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    Wyświetlanie 1-6 z 6
    Tytuł:
    Wzrost różnorodności gatunkowej chrobotków jako efekt rębni zupełnej na ubogich siedliskach borowych
    Increase of Cladonia species diversity as a consequence of clear-cutting in nutrient-poor forest sites
    Autorzy:
    Stefańska-Krzaczek, E.
    Faltynowicz, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/994072.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    siedliska borowe
    siedliska oligotroficzne
    rebnie zupelne
    drzewostany sosnowe
    chrobotek
    Cladonia
    wystepowanie
    roznorodnosc gatunkowa
    scots pine forest
    managed forest
    ground lichens
    stand age classes
    Opis:
    Clear−cutting impacts site conditions seriously. However, in nutrient−poor sites the effects of stand removal can be minor than in nutrient−rich sites. The aim of this work was to assess whether the clear−cut can improve species diversity of ground Cladonia species, which decline has been observed in forest communities. In stands of different age classes (≤10, 11−20, 21−40, 41−60, 61−80, ≥81 years) in the Przymuszewo Forest District (northern Poland) ground Cladonia species and their cover were recorded on research plots (10×15 m). A total of 24 species were identified in the study area. There were more Cladonia species and they were more abundant in young stands (<20 years old) than in stands older than 60 years. Nine species are significantly more frequent and demonstrated high fidelity in young stands and only one was characteristic for old stands. Composition of Cladonia species depended primarily on stand age and subsequently on canopy or bryophyte cover. In nutrient−poor sites clear−cutting is favourable for Cladonia species diversity.
    Źródło:
    Sylwan; 2013, 157, 12; 929-936
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Potrzeby przebudowy drzewostanów w Lasach Państwowych
    The needs related to the reconstruction of stands in the State Forests
    Autorzy:
    Czuba, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1018668.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    drzewostany gospodarcze
    przebudowa drzewostanow
    Panstwowe Gospodarstwo Lesne Lasy Panstwowe
    lesnictwo
    forest management plan
    adjustment of stands to site conditions
    managed forest type
    complete stand
    conversion
    partial stand conversion
    Opis:
    The paper presents a division of the State Forests stands by the degree of adjustment of species composition of stands to site conditions. An assumption was made that the stands whose species composition is not adjusted to the occupied biotope should be urgently rebuilt, especially those featuring low stability.
    Źródło:
    Sylwan; 2006, 150, 12; 33-38
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zespoły chrząszczy ściółkowych w gospodarczych i chronionych borach sosnowych - efekt 15 lat ochrony rezerwatowej
    Coleoptera assemblages inhabiting managed and preserved pine forests - the effect of fifteen years of reserve conservation
    Autorzy:
    Tamutis, V.
    Skłodowski, J.W.
    Powiązania:
    https://bibliotekanauki.pl/articles/973525.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    ekologia lasu
    owady
    bor sosnowy
    rezerwaty przyrody
    drzewostany gospodarcze
    leśnictwo
    ściółka leśna
    zgrupowania zwierząt
    chrząszcze
    analiza porównawcza
    biodiversity
    transforming managed forest into reserve
    SIMPER analysis
    Opis:
    The assemblages of Coleoptera have been examined in the managed and reserved mature pine forests of Lithuania since 1997. Beetles have been sampled from the forest litter using sieves. The present study is based on the data of 20 litter samples (10 samples per each stand) taken in the period from October 2013 to February 2014. Each sample was compiled of 5 smaller ones taking all litter (up to mineral layer of the soil) from 0.04 m2 plot. During the study a total 450 adults representing 69 species of beetles was discovered. Both the average number of species and the number of individuals were found to be higher in the samples taken in reserved forest and made 10.7±1.4 and 27.2±4.9, whereas in managed forest they made 9.7±1.1 and 17.8±3.4, but the differences were not statistically significant. The proportions of phytophagous, mecetobionts and saprophagous were also bigger in reserved forest: 9.5±2.0, 7.8±2.2, 3.1±1.0 than those in the managed forest, where these groups consisted of 8.0±1.8, 4.9±1.7 and 2.8±1.6 percent of the total number of individuals in the sample, respectively. The opposite proportions were detected for zoophages, which were more ambiguous in the managed forest and were by 76.0±2.5 higher than those in the reserved forest 72.8±3.2. These differences were not statistically significant. A non−metric multidimensional scale (NMDS) using Bray−Curtis similarity matrix indicated low differences of the Coleoptera assemblages between investigated sites (final stress=0.22). The analysis using RDA showed some differences between Coleoptera assemblages inhabiting reserved forest (R) and managed forest (D), which were correlated with proportions of humified mortmass (+0.88) and biomass of moss (–0.63 and –0.71). The dissimilarity index calculated using the algorithm SIMPER, was quite high (71%), but the obtained results showed a relatively low diversity of beetle assemblages in both forests. It means that the process of transformation of the managed forest into reserve is very slow, most likely due to the fact that restoration of the microhabitats is particularly slow. Low differentiation of Coleoptera assemblages dwelling in litter is associated with low dispersal power of most coleopteran species. Thus, the establishment of new reserves in old growth pine forests can not stimulate fast increase of specific beetle diversity mainly because the regenerative processes of microhabitats seem to be extremely slow. The specific diversity of beetle assemblages was slightly higher in the reserved forests, but it was not confirmed statistically. In comparison with the managed old growth pine forest the period of fifteen years of reservation of old growth pine forest has only a very low effect on specific diversity and ecological specialization of the beetles.
    Źródło:
    Sylwan; 2015, 159, 02; 142-150
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zasoby oraz zróżnicowanie martwego drewna w uroczysku Wapienny Las w Nadleśnictwie Polanów
    Quantity and diversity of deadwood in the Wapienny Las forest
    Autorzy:
    Bujoczek, L.
