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Wyświetlanie 1-15 z 16
Tytuł:
Kryterium ekonomicznej oceny szkód wyrządzonych przez zwierzynę płową w lasach
Kriterijj ehkonomicheskojj ocenki poter' prinosimykh olen'evymi v lesakh
Criterion of the economic appraisal of damage done by deer in forests
Autorzy:
Zajac, S.
Powiązania:
https://bibliotekanauki.pl/articles/816249.pdf
Data publikacji:
1976
Wydawca:
Polskie Towarzystwo Leśne
Źródło:
Sylwan; 1976, 120, 05
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Granica istotności szkód wyrządzanych przez zwierzynę płową w lasach
Granicy sushhestvennosti povrezhdenijj vyzvannykh olenievidnymi v lesakh
Limit of the significance of damage done by deer in forests
Autorzy:
Zajac, S.
Powiązania:
https://bibliotekanauki.pl/articles/821906.pdf
Data publikacji:
1974
Wydawca:
Polskie Towarzystwo Leśne
Źródło:
Sylwan; 1974, 118, 12
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zasady szacowania szkód wyrządzanych przez zwierzynę płową w lasach
Principy ocenki poter prinosimykh promyslovymi zhivotnymi v lesakh
Principles of the appraisal of damage done by deer in forests
Autorzy:
Zajac, S.
Powiązania:
https://bibliotekanauki.pl/articles/823917.pdf
Data publikacji:
1976
Wydawca:
Polskie Towarzystwo Leśne
Źródło:
Sylwan; 1976, 120, 06
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Teoria portfela w leśnictwie - optymalizacja składu gatunkowego drzewostanów
Portfolio theory in the forestry - optimization of the species composition
Autorzy:
Klocek, A.
Zając, S.
Powiązania:
https://bibliotekanauki.pl/articles/985859.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
teoria portfela
portfel inwestycyjny
wskaznik Sharpe'a
gospodarka lesna
zarzadzanie ryzykiem
minimalizacja ryzyka
drzewostany
sklad gatunkowy
optymalizacja
Opis:
The paper presents the assumptions of the portfolio theory and the possibilities of its application in the forestry to diversify the species composition of the stand. The decision problem concerns the rationalization of the species share, ensuring the optimal ratio of annual production value from 1 ha in the stand (financial effect) to the expected level of risk. The adopted measure of the assessment of the value of production and the risk of its achievement is the Sharpe index, which is an approximate measure of the correlation between the income of one investment and its market, and therefore a measure of systematic risk. The paper presents the theoretical foundations of the mentioned optimization problem and examples of research results of American and European scientists regarding applications of portfolio theory in the forestry. The research results indicate that the portfolio theory in forestry focuses on making investment decisions in conditions of high uncertainty. The main criteria for selecting these decisions are income and risk. Diversification of the share of various investments is the source of the so−called risk diversification effects, e.g. the share of particular species in the composition of the stand, the assortment structure and other natural and economic factors that cause a reduction in the total risk with the same income or an increase in the total income with the same risk. The paper indicate that in forest management it is possible and justified to use the simplified Sharpe model, in the form of a univariate indicator, to analyze and make decisions rational from the point of view of natural and economic investment. This solution was applied to various portfolios, including the diversification of the species composition of tree stands. The key indicator when assessing the size of risk and related (predicted) income is the so−called the beta coefficient, determined using the modified Sharpe formula.
Źródło:
Sylwan; 2018, 162, 12; 971-979
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model ekonomicznej oceny ochrony lasu przed szkodliwymi owadami lisciozernymi
Autorzy:
Klocek, A.
Zajac, S.
Powiązania:
https://bibliotekanauki.pl/articles/815875.pdf
Data publikacji:
1999
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
zwalczanie szkodnikow
ocena ekonomiczna
foliofagi
efektywnosc
owady
szkodniki roslin
lasy
ochrona lasu
lesnictwo
Źródło:
Sylwan; 1999, 143, 04; 5-19
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:
Metody optymalizacji wieku dojrzałości rębnej drzewostanów z punktu widzenia wiązania węgla
Optimization methods of the rotation age from the point of view of carbon sequestration
Autorzy:
Wysocka-Fijorek, E.
