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    Wyświetlanie 1-8 z 8
    Tytuł:
    Taxus baccata in Morocco: a tree in regression in its southern extreme
    Autorzy:
    Romo, Angel
    Iszkuło, Grzegorz
    Taleb, Mohammed Seghir
    Walas, Łukasz
    Boratyński, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/956808.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    dakhs
    ecology
    forestry
    phytogeography
    plant conservation
    niche modelling
    Opis:
    The knowledge on chorology of species is basic for biogeographic and ecological studies and for conservation actions. The data on the chorology of Taxus baccata in Morocco have not been studied. The bibliographic resources, herbarium material, unpublished data of several botanists and the authors’ field notes have been reviewed. Two yew populations on Jbel Lakrâa in the Rif and near Bekrit in the Middle Atlas were measured to verify demographic structure and health conditions. The Maxent model of predicted habitat based on bioclimatic variables was used to evaluate the potential geographic range of T. baccata. The species occurs in the mountain areas of northern Morocco: in the Rif, the Middle and High Atlas, at altitudes between (500) 1200 and 2000 (2350) m. In the High Atlas, it reaches its southernmost locations within the geographic range. The populations represented by the highest number of individuals are found in the Western Rif and Middle Atlas, while from the High Atlas only single, isolated individuals are known. The yew occurred preferably in forests of Cedrus atlantica, Abies maroccana, groves of Betula fontqueri, Ilex aquifolium and Prunus lusitanica and in riparian forests located in narrow gorges. Seedlings were observed only at single localities. The population of T. baccata in the Rif presented a good health condition with successful regeneration, while the population in the Middle Atlas was in a much worse state, where only 4–8 m high yews were observed, without natural regeneration. The Maxent model of predicted habitat, based on bioclimatic variables, suggests that T. baccata could occur today in much broader mountainous areas in Morocco, especially in the Rif and Middle Atlas. However, the progressive decline of this species in Morocco indicates the significant importance of other factors on yew distribution, including microsite conditions and human pressure. Taxus baccata in Morocco is in regression at most of its localities and should be treated as a vulnerable species. Measures to ensure the yew’s conservation are needed, especially at its southernmost localities in the High Atlas.
    Źródło:
    Dendrobiology; 2017, 78; 63-74
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quality of Japanese larch stands in Poland
    Autorzy:
    Filipiak, M
    Pilarek, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/41203.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    forest productivity
    forestry
    stand
    Larix kaempferi
    Polska
    acclimation
    Japanese larch
    Opis:
    The quality of 39 Japanese larch stands, mainly in north-western Poland, was characterized. On the basis of the presented results it can be concluded that properly managed forest stands of Japanese larch can compete in trees quality with stands of native larches. The alien species is more susceptible to a lower stand density and exposure to strong winds. This is no correlation between forest stand quality and growth dynamics.
    Źródło:
    Dendrobiology; 2003, 49
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of Alnus subcordata for urban environments through assessment of drought and flooding tolerance
    Autorzy:
    Sjöman, H.
    Levinsson, A.
    Emilsson, T.
    Ibrahimova, A.
    Alizade, V.
    Douglas, P.
    Wiström, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2078229.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    climate change
    ecosystem services
    urban forestry
    stress tolerance
    adventitious roots
    Opis:
    The urban environment is stressful and trees experience multiple stresses, including drought, flooding, and extreme heat, all of which are likely to increase under future climate warming and increasing urbanisation. In the selection of tree species to maximise ecosystem services, tolerance to site characteristics such as flooding and severe drought is of critical importance. This study evaluated the suitability of a rare species, Alnus subcordata C.A. Mey (Caucasian alder) from the Hyrcanian forests of southern Azerbaijan, for its functionality as an urban tree. A total of 48 pot-grown, two-year-old saplings of A. subcordata were tested in a greenhouse experiment using a complete randomised block design. Each block contained four replicates of three treatments (waterlogging, drought, control), with 16 plants per treatment. Height differences between treatments were measured, and water status was estimated by determination of midday leaf water potential (ΨL) and stomatal conductance (gs ). To estimate drought tolerance reaction in the treatments, leaf water potential at turgor loss (ΨP0) was used together with broken-stick modelling of water status over time. There was a significant difference in tree height between the different treatments. In the drought treatment, A. subcordata plants showed no height increase, while plants in both the waterlogged and control treatments increased in height during the nine-week experiment. Over 63 days of flooding, plant water status was slightly more negative in the waterlogging treatment, but did not deviate essentially from the control. In the drought treatment, plant water status rapidly deviated from the control. There was a significant difference in ΨP0 between treatments, with drought-treated plants showing the lowest value (−2.31 MPa). This study demonstrated that A. subcordata has limited tolerance to drought and seems to rely more on water loss-avoiding strategies. However, the species may be usable at periodically waterlogged sites, due to its high tolerance to flooding. It could therefore be recommended for wet urban environments and stormwater management facilities, for which reliable guidance on suitable trees is currently lacking.
