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Wyszukujesz frazę "ecosystems" wg kryterium: Temat


Wyświetlanie 1-4 z 4
Tytuł:
Modele stosowane do opisu architektury drzew i możliwości ich praktycznego wykorzystania w leśnictwie
Tree architecture descriptive models with forestry applications
Autorzy:
Kędra, K.
Stereńczak, K.
Gazda, A.
Powiązania:
https://bibliotekanauki.pl/articles/978911.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
forest modelling
forest ecosystems
remote sensing
geometry
Opis:
The qualitative and quantitative descriptive models of tree architecture differ in the degree of complexity and the way of mapping tree structure, and thus, are of varied use in forestry. The qualitative, Hallé−Oldeman models, serve as a framework for analyzing tree architecture and help define the different components of a tree branching system. Among the quantitative models (here: horizontal, three−dimensional or vertical ones) the horizontal representations are the most parsimonious, and proved to be useful for examining the effects of competition process and the light conditions within the forest understory. The three−dimensional representations (Quantitative Structural Models; QSMs) have the widest range of applications as they may be used for deriving both the two−dimensional traits (such as crown length or branch height) and the volumetric traits (such as tree crown volume or wood volume). At the same time they are the most complex ones. The vertical models were used to study the impact of local terrain shape and wind conditions on tree architecture, but the way of deriving such models from the QSMs seems excessively laborious. However, we highlight here also a photogrammetric method, which allows to obtain an analogous model in much simpler way. Both three−dimensional and vertical representations are useful for determining the wood quality features. Three−dimensional models can be used to accurately measure tree woody biomass, while horizontal models can be used for reliable biomass estimations.
Źródło:
Sylwan; 2020, 164, 09; 707-718
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Waloryzacja ekosystemów leśnych LKP "Lasy Spalsko-Rogowskie" z wykorzystaniem mrówek nadrzewnych (Formicidae)
Valorization of the forest ecosystems of the 'Lasy Spalsko-Rogowskie' Forest Promotional Complex based on arboreal ants (Formicidae)
Autorzy:
Mazur, S.
Powiązania:
https://bibliotekanauki.pl/articles/993211.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
lesne kompleksy promocyjne
Lesny Kompleks Promocyjny Lasy Spalsko-Rogowskie
ekosystemy lesne
waloryzacja
bioindykatory
mrowki nadrzewne
arboreal ants
valorization
forest ecosystems
Opis:
The paper attempts to valorize the forest ecosystems basing on zooindication method with use of arboreal ants. 2002 specimens, belonging to 17 species, were collected in the 'Lasy Spalsko−Rogowskie' Forest Promotional Complex (central Poland). Deciduous forest habitats (fresh mixed deciduous forest, moist deciduous forest and fresh deciduous forest) turned to be the most preferred, whereas the highest biodiversity was found on the marshy coniferous forest. Two relict and very rare species of the arboreal ants (Dolichoderus quadripunctatus and Camponotus fallax) were recorded for the first time ever.
Źródło:
Sylwan; 2013, 157, 05; 330-335
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:
Ocena wielkości wymywania jonów K+, Ca2+ i Mg2+ w wybranych drzewostanach w warunkach kwaśnej depozycji
Assessment of K+, Ca2+ and Mg2+ volume leaching in selected tree stands under conditions of acidic deposition
Autorzy:
Kozłowski, R.
Jóźwiak, M.
Jóźwiak, M.A.
Bochenek, W.
Powiązania:
https://bibliotekanauki.pl/articles/1008701.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
gory
Gory Swietokrzyskie
Beskid Niski
pogorze
drzewostany
sklad gatunkowy
jony wapnia
jony magnezu
jony potasu
wymywanie jonow
depozycja kwasna
zanieczyszczenia powietrza
zanieczyszczenia chemiczne
opady atmosferyczne
odczyn opadow atmosferycznych
acid deposition
forest ecosystems
canopy leaching
throughfall
stemflow
Opis:
The study was conducted in the central part of the Świętokrzyskie Mountains as well as in the Beskid Niski Mountains in the years 2008−2010. Canopy budget model according to Ulrich was used. Paper presents analysis and assessment of the differences between two forest ecosystems under of acidic deposition.
Źródło:
Sylwan; 2012, 156, 08; 607-615
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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