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Wyszukujesz frazę "subalpine forest" wg kryterium: Temat


Wyświetlanie 1-9 z 9
Tytuł:
Distribution and habitat conditions of Pinus cembra forests in the Tatra Mountains
Autorzy:
Zieba, A.
Rozanski, W.
Bukowski, M.
Ciesielska, B.
Szwagrzyk, J.
Tematy:
subalpine forest
Natura 2000 habitat
GIS analysis
habitat modelling
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Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Powiązania:
https://bibliotekanauki.pl/articles/2077747.pdf  Link otwiera się w nowym oknie
Opis:
Relic Pinus cembra forests were among the least studied plant communities in the Western Car- pathians. Their distribution in this mountain range is limited only to the Tatras. The lack of comprehensive research on the Polish and Slovakian sides of the Tatras led to considerable discrepancy regarding their distribution (300–1170 ha) as well as habitat conditions. Their occurrence on limestones and in the West- ern Tatras was contested. Therefore, the aim of this work was to determine the distribution and habitat conditions for the occurrence of Swiss stone pine forests in the Tatras. We mapped the entire range of the distribution of these forests, using the topographic method and digitized it in ArcGIS 10.2.2. Afterwards, we undertook spatial analysis, using DEM regarding their occurrence, depending on: altitude, inclination, solar radiation, exposure, geology and soil. To determine the preferable site conditions we used the logistic regression model. The total area of P. cembra forests in the Tatras is 916.93 ha. They occur in all mountain ranges within the Tatras. Altitude, inclination and solar radiation have significant impacts on the occur- rence of these forests. The odds of the occurrence of P. cembra forests increased by 0.5% for every 1 m of altitude, by 2% for every 1° of inclination and decrease by 0.1% for every 1 MJ/m2/year of solar radiation. The majority of these forests grow in the altitude range 1300–1650 m a.s.l. (95%) and on slopes with 20–60° inclinations (80%). Swiss stone pine forests occur both on slopes with low (1900 MJ/m2) and high annual solar radiation (3400 MJ/m2). They prefer slopes with North-western exposure. They may grow both on granite and limestone, while the majority of them were mapped on granite. Pinus cembra forests grow on diverse soils, both acidic and alkaline. Nevertheless, most of them occur on Haplic Podzols (52%). The results may be applicable to the Tatra National Park for the conservation and monitoring of this Natura 2000 habitat.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Coarse woody debris in mountain streams and their influence on geomorphology of channels in the Tatra Mts.
Autorzy:
Zielonka, A.
Ciapała, S.
Malina, P.
Piątek, G.
Tematy:
dendrochronology
CWD (coarse woody derbis)
stream channel
subalpine forest
Tatra Mts.
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Wydawca:
Stowarzyszenie Geomorfologów Polskich
Powiązania:
https://bibliotekanauki.pl/articles/294611.pdf  Link otwiera się w nowym oknie
Opis:
Dead wood plays important function in the riverine environment. Dead trees lying in stream channels modify the speed of the current and the shape of the channel, thus have a great influence on channel morphology. Coarse woody debris (CWD) exert influence on variation in channel width and gradient as well as promote lateral channel migration and sediment storage. In this paper we study the characteristics of dead wood delivered to two mountain streams, the Waksmundzki Stream and Pyszniański Stream in the Tatra Mts. The inflow of dead trees to the stream channels was determined with the use of dendrochronological methods. In both channels, a similar number of CWD was found – ca. 60 units per 100 m. In the Waskmundzki Stream more logs were aggregated in form of dams than in the Pyszniański Stream. The distribution of diameters, decay classes, and length classes was similar for both streams. Bank erosion is the most common cause of inflow of dead wood to the stream channel. Cross-dating of the moment of death of trees lying in the stream may indicate that inflow of dead wood to the channels is a continuous process. Fragmented remains of dead trees create geomorphological formations like dams and steps, which highly modify the channels.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relationship between forest canopy and natural regeneration in the subalpine spruce-larch forest (north-east Italy)
Autorzy:
Marchi, A.
