širina branike 2009 je povprečju znašala 3648 m (3516 703 m). Rezultate o rasti branike so izravnali z Gompertzovo, Chapman-Richardovo, Weibullovo in Korfovo rastno funkcijo. Pri primerjavi teh rastnih funkcij so ugotovili, da se vse dobro prilegajo meritvam širin nastajajoče ksilemske branike. Gompertzova funkcija se zdi najprimernejša, ker se pri njej točka prevoja najbolje ujema z dejansko kulminacijo tekočega prirastka. Parametri te funkcije so tudi sicer primerni za opis dinamike nastajanja lesa.Type of material - undergraduate thesis ; adult, seriousPublication and manufacture - Ljubljana : [M. Vovk], 2010Language - slovenianCOBISS.SI-ID - 3082662
Author
Vovk, Matej, gozdar
Other authors
Čufar, Katarina
Topics
pravi kostanj |
Castanea sativa |
Italija |
ksilogeneza |
nastanek lesa |
kambijeva aktivnost |
diferenciacija
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Vovk, Matej, gozdar | 36175 |
Čufar, Katarina | 02937 |
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