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    Wyświetlanie 1-5 z 5
    Tytuł:
    Charakterystyka techniczna drewna modrzewia dahurskiego (Larix gmellini (Rupr.) Kuzen.)
    Characteristics of technical properties of Dahurian larch (Larix gmellini (Rupr.) Kuzen.) wood
    Autorzy:
    Jankowska, A.
    Anders, B.
    Wójcik, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/980329.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    modrzew dahurski
    Larix gmelinii
    drewno modrzewiowe
    budowa drewna
    budowa mikroskopowa
    charakterystyka techniczna
    wlasciwosci fizyczne
    wlasciwosci mechaniczne
    larch
    mechanical properties
    physical properties
    brown rot fungus
    wood anatomy
    Opis:
    The wood present in trade in Poland named as ‘Siberian larch’, in fact belongs to two tree species: Larix sibirica Ledeb. and Larix gmelinii (Rupr.) Kuzen. The term itself is rather associated with the origin of wood. While Larix sibirica wood is the subject of many research, characteristics of Larix gmelinii still require additions. The main aim of this paper was to describe the technical properties of Dahurian larch wood. We characterised also the microstructure of the wood. Moreover, durability against fungi−caused brown rot was tested. The wood from the Chabarowsk area (Russia) was tested. The properties of wood were determined in accordance with the recom−mendations of the Polish standards. The obtained results allow to conclude that Dahurian larch wood is characterized by medium shrinkage and typical shrinkage anisotropy (total radial shrinkage was 5.0% and in the tangential direction 7.6%). With the average density of this wood in an air−dry state equal to 620 kg/m3, average mechanical properties are associated – modulus of elasticity 12.5 GPa and Janka hardness on the cross−section of 57 MPa. These values are similar to those of Siberian larch. Dahurian larch heartwoods is characterized by low durability (4th class of natural durability to fungi in a 5−degree scale). It causes that wood used in external environment require special attention and use of wood preservatives.
    Źródło:
    Sylwan; 2019, 163, 01; 47-54
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ Bacillus subtilis i Trichoderma asperellum na rozwój sadzonek brzóz zainfekowanych patogenem drobnych korzeni Phytophthora plurivora
    Influence of Bacillus subtilis and Trichoderma asperellum on the development of birch seedlings infected with fine root pathogen Phytophthora plurivora
    Autorzy:
    Oszako, T.
    Żółciak, A.
    Tulik, M.
    Tkaczyk, M.
    Stocki, M.
    Nowakowska, J.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/985763.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    fitopatologia lesna
    brzoza brodawkowata
    Betula pendula
    sadzonki
    fytoftoroza
    Phytophthora plurivora
    rozwoj roslin
    grzyby antagonistyczne
    Trichoderma asperellum
    bakterie antagonistyczne
    Bacillus subtilis
    oomycetes
    bacterium
    fungus
    interactions
    betula pendula
    Opis:
    Phytophthora pathogens cannot be controlled with well−known fungicides, because as oomycetes they do not synthesize chitin and ergosterol. Phytopathogenic microorganisms of Phytophthora genus offers an alternative to pesticides. The aim of the study was to understand the interactions among the host silver birch (Betula pendula), a common forest tree species in Polish lowlands and in lower mountain locations, and its primary pathogen Phytophthora plurivora as well as potential Biological Control Agents Bacillus subtilis and Trichoderma asperellum. The 2−year−old silver birch seedlings were selected for this experiment. Interactions between P. plurivora and B. subtilis, producing peptide antibiotics including polymyxin B and subtiline, stimulated growth of birch seedlings. Comparing to the control a stimulation of both height and root collar diameter of plants was observed when B. subtilis was added into the soil of pots. It is a saprophyte, decomposing organic compounds of plant origin. However, the application of bacterium into the rhizosphere soil stimulated more shoots growth than roots. The application of T. asperellum into the soil stimulated development of roots, and in consequences the above−ground parts of plants. However, in the combination with pathogen, T. asperellum protected the roots only partially. The presence of pathogen and its antagonists increases the biomass of birches compared to control plants. Chlorophyll fluorescence studies proved better parameters like total performance index (PI total) after application of B. subtilis, in contrast, interaction between B. subtilis and P. plurivora negatively affected photosynthesis causing weakening of plants. The higher content of carboxylic acids, observed in the variant with T. asperellum + P. plurivora, indicates the initiation of biochemical defence processes in birch leaves cells.
    Źródło:
    Sylwan; 2019, 163, 12; 1006-1015
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Charakterystyka techniczna drewna limby syberyjskiej (Pinus sibirica Du Tour.)
    Characteristic technical properties of Siberian yellow pine (Pinus sibirica Du Tour.) wood
    Autorzy:
    Jankowska, A.
    Anders, B.
    Mastyna, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/986686.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewnictwo
    limba syberyjska
    Pinus sibirica
    drewno limbowe
    charakterystyka techniczna
    wlasciwosci mechaniczne
    wlasciwosci fizyczne
    anatomia drewna
    odpornosc na biodegradacje
    siberian yellow pine
    mechanical and physical properties
    brown rot fungus
    wood anatomy
    Opis:
    Siberian yellow pine (Pinus sibirica Du Tour.) has increasingly appeared in the merchant offers on the market of raw wood materials in Poland. However, the knowledge of the technical characteristics of its wood is still insufficient for it is based primarily on the data and experiences from abroad, often from the literature of the former USSR. The main aim of this study was to determine selected physical and mechanical properties of Siberian yellow pine wood such as linear and volumetric shrinkage, compressive strength along the fibers, the tensile strength along the fibers, the tensile strength across the fibers, static bending and modulus of elasticity, flexural dynamic and impact strength, hardness, resistance to splitting and cleavage amd shear strength. Futhermore, the resistance to decay caused by Coniophora puteana (Schum., Fr.) Karst., as well as the examination of the wood structure, assessing the dimensions and arrangement of the structural elements in particular were conducted. The results show that Siberian yellow pine wood has a number of similarities to Scots pine wood in terms of the structure. The wood is very light, with a density of 391 kg/m3 and very soft (Janka hardness on transverse cross section 23 MPa). The mechanical properties of Siberian yellow pine wood are closely related to its density and much lower when compared with Scots pine. Shear strength equalled to 67 MPa, static bending strength – 65 MPa and compression strength along the fibers – 49 MPa. The durability to brown rot fungus of Siberian pine wood is comparable to Scots pine (3rd class according to PN−EN 350−2:2000).
