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Wyszukujesz frazę "the function of the forest" wg kryterium: Wszystkie pola

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Economic and tourist functions of the forests in Lublin province
    Autorzy:
    Mazurek-Kusiak, A. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/96158.pdf
    Data publikacji:
    2018
    Wydawca:
    Fundacja Ekonomistów Środowiska i Zasobów Naturalnych
    Tematy:
    forest
    Lublin province
    forest function
    las
    województwo lubelskie
    funkcja lasu
    Opis:
    The research objective was to present social and economic functions of forests in Lublin Province against the background of other Polish provinces, at the same time pointing at the most important functions performed by the forests of the studied region. The research was conducted with the use of the diagnostic survey method by employing the technique of questionnaire, statistical data analysis and the analysis of the documentation made available by the Directorate of National State Forests. The forests of Lublin Province yield the most forest berries in Poland (on average 2725,29 tons a year). The main motivation for visiting forests among rural residents and inhabitants of small towns is the collection of forest berries and mushrooms; 61.0% and 50.8% respectively, while for inhabitants of larger cities it is recreational tourism and rest opportunities (67.8%). The added value of the study is cohesive factsheet of the economic and social functions of forests in the Lublin Voivodship.
    Źródło:
    Ekonomia i Środowisko; 2018, 2; 216-230
    0867-8898
    Pojawia się w:
    Ekonomia i Środowisko
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Current state of Picea abies stands in the Ukrainian Carpathians
    Autorzy:
    Guz, M
    Powiązania:
    https://bibliotekanauki.pl/articles/41137.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    international conference
    Europe
    forest ecosystem
    plant breeding
    tree
    Norway spruce
    Picea abies
    environmental function
    forest type
    composition
    productivity
    Carpathians Mountains
    Ukraine
    Opis:
    The paper provides a detailed characterisation of Norway spruce stands in the Ukrainian Carpathians. The majority of natural spruce stands in Ukraine occur in Polesie, while artificial regeneration is spread all over the country. The most densely forested part of Ukraine is the Carpathian region with 41.1% of forest-covered area (2.1 million ha). Spruce-dominated stands occupy about 700 thousand hectares (30%) of the forested area of the state forest fund in the Ukrainian Carpathians, and another 10% of the mixed forests contain 10 to 30% of spruce. Besides pure spruce stands, there are beech-spruce, beech-fir-spruce, and cedar-spruce stands. The most productive stands (750-900m3 stem wood per ha) grow in the middle and lower parts of slopes at 1100-1200 m a.s.l. which have favourable soil and climate conditions. Since the second half of the 20th century, spruce stands in the substantial part of the Ukrainian Carpathians have declined under the influence of complex anthropogenic and natural factors. Although the present condition of most spruce forests in this region remains satisfactory, the degradation processes and the ban imposed in 2006 on planting spruce on non-spruce forest sites (in state forests) may decrease their area in the longer term.
    Źródło:
    Dendrobiology; 2009, 61 Supplement
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of variability of water resources in lowland forests on selected parameters describing the condition of trees
    Autorzy:
    Tyszka, J.
    Stolarek, A.
    Fronczak, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/11996.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    variability
    water resource
    lowland forest
    climatic function
    hydrological function
    selected parameter
    tree condition
    periodical change
    stand condition
    extreme climate
    water condition
    river list
    habitat condition
    tree stand
    Opis:
    The influence of water conditions on the condition and growth of tree stands has been analysed in the context of the climatic and hydrological functions forest plays. Long observational series obtained for precipitation, outflow and depths below the surface of the water table have been put together with measured increases in the breast-height diameters of Scots pines and the severity of crown defoliation observable in selected tree species growing on the Polish Lowland, in order to determine the overall scope to the reaction stand condition manifests in the face of ongoing variability of water conditions within forest. An overall improvement in the condition of stands over the last 20 years does not disguise several-year cyclicity to changes capable of shaping the situation, i.a. departures from long-term mean values for precipitation totals and groundwater levels. The condition of stands is seen to worsen in both dry and wet years. Analysis of the degree to which pine, spruce and broadleaved stands experience defoliation points to spruce stands responding most to extreme hydro-climatic conditions. Extreme situations as regards water resources were seen to involve a response over two-year time intervals in the case of coniferous stands. Unsurprisingly, optimal growing-season (June-September) precipitation totals correspond with long-term average figures, while being slightly higher for spruce (at 384 mm), than for Scots pine or broadleaved species (375 mm). The relationships reported gain confirmation in analysis of periodic change in breast-height diameter increments characterising Scots pines, whose growth is seen to depend closely, not only on precipitation, but also above all on the depth of the water table in the summer half-year. Optimal depths of the water table proved to be different, being around 20 cm below ground in the case of marshy coniferous forest, 80 cm in wet habitats, and 135 cm in fresh habitats. Depending on the possibilities for water to soak into the rooting zone of trees there were even twofold differences in measured growth increments in Scots pine (as the dominant species in Poland’s lowland habitats). The maintenance of stable water conditions (as the most variable environmental factor in forest) should be an overriding aim of management activity in this habitat. When account is taken of the influence of the state of water resources on biomass production, and then on the intensity of evapotranspiration and the absorption of carbon dioxide from the atmosphere, it is seen how important it is to achieve improvements in water conditions in forests, as such an important factor in combating climate change.
