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Wyświetlanie 1-15 z 59
Tytuł:
Wartość zasobów drzewnych wybranych drzewostanów bukowych i jodłowych w Beskidach
Timber value of selected beech and fir stands in the Beskidy Mountains
Autorzy:
Zygmunt, R.
Banas, J.
Bujoczek, L.
Zięba, S.
Powiązania:
https://bibliotekanauki.pl/articles/985876.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
Beskidy
drzewostany bukowe
drzewostany jodlowe
zasobnosc drzewostanu
System Informatyczny Lasow Panstwowych
zasoby drzewne
wartosc pieniezna
wartosc sprzedazy
wartosc lasu
monetary value tariff
inventory of wood resources
Opis:
The paper presents assessment of the value of selected beech and fir stands by the classic method and using the value tariff in two ways. The aim of the work was to verify the suitability of the local tariff method based on the SILP forest database for the valuation of timber resources in forests. The measurements were carried out in the Beskidy Mountains (southern Poland). The reference sales value of the beech and fir stands with the growing stock from 61 to 643 m3/ha ranged from 6,307 to 102,438 PLN/ha. The average value of stands is about 45,000 PLN/ha and the standard deviation around 20,000 PLN/ha, with an average volume of 340 m3/ha and standard deviation of 140 m3/ha. The monetary value of the uneven−aged fir and beech stands calculated by the mean of the local tariff of value (method 1) was different from the values calculated either basing on the traditional method or on the method 2. However, the difference was on average 11% when it came to the previous, and about 2.2% when for the latter method. Almost 50% of the stands were valuated using the second method with an error of ±2.5%, the maximum extreme negative error being –14% and the maximum extreme positive error being +11%. As soon as the calculation process were automatised, the present method to obtain the local monetary value tariff of forest resources could become a practical tool in the process of forest resources valuation for the needs of the State Forests and as such it could replace the so−far used stand value tables.
Źródło:
Sylwan; 2018, 162, 09; 718-726
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optymalizacja wieku dojrzałości rębnej drzewostanów z punktu widzenia wiązania węgla
Optimizing the stand rotation age from the point of view of carbon sequestration
Autorzy:
Wysocka-Fijorek, E.
Zając, S.
Powiązania:
https://bibliotekanauki.pl/articles/988959.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
gospodarka lesna
drzewostany sosnowe
drzewostany bukowe
dojrzalosc rebna
wiek dojrzalosci rebnej
optymalizacja
wiazanie wegla
wzory empiryczne
wspolczynniki przeliczeniowe
optimization of the rotation age
carbon dioxide accumulation
timber production
Opis:
The selection of the rotation time of a stand (from planting to final felling), i.e. the age at which stand reaches harvest maturity, is a key decision in forest management due to, inter alia, the amount and value of carbon stored in the forest. In this context, the basis for the economic optimisation of the rotation age of forests is to define the goal of forest production and desirable state of forests ensuring the achievement of the adopted aim. Therefore, the choice of the most suitable optimal moment of completing a production cycle and starting the subsequent one is very important in forest management. The aim of the performed analysis is to verify the empirical equations and conversion factors as well as to assess their suitability for determining the volume and value of standing timber and accumulation of carbon in the aboveground woody biomass. The verified equations will be used for modelling the optimal rotation age of forests due to the maximization of the rate of carbon accumulation in the aboveground woody biomass. The input data for the verification of equations and conversion factors were grouped according to the dominant species, 10−years age subclass and site index class. Four methodological approaches were used to analyse and estimate the amount of carbon accumulated in the aboveground woody biomass. With the assumption of a continuous use of forest land for timber production, the generated revenues will be same at the same level of costs in the subsequent production cycles. Analysing the results of the optimization of the age of felling maturity it should be noticed that these are the averaged values relating to the State Forests. They do not take into account local differences in the price of raw wood and production costs including the specific characteristics of individual trees or stands. The accuracy (quality) of calculating the average and current increment of stands and, in consequence, of the amount and value of the accumulated carbon is important for the effectiveness of the optimization of the amount of carbon accumulated in the aboveground woody biomass.
Źródło:
Sylwan; 2017, 161, 11; 883-891
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Liczebność odnowienia naturalnego w lukach w drzewostanach jodłowo-bukowych w Świętokrzyskim Parku Narodowym
Number of natural regeneration of gaps in fir-beech stands in the Swietokrzyski National Park
Autorzy:
Wrzesiński, P.
Dobrowolska, D.
Krajewski, S.
Zajączkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/989083.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
Swietokrzyski Park Narodowy
drzewostany jodlowo-bukowe
luki drzewostanowe
wielkosc luki
odnowienia naturalne
podrost
sklad gatunkowy
jodla pospolita
Abies alba
buk zwyczajny
Fagus sylvatica
wzrost roslin
gap dynamics
canopy gaps
disturbance
shade tolerance
competition
Opis:
Forest gaps, openings in the canopy caused by death of one or more trees, are the dominant form of natural disturbance in the temperate forests. Gaps play a critical role in driving stand dynamics and influencing forest growth cycle. They increase habitat diversity, structural complexity, fauna and flora species diversity. The size of a gap may strongly influence tree species regeneration composition, vegetation growth, nutrient cycling, microclimate and may have considerable effect on a number of biological processes. The main aim of this study was to understand the effects of gap size diversity on species composition and number of natural regeneration. The study was carried out in near−natural mixed stands dominated by beech (Fagus sylvatica L.) and silver fir (Abies alba Mill.) representing different development stages and phases in the Świętokrzyski National Park, (central Poland). All gaps over than 20 m 2 intersected by a transects line were sampled. All saplings and seedlings were counted in circular plots (10 m²) evenly spaced along the long axis in the N−S and E−W gradients of each gap. Natural regeneration was analyzed for 62 canopy gaps of various sizes. The gaps were classified into three size classes: small ≤100 m², medium 101−250 m² and large >250 m². The gap size ranged from 21 to 397 m², with a median of 104 m². The dominant tree species regenerated in gaps were fir (69%) and beech (24%). The number of regeneration significantly depended on the gap size (p=0.027). The highest frequency of saplings was found in gaps of ≤100 m². The number of natural regeneration was significantly negatively correlated with gap size (r=–0.261, p=0.040). The density of silver fir regeneration was significantly higher in gaps of ≤100 m² and 101−250 m² (p<0.05). The share of fir in stand species composition effected on the number of silver fir and European beech regeneration. The results of this study demonstrated the utility of gap−based approach for better understanding ecosystem responses to tree cutting for modern forest management.
Źródło:
Sylwan; 2017, 161, 06; 485-495
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Czasochłonność zrywki konnej w drzewostanach trzebieżowych
Time consumption of horse skidding operations in thinned stands
Autorzy:
Szewczyk, G.
Powiązania:
https://bibliotekanauki.pl/articles/1009544.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewostany sosnowe
drzewostany jodlowe
drzewostany bukowe
drzewostany swierkowe
trzebieze
zrywka drewna
zrywka konna
czasochlonnosc
struktura czasu pracy
horse skidding
time consumption
work time
workday structure
Opis:
The paper presents time consumption assessment model (EST) of horse skidding operations in thinned stands taking into consideration factors related to stand, workday structure and characteristics of harvested timber. Significant differences in time consumption levels were observed between early and late thinning operations, as well as between examined pine, beech, spruce and fir stands. The strongest correlation between the EST and the analyzed variables was observed in the case of factors related to the volume of extracted timber.
Źródło:
Sylwan; 2010, 154, 01; 52-63
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Objawy zamierania bukow oraz zwiazek miedzy stopniem uszkodzenia drzew a wybranymi cechami taksacyjnymi drzewostanow
Autorzy:
Szczepkowski, A
Powiązania:
https://bibliotekanauki.pl/articles/820957.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
drzewostany bukowe
uszkodzenia drzew
cechy taksacyjne
buk zwyczajny
bonitacja
wiek drzewostanu
typy siedliskowe lasu
lesnictwo
Fagus sylvatica
zamieranie drzew
zwarcie drzewostanu
drzewa lesne
Źródło:
Sylwan; 2001, 145, 01; 85-99
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Jodła pospolita (Abies alba Mill.) w drzewostanach zespołu żyznej buczyny karpackiej (Dentario glandulosae-Fagetum)
Common fir (Abies alba Mill.) in stands of the complex of the fertile carpathian beech (Dentario glandulosae-Fagetum)
Autorzy:
Sugiero, D.
Powiązania:
https://bibliotekanauki.pl/articles/1022742.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
jodla pospolita
wzrost roslin
odnowienia lasu
zyzna buczyna karpacka
Abies alba
lesnictwo
Nadlesnictwo Krasiczyn
drzewostany jodlowo-bukowe
drzewa lesne
common fir
common beech
fertile carpathian beech forest (dentario glandulosae−fagetum)
fir−beech stand
Opis:
This study presents results of measurements carried out in 2001 in five two−generation mature fir−beech stands growing on the upland forest site in the Krasiczyn Forest Division (Krosno Regional Direction of State Forests − RDSF). The collected experimental material was subjected to analysis in individual stand strata from the point of view of the evaluation of the condition and growth and regeneration potentials of the common fir as an important admixture species in stands of the fertile Carpathian beech complex.
Źródło:
Sylwan; 2005, 149, 11; 42-49
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza wydajności zrywki drewna w drzewostanach bukowych
The efficiency analysis of skidding and forwarding in beech stands
Autorzy:
Sieniawski, W.
Powiązania:
https://bibliotekanauki.pl/articles/1009738.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
drzewostany bukowe
zrywka drewna
wydajnosc pracy
lesnictwo
pozyskiwanie drewna
beech
efficiency
harvesting
skidding
forwarding
Opis:
The purpose of research was to analyse the efficiency of skidding and forwarding as well as relationships between these stages in beech stand. The large−sized wood was dragged by LKT 120 skidder, while middle−sized wood was loaded on trailer with tractor URSUS C330. The regression equations for determination of skidding cycle time and daily skidding efficiency were worked out. Average skidding efficiency amounted 21,99 m3/8 lh (labour hours) for large−sized and 15,68 m3/8 lh for middle−sized wood.
