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    Wyświetlanie 1-8 z 8
    Tytuł:
    Czynniki wplywajace na zroznicowanie zageszczenia populacji borsuka [Meles meles L.] w Polsce
    Autorzy:
    Borowski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/818900.pdf
    Data publikacji:
    2001
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    dostepnosc pokarmu
    preferencje srodowiskowe
    fauna
    Meles meles
    borsuk
    Polska
    lasy
    preferencje pokarmowe
    populacje zwierzat
    lesnictwo
    zageszczenie populacji
    Źródło:
    Sylwan; 2001, 145, 03; 33-42
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Czynniki wpływające na zmiany zwięzłości gleb leśnych podczas pozyskiwania surowca drzewnego
    Factors affecting the changes in penetration resistance of forest soils during timber harvesting
    Autorzy:
    Kulak, D.
    Stańczykiewicz, A.
    Szewczyk, G.
    Lubera, A.
    Strojny, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/989881.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewostany sosnowe
    trzebiez pozna
    pozyskiwanie drewna
    metody pozyskiwania drewna
    oddzialywanie na glebe
    gleby lesne
    ugniatanie gleby
    zwiezlosc gleb
    timber harvesting
    mechanized
    motor−manual
    soil penetration resistance
    Opis:
    The objective of the studies was to determine the penetration resistance (cohesion) of soil compacted at timber harvesting in Scots pine stands subjected to late thinning. The scope of the investigations was limited to two technologies – the mechanized one, using a harvester−forwarder machine set, as well as the motor−manual one, employing petrol chainsaws and a farm tractor for forwarding and dragging of felled trees. The analyses were performed in central Poland, in the Staszów Forest District, for two habitats – fresh mixed coniferous forest and fresh mixed deciduous forest. The measurements of soil cohesion were taken with the use of Eijkelkamp 06.15.SA Penetrologger penetrometer along the five measurement lines situated perpendicularly to the main skidding track. The soil penetration resistance was measured in eight spots for every measurement line: in the middle of the left and right wheel−rut, between the wheel−ruts, on the left and right roadside within a distance of 0.5 and 1 m from the wheel−rut edge, and 10 m from the right wheel−rut; the latter location was treated as the reference. The mechanized timber harvesting caused stronger compaction of soil, particularly in wheel−ruts, where the recorded values of soil cohesion exceeded 3 MPa (fig. 1). For the technology with farm tractor for skidding, the greatest soil compaction was also encountered in wheel−ruts, reaching up to 2.5 MPa. With regard to both logging technologies, the analysis of variability in penetration resistance of the top 10−cm soil horizon revealed a statistically significant increase in soil compaction in wheel−ruts when compared with other measuring points along and nearby the skid track (fig. 2). The employed technology of timber harvesting and the degree of soil cohesion in wheel−ruts were proved to be correlated. In respect of the mechanized variant, the mean value of soil penetration resistance in the top 10−cm layer counted up to 2 MPa and was significantly greater than the one in motor−manual technology, where it did not exceed 1.3 MPa. No significant differences in soil compaction in reference to the investigated forest habitats were revealed, though it was stronger in fresh mixed coniferous forest, with regard to both technological variants. The motor−manual technology caused the increase in soil penetration resistance by 2% on the roadside, nearly 20% in the middle of the skid track and over 70% in wheel−ruts. While the mechanized logging operations resulted in 30% increase in soil cohesion on the roadside, 55% between the wheel−ruts and over 250% inside the wheel−ruts (fig. 3).
    Źródło:
    Sylwan; 2015, 159, 04; 318-325
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Czynniki wpływające na proces detekcji pojedynczych koron drzew na podstawie danych z lotniczego skanowania laserowego
    Factors influencing individual tree crowns detection based on airborne laser scanning data
    Autorzy:
    Stereńczak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1317982.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    drzewostany
    segmentacja
    korony drzew
    detekcja
    lotniczy skaning laserowy
    wysokosciowy model korony
    segmentation
    tree detection
    Crown Height Model
    accuracy
    Opis:
    Airborne laser scanning (ALS) technology allows accurate information about the forest environment to be obtained. The high precision of ALS allows the detection of individual trees. An individual tree is composed of many elements and requires relatively complex algorithms. Factors that determine and affect the accuracy of calculating the number of trees can be split into the following groups: biological factors, technical factors related to the flight and data acquisition parameters, technical factors related to data processing, problems of results verification. The article synthesizes the main problems arising during the development of methods for detection of individual trees and acquisition of their characteristics in a managed forest in Central Europe.
    Źródło:
    Leśne Prace Badawcze; 2013, 74, 4; 323-333
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Skład gatunkowy, wzniesienie nad poziomem morza i kategoria ochrony jako czynniki wpływające na intensywność zgryzania odnowień w Tatrzańskim Parku Narodowym
    Species composition, elevation, and former management type affect browsing pressure on forest regeneration in the Tatra National Park
    Autorzy:
    Bodziarczyk, J.
    Zwijacz-Kozica, T.
    Gazda, A.
    Szewczyk, J.
    Fraczek, M.
    Zieba, A.
    Szwagrzyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/45542.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    lowiectwo
    lasy gorskie
    odnowienia lasu
    naloty
    podrost
    gatunki roslin
    Sorbus aucuparia
    Salix caprea
    Abies alba
    Acer pseudoplatanus
    wysokosc nad poziomem morza
    ssaki kopytne
    szkody lowieckie
    zgryzanie
    obszary chronione
    Tatrzanski Park Narodowy
    stale powierzchnie obserwacyjne
    Opis:
    Effects of ungulate pressure on the development of young generation of trees is one of the most important issues in ecology and forestry. Ungulate pressure influence on the development of natural regeneration has been also reported from several national parks. Our study on the effects of ungulate browsing on the young generation of trees was conducted on more than 500 sample plots controlled during one growing season. The overall browsing pressure ranged from 7.6% in seedlings to 20.3% in low saplings. The pressure of ungulates on the regeneration of Picea abies, the dominant species in the Tatra National Park, was by and large below 1%. Broadleaved species were browsed more frequently. The relationship between the plot altitudes and browsing intensity was statistically significant for seedlings and low saplings; at the higher altitudes, the browsing pressure was greater. There was also observed a statistically significant relationship between the type of former management and the browsing degree in seedlings; in the areas subjected to “landscape protection”, the intensity of browsing was higher when compared to strictly protected areas. Pressure exerted by ungulates on tree regeneration was very unevenly distributed, i.e. some plots were heavily browsed and many others - not browsed at all. The most affected tree species were Salix caprea and Sorbus aucuparia, although the percentage of browsed individuals rarely exceeded 50%. Other species favored by ungulates was Acer pseudoplatanus; despite the high browsing pressure, this species was present among seedlings and tall saplings, suggesting that it would be able to recruit to the tree layer. Abies alba was browsed less frequently than the deciduous trees; however, among the tall saplings it was the third most browsed species.
    Źródło:
    Leśne Prace Badawcze; 2017, 78, 3
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Czynniki wpływające na wydajność i koszty zabiegów agrolotniczych wykonywanych na terenie Regionalnej Dyrekcji Lasów Państwowych w Pile w roku 2013
    Factors affecting the efficiency and costs of airborne spraying in Regional Directorate of the State Forests in Pila in 2013
    Autorzy:
    Majewski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/989879.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    RDLP Pila
    lasy
    szkodniki roslin
    barczatka sosnowka
    Dendrolimus pini
    piedzik przedzimek
    Operophtera brumata
    chrabaszcz kasztanowiec
    Melolontha hippocastani
    ochrona lasu
    zabiegi agrolotnicze
    zwalczanie szkodnikow
    opryski lotnicze
    wydajnosc
    koszty
    airborne spraying
    efficiency
    unit costs
    sprayed area
    Opis:
    The Sustainable Use Directive (2009/128/EC) establishes a framework for European Community action to achieve the sustainable use of pesticides imposed restrictions in agro−aviation pesticides application. As a result of the creation of buffer zones, part of the endangered area must be excluded from spraying and the area will be fragmented. This article evaluated the impact of the size, shape and distance between the sprayed area and the aerodrome, on the efficiency and cost of agro−aviation spraying in Regional Directorate of the State Forests in Piła (western Poland) in 2013. The efficiency of agro−aviation spraying is highly positively correlated with the shape and size of sprayed area. Weak negative correlation was found with the distance between the sprayed area and the aerodrome. The obtained efficiency ranged from 23.37 to 198.98 ha/h, while the costs covered the span from 61.96 to 423.34 zł/ha. The structure of unit costs varied depending on the spraying parameters. The costs of aircraft charter and purchase of pesticides are dominating part of the whole process. Variability of the spraying costs causes that their averaging distorts the results and makes it difficult to plan the future costs.
    Źródło:
    Sylwan; 2015, 159, 04; 289-299
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Możliwości ochrony lasu przed owadami uszkadzającymi systemy korzeniowe metodą biologiczną z wykorzystaniem grzybów entomopatogennych. I. Mechanizm zakażania owadów grzybami entomopatogennymi i czynniki wpływające na infekcję
    Possibility of forest protection against insects damaging root systems with the use of biological method based on entomopathogenic fungi. I. Mechanism of insects infection with entomopathogenic fungi and factors...
    Autorzy:
    Malinowski, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1009635.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    zwalczanie szkodnikow
    grzyby entomopatogenne
    biologiczne metody ochrony roslin
    Metarhizium anisopliae
    owady
    szkodniki korzeni
    ochrona lasu
    lesnictwo
    Verticillium lecanii
    Beauveria brongniartii
    insects infection
    entomopathogenic fungi
    beauveria brongniartii
    metarhizium anisopliae
    verticillium lecanii
    insects control
    Opis:
    The paper comprises basic knowledge on the mechanism of insects infection with entomopathogenic fungi (Beauveria brongniartii, Metarhizium anisopliae, Verticillium lecanii) and factors influencing this process. It depends on pathogen properties, host susceptibility, and biotic and abiotic elements of environment. Such information is useful to understand the slower effectiveness of mycoinsecticides than chemical insecticides.
    Źródło:
    Sylwan; 2009, 153, 12; 795-804
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tempo zarastania spał na jodle oraz niektóre czynniki na nie wpływające
    The rate of bark-stripping wound closure in fir and some factors affecting it
    Autorzy:
    Pach, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1012919.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    korony drzew
    lesnictwo
    spalowanie
    tempo zarastania
    szkody lowieckie
    spaly
    jodla pospolita
    uszkodzenia drzew
    Abies alba
    cechy morfologiczne
    zywotnosc
    zarastanie
    drzewa lesne
    abies alba
    bark−stripping damage
    wound closure
    wound characteristics
    live crown ratio
    tree vigour
    Opis:
    The paper presents results of the research conducted in the stands with fir stripped by red deer in the territory of the Forest Experimental Station in Krynica (Beskid Sądecki). The average rate of wound closure expressed in the width of wound closure and the time needed for a wound to heal was determined on the basis of detailed analyses of bark−stripping wounds in the cut trees. Factors influencing wound closure were identified as well. In addition, a multiple regression model explaining about 51% of the variation of the wound healing time was presented.
    Źródło:
    Sylwan; 2008, 152, 04; 46-57
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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