    Źródło:
    Sylwan; 2017, 161, 09; 756-762
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pory roku a zbiorowisko grzybów zasiedlających pniaki czeremchy amerykańskiej
    Seasonal changes in fungi colonies inhabiting black cherry stumps
    Autorzy:
    Baranowska, M.
    Korzeniewicz, R.
    Kartawik, N.
    Behnke-Borowczyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/979585.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewa lesne
    gatunki inwazyjne
    czeremcha amerykanska
    Prunus serotina
    fitopatologia
    pniaki czeremchy
    grzyby zasiedlajace drewno
    grzyby mikroskopowe
    identyfikacja
    system Illumina
    pory roku
    illumina system
    invasive species
    dead wood
    saprotrophs
    wood−decay fungus
    Opis:
    Black cherry is an important invasive species in forest ecosystems in Poland. It developed mainly in Scots pine stands. The aim of the study was to identify microscopic fungi colonies inhabiting black cherry stumps. In the spring of 2017, wood samples were collected from stumps created after cutting in each subsequent month of 2016 in the Podanin Forest District (19°28'00'E, 52°04'00'N). Stumps up to 5 cm and more than 5 cm in diameter were selected for the study. In total, 72 discs from the first stage of the decomposition of wood were collected. The discs were drilled to obtain fine sawdust for further analysis. The trials were divided into four periods. DNA isolation was performed using the Plant Genomic DNA purification kit (ThermoScientific). The ITS1/2 rDNA region was used for species identification. The analysis was carried out using specific primers. The obtained product was purified and sequenced using the Illumina SBS technology. The resulting sequence was compared using the BLAST algorithm with reference sequences from the NCBI database. The communities of fungi inhabiting the black cherry stumps differed from each other. The highest number of taxa was identified in samples from stumps over 5 cm sheared in autumn and winter, while the lowest in stumps up to 5 cm sheared in spring and winter. Fungi belonging to the Ascomycota and Basidiomycota, Blastocladiomycota, Glomeromycota, Zygomycota and non−cultivable fungi and organisms belonging to other kingdoms were identified. Saprophytes from Menispora sp. dominated on the analysed stumps. The collection of fungi of larger stumps was more diverse and more numerous than on stumps with a smaller diameter. A greater diversity of taxa was distinguished by the stumps of tree fallen in the growing season. The majority of the analyzed samples were dominated by Ascomycota. Basidiomycota clusters dominated in the winter. The predominant share of saprotrophs shows the distribution of stumps. The most desirable effect of the research would be the indication of naturally occurring saprotroph, whose operation would reduce the black cherry’s yield strength. The applied method of sequencing based on the Illumina System was effective to determine the composition of the fungal population.
    Źródło:
    Sylwan; 2019, 163, 10; 872-880
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wzrost odnowień na gruntach porolnych prowadzonych w ramach przebudowy drzewostanu metodą sztucznych luk
    Growth of broadleaved species on post-agricultural lands introduced during the process of stand conversion with a use of artificial gaps
    Autorzy:
    Zachara, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1291881.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    grunty porolne
    hodowla lasu
    odnowienia lasu
    sosna zwyczajna
    Pinus sylvestris
    huba korzeni
    przebudowa drzewostanow
    luki drzewostanowe
    gatunki domieszkowe
    dab bezszypulkowy
    buk zwyczajny
    lipa drobnolistna
    przebudowa drzewostanu
    dąb bezszypułkowy
    Scots pine
    root-rot fungus
    forest conversion
    sessile oak
    common beech
    small-leaved lime
    Opis:
    This paper presents results on the restoration of Scots pine stands established on post-agricultural lands undergoing conversion into mixed stands. Sessile oak (Quercus petraea), common beech (Fagus sylvatica) and small-leaved lime (Tilia cordata) seedlings were planted in artificially created gaps (0,02 ha to 0,05 ha each) cut in six experimental plots (Forest Districts: Bielsk, Krynki, Sobibór, Dobieszyn, Skrwilno and Łupawa) located in 20–25-years-old pine stands. The experimental plots were spread across northern, central and eastern Poland and affected by root-rot fungus (Heterobasidion annosum). Nine years after planting, the number of individual trees and shrub species, their height sum and average height were calculated for fenced artificial gaps (LSO) as well as non-fenced artificial gaps (LSN) and compared to natural gaps (LN) and non-disturbed neighboring stands (D). Results were calculated separately for the planted species (oak, lime and beech) but combined for all other species. The results indicate satisfactory restoration in all of the investigated plots except in Krynki, which is located in a relatively poor site. Significant differences appeared between height sum as well as average height of planted species in fenced compared to non-fenced gaps. Furthermore, in both, natural and artificial gaps, the species composition of the young generation was enriched with natural regeneration of pioneer species, mainly silver birch (Betula pendula), rowan (Sorbus aucuparia) and aspen (Populus tremula).
    Źródło:
    Leśne Prace Badawcze; 2019, 80, 4
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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