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Dive into the research topics where Jiří Kolbek is active.

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Featured researches published by Jiří Kolbek.


Plant Ecology | 2010

Can campo rupestre vegetation be floristically delimited based on vascular plant genera

Ruy José Válka Alves; Jiří Kolbek

A number of floristic and vegetation studies apply the terms campo rupestre, campo de altitude (or Brazilian páramo), and Tepui to neotropical azonal outcrop and montane vegetation. All of these are known to harbor considerable numbers of endemic plant species and to share several genera. In order to determine whether currently known combinations of vascular plant genera could help circumscribe and distinguish these vegetation types, we selected 25 floras which did not exclude herbs and compiled them into a single database. We then compared the Sørensen similarities of the genus–assemblages using the numbers of native species in the resulting 1945 genera by multivariate analysis. We found that the circumscription of campo rupestre and other Neotropical outcrop vegetation types may not rely exclusively on a combination of genera.


Check List | 2009

Summit vascular flora of Serra de São José, Minas Gerais, Brazil

Ruy José Válka Alves; Jiří Kolbek

The campos rupestres form a mosaic of rocky savannas concentrated mainly along the Espinhaco chain, on the Brazilian shield. Though the Serra de Sao Jose lies over 100 km to the south of the Espinhaco chain, the campo rupestre flora of this small range harbors several endemic plant taxa. The provided checklist is the result of two decades of floristic research complemented with data from herbaria and literature. The flora is compared with the results of several other pertinent surveys. A total of 1,144 vascular plant species, representing 50.3 species/km2, were documented to date in the Sao Jose range, representing a species-richness per unit area over five times greater than other known campo rupestre floras. The most species-rich families were the Asteraceae (126 species), Orchidaceae (106), Melastomataceae (63), Leguminosae (60), Cyperaceae (45), Poaceae (41), Rubiaceae (37), Myrtaceae (28), Bromeliaceae (27), Eriocaulaceae (23), Lamiaceae (23), and Malpighiaceae (22).


Ecological Research | 1994

Vegetation structure along the altitudinal gradient at the treeline of Mount Paektu, North Korea

Miroslav Šrůtek; Jiří Kolbek

Vegetation structure of the treeline was studied on the southeastern slope of Mount Paektu (North Korea). Fifteen temporary plots (20m×20m) were situated along the altitudinal transect. Seven square samples (phytosociological relevés 5 m×5 m) were analyzed in each plot. Although the character of the vegetation was rather continuous altitudinally, five similar groups of vegetation samples were distinguished by the TWINSPAN procedure. The distribution of samples in the classification showed not only the effect of altitude but also the effect of competition between the tree and the shrub layers and other factors. In the canonical correspondence analysis (CCA) ordination several environmental variables were used (such as altitude of each plot, distance of each plot from the forest edge and the cover percentage of tree, shrub, herb and moss/lichen layers). The variable ‘cover of tree layer’ had the strongest relation to the species data. Continuous changes of species richness along the altitude were confirmed. Species richness decreased significantly with altitude.


Archive | 2003

Forest Vegetation of the Northern Korean Peninsula

Jiří Kolbek; Ivan Jarolímek; Milan Valachovič

North Korean forest and shrub vegetation data were obtained during several expeditions in 1984–1990. Field analyses were carried out using Braun-Blanquet methods. The resulting data-set of 244 phytocoenological releves was processed by numerical techniques. Soil analyses were done for most vegetation types. Seven associations were distinguished in coniferous forests, including Rhododendro aurei-Laricetum olgensis, Goodyero repentis-Piceetum jezoensis, Carici peiktusani-Abietetum nephrolepidis, Ledo decumbentis-Laricetum olgensis, Polysticho retroso-paleacei-Rhododendretum dahurici, Taxo-Pinetum pumilae, and Thujo koraiensis-Piceetum jezoensis; 15 subassociations were described new. The following communities were found in semi-deciduous and deciduous forests: Lychno-Quercetum mongolicae, Vaccinio-Quercetum mongolicae, Parthenocisso tricuspidati-Fraxinetum rhynchophyllae, Festuco ovinae-Pinetum densiflorae, Saso-Quercetum mongolicae, Artemisio-Quercetum mongolicae, Syneilesio palmatae-Carpinetum laxiflorae, Lilio lancifolii-Rhododendretum schlippenbachii, and Indigofera kirilowii-Securinega suffruticosa community. Nine subassociations were newly described. Three new alliances were defined, a Laricion olgensis for coniferous forests of North Korea, a Rhododendro dahurici-Acerion barbinervi for shrub and mantle communities, and a Weigelo floridae-Fagarion schinifoliae for shrub vegetation. Zonation of forest vegetation in North Korea is briefly characterized.


Biologia | 2006

Habitat requirements of Cardaminopsis petraea — Rare and relict species of the Czech Republic

Tomáš Černý; Petr Petřík; Karel Boublík; Jiří Kolbek

Vegetation with Cardaminopsis petraea was sampled by phytosociological relevés at almost all the known Czech sites, and characterized by indicator values, influence of potential direct solar irradiation, and bedrock type with the aid of multivariate methods. It has been declared that C. petraea prefers open natural or seminatural drier to mesophilous habitats without some preference to the bedrock. It occupies habitats with various slopes, but it prefers more extreme slants and northerly exposed slopes. The classification and ordination methods showed clear distinction between Moravian and Bohemian habitats. Apart from other types, in Bohemia this species occurs uniquely in acidophilous rock communities, whereas in Moravia it grows uniquely within calcareous grasslands. Relictness of the species was discussed in relation to the specific site conditions (light supply, disturbance regime, and geographical isolation) and to the occurrence of other rare taxa and habitats. Occurrence on some man-made habitats was also observed.


