Karol Ujházy

Karol Ujházy
Technical University in Zvolen · Department of Phytology

PhD

About

86
Publications
33,366
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1,270
Citations
Additional affiliations
September 1993 - present
Technical University in Zvolen
Position
  • Professor (Associate)

Publications

Publications (86)
Article
Full-text available
Diversity of beech forest vegetation in the Eastern Alps, Bohemian Massif and the Western Carpathians. – Preslia 88: 435–457. This study compares species composition, local species richness, beta diversity and species pool of beech-dominated forests in three main mountain systems in central Europe. We used a recently compiled representative data se...
Article
Full-text available
Aims and study area: We present the first formalised large-scale syntaxonomic overview of mesic semi-natural grassland communities (Arrhenatheretalia elatioris and Nardetalia strictae) in the Ukrainian part of the Eastern Carpathians and adjacent areas of Hungary, Slovakia and Poland. Methods: During 2009–2014 we recorded 759 phytosociological rele...
Article
Full-text available
Aims: To produce a phytosociological synthesis of acidophilous beech forests in Slovakia and to assess their main environmental gradients. Location: Slovakia. Methods: Cluster analysis (Beta flexible linkage method and Bray-Curtis distance as a dissimilarity measure) was used to find the main vegetation types, whereas detrended correspondence analy...
Article
Full-text available
The unimodal species richness-altitude distribution pattern seems to be universal. To investigate the validity of this phenomenon in homogeneous substrate and vegetation conditions, we sampled beech-dominated forests in five volcanic mountain ranges in the Western Carpathians. European beech (Fagus sylvatica L.) formed monodominant closed-canopy st...
Article
Questions: (a) What are the rates and directions of vegetation succession in an inland sand-dune system? (b) What are the differences in successional trajectories in different relief types? and (c) Is it possible to preserve the last areas of still active dunes and under what circumstances? Location: The study sites were located in the northern par...
Article
Development of primary spruce forests is driven by a series of disturbances, which also have an important influence on the understorey vegetation and its diversity. Early post-disturbance processes have been intensively studied, however, very little is known about the long-term effects of disturbances on the understorey. We quantified disturbance h...
Article
Full-text available
Research in global change ecology relies heavily on global climatic grids derived from estimates of air temperature in open areas at around 2 m above the ground. These climatic grids do not reflect conditions below vegetation canopies and near the ground surface, where critical ecosystem functions occur and most terrestrial species reside. Here, we...
Book
Full-text available
The great book of plants, rocks, minerals and fossils is a unique, richly illustrated work, which in a comprehensive form gives an image of the flora of the whole of Central Europe. The updated texts present in an engaging way information on the life, reproduction, distribution, occurrence of plants and their importance for humans, as well as data...
Article
A complete syntaxonomical revision of beech, fir and mixed montane forest communities within the order Fagetalia sylvaticae was realised for the first time in Slovakia.We used all available phytosociological material and selected 3355 relevés according to the dominance of Fagus sylvatica, Abies alba and/or Acer pseudoplatanus in the tree layer. The...
Article
Full-text available
There are not many sites in densely populated temperate Europe where primary forest succession has a chance to run without direct human intervention for a long time and over a relatively large area. The extensive drift sand area of the Veluwe, central Netherlands, provided an opportunity to study succession in a formerly open and dynamic inland san...
Article
Full-text available
The aim of this work was to identify compositional changes in the plant communities of Fageto-Quercetum group of forest types over the course of several decades. The research was based on resurveying of 146 typological representative plots on andesite bedrock of the region. Evaluation of data using statistical methods documented, quantified and par...
Preprint
Full-text available
Research in environmental science relies heavily on global climatic grids derived from estimates of air temperature at around 2 meter above ground1-3. These climatic grids however fail to reflect conditions near and below the soil surface, where critical ecosystem functions such as soil carbon storage are controlled and most biodiversity resides4-8...
Article
Natural disturbances are key factors in the formation of forest ecosystem structure. Evaluation of the spatial and temporal extent of disturbance regimes is critical for understanding forest dynamics, forest structural hetero-geneity, and biodiversity habitats. Quantifying disturbance regimes is therefore imperative for appropriate management of fo...
Article
Questions Light availability at the forest floor affects many forest ecosystem processes, and is often quantified indirectly through easy‐to‐measure stand characteristics. We investigated how three such characteristics, basal area, canopy cover and canopy closure, were related to each other in structurally complex mixed forests. We also asked how w...