Paletto, A.
Tematy:
relationship
forest canopy
natural regeneration
subalpine forest
spruce-larch forest
canopy closure
canopy cover
Italy
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Wydawca:
Instytut Badawczy Leśnictwa
Powiązania:
https://bibliotekanauki.pl/articles/38768.pdf  Link otwiera się w nowym oknie
Opis:
The authors describe the difference between canopy cover (proportion of the forest floor covered by the vertical projection of the tree crowns) and canopy closure (proportion of sky hemisphere obscured by vegetation when viewed from a single point) and the respective ground-based estimation techniques focused on two types of densiometer (GRS tube and spherical). The data collected in the field were used to analyse the relationship between forest canopy and natural regeneration in two subtypes of subalpine larch-spruce forests. The results indicate that in the first subtype characterized by a high fertility and a high canopy cover (around 62%), the level of natural regeneration is low (115 stems per hectare) and it is nearly exclusively composed by spruce [Picea abies (L.) Karst.]. For the second subtype characterized by a low fertility and a medium canopy cover (around 49%) the natural regeneration is rather dense (650 stems per hectare). At last the authors evidence a insignificant difference between the data of forest canopy collected by different ground-based estimation techniques (+0.7% using spherical densiometer compared to using GRS tube densiometer).
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Issues of secondary succession in the subalpine forest glades of the Carpathian Mountains. (Case study)
Autorzy:
Sosnowska, Agnieszka
Tematy:
secondary succession
Carpathian Mountains
Gorce National Park
subalpine forest glades
environmental protection
non-forest ecosystems
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Wydawca:
Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
Powiązania:
https://bibliotekanauki.pl/articles/2034216.pdf  Link otwiera się w nowym oknie
Opis:
Results of research on the process of spontaneous overgrowth of subalpine forest glades in the Gorce National Park are presented in the paper. Research was carried out in 2006-2008. The condition and directions of changes of glades undergoing conservation efforts of different intensity were examined.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics of humic substances in humid subalpine forest soils in Central Taiwan
Autorzy:
Chen, J S
Chiu, C.Y.
Tematy:
subalpine forest
temperature
humic acid
humification
humic substance
soil
Taiwan
ecosystem
forest soil
terrestrial ecosystem
fulvic acid
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Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Powiązania:
https://bibliotekanauki.pl/articles/1450325.pdf  Link otwiera się w nowym oknie
Opis:
The study site, 2700 m a.s.l., is located in the central Taiwan. A globally rare combination of the mean temperature (ca. 9.5 °C) and total annual precipitation (ca. 4100 mm) makes studies on pedogenic and edaphic processes of the moist soils in this area worthwhile. The study was undertaken to investigate distribution and characteristics of humic substances in this subalpine forest ecosystem. Fulvic acids comprised a higher total organic carbon fraction (1.8 to 25%) than humic acids (1.1 to 13.4%). Fulvic acids were more mobile and migrated downwards to deeper horizons. Comparatively, humic acids were distributed more in the surface horizons. The hu- mification index, based on E4/E6, showed that humification varied in different horizons even in the same profile. The AlogK and RF values indicate that the types of humic acids extracted from Tsuga forest soil are grouped as P or A types, whereas Rp or B types are in Picea forest soil, suggesting a high degree of humification of humic acids in such soils. Features of the absorption spectra were consistent with the classification of humic acids with A logK and RF values. Humification indices and humic acid types in these subalpine soils indicate that they are similar to acidic soils elsewhere with abundant rainfall and cold climate.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ czynników siedliskowych na bogactwo gatunkowe i strukturę zbiorowisk porostów epifitycznych w starych górnoreglowych drzewostanach świerkowych Babiogórskiego Parku Narodowego
