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Field maple (Acer campestre L.) is naturally distributed in most of Europe, with the exception of its northern parts. Field maple can serve as a valuable model for researching the sensitivity of its populations to habitat fragmentation, considering the lack of silvicultural treatments in its stands. The research aims to determine the interpopulation and intrapopulation variability of field maple populations from Bosnia and Herzegovina in the nursery test. The authors researched measured root collar diameter, height, observed forkness and calculated slenderness coefficient of the one-year-old generative material from 18 Bosnian-Herzegovinian populations of field maple, produced in the nursery of Žepče. The descriptive statistics and variance analysis was performed. All analyzed traits showed a high degree of intrapopulation as well as interpopulation variability, as confirmed by the analysis of variance. The highest average height was found in the provenance Bosanski Brod (46.08 cm) and the smallest in Bosanska Dubica (19.11 cm). Kreševo provenance had the highest average root neck diameter (8.27 mm) and Bosanska Dubica (5.24 mm) the lowest. A very low percentage of forkness (6.86%) was determined, and the values of the slenderness coefficient were acceptable for all provenances. The results indicate the need for further systematic research on this ecologically valuable species. [ABSTRACT FROM AUTHOR]

Given finitely many events in a probability space, conditional independences among the indicators of events are considered simultaneously with the signs of covariances. Resulting discrete structures are studied restricting attention mostly to all couples and triples of events. Necessary and sufficient conditions for such structures to be represented by events are found. Consequences of the results for the patterns of conjunctive forks are discussed. [ABSTRACT FROM AUTHOR]