Article
Questions Long‐term legacies of historical human activities in temperate forests are increasingly recognised as an important driver of vegetation diversity and composition. To uncover centuries old legacies, novel approaches are, however, needed. Here, we combine anthracology of historical charcoal kilns and long‐term vegetation resurveys. We asked...
Article
Estimates of historical disturbance patterns are essential to guide forest management aimed at ensuring the sustainability of ecosystem functions and biodiversity. However, quantitative estimates of various disturbance characteristics required in management applications are rare in longer‐term historical studies. Thus, our objectives were to: (1) q...
Article
Full-text available
Fossorial rodents are recognized as diversity drivers in grassland ecosystems and are therefore considered ecosystem engineers and keystone species. However, there is a lack of evidence regarding this function for species in temperate grasslands, especially one of the most threatened, the European ground squirrel. We examined the effect of the Euro...
Article
Full-text available
The aim of the study was to perform phytosociological revision of the scree and ravine forest vegetation in Slovakia in order to identify i) basic vegetation units according to their floristic composition, and ii) to find out the main environmental gradients affecting their compositional variability. Relevés originally assigned to broadly comprehen...
Article
1.A central challenge of today's ecological research is predicting how ecosystems will develop under future global change. Accurate predictions are complicated by (i) simultaneous effects of different drivers, such as climate change, nitrogen deposition, and management changes; and (ii) legacy effects from previous land use. 2.We tested whether he...
Article
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Our article brings new occurrence data of 34 alien vascular plants in the territory of central Slovakia. Four of them, Caucalis platycarpos, Hibiscus trionum, Kickxia elatine and Xanthium strumarium are included in the recent Red list of vascular plants of Slovakia. Distribution data about Erechtites hieraciifolius shows its strong spreading in the...
Article
We aimed to identify how the alkaline dust fallout from magnesite factories (Slovenské rudohorie Mts, Western Carpathians) affects biodiversity and species composition of oak-hornbeam forests, and to compare sensitivity of local biodiversity represented by vascular plants (including flowering plants and ferns) and cryptogams (cyanobacteria, macromy...
Article
Given the global intensification of forest management and climate change, protecting and studying forests that develop free of direct human intervention-also known as primary forests-are becoming increasingly important. Yet, most countries still lack data regarding primary forest distribution. Previous studies have tested remote sensing approaches...
Article
Full-text available
Cololejeunea rossettiana, Fossombronia foveolata, Marsupella sprucei, Brachythecium geheebii, Buxbaumia viridis, Callicladium haldanianum, Dicranum viride, Hookeria lucens, Hygrohypnum polare, Orthotrichum rogeri, Oxystegus tenuirostris, Platydictya jungermannioides, Pterygoneurum lamellatum, Pyramidula tetragona, Sphagnum affine, Splachnum ampulla...
Article
Full-text available
Our study brings new information about occurrence of 29 endangered vascular plants from the territory of central Slovakia. Species findings were recorded in the years 2017 and 2018. The annotated list comprises one regionally extinct (RE), one critically endangered (CR), two endangered (EN), five vulnerable (VU) and 20 near threatened (NT) plant sp...
Article
Aim Revisits of non‐permanent, relocatable plots first surveyed several decades ago offer a direct way to observe vegetation change and form a unique and increasingly used source of information for global change research. Despite the important insights that can be obtained from resurveying these quasi‐permanent vegetation plots, their use is prone...
Article
Full-text available
The effect of forest management on biodiversity is a crucial issue for sustainable forestry and nature conservation. However, the ways in which management affects macrofungal and plant communities and diversity of mountain temperate forests still remain poorly understood. We performed a random sampling stratified by stand age and stand type on the...
Article
Full-text available
Changes of the above-ground vegetation and soil the seed bank were studied in a secondary oligo-trophic montane grassland after abandonment and gradual colonisation by Norway spruce. The main aim was to compare the responses of the above-and below-ground species composition and richness as well as seed density to successional development. Next aim...
Article
Disturbances are important natural factors affecting biological diversity, community composition, and ecosystem structure. The European ground squirrel is a semi-fossorial organism, and through disturbances caused by burrowing activities, it can play an important role as an ecosystem engineer of grasslands in central and south-eastern Europe. The a...
Poster
Full-text available
Classification of montane beech dominated forests on the base-rich bedrock in the Western Carpathians is still unclear. Eutrophic communities of high altitudes used to be classified within the Acerenion suballiance, and calciphilous communities within the Cephalanthero-Fagenion suballiance of the Fagion alliance. Recent broad-European vegetation sy...
