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Wyświetlanie 1-9 z 9
Tytuł:
Zmiany bogactwa gatunkowego runa borów sosnowych na pasach wydmowych Kampinoskiego Parku Narodowego na początku XXI wieku
Changes of the herb layer species richness within Scots pine forest of the dune belts in the Kampinos National Park (central Poland) at the beginning of XXI century
Autorzy:
Zaniewski, P.T.
Solon, J.
Ferchmin, M.
Siedlecki, L.
Powiązania:
https://bibliotekanauki.pl/articles/979033.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
peucedano−pinetum
querco−pinetum
permanent plots
semi−permanent plots
old−growth pine forest
fluctuation
species richness decrease
Opis:
Scots pine forest are of the main economic importance to the forest management in lowland Europe. Large areas of spontaneous pine forest, including old−growths, are located on two vast dune belts of the Kampinos National Park (central Poland). These forests grow on oligotrophic sandy soils with deep groundwater level. This makes the area unique to study long−term changes in this type of pine forest communities. The aim of the work was to assess the changes in the species composition and richness of undergrowth of Scots pine forests at the beginning of the XXI century. The study was conducted on 10 permanent and 53 semi−permanent plots located within stands of Peucedano−Pinetum and Querco−Pinetum associations on both dune belts of Kampinos National Park. The fieldworks were performed in 2001 and 2002, and repeated in 2015 and 2018. Based on Ward’s cluster analysis we described five local forms of plant communities. Seven species groups were distinguished and changes in their richness assessed using one sample Wilcoxon test. Each species group included species characteristic and/or differentiating for a given set of syntaxonomical units. The results confirmed the hypothesis of gradual decrease of the total species richness. The median of species richness change was –0.308 species per year and was statistically significant. The changes were bigger within the local forms of the Querco−Pinetum association in comparison to Peucedano−Pinetum. The decrease was connected especially with dry grassland and heathland species (characteristic for syntaxons of Koelerio−Corynephoretea and Nardo−Callunetea classes) as well as with coniferous forest generalist species (characteristic for syntaxons of Vaccinio−Piceetea and Cladonio−Vaccinietalia). The results suggest that the two main processes shaping the species composition at the beginning of XXI century within pine forest located on the dune belts of Kampinos National Park may be identified as (i) fluctuation, and (ii) simplification, manifested by species richness decrease. This is probably connected with forest regeneration after past human use and disturbance.
Źródło:
Sylwan; 2020, 164, 04; 331-342
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pomiar zasobów leśnych z wykorzystaniem stałych koncentrycznych powierzchni próbnych - problemy i próby rozwiązań
Measurement of forest resources using permanent concentric sample plots - problems and attempts at their solving
Autorzy:
Miścicki, S.
Nowicka, E.
Powiązania:
https://bibliotekanauki.pl/articles/1015716.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
powierzchnie probne brzegowe
powierzchnie probne koncentryczne
lasy
obliczenia
stale powierzchnie obserwacyjne
zasoby lesne
lesnictwo
permanent sample plots
concentric plots
edge plots
successive measurements
ingrowth
overgrowth
current periodic volume increment
Opis:
The conditions of using concentric sample plots in a successive inventory were researched. New definitions of ‘ingrowth' and ‘overgrowth' were introduced. As there is a possibility that sample plots could be located at stand edges, a new method POW_K of converting data from concentric plots was developed. The calculation results using this method were compared with the results obtained by the traditional method WSP. Two variants of obtaining inventory results for the whole forest district were taken into consideration – with and without stratification. Due to the value of mean errors of assessment of significant characteristics – volume and current periodic volume increment – the WSP method turned to be better – particularly in the variant with stratification. However, this method cannot be applied for utilizing the results of measurements of edge plots.
Źródło:
Sylwan; 2007, 151, 08; 15-26
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rtęć w glebach poletek łowieckich oraz otaczających je lasów
Mercury in the soils of the hunting plots and the surrounding forests
Autorzy:
Kobierski, M.
Malczyk, P.
Powiązania:
https://bibliotekanauki.pl/articles/989573.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lowiectwo
poletka lowieckie
lasy
gleby lesne
zanieczyszczenia gleb
rtec
zawartosc rteci
biokoncentracja
mniszek lekarski
mercury
arenosols
hunting plots
dandelion
Opis:
Some trace elements, because of their high capacity for bioaccumulation, can pose a threat to the adequate development and growth of plants, animals and humans, which concerns mostly mercury (Hg) and its compounds that characterize by strong toxic properties. The aim of the research was to compare the Hg content in the Arenosols of arable fields (food plots), referred to as hunting plots, as well as in the soils of neighbouring forests. Research was performed in the Szubin Forest District (northern Poland). To assess the effect of mercury on the environment, we used dandelion (Taraxacum officinale) as a bioindicator. The samples were collected from the soil profiles from 8 hunting plots and 8 woodland areas in close vicinity of these plots. Mercury was assayed with the atomic absorption spectrometry applying the AMA 254 analyser. The mercury contamination factor (CF) and the potential ecological risk index (Er) values were determined with the local Hg value of the geochemical background (5.7 µg/kg). Assuming such very low Hg concentration as the reference value for the parent material of the soils, the mean CF value points to a considerable anthropogenic mercury accumulation in the surface horizons. The soils of hunting plots as well as forest soils are not contaminated with mercury. The total Hg content falls within the natural content level and reaches in the mineral horizons – from 3.5 to 20.7 µg/kg, while in the litter layer – from 60.3 to 166.7 µg/kg. The mercury bioconcentration factor (BCF) and translocation factor (TF) values point to a clear accumulation in the aboveground parts of dandelion. We found a significantly positive correlation between the content of mercury and organic carbon as well as the clay fraction. The mercury content in the soils under study varies and it depends on the soil origin and the effect of anthropogenic factors. In the forest soils of the Pomorze and Kujawy Province the mercury content of the geochemical background is relatively low. The areas of the Szubin Forest District do not undergo an excessive anthropopressure and sources of Hg depositions in soil surfaces can be the deposition of mercury from air.