Zając, S.
Powiązania:
https://bibliotekanauki.pl/articles/989326.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewostany
dojrzalosc rebna
okreslanie wieku dojrzalosci rebnej
optymalizacja
wiazanie wegla
rotation age
optimization methods
carbon dioxide accumulation
timber production
Opis:
The determination of the age at which a stand reaches harvest maturity is one of the most important decision−making problems in the forest management. The method of determining the rotation age depends primarily on the objectives and management practices (e.g. timber production, carbon sequestration), which determine the optimal age of trees for felling. The paper includes the methodological basis of optimization of the rotation age of stands due to the maximization of the accumulation of carbon in the aboveground woody biomass of forest trees. The research method involves two variants of calculating the optimal rotation age: grouping the stands by site class (W−1) and grouping the stands by management method (W−2). For each of the variants four data processing methods were used to optimize the rotation age of stands: allometric formulas (I−1), formulas for the calculation of the aboveground woody biomass (I−2), information on wood density (I−3), and IPCC method (I−4). The study assumes that the optimal rotation age from the point of view of maximizing the rate of carbon accumulation is when the value of increment in the average aboveground woody biomass production S(t)/(t) equals to the value of the current increment in this biomass production – ΔS. At this age, the standing volume R(t) and the volume of carbon stored in the growing stock Ww was calculated. The optimization method is analogous in all variants and approaches. The proposed method of optimizing the felling age of stands is illustrated on the example of Scots pine stands in 1 st site class (variant W−1, approach I−4). The 2014 data from the Information System of the State Forests were used for the calculations. The results (fig.) indicate that due to the maximization of the rate of carbon accumulation, the optimum rotation age for the Scots pine in 1st site class is 56 years. At that age the stand was characterized by the standing volume R(t) of about 305 m³/ha. The total carbon accumulation S(t) before this age was 85 t/ha.
Źródło:
Sylwan; 2016, 160, 09; 720-729
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prawne formy zrzeszeń prywatnych właścicieli lasów
Legal forms of associations of private forest owners
Autorzy:
Zając, S.
Gołos, P.
Geszprych, M.
Powiązania:
https://bibliotekanauki.pl/articles/1023409.pdf
Data publikacji:
2004
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
wlasciciele
lesnictwo
lasy prywatne
stowarzyszenia wlascicieli
wspolnoty wlascicieli lasow prywatnych
associations
forest communities
agricultural chambers
private forests
forest management
Opis:
The aim of the paper is to assess the benefits to the owners of private forests from joining forest associations, as well as to present the respective legal regulations in force in Poland and selected European Union countries. The examples of the countries with years−long experience (Germany, Austria, Finland and others) in forming associations of private owners show that the participation of private owners in such associations can be significantly advantageous to them. Collective management of forest resources can first and foremost serve the rational management of private forests and the seeking of measures to decrease business costs with a simultaneous increase revenues from timber sales. Poland's accession to the European Union should result in an increase of benefits to private owners due to their membership in various forms of forest associations. This mainly concerns the opportunity to obtain funds from the UE budget. The process of forming forest associations by the owners of private forests should be supported particularly by state administration and territorial units of local government. The Polish legal system does not provide too many legal forms of association to private forest owners, just two: land communities or unions assuming the form of associations. The German legal system, offering private forest owners as many as five forms of association, is more developed in this respect.
Źródło:
Sylwan; 2004, 148, 04; 40-52
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ekonomiczna efektywność naturalnego i sztucznego odnowienia drzewostanów sosnowych w Nadleśnictwie Nowa Dęba
Economic effectiveness of natural and artificial regeneration of Scots pine stands in the Nowa Deba Forest District
Autorzy:
Długosiewicz, J.
Zając, S.
Wysocka-Fijorek, E.