Conference Paper
Full-text available
Central European semi-natural grasslands evolved during the last millenia thanks to grazing of domestic animals, like cattle, sheep, goats or horses. Not only the pastures but also hay meadows have usually been regularly grazed during certain period of the year until the first half of the 20th century. Grazing domestic animals not only forced the g...
Article
Forest management is widely considered to have an impact on the understorey plant diversity, which is essential for sustainable forestry and nature conservation. However, contradictions among previous large-scale studies and meta-analyses raised the need for better-designed research. Such research should identify drivers controlling diversity and s...
Article
Full-text available
The article summarizes new information on the occurrence of 142 vascular plant taxa (including four hybrids) infrequent in the Veľká Fatra Mts. Among them 101 are autochthonous and 39 allochthonous to the flora of Slovakia, while origin of two taxa remains unclear. We recorded new sites of one endangered (EN: Utricularia minor) and three vulnerable...
Article
Full-text available
More and more ecologists have started to resurvey communities sampled in earlier decades to determine long-term shifts in community composition and infer the likely drivers of the ecological changes observed. However, to assess the relative importance of and interactions among multiple drivers, joint analyses of resurvey data from many regions span...
Article
Full-text available
Floristic research of selected sites in the vicinity of the town of Zvolen (south-east part of the Kremnické vrchy Mts., central Slovakia) was realized during the years 2013–2016 focusing on data updating after about 70 years. Altogether 523 taxa of vascular plants were found. Among the recent interesting floristic records belong the following enda...
Article
Full-text available
Study of acidophilous beech forest vegetation in Slovakia was realised in the last years using representative data-set and adequate numerical methods with the main aims: i) to characterise floristic variability and classify plant communities of the acidophilous beech forests and ii) to detect environmental gradients, which affect variation in their...
Article
Full-text available
The present study brings the data on the current occurrence of endangered vascular plants from the territory of central Slovakia obtained during the years 2011–2016. Some aspects of their distribution within the studied area and/or wider geographical context on country level, ecology and vegetation characteristics are discussed. The annotated list...
Article
Full-text available
Lesné spoločenstvá zväzu Tilio-Acerion s dominanciou buka lesného (Fagus sylvatica) na karbonátoch Malých Karpát Forest communities of the alliance Tilio-Acerion with the dominance of common beech (Fagus sylvatica) on carbonate bedrock of the Malé Karpaty Mts 2 Katedra aplikovanej ekológie, Fakulta ekológie a environmentalistiky, Technická univerzi...
Conference Paper
Full-text available
Plant communities of primary and secondary forests with natural or changed tree-species composition are usually compared using parallel plots in mature stands. However, such stands cover only a minor area in the complexes of commercial forests. Real effect of forest management on the species diversity should be, therefore, studied with respect to t...
Research
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The monograph, presenting the methods, data and results of the forest permanent plots resampling
Article
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Aims Woody invasions into grasslands have increased globally due to changing land use, climate and introduced woody species, but spatial processes generating and sustaining these invasions are not well understood. To gain insight into the patterns of spread of tree populations within grasslands, and to propose a full spatial analytical toolbox for...
Article
Full-text available
We provide an inventory of the sites and vegetation types in the Czech Republic and Slovakia that contain the highest numbers of vascular plant species in small areas of up to 625 m2. The highest numbers of species were recorded in semi-natural grasslands, in which we report four new world records for fine-scale species richness: 17 species of vasc...
Poster
This study compares species composition, local species richness, beta diversity and species pool of beech-dominated forests in three main mountain systems in central Europe.We used a recently compiled representative data set of 5946 vegetation plots recorded in the Eastern Alps, Bohemian Massif and Western Carpathians. Effects of bedrock type, regi...
Article
Full-text available
The paper deals with syntaxonomical classification of acidophilous beech-forest communities in the Bystričská and Prieslopská dolina Valley located in the southern part of Lúčanská Fatra Mts. Forests dominated by Common beech (Fagus sylvatica) with the admixture of Silver fir (Abies alba) or Norway spruce (Picea abies) were studied. During 2012–201...
Book
Full-text available
The fifth volume of the edition of Plant communities of Slovakia summarizes the results of the syntaxonomical revision of dry grasslands (Festuco-Brometea), fringe communities (Trifolio- Geranietea), lowland and mountain hay meadows and pastures (Molinio-Arrhenatheretea, Nardo-Agrostion tenuis, Violion caninae), acidophilous heathlands (Calluno-Uli...
Article
Full-text available
Natural montane fir-beech forests are frequently replaced by spruce plantations in Central Europe. Significant impact on understorey species diversity is expected. However, mechanisms of dominant tree influence on the understorey have not been completely revealed yet. The aim of the study is to determine changes of herb layer composition and divers...