    Źródło:
    Dendrobiology; 2021, 85; 39-50
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Conifer somatic embryogenesis: II. Applications
    Autorzy:
    Cyr, D R
    Klimaszewska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/41451.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    plantation forestry
    somatic seedling
    application
    somatic embryogenesis
    Pinaceae
    embryogenesis
    germplasm preservation
    clonal propagation
    Opis:
    Somatic embryogenesis (SE) of conifers for clonal propagation has emerged from its earliest beginnings in 1980 to become an integral component of tree improvement strategies. With its capacity for long-term germplasm preservation and scale-up technologies,it is seen to be the preferred avenue to accelerate selection and operational deployment of value-added genotypes. At present,programs for numerous species from the Pinaceae family are underway worldwide,with activities ranging from selection trials to pilot production for plantation forestry. This paper will provide a review of current efforts in conifer SE including cryopreservation,commercialization and deployment strategies,and transgenics. A discussion of challenges and issues is directed at genetic fidelity, intellectual property and future needs.
    Źródło:
    Dendrobiology; 2002, 48
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Practical use of the mycorrhizal fungal technology in forestry, reclamation, arboriculture, agriculture, and horticulture
    Autorzy:
    Marx, D H
    Marrs, L.F.
    Cordell, C.E.
    Powiązania:
    https://bibliotekanauki.pl/articles/41164.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    root system
    forestry
    agriculture
    Ectomycorrhizae
    mycorrhizal fungal technology
    practical treatment
    forest tree
    reclamation
    horticulture
    Opis:
    Fine nonwoody roots (<2 mm) of plants, which are responsible for most mineral and water absorption, are located in the upper 20 to 30 cm of soil. The rhizosphere, the zone around these fine roots, supports diverse microorganisms in great numbers. Dynamic rhizosphere processes involve microbial saprophytic, pathogenic, and symbiotic associations with plants. Certain species of saprophytic bacteria oxidize mineral elements, like P, into soluble forms, fix atmospheric N, stimulate root growth by producing plant growth regulators, act as biological deterrents to root-disease causing organisms, and decompose man-made and natural organic chemicals in the rooting zone. The major symbiotic associations on plant roots are mycorrhizae. There is considerable published research in the world literature proving the biological, physiological and ecological significance of ectomycorrhizae and vesicular-arbuscular mycorrhizae (VAM) to the survival, growth, development and health of many species of agricultural and horticultural plants, and of forest trees. This information is critical to our understanding of plant growth and development and their ecology. In the past, the limiting factors in the practical management of mycorrhizal fungi in plant production have been the availability of affordable and good quality inocula of the ectomycorrhizal and VAM fungi and the development of simple methods to apply these inocula either to the soil or to the roots of plants. It was only after these protocols were developed that scientists could then test under "real-world" conditions the practical and economic significance of the management of these fungi in plant productivity. Many of the problems associated with commercial inoculum production have been eliminated allowing the production of quality products containing ectomycorrhizal and/or VAM fungal propagules to diverse plant markets. These fungal products are being commercially applied to plants in diverse green markets. The results of their application are improved survival, growth and productivity of forest trees and other woody plants on reforestation, urban and reclamation sites, horticultural crops such as those grown in woody ornamental nurseries and various agricultural crops grown in fumigated soils. This presentation is a brief review of the research and operational applications done in support of the practical use of the mycorrhizal fungal technologies in forestry, reclamation, horticulture and agriculture.
    Źródło:
    Dendrobiology; 2002, 47
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tree somatic embryogenesis in science and forestry
    Autorzy:
    Hazubska-Przybyl, T.