Influence of habitat factors on species richness and composition of epiphytic lichen communities in upper subalpine spruce forest in Babia Góra National Park
Autorzy:
Kosek, Dagmara
Opis:
Tematem pracy jest sprawdzenie relacji pomiędzy parametrami drzewa oraz zmiennymi środowiskowym a składem gatunkowym porostów. Pozwoli to na poznanie zależności, które mają wpływ na występowanie gatunków oraz kształtują zbiorowiska porostów w pierwotnym górnoreglowym borze świerkowym na Babiej Górze. Kanoniczna analiza zgodności wykazała, że występowanie i skład gatunkowy porostów zależy od udziału świerka, zwarcia drzewostanu oraz wieku, obwodu drzewa i wysokości oraz strony świata i wysokości n.p.m. Wraz ze wzrostem wieku drzewostanu oraz wielkości drzew zmienia się skład gatunkowy porostów. W skali pojedynczego drzewa w zależności od ekspozycji względem stron świata, występowanie gatunków jest zmienne a zbiorowiska porostów są różnorodne. W przedziale wysokościowym w obrębie regla górnego obserwowane są wyraźne różnice w rozmieszczeniu gatunków. Ważność istnienia starych drzewostanów potwierdzona została odnalezieniem gatunków wskaźnikowych dla ciągłości ekologicznej i lasów pochodzenia pierwotnego o nienaruszonym środowisku.
The theme of the thesis is to determine the relationship between tree parameters and environmental variables on lichens species composition. This will allow to explore the relationships that influence on the occurrence of species and lichens communities in the primary upper subalpine spruce forest on Babia Góra massif. The canonical correlations analysis showed, that the occurrence of lichens and species composition depends on the share of spruce, canopy and stand age, tree circumference, height, side of the world and altitude. With the increasing stand age and tree size, lichen species composition is changing. On the scale of a single tree, depending on the exposure to the world, the occurrence of species is variable and lichen communities are diverse. During the height within the upper- subalpine forests, marked differences are observed in the distribution of species. The importance of the existence of the old stands have been confirmed finding indicator species for ecological continuity of forests and the origin of an undisturbed environment.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Inne
Tytuł:
Tempo wzrostu jarzębiny (Sorbus aucuparia L.) a rozpad górnoreglowego drzewostanu świerkowego
The growth rate of rowan [Sorbus aucuparia L.] versus subalpine spruce stand break down
Autorzy:
Żywiec, M.
Tematy:
wzrost roslin
odnowienia lasu
Babia Gora
tempo wzrostu
drzewostany swierkowe
lasy gorskie
Sorbus aucuparia
zamieranie lasow
regiel gorny
lesnictwo
jarzab pospolity
luki drzewostanowe
babia góra national park
sorbus aucuparia l.
subalpine spruce forest
growth rate
stand breakdown
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Wydawca:
Polskie Towarzystwo Leśne
Powiązania:
https://bibliotekanauki.pl/articles/1012925.pdf  Link otwiera się w nowym oknie
Opis:
The paper presents temporal relationships between the breakdown of tree stand in the subalpine spruce forest and the regeneration of rowan (Sorbus aucuparia L) as well as the rate of height growth of rowan stems. Rowans growing in a large gap recruited mostly from the seedling and sapling bank established under the living spruce stand before its breakdown. The rate of stem height growth was five times higher after the gap formation than under spruce stand. In spite of considerable age differences of rowans the variability in their final height after over 20 years of rapid growth was small.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pochodzenie Galium schultesii i Stellaria holostea w Bieszczadach (Karpaty Wschodnie) : refugium glacjalne czy genetyczny tygiel?
The origins of Galium schultesii and Stellaria holostea in the Bieszczady Mts (Eastern Carpathians) : glacial refugium or genetic melting pot?