Article
Changes of soil microbial community caused by the heterogeneity of abiotic and biotic environment were studied in the reserve Dobroč, Slovakia. Data on vegetation, microclimate, soil properties and microbial activity were collected on two linear transects crossing both the core of the reserve and the buffer zone.In contrast to expectations, the var...
Chapter
The effect of tree species on herbs in forest understory was studied in the Dobročský prales National Nature Reserve in the Western Carpathians, as well as neighboring secondary stands at the same site. Herb species occurrence and dendrometric values were recorded on belt transects and analyzed by direct gradient analysis (RDA). The results of a pe...
Article
Full-text available
This paper focuses on ecological requirements and phytosociological affinity of Avenula adsurgens subsp. adsurgens. Although this grass is widely distributed in central and south-eastern Europe reaching dominance in certain grassland types, the knowledge on its ecology and coenology is very poor. More-over, some of the published data on its distrib...
Article
Full-text available
Beech dominated mixed mountain forests were studied in the limestone and quartzite bedrock of the Malá Fatra Mts, Slovakia. 77 phytosociological reléves were sampled, coordinates measured by GPS device, stored to the electronic database (TURBOVEG) and processed in JUICE program. Natural forest communities occupy 4th and 6th altitudinal vegetation z...
Article
The aim of the study was to differentiate calcicolous beech forests within beech-dominated forest communities using a formalised approach and to compare classifications obtained by commonly used methods (approaches). Relevés with beech dominance (cover > 25 %) were extracted from the Slovak national database and 951 relevés were selected within the...
Article
Full-text available
Planting of spruce on the sites of natural beech forests is very common across Europe. Its effect on ground vegetation is assumed to be strong on poorly buffered soils. We investigate associated patterns of herb layer composition and diversity on crystalline and carbonate parent rock in the Western Carpathians. We analysed a series of vegetation pl...
Chapter
Full-text available
Floristic variability of Slovak beech-forest communities is described in the chapter,using syntaxonomical system of the Zürich-Montpellier phytosociological school. Theoriginal differentiation on the alliance and suballiance level was realised according tothe data from the Slovak National Vegetation Database (SNVD), which has been completedrecently...
Article
Full-text available
The beech and scree forest communities were studied in the southern part of the Muránska planina Mts in 2007–2009. Data set of 132 phytosociological relevés was analysed using numerical classification and ordination. Eight associations within four suballiances were distinguished and characterised: Scolopendrio-Fraxinetum (var. typicum and var. with...
Article
Full-text available
The impact of secondary succession of grassland communities towards a Norway spruce forest on soil microbial community was studied on a belt transect established in the Pol’ana Mts., Central Europe. Data on understory vegetation, light availability, soil properties and microbial activity were collected on 147 plots distributed over regular grid. Mo...
Article
Full-text available
Several new and interesting data were gathered during the field research on the territory of the Muránska planina Mts and adjacent part of the Slovenské rudohorie Mts and Horehronské podolie Basin (central Slovakia) conducted from 2001 to 2008. The occurrence and distribution of rare and endangered taxa in the forest vegetation units, as well as di...
Article
Full-text available
Dobročský prales virgin forest lies in Central Slovakia on the northern slopes of the crystalline Veporské vrchy Mts at an altitude of about 900 ma.s.l. In 2002, we established a series of 14 plots of 400 m2 to cover the three basic developmental stages of the climax fir-beech forest community. Dendrometric measurements were carried out in the plot...
Article
Full-text available
Although changes in land-use, climate, and the spread of introduced tree species have increased the global importance of tree invasions into grasslands, our ability to predict any particular invasion is limited. To elucidate mechanisms driving tree invasions of grasslands, we studied in detail how seed dispersal and fine-scale environment control t...
Article
Full-text available
Research on coenology and interspecific affinity of rare and endangered species Orchis spitzelii was carried out during the vegetation period of 2005 and 2006 on the single Slovak locality in the Malá Fatra Mts. Orchis spitzelii belongs to the species with typical disjunctive distribution in Europe, North Africa and Western Asia with a broad coenol...
Book
Full-text available
Krajinná ekológia je multidisciplinárna vedná disciplína ktorá v súčasnom svete čeliacom hrozbám spojeným s klimatickými zmenami, nadmernej exploatácii prírodných zdrojov, a exponenciálnemu rastu ľudskej populácie nadobúda čoraz väčší význam. Procesy a zmeny v krajine sú výsledkom komplexného pôsobenia mnohých faktorov prírodných aj anropogénnych....