Bogna Zawieja - Academia.edu (original) (raw)

Books by Bogna Zawieja

Folia Forestalia Polonica 2014, Vol. 56 (4) Title: Determination of lime tree (Tilia begonifolia... more Folia Forestalia Polonica 2014, Vol. 56 (4)

Title: Determination of lime tree (Tilia begonifolia Stev.) stems form based on quantitative parameters (Study area: Shafaroud forests of Guilan province, Iran)
Author(s): Mohammad Rasoul Nazari Sendi, Iraj Hassanzad Navroodi , Hassan Poorbabaei, Mohammad Sheikhkanlu Milan, Behzad Bakhshandeh
DOI: 10.2478/ffp-2014-0018

Title: Habitat preferences of royal fern Osmunda regalis L. in the ‘Baszków' nature reserve
Author(s): Anna K. Gdula, Marcin K. Dyderski, Andrzej M. Jagodziński
DOI: 10.2478/ffp-2014-0019

Title: Longitudinal analysis of annual height increment differentiation in Scots pine (Pinus sylvestris L.) stands of different age classes
Author(s): Bogna Zawieja, Katarzyna Kaźmierczak
DOI: 10.2478/ffp-2014-0020

Title: Forests and forestry in Poland and other EU countries
Author(s): Stanisław Zając, Adam Kaliszewski, Wojciech Młynarski
DOI: 10.2478/ffp-2014-0021

Title: Effect of mechanization level on manpower needs in forestry
Author(s): Urszula Błuszkowska, Tomasz Nurek
DOI: 10.2478/ffp-2014-0022

Title: Aerial treatments in forest protection – research methodology
Author(s): Robert Stefan Rowiński
DOI: 10.2478/ffp-2014-0023

Author(s): Luc E. Pâques, Jan Kowalczyk, Marek Rzońca, Adam Guziejko, Tomasz Wojda, Małgorzata K. Sułkowska

Papers by Bogna Zawieja

The study examined the significance of linear and square dependence between the increments of hei... more The study examined the significance of linear and square dependence between the increments of height, increments of lateral branches of Scots pine and both the temperature and rainfall occurring during the year preceding the year incremental. There was a significant, positive linear relationship between increments and the temperature (of the preceding year). Moreover a negative correlation of rainfall occurring in July. Similar results for the square regression were obtained. However, these relationships are very weak.

Biometrical Letters, 2015

Acta Agriculturae Scandinavica, Section B — Soil & Plant Science, 2015

The estimation of unknown parameters in a logistic model with multinomial distribution is usually... more The estimation of unknown parameters in a logistic model with multinomial distribution is usually carried out using iterative methods: the Newton-Raphson or Fisher scoring method. These methods often differ in the number of iterations, which is connected with the type of model used. In this paper these two iterative methods are compared empirically. Data from three real experiments were used for the analysis. Each experiment was described by a different logistic model. Additionally, calculations were carried out for two experiments expanded with simulated data.

African journal of agricultural research

The aim of this study is to compare the suitability of Bennett’s and Miller’s statistical methods... more The aim of this study is to compare the suitability of Bennett’s and Miller’s statistical methods, respectively, for analysis of oilseed rape varietal uniformity. In both methods, coefficient of variation for evaluation of the uniformity of crop varieties was used. In order to test the suitability of the above mentioned statistical methods for analyzing the varietal uniformity in spring oilseed rape, the quantitative trait (plant height) was used. The same plant feature is also used as the obligatory plant characteristic during the official oilseed Distinctness, Uniformity, Stability (DUS) testing before variety registration in the Research Centre for Cultivar Testing (COBORU). The results of the study demonstrated that, the Miller’s method is more restrictive (less varieties were found to be uniform in plant height) compared to the Bennett’s method.

Before registration, each new variety of crop plants, has to be tested in terms of its uniformity... more Before registration, each new variety of crop plants, has to be tested in terms of its uniformity. The decisions concerning uniformity of new varieties („candidates”) are taken for all tested characteristics, both quantitative and qualitative. In the case of qualitative characteristics, in the sample of fixed size, the number of non-typical plants is observed and if the fraction of such plants exceeds some threshold, this variety is considered as not fulfilling the condition of uniformity. In the case of quantitative characteristics the procedure is more complicated. The standard deviation of the candidate variety and average of standard deviations of registered varieties (sown in the same trial) is compared. The officially recommended method, in countries associated in UPOV organization, is so called the COYU procedure. This method is computationally complicated. Study of the homogeneity of variation coefficients is a much easier method, then the Bennett’s method can be used. A new...

Uniformity of new varieties are usually checked using COYU approach after collecting re-sults of ... more Uniformity of new varieties are usually checked using COYU approach after collecting re-sults of three years of trials. There are some other possibilities of testing uniformity as indicated in a papers by Zawieja and Pilarczyk (2005, 2006). In this paper the discrepancies between the deci-sions concerning uniformity of rye varieties taken with the support of two methods (COYU and Bennett's test) are compared. The influence of degree of correlation between levels of expression of characteristics (mean values) and transformed standard deviations on the decisions concerning uniformity is investigated.

Biometrical Letters, 2012

One of the most important characteristics in determining the dendrometrical properties of a stand... more One of the most important characteristics in determining the dendrometrical properties of a stand is the annual height increment of the trees. On the basis of these increments, natural phases of the trees' life are defined. In the present study the data concern the height increments of the main trunk of 25-year-old Scots pine, as well as simulated data. Our research deals with the application of longitudinal data analysis. This analysis is usually used when measurements are taken at the same treatments at different time points. The calculations performed provide answers to the question of which annual height increments differ.

Russian Journal of Genetics, 2012

In this paper interest is focused on uniformity of individual mutants. Because before the registr... more In this paper interest is focused on uniformity of individual mutants. Because before the registra tion of a new variety the criteria for DUS (distinctness, uniformity and stability) are checked, so you should also check whether the mutant meets them. The aim of created mutants, in many genetic experiments, is to expand variation of the initial material. This is achieved through use of the mutagen or combination of mutagens on different stages of plants growth. The experimenter should choose some of obtained mutants (for example these which showed better property as regards the same trait). Calculations were done on the basis of results of test with variety Krab of the Lathyrus sativus L. (grasspea) species and 17 mutants getting from this variety. Uniformity was checked with the use of the Bennett's method which is based on testing of equality of coefficients of variation. After analysis the mutants with codes K3, K37, K63, and K64 were detected as uniform at the same level as variety Krab.

Biometrical Letters, 2014

Annual height increments are a very important characteristic of Scots pine. They have a direct ef... more Annual height increments are a very important characteristic of Scots pine. They have a direct effect on the determination of the dendrometric properties of a stand, such as volume increment. In the present study the data concern height increments of the main shoot in selected age classes of trees (age 72 to 92 years). A relationship is determined between the values of the increments and meteorological conditions such as temperature, precipitation and sunshine. On the basis of lasso regression analysis, precipitation in the year preceding the incremental season was shown to have the greatest effect on height increments of Scots pine.

Folia Forestalia Polonica, 2014

In the study, the measurements of Scots pine height increments were used to compare the increment... more In the study, the measurements of Scots pine height increments were used to compare the increments of pine trees of different age classes. All of the analyzed trees were growing in stands located on fresh mixed coniferous forest sites. The study concerned a 10-year period of growth of 8 tree age classes. Due to variation in climate conditions, all trees were studied over the same calendar period. Longitudinal analysis was used to compare different age classes of trees with reference to the increments in height. This procedure had not been previously used for such purpose. The results obtained did not confirm the hypothesis of parallel profiles implying that there existed differences in the growth of trees in various age groups.