Źródło:
Sylwan; 2016, 160, 05; 433-440
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Drzewostanowa metoda inwentaryzacji i kontroli lasów różnowiekowych
Stand-level inventory and control method for uneven-aged forests
Autorzy:
Banaś, J.
Powiązania:
https://bibliotekanauki.pl/articles/1022776.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
drzewostany roznowiekowe
drzewostany
metoda drzewostanowa
metody badan
monitoring
lesnictwo
inwentaryzacja lasu
uneven−aged forest
control sample plots
statistical−mathematical inventory system
Opis:
The paper presents a stand−level inventory and control method which can be useful in the inventory of uneven−aged forests. The method describes the variation in stem diameter and species structure in a specified stand and allows to define the intensity of processes: loss, ingrowth and increment and to analyse relationships between them.
Źródło:
Sylwan; 2005, 149, 11; 18-24
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dokładność określania wybranych parametrów rozkładów pierśnic drzew w drzewostanach sosnowych za pomocą naziemnego skanowania laserowego
Accuracy of the selected tree diameter distributions parameters assessed using terrestrial laser scanning in Scots pine stands
Autorzy:
Zasada, M.
Sterenczak, K.
Powiązania:
https://bibliotekanauki.pl/articles/994333.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
dendrometria
zasoby drzewne
inwentaryzacja
drzewostany sosnowe
powierzchnie probne kolowe
rozklad piersnic
dokladnosc
skanowanie laserowe
forest inventory
circular sample plots
quadratic mean diameter
percentile
skewness
kurtosis
Opis:
When using such methods as terrestrial laser scanning (TLS), one of the major factors influencing the accuracy of stand characteristics determination is the visibility of trees on a sample plot, which is often obscured by the shadow effect caused by trees located closer to the plot center. Because of this, the percentage of the identified trees and basal area depends on the distance from the plot center: the accuracy of stocking determination decreases as the plot radius increases. The values of such stand characteristics as average breast height diameter, standard deviation of tree diameters and percentiles of the tree diameters' distributions assessed based on all trees and the visible trees only are not significantly different from each other for circular sample plots with 20 m radius. Skewness and kurtosis are not significantly different in plots with radius of 5 and 10 meters. For the 15 m plot radius the difference was significant for about 15% of the analyzed plots. The obtained results correspond with previous findings that report that on the circular sample plots with radius up to 15 m the errors for the number of trees and basal area are relatively small and can be accepted in the practical inventory. The results support the circular sample plots size optimization, including measurements performed using a point cloud.
Źródło:
Sylwan; 2013, 157, 12; 883-891
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aktualizacja zapasu drzewostanów na podstawie danych z SILP i stałych kontrolnych powierzchni próbnych
Updating of stands timber volume on the basis of the data from State Forest IT system [SILP] and permanent control sample plots
Autorzy:
Miścicki, S.
Nowicka, E.
Powiązania:
https://bibliotekanauki.pl/articles/1013391.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
przyrost miazszosci
aktualizacja
lesnictwo
powierzchnie probne
uzytkowanie rebne
System Informatyczny Lasow Panstwowych
zapas drzewostanu
silp
permanent sample plots
growing stock
update
utilization
current periodical volume increment
bayesian estimation
Opis:
The results of measurements of permanent control sample plots (skpp) were used to update the growing stock of individual stands in the State Forests IT System (SILP). The calculation was based on Bayesian estimation. Several update methods were used differing in the principles of estimating the initial growing stock. The growing stock update results for the whole forest and individual age classes were similar for all the applied methods. The volume of the estimated increment and the recorded cuts in SILP was lower compared to the measurement results in skpp. In addition to the periodical correction of the SILP data, the application of skpp would enable reduction in the intervals between the growing stock inventories (to 20−30 years) performed on the basis of a relatively large number of temporary sample plots.
Źródło:
Sylwan; 2008, 152, 11; 26-39
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Jakość hodowlana buka zwyczajnego (Fagus sylvatica L.) po 20 latach wzrostu na powierzchni proweniencyjnej w Nadleśnictwie Brzeziny
Silvicultural quality of common beeches (Fagus sylvatica L.) after 20 years of growth on a provenance plot in Brzeziny Forest District
Autorzy:
Szeligowski, H.
