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Wyszukujesz frazę "European larch" wg kryterium: Temat


Wyświetlanie 1-7 z 7
Tytuł:
Genetic status of Polish larch (Larix decidua subsp. polonica (Racib. Domin)) from Chełmowa Mountain: implications for gene conservation
Autorzy:
Litkowiec, M.
Lewandowski, A.
Burczyk, J.
Powiązania:
https://bibliotekanauki.pl/articles/2078281.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
European larch
genetic diversity
microsatellites
spatial genetic structure
Opis:
The Polish larch (Larix decidua subsp. polonica (Racib. Domin), a subspecies of European larch, is one of the most valuable forest-forming trees in Poland. It was first discovered on the Chełmowa Mountain where Natural Reserve has been established to protect this subspecies. Currently, this unique population is at risk of extinction. Nonetheless, the knowledge on the genetic diversity of this population and surround- ing larch forests is insufficient to undertake actions aimed at conservation of genetic resources. In this study, we examined the level of genetic diversity and differentiation of four subpopulations of Polish larch from Nature Reserve on the Chełmowa Mountain and surrounding areas. We used eleven nuclear microsatellite markers (SSRs) combined in two multiplex PCR reactions. In total, 344 individuals of Polish larch were genotyped and subjected to further population genetic analyses. We found the high level of genetic diversity (average: He = 0.752, Ho = 0.720) and low levels of genetic differentiation (average: Fst = 0.022). The effective population size was large and homogeneous across subpopulations (mean Ne=90.7), and we found no sign of inbreeding. The spatial genetic structure was detected in two older subpopulations but not in the younger one, suggesting its artificial origin. The old larch subpopulations were genetically homogeneous and they were related to the ancestral group of Polish lowland populations. The old larch core populations growing on Chełmowa Mountain are relatively homogeneous and they well represent the ancestral genetic group of Polish lowland larch populations. However, they still exhibit rela- tively high genetic diversity and sufficiently large effective population sizes assuring their adaptive potential for a long-term existence. Surrounding larch populations are even more genetically diverse but this might be the effect of an admixture of seed sources from various populations from a wider area of Central Europe. We recommend that specific conservation efforts should be undertaken to promote natural regeneration of the core larch populations, even supplemented by the planting of seedlings derived from the oldest larch trees. Other management actions should focus on limiting external gene flow to this unique population of Polish larch.
Źródło:
Dendrobiology; 2018, 80; 101-111
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variation of bud flushing in Larix decidua clones
Autorzy:
Sierota, Zbigniew
Ukalska, Joanna
Zagożdżon, Marcin
Damszel, Marta
Zawadzka, Anna
Bystrowski, Cezary
Powiązania:
https://bibliotekanauki.pl/articles/956999.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
european larch
seed orchard
bud burst
temperature
generalized linear model
Opis:
In situ assessments of bud flushing in European larch Larix decidua Mill. clones growing under natural conditions were conducted in the Łęgajny seed orchard, Warmia-Masuria Province, Poland. The 27 assessed clones (among a total of 332 trees) were derived from superior plus trees from six selected stands in north eastern Poland. The analyses were carried out on 15-year-old clones grown in two seed orchard sectors differing in soil moisture conditions (no. 3, a nearly flat surface with southern exposure and no. 5, a flat surface, slightly inclined toward the north and periodically flooded by nearby bog-springs). Apical and axillary bud flushing was assessed in March/April 2014, using a 6-stage scale. Significant differences in bud burst were observed among clones, bud types (apical or axillary), clone provenances and growing conditions in seed orchard sectors. Generally, axillary buds flushed earlier than apical buds. Clones growing in section no. 3 showed earlier bud flushing than in section no. 5. Daily mean temperature during the initial bud burst period (stages 0–3) had no significant effect on bud flushing in a number of clones, however the cumulative temperature in that period was strong correlated with bud flushing for particular clones and provenances which suggests susceptibility to spring frost. Local site conditions (i.e. different soil moisture contents and insolation levels between sectors) as well as decreased temperatures in the first period of bud development had strong effects on bud flushing in European larch clones.
Źródło:
Dendrobiology; 2017, 77; 91-103
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlations between the Germination Capacity and Selected Attributes of European Larch Seeds (Larix Decidua Mill.)
Autorzy:
Kaliniewicz, Z.
Markowski, P.
Anders, A.
Rawa, T.
Liszewski, A.
Fura, S.