Źródło:
Sylwan; 2009, 153, 07; 466-471
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Średnia biomasa osobnicza zgrupowań biegaczowatych w produkcyjnym cyklu drzewostanów bukowych w Dolinie Ruhry (zachodnie Niemcy)
Mean individual biomass of carabid assemblages in the productive cycle of beech forests in the Ruhr Valley (Western Germany)
Autorzy:
Schreiner, A.
Powiązania:
https://bibliotekanauki.pl/articles/1006304.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
Dolina Ruhry
drzewostany bukowe
owady
biegaczowate
Carabidae
lownosc
srednia biomasa osobnicza
carabidae
mib
beech forest
succession
logistic growth
Opis:
Number of carabid beetles, length of C. violaceus elytra and MIB of all carabids were studied subsequent to pitfall−trapping in 14 beech stands of increasing age (1−165 years) in Western Germany. The beech stands seemed to offer fairly constant feeding conditions for C. violaceus (and relatively small decrease in rather low level of degradation in the plantation). In total, 5,536 carabid individuals were trapped, which revealed significant increase of MIB (from 156.88 to 733.63 mg) following the logistic growth function. Due to incomplete degradation of the stands (on 'rich' soil and after using specific beech−harvesting techniques), there is a high baseline MIB at t=0 and an early onset of regenerative succession. The curve's gradient is steep and MIB reaches final value of about 650 mg in timber stands. Such high value may be explained by the good quality of loam soils in the area under study. In conclusion, logistic MIB function was calculated that describes regenerative beech succession on 'rich' soil and may help foresters to identify areas of disturbed succession.
Źródło:
Sylwan; 2012, 156, 11; 833-842
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Miąższość i jakość 20-letnich drzewostanów bukowych krajowych proweniencji
Ob''em i kachestvo bukovykh nasazhdenijj otechestvennykh proiskhozhdenijj v vozraste 20 let
Volume and quality of beech stands of Polish provenances in age of 20 years
Autorzy:
Rzeznik, Z.
Powiązania:
https://bibliotekanauki.pl/articles/815635.pdf
Data publikacji:
1988
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
hodowla lasu
drzewostany bukowe
miazszosc drzewostanow
buk
Fagus sylvatica
proweniencje
Źródło:
Sylwan; 1988, 132, 08
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Roślinność naturalna acidofilnej dąbrowy i plantacji sosny, daglezji i buka w rezerwacie Dąbrowa Krzymowska (Puszcza Piaskowa)
Natural vegetation of acidophilous oak forest and Scots pine, Douglas fir and beech plantation in the Dabrowa Krzymowska nature reserve (Piaskowa Forest)
Autorzy:
Puchałka, R.
Płąchocki, D.
Powiązania:
https://bibliotekanauki.pl/articles/990889.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
Puszcza Piaskowa
rezerwaty przyrody
rezerwat Dabrowa Krzymowska
zespol Calamagrostio-Quercetum
roslinnosc
analiza porownawcza
plantacje drzew lesnych
drzewostany sosnowe
drzewostany daglezjowe
drzewostany bukowe
calamagrostio arundinaceae−quercetum
forest plantations
nature protection
Opis:
Phytosociological relevés from a natural acidophilous oak forest Calamagrostio−Quercetum, as well as Scots pine, Douglas fir and beech plantations located in the same habitat were analysed. Our investigations did not confirm the negative effect of Scots pine on biodiversity. We observed a decline of species number with the decrease of light availability. The undergrowth biodiversity in the oak forest was reduced by the presence of beech the most. The observed quantitative and qualitative differences among the compared forests resulted from the combined effects of light availability, the character of plant litter, agrotechnical works, as well as dispersal abilities of plant species.
Źródło:
Sylwan; 2014, 158, 03; 212-220
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zmiany w dwóch zespołach buczyn pomorskich w rezerwacie Kołowskie Parowy (Puszcza Bukowa) w latach 1985-2006
Changes in two Pomeranian beech forest communities in the Kolowskie Parowy nature reserve (Bukowa Forest) between 1985 and 2006
Autorzy:
Puchałka, R.
Powiązania:
https://bibliotekanauki.pl/articles/990979.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
Puszcza Bukowa
drzewostany bukowe
rezerwat Kolowskie Parowy
zbiorowiska lesne
zespol Luzulo pilosae-Fagetum
zespol Galio odorati-Fagetum
flora
rosliny naczyniowe
roznorodnosc gatunkowa
zmiany florystyczne
beech
nature protection
forest management
biodiversity
gaps
Opis:
The paper presents the analysis of changes in two beech forest communities in the Kołowskie Parowy nature reserve (NW Poland). Within 21 years the frequency and cover of most species significantly decreased, including typical taxa for shady deciduous forests. Analysis of ecological indicator values showed that species richness is strongly correlated with light availability. The results suggest that passive protection promoted in Puszcza Bukowa forest brings negative effects for vascular plants biodiversity.
Źródło:
Sylwan; 2014, 158, 09; 695-703
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 59

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