Buraczyk, W.
Drozdowski, S.
Andrzejczyk, T.
Stępniarek, M.
Dzwonkowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/980226.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
hodowla lasu
drzewa lesne
buk zwyczajny
Fagus sylvatica
jakosc hodowlana
wzrost roslin
pokroj
doswiadczenia proweniencyjne
Nadlesnictwo Brzeziny
provenance plots
growth traits of trees
tree habit
silvicultural quality
Opis:
Paper presents an analysis of phenotypical variation and an evaluation of silvicultural quality of progeny from 27 beech stands around Poland that grow on the provenance plot in the Brzeziny Forest District (51.791997°N, 19.813841°E). The trial commenced in spring 1996, on the basis of 2−year−old saplings with covered root systems. A randomised block method with 3 replications was applied, with subsequent measurements and analyses carried out in 2015, following 20 years of growth. The considered features included height, breast−height diameter, crown habit, trunk curvature and height of branching. Single−factor analysis of variance and Tukey’s HSD test were applied to determine the significance of differences among provenances. The largest mean height was attained by beeches originating from Gdańsk, Szczecinek and Bierzwnik. The least−tall beeches were in turn those whose origins were in Tomaszów, Łagów and Grodzisk. The greatest intra−population variation in height characterised the beeches from Gryfino and Krucz, while the most limited variation was noted for Gdańsk population. The beeches of greatest girth were again those deriving from Gdańsk, Bierzwnik and Szczecinek populations, as well as the one from Kwidzyn 15. The lowest values for diameter at breast height were again noted for the Grodzisk, Tomaszów and Łagów provenances. Marked intra−population variation in this feature characterised trees from the Gryfino, Bieszczady National Park (42), Zdrojów and Krucz provenances. The populations also differered in relation to analysed more−qualitative features. The group of populations prized most in terms of their overall silvicultural quality included Gryfino, Grodzisk, Zdrojów, Bieszczady National Park, Bierzwnik and Szczecinek provenances. In contrast, only low quality was manifested by beeches from Tomaszów, Rymanów, Wejherowo, Młynary, Golub− −Dobrzyń and Kwidzyn provenances. In general, populations originating from the north (especially Pomerania) achieved better growth and a more favourable quality evaluation than those from the south, and sites located near the range limits of the species (fig. 7). The obtained results show that northern Poland boasts the most plastic populations of beech. Equally, it was not possible to establish that populations of local origin were superior in terms of growth to those originating in more far−flung parts of Poland. Furthermore, assessments of different populations in terms of their growth and quality features often proved highly disparate.
Źródło:
Sylwan; 2019, 163, 07; 590-600
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wstępne wyniki wielkoobszarowej inwentaryzacji stanu lasu – podstawy banku danych o zasobach leśnych i stanie lasów
Preliminary results of a large-scale forest inventory as the basis for establishing a bank of data on forest resources and forest condition
Autorzy:
Zajączkowski, S.
Powiązania:
https://bibliotekanauki.pl/articles/1012431.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
zasoby drzewne
stan zdrowotny lasu
lasy
stale powierzchnie obserwacyjne
zasoby lesne
lesnictwo
inwentaryzacja wielkopowierzchniowa
large−scale forest inventory
bank of data on forest resources and forest condition
measurements and
observations on sample plots
preliminary results
Opis:
The paper presents general assumptions for and preliminary results (after two years of measurements and observations) of the large−scale forest inventory performed in the country for all ownership categories since 2005. The results of the large−scale forest inventory in Poland should be the basis for a bank of data on forest resources and forest condition that will be an important module in a planning and forecasting system in Polish forestry.
Źródło:
Sylwan; 2008, 152, 01; 64-71
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena wpływu roślinożernych ssaków kopytnych na odnowienie lasu w Białowieskim Parku Narodowym
The impact of herbivorous ungulates on forest regeneration in the Białowieża National Park
Autorzy:
Kweczlich, I.
Miścicki, S.
Powiązania:
https://bibliotekanauki.pl/articles/1023208.pdf
Data publikacji:
2004
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
szkody w lesie
oddzialywanie na srodowisko
odnowienia lasu
metody badan
Alces alces
lesnictwo
Bialowieski Park Narodowy
jelen europejski
ssaki kopytne
Bison bonasus
los
zubr
Capreolus capreolus
Cervus elaphus
sarna
ungulate herbivores
forest regeneration
damage
development
comparative sample plots
białowieża
national park
strict protection
Opis:
Measurement results carried out on 30 comparative sample plots in 2000−2002 demonstrated negative effect of ungulate herbivores on the development of forest regeneration in the strictly protected area the Białowieża National Park. The tree height index permitted to state that cervidas and bisons were the damage−causing agents. Other indices (density, tree height sum and species diversity) were insufficient to assess the effect of wild boars.
Źródło:
Sylwan; 2004, 148, 06; 18-29
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-9 z 9

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