Powiązania:
https://bibliotekanauki.pl/articles/298087.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
modrzew europejski
nasiona
kiełkowanie
właściwości rozdzielcze
European larch
seeds
separation properties
germination
Opis:
The critical transport velocity, basic dimensions (thickness, width and length), the angle of sliding friction and weight of European larch seeds from three batches were determined. The values of shape factors, cross-sectional area, volume and density were calculated for all seeds. The seeds were germinated, and germination time was determined. The investigated attributes were compared by single classification analysis of variance and correlation analysis. The germination capacity of seeds from the same stand varied between harvest years, and germination time was most highly correlated with critical transport velocity and density. The lightest seeds should be separated from the batch to improve germination capacity, and seeds of the heaviest fractions should be used to promote even germination.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2012, 15(2); 229-242
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the influence of larch fibers and particles on selected properties of fiber- and particleboards
Autorzy:
Pazio, Bartłomiej
Boruszewski, Piotr.
Powiązania:
https://bibliotekanauki.pl/articles/2200141.pdf
Data publikacji:
2020
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
European larch
plantations
plantation cultivation
particle-fibrous boards
properties of wood-based boards
Opis:
Analysis of the influence of larch fibers and particles on selected properties of fiber- and particleboards. The paper presents the results of the research on the effect of the addition of fibers and particles obtained from European larch wood (Larix decidua Mill) from plantations on selected properties of fiber- and particleboards in comparison to the boards of the same structure based on typical industrial raw material (pine wood) uses by European wood based panels industry. The differences were shown in the tests, i.e.: modulus of rupture (MOR), modulus of elasticity in static bending (MOE), internal bond (IB), thickness swelling after 2 and 24 hours soaking in water and density profile. In the MOR and MOE tests, larch boards with a minimum 50% fiber share were characterized by comparable values of the properties determined to pine boards, while in the other variants, boards made of pine wood had better properties. In most cases, the larch boards were characterized by significantly lower values of swelling by thickness (with the exception of boards made of fibers) than boards made of wood from forest cultivation. The density profile of the boards on the cross-section of the plantation raw material did not differ from the boards made of pine raw material.
Analiza wpływu udziału wiórów i włókien modrzewiowych na wybrane właściwości płyt wiórowo-włóknistych. W pracy przedstawiono wyniki badań wpływu dodatku włókien i wiórów pozyskanych z drewna modrzewia europejskiego (Larix decidua Mill.) pochodzącego z upraw plantacyjnych, na wybrane właściwości płyt wiórowo-włóknistych, w porównaniu z płytami o tej samej budowie bazującymi na typowym surowcu przemysłowym (drewnie sosnowym) używanym przez europejski przemysł płyt drewnopochodnych. Różnice wykazano w badaniach tj.: wytrzymałość na zginanie statyczne (MOR), moduł sprężystości przy zginaniu statycznym (MOE), wytrzymałość na rozciąganie prostopadle do płaszczyzn (IB), spęcznienie na grubość po moczeniu w wodzie oraz profil gęstości. W badaniach MOR i MOE płyty modrzewiowe z minimum 50%-owym udziałem włókien charakteryzowały się porównywalnymi względem płyt sosnowych wartościami oznaczonych właściwości, natomiast w pozostałych wariantach lepszymi właściwościami charakteryzowały się płyty wytworzone z drewna sosnowego. Płyty modrzewiowe w większości wariantów odznaczały się zdecydowanie niższymi wartościami spęcznienia na grubość (wyjątek stanowiły płyty wykonane z włókien), niż płyty z drewna pochodzącego z upraw leśnych. Profil gęstości płyt na przekroju poprzecznym wykonanych z surowca plantacyjnego nie odznaczał się różnicami względem płyt wykonanych z surowca sosnowego.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology; 2020, 111; 43--52
1898-5912
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Dunkeld larch (Larix x marschlinsii Coaz) in Estonia
Autorzy:
Sander, H
Laanelaid, A.
Powiązania:
https://bibliotekanauki.pl/articles/41729.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
larch
Japanese larch
Larix kaempferi
European larch
Larix decidua
Dunkeld larch
Larix x marschlinsii
Estonia
cumulative growth
dendrochronology
introduction history
tree age
Opis:
It is commonly known that Japanese larch, Larix kaempferi was first introduced in Europe in Great Britain in 1861. In the presence of European larches, L. decidua it was not long before the first hybrids between these species, called Dunkeld larches (Larix × marschlinsii), emerged there. It was found that there were several hybrid larch trees in Estonia that sprouted before one of their parent species was introduced in Europe. One of the oldest Dunkeld larches growing in Tallinn is about 210 years old. The radial growth of three Dunkeld larches in Estonia (in the cities of Pärnu and Tallinn and in the manor park of Suure-Kambja) and the determination of their age by cumulative growth graphs are discussed, with consideration given to the available knowledge on the introduction of Japanese larch. The conclusion is that there may have existed earlier alternative introduction routes of Japanese larch into northern Europe via Russia.
