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    Wyświetlanie 1-4 z 4
    Tytuł:
    Lasy falowe, czyli o niezamierzonym lecz nieprzypadkowym podobieństwie pomiędzy rębnią Wagnera i lasami naturalnymi
    Wave forests – not intended but not accidental similarity between Wagners Blendersaumschlag silvicultural system and natural forests
    Autorzy:
    Bolibok, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1035857.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    drzewostany
    rebnie brzegowo-smugowe
    odnowienia lasu
    hodowla lasu
    inicjowanie odnowien
    lasy falowe
    las naturalny
    struktura przestrzenna
    lesnictwo
    wave forest
    wave−regenerated forests
    shimagare forest
    wagner's blendersaumschlag silvicultural system
    natural forests
    Opis:
    A characteristic spatial structure of natural forests called „wave forest” or „Shimagare forest” is very similar to structure which is shaped by silvicultural system invented by Christopher Wagner. This review presents regions of occurrence, mechanisms of arising and maintenance of mentioned natural forests and compares them with theory and praxis of Wagner's Blendersaumschlag.
    Źródło:
    Sylwan; 2003, 147, 10; 16-24
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of GPR surveys for assessment of trees condition in urbanized areas
    Autorzy:
    Mazurek, E.
    Łyskowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/184198.pdf
    Data publikacji:
    2014
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    GPR
    tree
    EM wave
    forest management
    Opis:
    Modern measuring equipment is sometimes used for applications, for which it has not been originally designed. For example Ground Penetrating Radar (GPR), designed for subsurface structures analysis, can be used for tree tomography. Radar utilizes the phenomenon of propagation of the electromagnetic waves in a physical medium. Measurements can be carried out in situ, in a non-invasive manner on a living tree. Collected data allow for the tree condition determination. It is possible to detect voids and internal structure. Geophysical investigations can provide an estimation of the risk of falling of the trees. These methods also allow determination of the production quality of the tree by detecting knots inside the structure. Available literature shows only limited examples of the usage of other geophysical surveys, such as the ultrasound and geoelectrical method. However, in many cases these measurements are performed on samples in the form of profiles cut from the felled trees. Presented study was conducted on a set of 8 ash trees growing in the Krakow city parks. The measurement was carried out with high frequency antenna – 1600 MHz. Due to the lack of available literature and limited experience of the authors, only trees with known condition were tested. Despite many attempts, the authors were not able to developed a reliable measurement methodology which would allow for unambiguous classification and interpretation of results. In most cases, the results of the study permitted determination of the trees condition. However, some echograms, of the surveyed trees with visible voids pointed to a different tree state and misclassification. Despite that, the research results seem to be promising and the authors believe in the usefulness of the further development of measurement method along with its extension to other trees species.
    Źródło:
    Geology, Geophysics and Environment; 2014, 40, 3; 291-296
    2299-8004
    2353-0790
    Pojawia się w:
    Geology, Geophysics and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of mangrove forest structures on wave attenuation in coastal Vietnam
    Autorzy:
    Bao, T.Q.
    Powiązania:
    https://bibliotekanauki.pl/articles/48094.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    brackish water
    coastal region
    forest structure
    mangrove forest
    marine environment
    river mouth
    saline water
    storm
    terrestrial environment
    Vietnam
    water quality
    wave
    wave attenuation
    Opis:
    This paper analyses wave attenuation in coastal mangrove forests in Vietnam. Data from 32 mangrove plots of six species located in 2 coastal regions are used for this study. In each plot, mangrove forest structures and wave height at different cross-shore distances are measured. Wave height closely relates to cross- shore distances. 92 exponential regression equations are highly significant with R2 >0.95 and P val. <0.001. Wave height reduction depends on initial wave height, cross-shore distances, and mangrove forest structures. This relationship is used to define minimum mangrove band width for coastal protection from waves in Vietnam.
    Źródło:
    Oceanologia; 2011, 53, 3
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experiments on wave motion and suspended sediment concentration at Nang Hai, Can Gio mangrove forest, Southern Vietnam
    Autorzy:
    Hong Phuoc, V.L.
    Massel, S.R.
    Powiązania:
    https://bibliotekanauki.pl/articles/47937.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    subtropical zone
    marine environment
    trophodynamic process
    Vietnam
    mangrove forest
    biogeochemical process
    concentration
    Can Gio area
    wave motion
    suspended sediment
    Opis:
    Biogeochemical and trophodynamic processes as well as hydrodynamic factors play a major role in the structure and function of mangrove ecosystems. This study outlines field experiments on wave motion and suspended sediment concentration carried out at Nang Hai, Can Gio mangrove forest, Southern Vietnam. Pressure sensors were used to measure sea surface elevation, and Optical Backscatter Sensors (OBS) were applied to detect infrared (IR) radiation scattered from suspended particles in order to measure turbidity and suspended sediment concentrations. The experimental results indicate that most of the energy is dissipated inside the mangrove forest as a result of wave-trunk interactions and wave breaking. The suspended sediment concentration depends on wave intensity and tidal current velocity. Wave action is one of the main factors forcing sediment transport and coastal erosion at the study site; even the wave field at the study site is not so strong. The establishment of mangrove vegetation can encourage the deposition of sediment, or at least the retention of the flood-tide sediment influx.
    Źródło:
    Oceanologia; 2006, 48, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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