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    Wyświetlanie 1-7 z 7
    Tytuł:
    Dynamika naturalnego wydzielania się drzew w drzewostanach sosnowych
    Dynamics of natural supression of trees in pine stands
    Autorzy:
    Beker, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1022659.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    drzewostany sosnowe
    lesnictwo
    wydzielanie sie drzew
    pine stands
    pinus sylvestris l.
    standing dead trees
    dynamics
    thinning grade
    Opis:
    This paper presents research results on the dynamics of natural suppression of trees in pine stands. Measurement data come from 14 permanent research plots, encompassing proportionally the tree stands of 2nd to 5th age classes.
    Źródło:
    Sylwan; 2005, 149, 12; 45-52
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zagęszczenie i dynamika procesu wydzielania drzew w młodocianych drzewostanach brzozowych na gruntach porolnych
    Stand density and self-thinning dynamics in young birch stands on post-agricultural lands
    Autorzy:
    Socha, J.
    Zasada, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/991052.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    grunty porolne
    uprawy lesne
    drzewostany brzozowe
    drzewostany mlode
    zageszczenie drzew
    wydzielanie sie drzew
    self−thinning
    silver birch
    abandoned farmlands
    stochastic frontier function
    quantile regression
    Opis:
    The study describes allometric relationships between stand density and tree dimensions in birch stands on post−agricultural lands. The research material consisted of measurements carried out on 120 sample plots located in birch stands on post−agricultural lands of Central Poland. The investigated relationship was analyzed using ordinary least squares (OLS), dynamical formulation of allometric function (DFA), stochastic frontier production function (SFF) as well as quantile regression (QR) methods. Similar effects of modeling maximum density were obtained as a result of applying FFP and QR methods with 0.9 quantile. SFF was found to be the most adequate method for modeling maximum density.
    Źródło:
    Sylwan; 2014, 158, 05; 340-351
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tempo naturalnego wydzielania drzew w drzewostanach sosnowych wzrastajacych w roznych strefach przemyslowego zagrozenia
    Autorzy:
    Orzel, S.
    Socha, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/819879.pdf
    Data publikacji:
    2000
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    drzewostany sosnowe
    zanieczyszczenia przemyslowe
    tereny przemyslowe
    Tarnobrzeski Kombinat Siarkowy
    lesnictwo
    wydzielanie sie drzew
    Huta Cynku i Olowiu Miasteczko Slaskie
    Legnicko-Glogowski Okreg Miedziowy
    Źródło:
    Sylwan; 2000, 144, 09; 77-87
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Przewidywane oddziaływanie zmian klimatu na ekosystemy leśne oraz ich konsekwencje w urządzaniu lasu
    Expected impact of climate change on forest ecosystems and its consequences in forest management planning
    Autorzy:
    Borecki, T.
    Orzechowski, M.
    Stępień, E.
    Wójcik, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/987172.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    ekosystemy lesne
    urzadzanie lasu
    czynniki klimatyczne
    oddzialywanie na las
    zmiany klimatyczne
    prognozowanie zagrozen
    wydzielanie sie drzew
    plan ciec
    climate change
    forest ecosystems response
    forest management planning
    Opis:
    The paper presents the assessment of possible impact of climate change on forest ecosystems in Poland and its consequences in the forest management planning. Scenarios of climate change in the twenty first century do not allow unambiguous determination of the rate and direction of these changes. However, it is believed that climate change could have negative economic con− sequences, which directly or indirectly will affect the deterioration of the environment. Analysis of the possible forms of the impact of climate change on forest ecosystems is particularly relevant in terms of growth conditions. The most noticeable consequences of the changes will concern the threat to the stability of forest stands resulting from the increase in the intensity of trees dieback caused by different factors. The phenomenon results, among others, from: the occurrence of new threats from biotic factors, including caused by secondary pests and the occurrence of alien species of flora and fauna, the severity of the impact of abiotic factors and the deterioration of health (especially of conifers). The increase in the intensity of the evolution of trees is directly related to the size of the cuts contingent and will lead to a blurring of the boundary between thinning and health−cutting. It is expected that the planned size of the cuts will be implemented mainly in the thinning and accidental cuts. This requires the modification of the perception of the rela− tionship of each category cuts. We propose the order and urgency in the planning of forest use. May be supposed that the role of the clearcutting system will be limited, with the exception of some forest complexes of predominantly productive functions, dominated by poor coniferous habitats. It is recommended to use the natural regeneration in the forest management. Lack of clear boundary between thinning and final cutting will require flexibility in the accounting for the total size of cuts. The consequences of climate change will probably occur in the long term perspective. It can therefore be assumed that reasonably forest management can help to reduce their negative effects. This requires pre−emptive decisions in forest management planning and verification for silviculture, production and protection targets, and their consistent implemen− tation.