Źródło:
Dendrobiology; 2007, 57; 73-80
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Genetic Studies of Wood Structure Using an Optical Fibre Analyser
Badania genetyczne struktury drewna z wykorzystaniem optycznego analizatora włókien
Autorzy:
Klisz, M
Wojda, T
Powiązania:
https://bibliotekanauki.pl/articles/232964.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
optical analyzer
fibre length
genetic parameters
wood quality of European larch
produkcja papieru
wymiary włókien
parametry genetyczne
jakość drewna
Opis:
An automatic fibre size analyser - KajaaniFiberLab was used in studies designed to examine and analyse the genetic basis of fibre size variability. Fast and accurate measurement in accordance with the standards may, however, give incorrect results due to errors associated with the multi-staged maceration of wood samples to obtain disintegrated fibre water suspension. Errors in fibre size estimation may occur throughout studies of the increment cores of living trees. Nevertheless the results obtained from the Kajaani analyser allow for the estimation of fibre sizes (length, width and cell wall thickness) with a precision comparable to that in studies using traditional measurement techniques, which is why these results may be used to estimate genetic parameters of the traits mentioned - heritability and genetic correlation. Such parameters are applied when making decisions concerning the management of forest stands and plantations of fast-growing trees. On the basis of the results of measurements of the biometric parameters of fibres, we obtained high values of genetic parameters (heritability and genetic correlations) for the traits of the European larch analysed. Those results allow for the achievement, with a high level of probability,of the breeding objective through selection directed at the improvement of the properties of timber produced in plantations of fast-growing trees.
Wymiary włókien, są obok zawartości celulozy, lignin i hemicelulozy, jedną z najważniejszych cech drewna przetwarzanego w procesie produkcji papieru. Analizator KajaaniFiberLab 1.3, obok klasycznych badań właściwości papieru, umożliwia przeprowadzenie analiz pod kontem genetycznych uwarunkowań zmienności właściwości drewna istotnych dla produkcji przemysłowej papieru analizator wykorzystuje spolaryzowane światło laserowe do obrazowania włókien za pomocą wysokiej rozdzielczości kamery CCD. Cyfrowa technika obrazowania pozwala przeprowadzić pomiary wymiarów elementów anatomicznych drewna. Zastosowanie tej metodyki umożliwia dokonywanie pomiarów w czasie przepływu zawiesiny włókien przez kapilarne rurki analizatora. Podczas badań zmienności struktury drewna modrzewia europejskiego, określono genetyczne podłoże kształtowania się wymiarów włókien. Określono kluczowe parametry genetyczne dla długości i szerokości włókien, jak również grubości ściany komórkowej włókien.
Źródło:
Fibres & Textiles in Eastern Europe; 2014, 4 (106); 117-120
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preliminary results of studies on the effects of organic fertilization and mulching on the growth of one-year old European larch (Larix decidua Mill.) seedlings and occurrence of soil mites under micro-sprinkler irrigation in two sylvan-natural regions of Poland
Autorzy:
Rolbiecki, R.
Rolbiecki, S.
Klimek, A.
Podsiadlo, C.
Powiązania:
https://bibliotekanauki.pl/articles/60215.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
organic fertilization
mulching
plant growth
one-year-old plant
European larch
Larix decidua
seedling
occurrence
soil mite
mite
micro-sprinkler irrigation
Polska
forest region
sewage sludge
bark
sawdust
Acari
Oribatida
Opis:
The aim of the study was to determine the influence of organic fertilization and mulching on the seedling vigour of European larch (Larix decidua Mill.) and occurrence of soil mites (Acari) in forest- and post-arable soils. Two different nursery experiments were carried out in the vegetation period of the year 2005 on light soils at two sylvan-natural regions of Poland. The first trial was conducted at Białe Błota near Bydgoszcz – on a brown podzolic soil. The second experiment – at Lipnik near Stargard Szczeciński – on an acid brown soil. The higher was the rainfall amount during the vegetation period, the lower was the seasonal irrigation rate supplied to European larch seedlings. Because of this the seasonal irrigation water rate applied at Białe Błota was higher than that at Lipnik. European larch seedlings grown on the forest soil were characterized by the increased height and the fresh mass than those cultivated on the post-arable ground. Seedlings grown in the forest soil on treatments mulched with litter were characterized by the increased height and the fresh mass of above-ground parts as compared to those cultivated on control plots (without mulching). Mulching with litter increased the number of mites, especially oribatid mites, as well as their species diversity. It can be recognized as the result of the positive influence of the mulching on the biological properties of the studied soils.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2008, 06
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-7 z 7

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