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    Wyświetlanie 1-7 z 7
    Tytuł:
    Deadwood in the oak forests of the Left Bank Forest-steppe of Ukraine
    Autorzy:
    Yarotskiy, Volodymyr Yu.
    Pasternak, Volodymyr P.
    Nazarenko, Vitalii V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041948.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    coarse woody debris
    dead trees (snags)
    dead logs
    growing stock
    stand
    Opis:
    Deadwood is an important component of forest ecosystems, and difference in the deadwood carbon stock depends on many variables including forest management. The aim of our study was to determine the patterns of formation of deadwood stocks in oak (Quercus robur L.) forests in the Left Bank Forest-steppe of Ukraine. As an outcome of the research, the data on deadwood parameters were obtained. The growth characteristics and coarse woody debris (CWD) characteristics were measured on intensive monitoring and inventory plots. Assessment of morphometric parameters of the CWD in oak stands was carried out by measuring diameters at top and bottom cut and length; to determine the carbon content, deadwood density was used. The distribution of deadwood by tree species, sizes and stages of decomposition was defined. The stock of dead trees (snags) in oak forest is 15.2 m3/ha and that of logs is 21.5 m3/ha. The carbon accumulation in oak forest stands in the Left Bank Forest-steppe of Ukraine was 3.4 and 4.5 t C/ha in dead trees and logs, respectively. The dynamics of deadwood stocks according to the results of repeated observations was given.
    Źródło:
    Folia Forestalia Polonica. Series A . Forestry; 2019, 61, 4; 247-254
    0071-6677
    Pojawia się w:
    Folia Forestalia Polonica. Series A . Forestry
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Problematyka pomiarów oraz określania miąższości martwego drewna na kołowych powierzchniach próbnych
    Measurement and calculation of the volume of deadwood on circular sampling plots
    Autorzy:
    Bujoczek, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/989747.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    powierzchnie probne kolowe
    drewno martwe
    miazszosc drewna
    pomiary drewna
    metody pomiarow
    coarse woody debris
    snags
    shape
    decomposition
    field methods
    volume determination
    Opis:
    The paper analyzes two methods of deadwood (DW) measurements on circular sampling plots. In the first method, the volume of DW is measured within the circumference of the sampling plot irrespective of the fact whether the live tree was located inside or outside the plot. The other method requires the measurement of only that DW, which can be attributed to trees that originally grew within the sampling plot. This requires identification all debris fragments originating from those trees both within and outside the sampling plot. Additionally, the paper compares the results obtained using Smalin's and Huber's formulas and discusses the influence of decomposition stage on the calculated volume of lying deadwood. Measurements were conducted in two stands. In each of them 20 circular sampling plots (4 or 5 ares) were established. In both stands, the second investigated measurement method led to a lower mean DW volume (by 6.3% and 27.2%). In practice, it was very difficult to identify DW from the outside of the sampling plots as high trees growing close to the plot had their fragments lying up to several dozen meters away. If a tree was very fragmented upon falling, it was difficult to find all the relevant pieces of DW and determine whether they derived from the sampling plot or not. The volume of lying DW calculated according to Smalin's formula was by 5% higher. In case of 7.7% of the 194 inventoried fragments of lying DW the transverse cross−section changed from circular to misshapen. The application of formulas accounting for decomposition decreased the calculated volume of lying DW by 5.1%. Taking into consideration the time−effectiveness and accuracy of measurements, it has been found that for most stands the best method is to measure the ends of DW pieces, calculating the length of segments from polar coordinates (using the measurement principles presented in the figures). In addition, especially in measuring large trees, one should take into account changes in shape attributable to decomposition, which may influence the calculation of DW volume. It is recommended that all DW fragments within a circular sampling plot should be measured irrespective of whether the tree from which they derive grew inside or outside the plot.
    Źródło:
    Sylwan; 2015, 159, 10; 795-803
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena zasobów martwego drewna w lasach gospodarczych z względnieniem typów siedliskowych lasu oraz bonitacji gatunku panującego
    Effect of site conditions and site index for the dominant tree species on the amount of deadwood in managed forests
    Autorzy:
    Bujoczek, L.