Archive | 2003

Comparison of Forest Syntaxa and Types in Northeast Asia

Jiří Kolbek; Milan Valachovič; Nikolai Ermakov; Zdenka Neuhäuslová

Forest vegetation of northeastern Asia was studied, in particular in easternmost Russia, northeastern China, North Korea and northern Japan. Forest communities belonging to following classes have been differentiated: Vaccinio-Piceetea, Betulo ermanii-Ranunculetea japonici, Querco-Fagetea crenatae, Querco mongo-licae-Betuletea davuricae, Populetea laurifolio-suaveolentis, and Salicetea sachalinensis. Within of these classes, a total of 20 orders, 45 alliances, 174 associations, and 103 units without rank (communities, forest types, formations etc.) were also distinguished. The survey of syntaxa represents a first attempt towards consolidation of classification of forest vegetation in northeastern Asia and is therefore only preliminary.


Biologia | 2006

Plant communities dominated by Salix gracilistyla in Korean Peninsula and Japan

Ivan Jarolímek; Jiří Kolbek

Riverside vegetation dominated by Salix gracilistyla was analysed. In total, 77 phytocoenological relevés from Japan and both Korean Republics were compared. Based on 20 own relevés from Kumgang-san Mts (North Korea) a new association Artemisio feddei-Salicetum gracilistylae was described. It occupies alluvia of rivers and streams flooded for several times yearly. This species-rich community differs from the most similar, but species-poor association Salicetum gracilistylae Minamikawa 1963, described from Japan and known also from South Korea by numerous differential taxa.


Archive | 2003

Vegetation-environment Relationships within and among Selected Natural Forests in North Korea

Miroslav Šrůtek; Jiří Kolbek; Ivan Jarolímek; Milan Valachovič

The set of 234 forest vegetation samples from North Korean forests was subdivided into two homogenous groups, i.e. coniferous forests, and broad-leaved and mixed forests. The indirect (i.e. the detrended correspondence analysis, DCA) and direct (i.e. canonical correspondence analysis, CCA) gradient analyses were used to recognize relationships between forest communities and several environmental variables (mean annual precipitation, slope orientation and inclination, altitude, cover of particular forest strata, mean annual Kira’s warmth (WI) and coldness (CI) indices). Although relatively little variation in species composition is explained by the indirect ordination, environmental gradients were recognizable in both mountain coniferous forests and mixed pine-oak forests. Altitude and precipitation, and their interdependence, seem to be good predictors of forest composition, particularly in the mountain coniferous forests. In fact, these variables generally are the most important factors affecting species distribution and vegetation zonation along environmental gradients. Nevertheless, understanding the ecology of these forest ecosystems will not be complete without investigation of the effects of other biotic and abiotic factors, such as latitude, distance from the sea, air humidity, prevailing wind direction, temperature, light intensity, evapotranspiration, soil features and various kinds of natural and human-caused disturbances. This is an area for future research in the region. The change in species diversity (Hill’s index) did not show any distinct pattern in relation to any environmental gradient. This is true across the whole data set and within the two main forest types.


Biologia | 2010

Phragmitetum japonicae in Korean Peninsula and Japan

Jiří Kolbek; Ivan Jarolímek

Plant communities dominated by Phragmites japonica and described as Phragmitetum japonicae Minamikawa 1963 were studied in northern part of the Korean Peninsula. 40 sampled relevés were compared with similar vegetation in South Korea and Japan. In total 118 phytocoenological relevés were synthesized. Three subassociations (artemisietosum feddei, boehmerietosum spicatae and inops) were described as new. Two subassociations (humuletosum scandentis and polygonetosum thunbergii) described from Japan were found also in Korea. The problems of classification of this heterogeneous and species-poor vegetation unit were discussed.


Plant Biosystems | 2011

Vegetation with Gagea bohemica in the landscape context

Tomáš Černý; Petr Petřík; Karel Boublík; Jiří Kolbek; M. Adámek

Abstract Most localities of the critically endangered species Gagea bohemica (early star-of-Bethlehem) known in the Czech Republic were surveyed using the Braun-Blanquet approach. Based on formal definitions of the expert system for Czech non-forest vegetation, 69% of the 255 samples analysed were classified as already described pioneer plant communities on shallow soils. Samples unsorted by the expert system exhibit local or transient species composition. Ordination and multiple linear regression methods were used to study the effects of adjacent habitats and environmental conditions (altitude, Direct Potential Annual Radiation Index, herb layer cover and landcover) on species richness, the cover of G. bohemica, and the cover of nitrophytes. The geographical component (i.e. two distribution centres: one in Bohemia and one in Moravia) explained more variability in species composition than local environmental conditions or the effect of adjacent habitats. The local species pool significantly enriched the species composition of plots close to artificial and non-forested areas, less so in species-poor forested areas. However, close to areas transformed by humans, the vegetation was invaded by numerous ruderal species. The low variability in species composition of one of the most species-poor grassland communities in the Czech Republic could be associated with the relic character of its habitats. The different impacts of landscape structure on habitat diversity in Bohemia and Moravia may be a result of contrasting historical processes acting in different parts of the Czech landscape.

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Zdenka Neuhäuslová

Academy of Sciences of the Czech Republic

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Jiří Sádlo

Academy of Sciences of the Czech Republic

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Jaroslav Moravec

Academy of Sciences of the Czech Republic

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Kamil Rybníček

Academy of Sciences of the Czech Republic

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Karel Boublík

Czech University of Life Sciences Prague

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Miroslav Šrůtek

Academy of Sciences of the Czech Republic

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Petr Petřík

Academy of Sciences of the Czech Republic

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Ivan Jarolímek

Slovak Academy of Sciences

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Milan Valachovič

Slovak Academy of Sciences

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