Autorzy:
Watrak, Grzegorz
Boroń, Piotr
Wróblewska, Ada
Bąba, Wojciech
Mitka, Józef
Wątroba, Marta
Opis:
The aim of the paper was to test the hypotheses on the genetic structure and origins of forest herbaceous plant species, Galium schultesii and Stellaria holostea, in the subalpine zone of the Bieszczady Mts. The species are generally the lowland elements occurred in fertile oak-hornbeam forests. Their extrazonal occurrence in the mountain subalpine zone could be an effect of recent, Holocene migrations from various glacial refugia or the surviving in situ the last glacial maximum (LGM) in cryptic forest refugia. The two hypotheses were tested with the use of AFLP genetic fingerprinting and the patterns of bands distribution were established based on General Linear Models (GLMs) and STRUCTURE analysis. Twenty nine populations of G. schultesii and thirty five population of S. holostea were sampled in the Carpathians, Transcarpathia, Pannonian Basin, Transilvania and Podolia. They were characterized by 200 and 219 AFLP loci, respectively. The Bieszczady’s populations of both species, as a geographical group, were not divergent from the adjoining regions (Analysis of Molecular Variance AMOVA, p > 0.05). In G. schultesii a group of AFLP bands in three populations from the Bieszczady Mts. were found in Transcarpathia and the Piatra Craiului Mts (E Carpathians). In S. holostea a group of AFLP bands were found in four of the Bieszczady’s populations, in the Eastern Romanian Carpathians (the Maramaros and Kelemen Mts.), and the Sandomierz Basin (Niepołomice Forest, north of W Carpathians). Both groups could have reflected a refugial pattern. The putative refugial vs. non-refugial groups had statistically significant between group variation (AMOVA) for both G. shultesii (4,8%, p = 0.006) and S. holostea (11,2%, p < 0.001). Statistical analysis showed that putative refugial group of S. holostea had statistically significantly lower indices of genetic richness FA (p = 0.03) and FAmax (p = 0.01), and higher divergence DW index (p = 0.002), in comparison to the non-refugial group. It could be an effect of the genetic bottleneck. Galium schultesii had significantly higher indices of genetic diversity: PPL (p = 0.008), Nei’s h (p = 0.037), Shannon I (p < 0.001), and divergence DW index (p = 0.007) in the putative refugial group. Probably both forest herbs could have persisted the LGM in the Bieszczady Mts.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Budowa, struktura i dynamika górnoreglowych borów świerkowych o charakterze pierwotnym w dolinach Pańszczycy i Stawów Gąsienicowych (Tatrzański Park Narodowy) w okresie kontrolnym 1991 - 2002
The structure, composition and dynamics of subalpine primeval spruce forests in the Panszczyca Valley and the Stawy Gasienicowe Valley [in the Tatra National Park] during the control period 1991-2002
Autorzy:
Karczmarski, J.
Tematy:
dynamika drzewostanu
sklad gatunkowy
Tatrzanski Park Narodowy
drzewostany swierkowe
Dolina Panszczycy
lesnictwo
proces dorastania
struktura drzewostanu
zasobnosc drzewostanu
budowa drzewostanu
Dolina Gasienicowa
regiel gorny
proces ubywania
przyrost drzewostanu
stand structure
stand dynamics
natural development cycle
primeval forest
spruce
subalpine zone
poland
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Wydawca:
Polskie Towarzystwo Leśne
Powiązania:
https://bibliotekanauki.pl/articles/1016108.pdf  Link otwiera się w nowym oknie
Opis:
The research presents changes (in the period of 1991−2002) in species composition, volume, dbh structure, height and storey structure, increment value, self−thinning rate and regeneration dynamics of the primeval−type spruce forests of the upper montane zone in the Pańszczyca Valley and the Stawy Gąsiennicowe Valley in the Tatra National Park on the example of three permanent experimental plots. The stands under study (as compared with other stands in the Polish Carpathians from the similar altitudinal zone, feature high productivity expressed by the current annual volume increment value of 4.1−4.5 cu.m./ha, diverse structure and composition depending on the represented stages and phases of stand development, as well as high stand stability.
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-9 z 9

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