OPEN Repository

Welcome to OPEN - the Repository of Open Scientific Publications, run by the Interdisciplinary Centre for Mathematical and Computational Modelling, University of Warsaw, previously operating as the CeON Repository. The Repository enables Polish researchers from all fields to openly share their articles, books, conference materials, reports, doctoral theses, and other scientific texts.

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22799 archived items

Recent Submissions

Sample allocation decisions for program evaluation: a case of multiplicative effect on units due to the developmental initiatives carried out in a phased manner
(Instytut Badawczy Leśnictwa, 2010) Pandey, Rajiv; Indian Council of Forestry Research and Education, Dehradun, Utterakhand, India
Evaluation is primarily a measure of the effects and elaboration on the current performance of a program. It facilitates identification and choice of the ways to achieve the intended program objectives. The evaluation includes selection of samples, as well as collection and analysis of data. This paper discusses the issue of the allocation of samples for the population for which programs have been implemented in a phased manner. This needs special attention due to the temporal impact of allocations on the successive units. A method of proportional allocation has been proposed for the estimation of the sample size in different phases under the assumption that the impact of the latter phase is a multiplicative product of constant factor and the former phase.
Different views on tree interception process and its determinants
(Instytut Badawczy Leśnictwa, 2014-09) Klamerus-Iwan, Anna; Uniwersytet Rolniczy w Krakowie, Wydział Leśny, Katedra Inżynierii Leśnej
The subject of the study is the process of interception by plants defined as the process of retaining rainfall water on plant surface, counting retention by individual plant parts or the vegetation cover as the whole. In the quantitative approach, interception capability of plants may be compared to a reservoir, the capacity of which is determined mostly by the surface of plants. Among many approaches to describe interception processes, a lot of attention has been focused on research concerning the forest vegetation with reference to atmosphere – forest stand – soil balance. Hence, in the present paper interception issues are addressed in view of forest ecosystems. The emphasis is also put on the methods and results of studies carried out under laboratory conditions. . Up-to-date literature on interception is abundant. The authors tackling this issue regularly define their own variable and complex sets of terms. This paper is an attempt to review and organize knowledge presented in existing literature on the subject.
The possibilities of biologically protecting plants against diseases in nurseries, with special consideration of Oomycetes and Fusarium fungi
(Instytut Badawczy Leśnictwa, 2014-09) Okorski, Adam; Oszako, Tomasz; Nowakowska, Justyna A.; Pszczółkowska, Agnieszka; Uniwersytet Warmińsko-Mazurski w Olsztynie, Katedra Diagnostyki i Patofizjologii Roślin; Instytut Badawczy Leśnictwa, Zakład Ochrony Lasu, Sękocin Stary; Instytut Badawczy Leśnictwa, Laboratorium Biologii Molekularnej, Sękocin Stary
Achieving high quality propagative material is difficult today due to the limited number of pesticides recommended for use. Simultaneously, EU regulations on Integrated Pest Management (IPM) in forest nurseries came into a force, requiring a search for alternative plant protection methods that are safe for humans, animals and the environment. In this paper, we present the possibilities of using bio-fungicides against diseases in forest nurseries, their mechanisms of action, as well as the direction of their development (according to IPM rules). We reviewed the results achieved by different research teams presenting the possibilities and trends in combatting Oomycetes and Fusarium spp. pathogens currently having the most important economic impact.
The use of particle size distribution of soils in estimating quality of mountain forest sit
(Instytut Badawczy Leśnictwa, 2014-09) Lasota, Jarosław; Błońska, Ewa; Zwydak, Maciej; Wanic, Tomasz; Uniwersytet Rolniczy im. Hugona Kołłątaja w Krakowie, Wydział Leśny, Katedra Gleboznawstwa Leśnego
The physical and chemical properties of soil are the basic features that are used in the assessment of mountain sites. The aim of this study was to produce a simple key for classifying forest sites in mountain areas using soil particle size distribution. 200 plots (standard typological space) were selected for examination, most of which are typical of the Carpathians – being dominated by flysch rock. A few plots were located in the Sudety and Tatra Mountains, which have a different surface geology, mostly metamorphic rock and granite. The study proved that soil properties (reaction, base saturation, content of base cations, organic carbon and nitrogen) are helpful in distinguishing and assigning soils to particular site types. The particle size distribution of forest mountain sites separated into different categories in terms of productivity. These results can be used to improve the classification of forest mountain sites
The main costs of natural disasters in the Forest District of Węgierska Górka
(Instytut Badawczy Leśnictwa, 2014-09) Sikora, Adam Tomasz; Ukalska, Joanna; Instytut Badawczy Leśnictwa, Zakład Zarządzania Zasobami Leśnymi, Sękocin Stary; Szkoła Główna Gospodarstwa Wiejskiego, Wydział Zastosowań Informatyki i Matematyki, Katedra Ekonometrii i Statystyki, Zakład Biometrii
The aim of the study was to determine the impact of increased forest management due to natural disasters on particular core unit costs. We analysed the direct costs for the Forest District of Węgierska Górka in the years 2004–2010 based on information from the State Forests Information System (SFIS) database compared with selected forest districts within the Regional Directorate of State Forests in Cracow (RDSF). The forest districts were divided into two groups with two and six forest districts and confidence intervals around the mean were determined and the significance of linear regressions of the considered characteristics was tested. Additionally, the growth rate (decrease) of the unit cost was calculated. Our studies showed that natural disasters affect only certain unit costs regardless of the intensity of the forest management. The increase in unit costs resulted in economic losses in forest management. A full long-term analysis of the economic impact of natural disasters should be done, taking into account the cost of reforestation of destroyed areas which may become apparent only some years later.