Wyniki wyszukiwania - Biblioteka Nauki

1

Response of Norway spruce root system to elevated atmospheric CO2 concentration

100%

Pokorny R. , Tomaskova I. , Marek M. V.

Acta Physiologiae Plantarum

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2013

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tom 35

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nr 06

EN

Root structure parameters, root biomass and allometric relationships between above- and belowground biomass were investigated in young Norway spruce (Picea abies [L.] Karst.) trees cultivated inside the glass domes with ambient (AC, 375 lmol(CO2) mol-1) and elevated (EC, A + 375 lmol(CO2) mol-1) atmospheric CO2 concentrations ([CO2]). After 8 years of fumigation, a mean EC tree in comparison with AC one exhibited about 37 % higher belowground biomass. The growth of primary root structure was unaffected by elevated [CO2]; however, the biomass of secondary roots growing on the primary root structure and the biomass of secondary roots growing in the zone between the soil surface and the first primary root ramification were significantly higher in EC comparing with AC treatment about 58 and 70 %, respectively. The finest root’s (diameter up to 1 mm) biomass as well as length and surface area of both primary and secondary root structures showed the highest difference between the treatments; advancing EC to AC by 43 % on average. Therefore, Norway spruce trees cultivated under wellwatered and rather nitrogen-poor soil conditions responded to the air elevated [CO2] environment by the enhancement of the secondary root structure increment, by enlargement of root length and root absorbing area, and also by alternation of root to aboveground organ biomass proportion. Higher root to leaf and root to stem basal area ratios could be beneficial for Norway spruce trees to survive periods with limited soil water availability.

2

The effects of elevated atmospheric [CO2] on Norway spruce needle parameters

100%

Pokorny R. , Tomaskova I. , Marek M. V.

Acta Physiologiae Plantarum

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2011

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tom 33

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nr 6

EN

Studies of selected morphological needle parameters were carried out on young (17–19 year old) Norway spruce trees cultivated inside glass domes at ambient (A, 370 µmol (CO₂) mol⁻¹) and elevated (E, 700 µmol (CO₂) mol⁻¹) atmospheric CO₂ concentrations [CO₂] beginning in 1997. Annual analyses performed from 2002 to 2004 revealed higher values for needle length (especially for current needles, up to 18%) and projected needle area (up to 13%) accompanied by lower values for specific needle area (up to 15% lower, as quantified by needle mass to projected area ratio) in the E treatment compared to the A treatment. Statistically significant differences for most of the investigated morphological parameters were found in young needles in the well irradiated sun-adapted crown parts, particularly under waterlimiting soil conditions in 2003. This was likely a result of different water relations in E compared to A trees as investigated under temperate water stress (Kuper et al. in Biol Plantarum 50:603–609, 2006). Furthermore, E trees had much higher absorbing root area, which modified and enhanced root:shoot as well as root:conductive stem area proportions. These hydraulic properties and early seasonal stimulation of photosynthesis forced advanced needle development in E trees, particularly under limited soil water conditions. The number of needles per unit shoot length was found to be unaffected by elevated [CO₂].

3

Effect of SiO2 nanoparticles on drought resistance in hawthorn seedlings

88%

Ashkavand P. , Tabari M. , Zarafshar M. , Tomaskova I. , Struve D.

Leśne Prace Badawcze

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2015

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tom 76

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nr 4

4

Testing of hybrid progenies and various species of genus abies for forestry, decorating horticulture and christmas tree production

75%

Kobliha J. , Stejskal J. , Lstiburek M. , Typta J. , Tomaskova I. , Jakubuv P.

Acta Scientiarum Polonorum. Hortorum Cultus

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2013

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tom 12

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nr 4

EN

The paper evaluated dendrometric parameters of hybrid progenies of various Abies species obtained during measurements in the spring 2010 on the research plot in Kostelec nad ýernými lesy. Data were processed and compared to the measurement taken in 2004. Results show that all hybrid progenies within the plot exceeded A. alba in investigated parameters. Only two of the progenies achieved worse results in mean height – A. koreana × (A. cilicica × A. cephalonica) and progeny of spontaneous hybrid no. 2. Considering height and diameter A. nordmanniana was evaluated as the most productive. On the contrary A. gracilis is considered unsuitable for further culture and research due to the mortality of 100%.

PL

Niniejsza praca ocenia parametry dendrometryczne hybrydowego potomstwa różnych gatunków Abies otrzymane podczas pomiarów wiosną 2010 na poletku doświadczalnym w Kostelec nad Černými lesy. Otrzymane dane były przetworzone i porównane z pomiarami poczynionymi w roku 2004. Wyniki pokazują, że całe potomstwo hybrydowe na poletku przewyższało A. alba pod względem badanych parametrów. Tylko dwa osiągnęły gorsze rezultaty, jeśli chodzi o średnią wysokość – A. koreana × (A. cilicica × A. cephalonica) oraz potomek spontanicznej krzyżówki no. 2. Pod względem wysokości i średnicy, A. nordmanniana oceniono jako najbardziej produktywną. Z kolei A. gracilis uważa się za nieodpowiednią do dalszej uprawy i badań ze względu na 100% śmiertelność