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    Wyświetlanie 1-4 z 4
    Tytuł:
    Wybrane cechy gospodarki lesnej w Polsce na tle krajow europejskich
    Selected parameters of forest management in Poland against the background of European forests
    Autorzy:
    Zajac, S.
    Lotz, D.
    Mlynarski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/46160.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    zasoby lesne
    gospodarka lesna
    lasy
    stan zdrowotny lasu
    ochrona lasu
    szkody w lesie
    produkcja drewna
    rynek drzewny
    Polska
    Unia Europejska
    Źródło:
    Leśne Prace Badawcze; 2009, 70, 4; 411-418
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    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:
    Stan zdrowotny a zróżnicowanie genetyczne wybranych drzewostanów świerkowych na terenie RDLP w Krośnie
    Genetic variability and health of Norway spruce stands in the Regional Directorate of the State Forests in Krosno
    Autorzy:
    Gutkowska, J.
    Borys, M.
    Tereba, A.
    Tkaczyk, M.
    Oszako, T.
    Nowakowska, J.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1293265.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    RDLP Krosno
    drzewostany swierkowe
    stan zdrowotny lasu
    drzewa lesne
    swierk pospolity
    Picea abies
    zroznicowanie genetyczne
    markery molekularne
    markery mikrosatelitarne
    DNA mitochondrialny
    Norway spruce
    health state
    SSR markers
    mtDNA
    genetic diversity
    Opis:
    The study was conducted in 2015 in six spruce stands situated in different forest districts administratively belonging to the Regional Directorate of Forests State in Krosno. Each spruce population was represented by 30 trees and assessed in terms of their current health status. Genetic analyses were performed based on shoot samples from each tree using nine nuclear DNA markers and one mitochondrial DNA marker (nad1). The health status of the trees was described according to the classification developed by Szczepkowski and Tarasiuk (2005) and the correlation between health classes and the level of genetic variability was computed with STATISTICA (α = 0.05). Nuclear DNA analyses revealed a low level of genetic variability among spruce populations (only 3% of the total genetic variation (FST = 0.028) and a high variability within populations (97%). The total heterozygosity in all stands (HT) was calculated as 0.646. Based on UPGMA analysis, the most genetically similar populations are spruce stands in the Bieszczady National Park and the Ustrzyki Dolne Forest District, which have the smallest genetic divergence of all populations (DN = 0.0165). Our analysis of the mitochondrial gene nad1 revealed the presence of six different haplotypes “a”, “a1”, “b”, “c”, “d” and “d1”. Comprising 56% of all haplotypes, “a” was the most common showing a predominant impact on spruce migration from the Carpathian area. The analysis based on mitochondrial markers (by Nei) revealed a heterozygosity of 0.525. Based on the observations of disease symptoms, 29% of the trees belong to health class 1,30% to class 2,28% to class 3 and class 4 contains 13% of trees. The comparison between health status and the level of genetic variation in the analyzed stands showed a positive correlation. Spruce stands with better health were also characterized by a greater degree of genetic variability. Since most of the investigated spruce populations shared the mitochondrial haplotype “a”, we have ascertained their Hercynian- Carpathian origin. Only one stand (Cisna) had a high frequency (43.3%) of the Nordic haplotype “c” suggesting that this provenance is derived from the Baltic post-glacial refugium of P. abies in Europe.
    Źródło:
    Leśne Prace Badawcze; 2017, 78, 1
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Opracowanie maski obszarów leśnych w celu monitoringu kondycji zdrowotnej lasów w Polsce na podstawie wieloletnich obserwacji satelitarnych
    Development of forest cover mask to monitor the health condition of forests in Poland using long-term satellite observations
    Autorzy:
    Bartold, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1294000.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    Polska
    lasy
    stan zdrowotny lasu
    monitoring
    obserwacje satelitarne
    program CORINE Land Cover
    pokrycie terenu
    Znormalizowany Wskaznik Wegetacji
    baza CORINE Land Cover 2012
    CORINE Land Cover 2012
    forest condition
    NDVI
    satellite images
    vegetation mapping
    Opis:
    The work presented here aims at developing cover mask for monitoring forest health in Poland using remote sensing data. The main objective was to assess the impact of using the mask on forest condition monitoring combined with vegetation indices obtained from long-term satellite data. In this study, a new mask developed from the CORINE Land Cover 2012 (CLC2012) database is presented and its one-kilometer pixel size matched to low-resolution data derived from SPOT VEGETATION satellite registrations. For vegetation mapping, only pixels with a cover ≥50% of broad-leaved and mixed forests defined by CLC2012 were taken into account. The masked pixels were used to evaluate spatial variability in eight Natural-Forest Regions (NFRs). The largest coverages by masked forests were obtained in Sudetian (65.7%), Carpathian (65.9%) and Baltic (51.3%) regions. For other forest regions the coverage was observed to be around 30–50%. Time-series of the Normalized Difference Vegetation Index (NDVI) comprising SPOT VEGETATION images from 1998 until 2014 were computed and cross-comparison analyses on ≥50% and <50% forest cover masks brought up frequent differences at a level higher than 0.05 NDVI in seven out of eight NFRs. An exception is the Sudetian region, where the data was highly consistent. Furthermore, the Mann-Whitney U non-parametric test revealed statistically significant differences in two regions: Baltic and Masurian-Podlasie NFR. The comparative analysis of NDVI confirmed that there is a need for additional investigation of the quality of newly developed forest mask combined with vegetation and meteorological data.
    Źródło:
    Leśne Prace Badawcze; 2016, 77, 2
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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