    Bojarczuk, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/41255.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    tree
    somatic embryogenesis
    embryogenesis
    science
    forestry
    in vitro culture
    seedling
    somatic seedling
    forest management
    Opis:
    Somatic embryogenesis is the latest, and potentially the most efficient, method for the vegetative micropropagation of plants. Over the past three decades, numerous laboratory studies have investigated somatic embryogenesis of forest trees, yielding positive results for a number of economically important tree species. The first test trials were run and plantations were planted with interior spruce in the 90s by CellFor Inc. (Canada). However, at the beginning of the XXI century, the program to produce spruce and Douglas fir somatic seedlings was stopped for economic reasons. Thus, currently no operational program is ongoing except on a small scale in New Brunswick. In order to integrate somatic embryogenesis technology into operational reforestation programs, the production costs of forest tree somatic seedlings needs to be reduced, and the awareness of foresters and forest landowners that the material obtained through somatic embryogenesis is valuable needs to be increased. This awareness would enable implementation of this technology on a large scale for production and forest management throughout Europe including Poland. In this review, the importance of somatic embryogenesis in scientific research and in global and European forestry is presented. Our main aims are to provide basic information on the challenges in researching somatic embryogenesis of forest trees and to raise interest in this tree propagation technique in both scientists and foresters.
    Źródło:
    Dendrobiology; 2016, 76
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of four methods for estimating relative solar radiation in managed and old-growth silver fir-beech forest
    Autorzy:
    Rozenbergar, D.
    Kolar, U.
    Cater, M.
    Diaci, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/41259.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    solar radiation
    old-growth silver fir forest
    beech forest
    forest
    light condition
    forestry
    hemispheric photography
    Opis:
    Methods based on the principle of hemispherical canopy projection, including hemispherical photography (digital andfilm), sensors like LAI 2000 (zenith cutoff anle 74,1°) andstable horizontoscope, represent less accurate, yet significantly less expensive andtime-consuming techniques for radiation measurements comparedto long-term measurement with a network of photosynthetically active radiation (PAR) sensors. With measurements taken at a single point in time they can provide reliable estimates of relative diffuse andd irect solar radiation andcan also be usedto estimate the light climate in different times of the year. The four above mentioned methods for solar radiation estimation were applied at the same points in gaps and under adjacent canopies in unevenaged, mixed Dinaric fir-beech and pure beech montane forests. Locations covereda range of radiation andstandstructure conditions. Data analyses showedgoodreliability of all four methods over the whole range (2–80%) of radiation conditions. The most comparable results come from LAI 2000 andfilm hemispherical photography (all R > 0.90). Digital hemispherical photography is an accurate andreliable (R = 0.89) replacement for film hemispherical photography, but the higher values estimatedfor direct radiation should be taken into account. Compared to the other three methods, the stable horizontoscope gives less accurate results, especially under canopies with poorly defined gaps. Our study showed that all four methods tested are suitable for estimating the solar radiation climate in gaps and stands with heterogeneous vertical structures, andhave potential value as a tool in decision making when practicing silviculture.
    Źródło:
    Dendrobiology; 2011, 65
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Importance of investigations carried out by Professor Bolesław Suszka in population genetics of forest trees
    Autorzy:
    Sabor, J
    Powiązania:
    https://bibliotekanauki.pl/articles/41481.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    selection programme
    forestry
    gene bank
    selection breeding
    forest nursery
    plant genetics
    Suszka Boleslaw
    forest tree
    population genetics
    Opis:
    Modern forest selection programs concern natural and protected populations of trees characterized by a great genetic variability and also production stands frequently deformed by human activity. In the latter, artificial regeneration is prevailing. Forest nurseries working in the organizational structures of State Forests can guarantee the proper provenance (genotype)of seeds and the quality of seedlings obtained from them. The condition, however, is a close uniformity in the conservation of forest gene resources, and selection breeding of forest trees. The success of the program depends also on the development of modern infrastructure for forest nurseries and applied technologies. The latter task was the field of activity of Professor Bolesław Suszka, Ph.D., and his many-year research and organizational and didactic activity in Poland and abroad. The methods in long-term storage and their pretreatment in case of dormant seeds, developed by Professor Suszka, created the theoretical and practical basis for the conservation of forest gene resources not only in Poland.
    Źródło:
    Dendrobiology; 2002, 47 Supplement
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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