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Wyszukujesz frazę "uneven−aged" wg kryterium: Temat


Wyświetlanie 1-7 z 7
Tytuł:
Wound healing rate in oriental beech trees following logging damage
Autorzy:
Tavancar, F.
Picchio, R.
Lo Monaco, A.
Nikooy, M.
Venanzi, R.
Bonyad, A.E.
Powiązania:
https://bibliotekanauki.pl/articles/962357.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
Tematy:
fagus orientalis
uneven-aged stand
single-tree selection
diameter
growth
height growth
tree biosocial class
Opis:
Beech is the most important commercial species in the Caspian forests of Iran. Selective cutting and harvesting methods may adversely impact the quality of the residual trees, as the injuries make the trees prone to future disease, insect infestations or timber defects. Although attempts to better understand how wounds affect the residual trees have been made in many different contexts, there are still few investigations on uneven-aged forests. In this study the key objectives were to determine and model the healing rate for different wound parameters (width, length, and area of wound); to analyse the relationship between wound healing rate (WHR), tree diameter growth and tree height growth; to analyse the WHR in relation to wound position on the stem; and to analyse the relationship between WHR, width and area of wound in DBH classes and social classes, with the aim of enabling the prognosis of logging wounds. Wounded beech trees were examined immediately after selective logging and after a 5-year period. The WHR was 31.2 ±7.7 cm2 year-1. The wound width healing rate (18.4 ±3.4 mm·year-1) was significantly higher than the wound length healing rate (4.5 ±1.6 mm·year-1). Only 12% of wounds were completely closed after a 5-year period, and 15 years are necessary for the complete closure of 80% of total wounds. The ratio of wound area to stem area at wound height (RWS) showed a more pronounced effect on diameter than on height. Regression analysis showed that WHR was correlated negatively with wound area and width and positively with tree diameter growth, but no significant relationship was found between height growth and WHR parameters. The WHR was significantly higher at an upper position than at a lower one, and statistical tests showed that the tree vertical layering classes had a significant effect on WHR. Finally, it was shown that WHRs in upper-storey trees are significantly higher than in the middle and lower storeys.
Źródło:
Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2019, 62, 203
1644-3985
Pojawia się w:
Drewno. Prace Naukowe. Doniesienia. Komunikaty
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
System planowania urządzeniowego w lasach różnowiekowych
System of management planning in uneven-aged forests
Autorzy:
Banaś, J.
Powiązania:
https://bibliotekanauki.pl/articles/1008979.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
urzadzanie lasu
planowanie
procesy decyzyjne
drzewostany roznowiekowe
fazy rozwojowe
uneven−aged forests
management planning
silvicultural treatments
catchment
Opis:
In the presented forest planning system, decisions are being made at several stages related to the management planning units: catchment area, stand and forest management unit. Management operations are planned with regard to the development phase of a stand and no its age. Stands in which silvicultural treatments are to be carried out are selected after a detailed analysis of natural factors and an economic analysis. The discussed planning system can be an important tool supporting forest ecosystem management in the multiple−use forestry model currently in use.
Źródło:
Sylwan; 2010, 154, 07; 456-462
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Drzewostanowa metoda inwentaryzacji i kontroli lasów różnowiekowych
Stand-level inventory and control method for uneven-aged forests
Autorzy:
Banaś, J.
Powiązania:
https://bibliotekanauki.pl/articles/1022776.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
drzewostany roznowiekowe
drzewostany
metoda drzewostanowa
metody badan
monitoring
lesnictwo
inwentaryzacja lasu
uneven−aged forest
control sample plots
statistical−mathematical inventory system
Opis:
The paper presents a stand−level inventory and control method which can be useful in the inventory of uneven−aged forests. The method describes the variation in stem diameter and species structure in a specified stand and allows to define the intensity of processes: loss, ingrowth and increment and to analyse relationships between them.
Źródło:
Sylwan; 2005, 149, 11; 18-24
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kształtowanie zróżnicowanej struktury drzewostanów z wykorzystaniem metody BDq
Application of the BDq method in uneven-aged stands silviculture
Autorzy:
Brzeziecki, B.
Kornat, A.