    Bujoczek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/989321.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Nadlesnictwo Polanow
    drzewostany
    uroczysko Wapienny Las
    drewno martwe
    ilosc drewna martwego
    miazszosc drewna
    stopien rozkladu drewna
    coarse woody debris
    snag
    volume
    decay stage
    size classes
    managed forest
    biodiversity
    Opis:
    Managed forests, which account for the vast majority of woodland areas in Poland, play a major role in preserving biodiversity. The objective of this work was to determine the diversity of woody microsites in a managed forest covering 27 ha of land in Polanów Forest District (north−western Poland). The study was conducted in 2014 on 20 sampling plots with an area of 0.04 ha each. An inventory of deadwood was conducted involving standing dead trees, snags, stumps, and lying deadwood with a diameter of at least 7 cm (in the case of standing deadwood, the diameter was measured at breast height). Deadwood was classified according to a five−level decay scale. The studied forest was found to contain an average of 26.9 m³/ha of deadwood from several tree species. Lying deadwood accounted for 17.3 m³/ha, standing dead trees for 0.9 m³/ha, snags for 4.9 m³/ha, and stumps for 3.8 m³/ha. Deadwood in all decay stages was identified. The most abundant category of deadwood was moderately decomposed wood in decay stage III (31.3%), followed by decay stage II (24.4%), and decay stage IV (19.7%). Deadwood (both standing and lying) was also very diverse in terms of piece diameters. The diameter at breast height of standing dead trees was up to 26 cm, and that of snags up to 50 cm. The thickest pieces of lying deadwood were 48 cm in diameter. However, pieces of less than 35 cm in diameter accounted for 96% of the total volume of lying deadwood. The volume of deadwood in the studied forest stand was very large, much higher than the average for Polish forests in general (5.8 m³/ha). Deadwood was highly varied and contributed to a substantial diversity of organisms that depend on it, as shown by previous research. Wapienny Las is an example of a managed forest that plays an important role in preserving woodland biodiversity.
    Źródło:
    Sylwan; 2016, 160, 06; 482-491
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Las na gruncie porolnym - oczekiwania i rzeczywistość
    Forest on post-agricultural land - expectations and reality
    Autorzy:
    Krawczyk, R.
    Kowalczuk, S.
    Ksepko, M.
    Sierota, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2136482.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    grunty porolne
    zalesianie
    gospodarka lesna
    lasy porolne
    stan zdrowotny lasu
    sukcesja roslin
    odnowienia naturalne
    post-agriculture lands
    afforestation
    managed forests
    forest health
    succession
    natural regeneration
    Opis:
    In Central Europe, deforestation led to a reduction of forest area by almost 80%, compared to the original area, by the beginning of the 20th century. At this point in time, a period of intensive reforestation began in an effort to restore forest areas. This process of reforestation, especially on post-agricultural land, continues to this day. This article examines reforestation and natural regeneration on former farmland and the factors that influence the current state as well as the future growth of the forest. Ancient and contemporary views on the functioning of stands on post-agricultural land created by both, natural and forced succession (i.e. afforestation), are recalled. In Poland, this issue primarily concerns managed state forests, which cover an area of over 2 million hectares. We discuss the differences in the development of these stands resulting from the history of agricultural cultivation, the type of afforestation, the influence of environmental factors as well as biotic threats to their development. Furthermore, the need to change the silviculture-, protection- and endowment-based approach to forest management in stands on post-agricultural land is highlighted.
    Źródło:
    Leśne Prace Badawcze; 2021, 82, 2; 75-86
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Czy naturalne procesy ekologiczne w juwenilnej fazie rozwoju drzewostanu założonego sztucznie różnicują jego strukturę przestrzenną?
    Do natural processes at the juvenile stage of stand development differentiate the spatial structure of trees in artificially established forest stands?
    Autorzy:
    Szmyt, J.
    Korzeniewicz, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1317220.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    ekologia lasu
    drzewostany sosnowe
    drzewostany debowe
    wiezba poczatkowa
    procesy ekologiczne
    wydzielanie sie drzew
    drzewa lesne
    sosna
    dab
    rozmieszczenie drzew w przestrzeni
    piersnice drzew
    wysokosc drzew
    dlugosc korony
    spatial indices
    forest diversity
    self-thinning
    managed forests
    Opis:
    Structural diversity is one of the most interesting phenomena that have been studied by forest ecologists and practitioners. Amongst the different characteristics of forest structure, spatial diversity of trees and their attributes seem to be very important. The more spatially structured a population is, the higher its diversity in terms of size and species richness. Because most forests in Europe are managed and were artificially established, they are subjected to conversion processes turning them into more complex systems. The approach presented here aims at elucidating whether natural processes, such as self-thinning, can cause the self-differentiation of spatial structure in artificially planted stands. Our analyses focused on untended Scots pine and pedunculate oak stands in the juvenile phase of development and were based on spatially explicit structural indices for positioning and size differentiation (diameter, total height and crown length). The obtained results indicate that live trees were dispersed more or less regularly. Unlike the anglebased index, which mostly indicated randomness in tree location, a distance-based index showed clear regularity. We also found that the distribution of tree attributes auto-correlates to tree location as indicated by significantly lower index values compared to values resulting from random reassignment of the examined attributes. This low degree of spatial differentiation is further confirmed by the distribution of indices in differentiation classes. Our results allow us to conclude that, in the case of light demanding species (pine and oak), natural processes do not increase spatial diversity of the stand, although, both species showed a certain degree of deviation in this respect.
    Źródło:
    Leśne Prace Badawcze; 2014, 75, 2; 171-179
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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