Vliv hustoty porostu, prořezávky a zvýšené koncentrace CO2 na hustotu dřeva kmene smrku

0090414 - ÚVGZ 2008 CZ eng A - Abstract
Tomášková, Ivana - Pokorný, Radek - Marek, Michal V.
Vliv hustoty porostu, prořezávky a zvýšené koncentrace CO2 na hustotu dřeva kmene smrku.
[Influence of stand density, thinning and elevated CO2 on stem wood density of spruce.]
Journal of Forest Science. Czech Academy of Agricultural Sciences. Roč. 9, č. 53 (2007), s. 400-405. ISSN 1212-4834
R&D Projects: GA MŠMT 2B06068; GA MŽP SM/640/18/03; GA MŽP SM/630/2/03
Institutional research plan: CEZ:AV0Z60870520
Keywords : elevated CO2 * Picea abies * stand density * stem wood density
Subject RIV: GK - Forestry

Stem wood density (SWD) of young Norway spruce trees (Picea abies [L.] Karst.) growing at ambient (A variant, 350 mol(CO2)mol-1) and elevated (E variant, A+350 mol(CO2)mol-1) atmospheric CO2 concentration inside of the glass domes with adjustable windows was estimated after six and eight years of the cultivation. Stand density of two subvariants (s - sparse with ca 5.000 trees/ha and d - dense with ca 10.000 trees/ha) and thinning impact (intensity of 27%) on SWD and its variation along the stem vertical profile were investigated. After six years of CO2 fumigation, stems of sparse subvariant had about 10% lower values of SWD comparing to dense ones. Two years after thinning, the SWD values were higher in all subvariants along the whole stem vertical profile. This increase was more obvious in E variant (about 6% in d subvariant and 3% in s subvariant). The highest increase of SWD values (about 8%) was found in Ed subvariant, particularly in the middle stem part.

Stem wood density (SWD) of young Norway spruce trees (Picea abies [L.] Karst.) growing at ambient (A variant, 350 mol(CO2)mol-1) and elevated (E variant, A+350 mol(CO2)mol-1) atmospheric CO2 concentration inside of the glass domes with adjustable windows was estimated after six and eight years of the cultivation. Stand density of two subvariants (s - sparse with ca 5.000 trees/ha and d - dense with ca 10.000 trees/ha) and thinning impact (intensity of 27%) on SWD and its variation along the stem vertical profile were investigated. After six years of CO2 fumigation, stems of sparse subvariant had about 10% lower values of SWD comparing to dense ones. Two years after thinning, the SWD values were higher in all subvariants along the whole stem vertical profile. This increase was more obvious in E variant (about 6% in d subvariant and 3% in s subvariant). The highest increase of SWD values (about 8%) was found in Ed subvariant, particularly in the middle stem part.

Hustota dřeva kmene (SWD) byla stanovena u mladých jedinců smrku ztepilého (Picea abies [L.]) kultivovaných po dobu šesti a osmi let v přirozené (varianta A, 350 mol(CO2)mol-1) a zvýšené (varianta E, A+ 350 mol(CO2)mol-1) vzdušné koncentraci CO2 uvnitř lamelových komor. Zkoumán byl vliv rozdílných hustot porostu (sub-varianty: s- řídká 5tis. ks.ha-1 a d- hustá 10tis. ks.ha-1) a prořezávky (intenzita 27%) na SWD a jeho změny v podélném profilu kmene. Po šesti letech fumigace CO2 byly hodnoty SWD kmenů řídké sub-varianty v průměru o 10% nižší ve srovnání s hustou sub-variantou. Dva roky po prořezávce byla SWD kmenů výší podél celého profilu kmene ve všech sub-variantách. Tento nárůst byl výrazný především ve variantě E (v průměru o 6% v husté sub-variantě a o 3% v řídké). K nejvyššímu nárůstu hodnot SWD kmenů husté sub-varianty E (o 8%) došlo ve střední části kmene.
Permanent Link: http://hdl.handle.net/11104/0151308