Powiązania:
https://bibliotekanauki.pl/articles/973764.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
struktura drzewostanu
ksztaltowanie struktury
rozklad piersnic
metoda BDq
diameter distribution
stand conversion
stocking control
sustainable yield
uneven−aged
silviculture
BDQ method
Opis:
The BDq method, a tool of stocking control in uneven−aged stands, with a special reference to the problem of determining diameter structure of cuttings, is introduced. Both theoretical foundations, as well as a practical application of the BDq method are presented on the example of conversion of two−storied stands, consisting of silver fir and Scots pine, to stands characterized by a plenter−like structure.
Źródło:
Sylwan; 2011, 155, 09; 589-598
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cechy i wskaźniki zróżnicowania lasów różnowiekowych w różnych stadiach rozwoju
Characteristics and indicators of uneven-aged forest diversity at different developmental stages
Autorzy:
Poznański, R.
Powiązania:
https://bibliotekanauki.pl/articles/1013549.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
metody obliczen
drzewostany roznowiekowe
zroznicowanie
lesnictwo
stadia rozwojowe
wskazniki zroznicowania
characteristics and indicators of forest diversity in natural convention
uneven−aged forests
developmental stages
Opis:
The paper presents the results of assessment of the characteristics and indicators of uneven−aged forest diversity based on natural convention for different stages of development. The assessed characteristics and indicators included: the average diameter at breast height, natural self−thinning of trees, relative and real stocking and the variation in dbh distribution structure.
Źródło:
Sylwan; 2008, 152, 09; 21-30
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Podstawy nowoczesnych zasad gospodarowania w różnowiekowych lasach górskich
The foundations of modern management of uneven-aged mountain forests
Autorzy:
Poznański, R.
Powiązania:
https://bibliotekanauki.pl/articles/1009323.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
lasy gorskie
drzewostany roznowiekowe
drzewostany przerebowe
struktura drzewostanu
rozklad piersnic
inwentaryzacja lasu
gospodarstwa przerebowe
gospodarstwa przerebowo-zrebowe
miazszosc drzewostanow
gospodarka lesna
postepowanie hodowlane
uneven−aged forest
multi−storied forest
selection system
dbh distribution types
uneven−aged forest development stages
new prescribed cut referring to silviculture needs
new method of regulation of selection or near−selection forest type development
Opis:
In uneven−aged forests, age does not apply to the whole stand but to individual trees. Therefore age of individual trees is rather represented by their thickness, and dbh distribution types become the measure of their age. The distinguished dbh distribution types show individual uneven−aged forest development phases: type A – optimum phase, type B – initial phase, type C – future phase and type D – ageing phase. In the optimum uneven−aged forest development phase, 'prescribed cut according to silviculture needs' should be similar or equal to volume increment. In the initial development phase, such 'prescribed cut' should represent 60−80% of current volume increment, while in the future forest development phase, it should equal the current volume increment or exceed it by 20%. In the ageing forest development phase, 'prescribed cut according to silviculture needs' should be higher than the current volume increment by 10−30%. Selection−type forest management should be a model one for uneven−aged forests. Selection−type forests are close to the natural state and constitute a stable forest ecosystem with high resistance to biotic and abiotic factors and by reducing and dispersing the management risk they better fulfil their multiple functions.
Źródło:
Sylwan; 2010, 154, 09; 603-614
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Konwencje ustalania wskaźników zróżnicowania lasów
Conventions of determining indicators of forest diversity
Autorzy:
Poznański, R.
Powiązania:
https://bibliotekanauki.pl/articles/1012411.pdf
Data publikacji:
2008
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
metoda przyrodnicza
metody obliczen
drzewostany roznowiekowe
lasy
lesnictwo
metoda geometryczna
wskazniki zroznicowania
geometric and natural convention of determining indicators of forest diversity
uneven−aged forest
diversity characteristics
Opis:
There are two conventions of determining indicators of forest diversity: geometric and natural. Indicators in the geometric convention are determined from the ratio of differences in the values of the real characteristic to the value of the characteristic adopted as a comparative norm. Indicators in the natural convention are determined from the ratio of differences in the values of a characteristic in the real world to the mean value of that characteristic by standard deviation. The indicator−based assessment of forests in Poland is based on the geometric convention of similarities and standards included in yield and stand volume increment tables. This convention of similarities (map and plan scales) taken directly from technology has no natural justification. Therefore, it is necessary to determine indicators of forest diversity based on natural convention with special reference to the uneven−aged forests based on natural forests.
Źródło:
Sylwan; 2008, 152, 01; 53-57
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-7 z 7

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