    Zięba, S.
    Banaś, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/989223.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    lasy gospodarcze
    drewno martwe
    miazszosc drewna
    warunki siedliskowe
    typy siedliskowe lasu
    bonitacja siedliska
    coarse woody debris
    snag
    volume
    site productivity
    fertility
    moisture
    Opis:
    The work studied the effects of site conditions on the amount of deadwood (DW) in managed forests in south−western Poland. Measurements included standing dead trees, snags with a diameter at breast height of at least 7 cm, and lying deadwood (logs, branches, uprooted trees, etc.) with a diameter at the thicker end of at least 10 cm. The study excluded snags and deadwood pieces with a diameter of less than 7 cm as well as stumps. Site conditions are presented according to the Polish site classification system taking into account both site fertility and water abundance. With respect of the fertility gradient, sites are classified as dystrophic, oligotrophic, mesotrophic, and eutrophic. In terms of water abundance, there are two types of sites: mesic (low or very low contribution of groundwater, rainwater, and floodwater, with an approximate springtime water table depth of more than 1.8 m) and moist (moderate or considerable contribution of groundwater, rainwater, and floodwater, with an approximate springtime water table depth of 0.5−1.8 m). We analyzed data from 2522 sampling plots with area ranging from 50 to 500 m² and depending on forest stand age. The plots were established in forest stands older than 21 years old. The predominant tree species in the study area were Pinus sylvestris, Quercus robur, Quercus petraea, Betula pendula, Fagus sylvatica, Alnus glutinosa, Fraxinus excelsior and Picea abies. In a separate analysis of data from 233 sampling plots, we studied the relationship between DW volume and the site index evaluated using a five−level classification (level I denotes sites with the highest productive capacity). Forest stands aged >80 years with the dominance of Pinus sylvestris were studied. The study showed a significant influence of site conditions on the DW volume in managed forests. Forest stands exhibiting better site conditions not only provided more timber, but also contributed with a greater amount of deadwood to the ecosystem. Forest stands with a site index of I contained as much as 4.9 m³ of DW/ha, while stands with a site index of III only 2.4 m³ of DW/ha. In terms of the 8 studied site types, it was also found that the average volume of DW increased with site fertility. The lowest volume of DW occurred on very nutrient−poor and mesic sites (0.6 m³/ha). In contrast, nutrient−rich and moist sites contained 15 times as much DW (9.5 m³/ha). Of paramount importance was water abundance. The volume of DW on moist sites was on average by 2.2−4.5 m³/ha higher than on mesicsites with the same fertility.
    Źródło:
    Sylwan; 2016, 160, 04; 320-327
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inwentaryzacja martwego drewna statystyczną metodą reprezentacyjną z zastosowaniem warstw gatunkowo-wiekowych
    Inventory of deadwood by the means of a statistical representative sampling method using species-age layers
    Autorzy:
    Bujoczek, L.
    Bujoczek, M.
    Banaś, J.