Powiązania:
https://bibliotekanauki.pl/articles/985715.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
gospodarka lesna
drzewostany sosnowe
odnowienia lasu
odnowienia naturalne
odnowienia sztuczne
efektywnosc ekonomiczna
ocena ekonomiczna
Nadlesnictwo Nowa Deba
scots pine
natural regeneration
artificial regeneration
costs
effectiveness assessment
Opis:
A prerequisite for effective forest management is a detailed economic analysis of given management determinants. In the forest district’s expenditures, next to the wood harvesting and skidding, the cost of silvicultural activities constitute a considerable share. The choice of forest management methods, including those for forest regeneration has a significant effect on the costs incurred for silvicultural activities as well as on the quality of emerging new generation. The aim of the study was to assess the economic effectiveness of Scots pine stand management using natural and artificial regeneration. The research determined the size and structure of expenditures incurred for the establishment and maintenance of crops. We also carried out the analysis and assessment of the effects of the selected regeneration method on forest management economic efficiency. The economic analysis included the comparison of the costs of establishment and maintenance of stands with artificially regenerated Scots pine trees with the costs of analogous activities carried out within the research plots with Scots pine from self−seeding. The studies were carried out on 4 types of forest sites, i.e.: fresh coniferous, fresh mixed coniferous, wet mixed coniferous and fresh mixed deciduous. The analyses were carried out using the cash flow method – the stream of expenditure incurred for stand management. The total costs of artificial stand regeneration and maintenance were on average higher by 1,443.24 PLN/ha of plantation as compared to naturally regenerated stands. Lower costs of tending and corrections performed in artificially regenerated Scots pine stands did not compensate for high expenditure incurred on regeneration activities, and as a result the total cost amounted to an average of 5,002.94 PLN/ha, whereas in the case of natural regeneration the total cost was 3,559.70 PLN/ha. In the analysed methods, the site conditions were of great importance to the amount of expenditures incurred for stand regeneration and maintenance. The economic viability of forest natural regeneration was confirmed for fresh coniferous, fresh mixed coniferous and wet mixed coniferous habitat types. In fresh mixed deciduous site, high costs of tending treatments and corrections had a major effect on the low economic result of the natural method of forest regeneration. The presented results on the effectiveness of management of Scots pine stands or those with the predominance of Scots pine using natural and artificial regeneration can be an important factor in taking appropriate silvicultural decisions, based on the assessment and knowledge of determinants affecting profitability of undertakings.
Źródło:
Sylwan; 2019, 163, 05; 373-384
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena działalności firm leśnych w lasach beskidzkich
Assessment of forestry contractors activities in the forests of the Beskidy Mts.
Autorzy:
Sikora, A.T.
Zając, S.
Nybakk, E.
Powiązania:
https://bibliotekanauki.pl/articles/989089.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
Beskid Slaski
Beskid Zywiecki
RDLP Katowice
firmy lesne
uslugi lesne
ocena dzialalnosci
ocena jakosciowa
ocena ilosciowa
czynniki rozwoju
bariery rozwoju
wlasciciele
badania ankietowe
entrepreneurship
forestry contractors
business condition
Opis:
The paper presents the assessment of forestry contractors activities in the opinion of their owners and analyses the influence of selected factors on the results achieved by these contractors, as well as identified significant barriers and drivers associated with the activities of forestry contractors. The study was conducted among forestry contractors who offer their services in the field of forestry in eight forest districts of Beskid Śląski and Żywiecki in the Regional Directorate of State Forests in Katowice (southern Poland) between 2004 and 2010. The study combined quantitative and qualitative research methods used in social studies. The quantitative research method was carried out on a sample of 297 respondents. The questionnaire for the study consisted of a set of prepared statements using a seven−point Likert scale. The respondents were contacted by post. Finally, the analysis included 101 opinions (34% response rate). The qualitative research method proposed open−ended questions that overlapped thematically with the quantitative part of the study. The research had a character of direct and in−depth interviews. The qualitative research was conducted on a sample of seven respondents. Owners of forestry contractors very well assessed the service activities of their businesses, which resulted from the economic conditions of forest districts. Studies showed that the decline in economic activity of customers resulted in a deterioration of the results achieved by these contractors. Among the analysed factors, only the size of the company had a significant impact on the results achieved by these contractors in terms of forest management in the examined forest districts.
Źródło:
Sylwan; 2017, 161, 06; 443-450
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 16

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