    Źródło:
    Papers on Global Change; 2014, 21
    2300-8121
    1730-802X
    Pojawia się w:
    Papers on Global Change
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of the possibility of applying selected pedotransfer functions for indicating the retention of forest soils in Poland
    Ocena możliwości zastosowania wybranych funkcji pedotransfer do wyznaczania retencji gleb leśnych w Polsce
    Autorzy:
    Hewelke, P.
    Hewelke, E.
    Cholast, S.
    Zakowicz, S.
    Lesak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/887209.pdf
    Data publikacji:
    2017
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    soil
    forest soil
    soil moisture content
    pedotransfer function
    water retention
    matrix potential
    Polska
    Opis:
    Assessment of the possibility of applying selected pedotransfer functions for indicating the retention of forest soils in Poland. Landscape retention influences the water balance of a catchment and the course of flooding events. The degree of retention capabilities of forest soils are much less known than the retention of land used for agriculture. Soil retention capacity influences the formation of a given forest habitat type, floristic species composition, as well as the type and quality of the stand of trees. The analysis was carried out for a regression model dedicated to selected forest soils within the area of Poland, as well as van Genuchten’s and Wösten’s, and Varallyay’s and Mironienko’s models. In order to assess the fit of the models, an independent series of forest soils were used. The models prepared for soils used for agricultural purposes do not result in statistically acceptable fit when it comes to the analyzed forest soils. The analysis of measured and calculated values of total available water indicate good fit of the regression model developed for the analyzed group of podzolic and brown forest soils.
    Ocena możliwości zastosowania wybranych funkcji pedotransfer do wyznaczania retencji gleb leśnych w Polsce. Retencja gleb leśnych w znacznym stopniu decyduje o bilansie wodnym zlewni i przebiegu zjawisk hydrologicznych, wpływa na kształtowanie się określonego typu siedliska lasu, skład florystyczny i jakość drzewostanu. Zdolności retencyjne gleb leśnych są znacznie mniej rozpoznane niż retencja gleb użytkowanych rolniczo. Retencja może być wyznaczona zarówno metodą bezpośrednią, jak i pośrednio za pomocą tzw. funkcji pedotransfer opisującej jej związek z określonymi właściwościami fizycznymi gleby. Analizę prowadzono dla modelu regresyjnego opracowanego dla wybranych gleb leśnych z obszaru Polski oraz dla modeli van Genuchtena i Wöstena oraz Varallyaya i Mironienki. Do oceny dopasowania modeli zastosowano niezależną serię gleb leśnych. Analiza pomierzonych i obliczonych wartości potencjalnej retencji użytecznej wskazuje na dobre dopasowanie modelu regresyjnego opracowanego dla badanej grupy gleb leśnych bielicowych i brunatnych. Modele opracowane dla gleb użytkowanych rolniczo nie dają akceptowalnego statystycznie dopasowania dla analizowanych gleb leśnych. Przeprowadzone badania potwierdzają lokalny charakter funkcji pedotransfer.
    Źródło:
    Scientific Review Engineering and Environmental Sciences; 2017, 26, 3[77]
    1732-9353
    Pojawia się w:
    Scientific Review Engineering and Environmental Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spatial autocorrelation of tree attributes in naturally regenerated managed beech (Fagus sylvatica) forests in the Beskid Niski Mountains, southern Poland
    Autorzy:
    Szmyt, J.
    Stoyan, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/41093.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    spatial structure
    spatial correlation function
    tree
    natural regeneration
    beech
    Fagus sylvatica
    beech forest
    forest
    Beskid Niski Mountains
    Polska
    Opis:
    European beech (Fagus sylvatica L.) is a widely distributed forest tree species in central, southern and western Europe. In Poland it reaches the eastern limit of its natural range. The three forest stands selected for the analysis presented here are located in the Dukla Forest Inspectorate, southern Poland in the Beskid Niski Mountains. The measurement plots were rectangular, 0.35 ha each, established under homogenous conditions. The origin of all stands is natural and up to now they were thinned several times according to selective thinning method. The main tree species on each plot is European beech. In each stand (x, y) coordinates, the species, total heights of trees and their diameters at breast height were recorded. Total tree height, diameter, basal area and tree volume were considered as marks in statistical analysis. The aim of this paper is to find out the differences in the spatial autocorrelation of different tree marks as well as to explain the reasons for differences if they were observed. The empirical mark correlation functions indicated that there is a negative spatial correlation of all these marks in all three forest stands, i.e. trees close together tend to have smaller marks than the average in the stand. No significant spatial correlation was found for the tree heights. Diameter, basal area and volume show some correlation, but only in one stand a deviation test showed that the detected spatial correlation is significant. The mark variograms indicated that neighboring trees tended to have similar sizes.
    Źródło:
    Dendrobiology; 2014, 71
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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