    Zięba, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/989002.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drewno martwe
    miazszosc drewna
    zasoby drzewne
    szacowanie zasobow
    metody statystyczne
    typy siedliskowe lasu
    gatunki panujace
    wiek drzewostanu
    coarse woody debris
    snags
    measurements
    accuracy
    Opis:
    According to the current forest management manual, deadwood volume should be evaluated on 10% of sampling plots, located in different species−age layers, which are used for determining stand volume in a given forest unit. Sampling plot size differs depending on tree stand age and ranges from 0.005 to 0.05 ha. The results are reported for the entire forest district and by forest site type. The objective of the study was to analyze the accuracy of deadwood volume estimations in the light of the guidelines stipulated in the forest management manual and to find the ways to improve the obtained results. Deadwood volume was measured on 2752 sample plots used to determine stand volume and the mean value calculated on that basis was 5.4 m³/ha. Subsequently, 30 random draws of sampling plots were performed. Estimates based on randomly selected pools consisting of 10% of sampling plots ranged from 3.5 to 8.6 m³/ha. Subsequently, another 10% of sampling plots were randomly drawn and added to the previous ones. The results for 20% of sampling plots were 4.5−7.0 m³/ha, for 30% – 4.3−6.4 m³/ha, for 40% – 4.6−6.4 m³/ha and for 50% – 4.7−6.0 m³/ha. In the next step, 225 sampling plots located in reserves and special zones around the nests of protected species were discarded. The mean volume of deadwood computed for the managed forest areas alone (2527 sample plots) was 4.7 m³/ha. The random drawing procedure was repeated to give the following results: 3.6−6.8 m³/ha for 10% of sampling plots; 3.8−5.8 m³/ha for 20%; 3.9−5.3 m³/ha for 30%; 4.2−5.3 m³/ha for 40%; and 4.2−5.1 m³/ha for 50% of sampling plots. The categorization of the randomly selected sampling plots by forest site type in most cases yielded results significantly differed from the values computed based on all sampling plots. It was found that estimates based on 10% of sampling plots may diverge considerably from true values due to the uneven distribution of deadwood. In particular, managed and unmanaged forest areas should not be combined due to the high differences in the volume of deadwood between them. If a relatively low number of sampling plots is used, it seems advisable to report results only for the forest division as a whole, without a breakdown into site types. Satisfactory estimates for the different forest sites types would require much more work. The use of a greater number of sampling plots than specified in the forest management manual seems to be a fundamental prerequisite for improving the accuracy of deadwood volume estimates.
    Źródło:
    Sylwan; 2017, 161, 02; 114-123
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dekompozycja obumarłych drzew w ekosystemach leśnych ze szczególnym uwzględnieniem świerka, buka i jodły
    Decomposition of coarse woody debris in forest ecosystems with particular reference to spruce, beech and fir
    Autorzy:
    Bujoczek, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/994583.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    ekologia lasu
    ekosystemy lesne
    drzewa obumarle
    jodla
    Abies
    buk
    Fagus
    swierk
    Picea
    drewno jodlowe
    drewno bukowe
    drewno swierkowe
    dekompozycja
    decomposition
    fragmentation
    decay
    coarse woody debris
    fir
    spruce
    beech
    Opis:
    Dead trees are an important component of forest ecosystems, being a major reservoir of organic carbon, as well as a habitat for many species belonging to different systematic groups. The paper presents a review of the literature on wood decomposition and the factors that play an important role in this process, including its biological and physicochemical aspects. It provides recent knowledge on the rate of decomposition for the main forest tree species of Carpathian Mountains such as Norway spruce, European beech and European silver fir.
    Źródło:
    Sylwan; 2012, 156, 03; 208-217
    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:
    Bilans martwego drewna w rezerwacie "Polesie Konstantynowskie"
    Balance of dead wood in the 'Polesie Konstantynowskie' nature reserve (central Poland)
    Autorzy:
    Pawicka, K.
    Woziwoda, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/973946.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    rezerwaty przyrody
    rezerwat Polesie Konstantynowskie
    drewno martwe
    drewno olszowe
    olsza czarna
    Alnus glutinosa
    drewno brzozowe
    brzoza brodawkowata
    Betula pendula
    drewno grabowe
    grab pospolity
    Carpinus betulus
    drewno jesionowe
    Fraxinus excelsior
    leśnictwo
    stopień rozkładu drewna
    jesion wyniosły
    coarse woody debris
    standing dead trees
    decay class
    urban forestry
    Opis:
    Dead wood in the city parks is removed for safety and aesthetic reasons. ‘Polesie Konstantynowskie’ nature reserve (9.8 ha) located in the western part of Łódź is an exception. In this reserve dead wood is left for natural decomposition. So far in this reserve research was conducted on the vascular flora and stand structure only, but the amount of wood was not measured. The aim of this study was to assess the volume of coarse woody material of various types (coarse woody debris, snags), species, size, (dbh and height) and decay classes. The study was carried out in 2010. The volume of coarse woody debris was estimated with a method proposed by Van Wagner [1968]. The criterion of division into five decomposition classes follows Maser et al. [1979].
    Źródło:
    Sylwan; 2011, 155, 12; 851-858
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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