    Źródło:
    Sylwan; 2017, 161, 07; 531-538
    0039-7660
    Pojawia się w:
    Sylwan
    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
    Tytuł:
    Wpływ jakości siedliska na dynamikę wydzielania brzozy na gruntach porolnych
    Effect of site quality on self-thinning dynamics in silver birch stands on abandoned farmlands
    Autorzy:
    Bijak, S.
    Bronisz, K.
    Szydłowska, P.
    Wojtan, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/991005.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    grunty porolne
    zalesianie
    odnowienia lasu
    drzewostany brzozowe
    drzewostany mlode
    brzoza brodawkowata
    Betula pendula
    wydzielanie sie drzew
    czynniki siedliska
    bonitacja siedliska
    stand density
    site index
    silver birch
    afforestation
    central poland
    Opis:
    Paper discusses the influence of site quality on self−thinning process in silver birch stands growing on abandoned farmlands in Mazowieckie region (central Poland). Number of trees in a stand decreases with increasing age. The better the site (the higher site index value), the higher number of trees can be observed. However at the age of 10 difference between sites of various quality (site index) become insignificant. There is no need to include site index into the self−thinning models for young silver birch stands.
    Źródło:
    Sylwan; 2014, 158, 06; 423-430
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ wybranych elementów charakterystyki drzewostanów na intensywność występowania kornika drukarza Ips typographus (L.) w Beskidzie Żywieckim
    Impact of selected stand characteristics on the occurrence of the bark beetle Ips typographus (L.) in the Beskid Zywiecki Mountains
    Autorzy:
    Grodzki, W.
    Starzyk, J.R.
    Kosibowicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1317562.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    Beskid Zywiecki
    siedliska lesne
    drzewostany
    miazszosc drzew
    wydzielanie sie posuszu
    szkodniki roslin
    kornik drukarz
    Ips typographus
    wystepowanie
    insect outbreak
    site
    stand characteristics
    spatial analysis
    Picea abies
    Opis:
    Recently, Norway spruce stands in Beskid ¯ywiecki (Western Carpathians) have been plagued by bark beetle outbreak affecting an extensive area over a large range of altitudes. Georeferenced data (2356 records) from 2009–2011 of the volume of felled spruces showing insect infestation in forest sub-compartments were analysed with respect to selected site and stand characteristics. The infestation intensity varied between individual parts of the examined area. Spruce mortality, recorded evenly across all slope expositions, was higher in the zones 800 m – 1000 m and above 1000 m than in the zone below 800 m. The infestation intensity increased slightly with spruce representation in the stands and was higher in stands older than 80 years. There was no clear correlation between spruce mortality and site quality. However, in areas with more diverse and fertile sites mortality was lower. In overall, the results obtained in this study are in line with previous knowledge on the subject, but patterns describing bark beetle preferences in infested areas appear to be less pronounced than those found in earlier publications. Risk assessment and current planning of forest protection measures in stands affected by bark beetle outbreaks should be based on the here described characteristics of spruce susceptibility to insect infection.
    Źródło:
    Leśne Prace Badawcze; 2014, 75, 2; 159-169
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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