Vegetation diversity of salt‐rich grasslands in <scp>S</scp>outheast <scp>E</scp>urope

Eliáš, Pavol; Sopotlieva, Desislava; Dítě, Daniel; Hájková, Petra; Apostolova, Iva; Senko, Dušan; Melečková, Zuzana; Hájek, Michal

doi:10.1111/avsc.12017

Cited by 62 publications

(42 citation statements)

References 34 publications

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“…Inland alkali grasslands are typical in continental climate, at sites with at least moderate salt concentration in the soil and dynamic changes in water regime Eliáš et al, 2013;Valkó et al, 2014). Alkali landscapes of the Pannonian biogeographical region represent the most continuous salt-affected landscape in continental Europe with an extension of more than 210,000 ha (Šefferova Stanova et al, 2008).…”

Section: G Modelmentioning

confidence: 99%

“…Alkali landscapes of the Pannonian biogeographical region represent the most continuous salt-affected landscape in continental Europe with an extension of more than 210,000 ha (Šefferova Stanova et al, 2008). These landscapes hold an extremely high habitat diversity with numerous associations which form a very complex and heterogeneous mosaic structure even at a very fine-scale (Dítě et al, 2010a;Eliáš et al, 2013;Török et al, 2012) (Appendix A).…”

Section: G Modelmentioning

confidence: 99%

“…Species pool and spatial patterns of various grassland associations are driven by two main stress factors: salt-and water stress (Eliáš et al, 2013;Török et al, 2012;Zalatnai and Körmöczi, 2004). Therefore the amount and distribution of alkali salts in the soil together with the groundwater level determine vegetation patterns through environmental filtering (Molnár and Borhidi, 2003;Szombathová et al, 2008;Valkó et al, 2014).…”

Section: G Modelmentioning

confidence: 99%

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Fine-scale vertical position as an indicator of vegetation in alkali grasslands – Case study based on remotely sensed data

Deák

Valkó²,

Alexander

et al. 2014

Flora - Morphology, Distribution, Functional Ecology of Plants

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a b s t r a c tVertical position is an important driver of vegetation zonation at multiple scales, via determining abiotic environmental parameters, such as climate, soil properties and water balance. In inland alkali landscapes, elevation is a key factor for understanding patterns of salt accumulation and water table which is therefore considered a good indicator of alkali vegetation types. Remote sensing techniques offer viable solutions for linking elevation data to vegetation patterns by providing an elevation model of extended areas. Our goal was to test the relationships between fine-scale differences in vertical position and vegetation patterns in inland alkali landscapes by vegetation data collected in the field and elevation data generated using airborne laser scanning (ALS). We studied whether vertical position influences vegetation patterns at the level of main vegetation groups (based on alliances) or even at the level of associations. Our study sites were situated in a lowland alkali landscape in Hortobágy National Park (East-Hungary). We grouped the associations into four main vegetation groups: loess grasslands, alkali steppes, open alkali swards and alkali meadows. Even though we detected a very limited range (121 cm) in the vertical position of the main vegetation groups, they were well separated by their vertical positions. At the level of associations, a more detailed elevation-based distinction was also possible in many cases. The revealed elevation-vegetation correlations show that high-resolution mapping based on ALS remote sensing techniques is an ideal solution in complex lowland areas, such as alkali landscapes. Our findings suggest that in other types of lowland landscapes, characterised by elevation differences, the applied method might hold a great potential as a supporting tool for vegetation mapping.

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Section: G Modelmentioning

confidence: 99%

Section: G Modelmentioning

confidence: 99%

Section: G Modelmentioning

confidence: 99%

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Fine-scale vertical position as an indicator of vegetation in alkali grasslands – Case study based on remotely sensed data

Deák

Valkó²,

Alexander

et al. 2014

Flora - Morphology, Distribution, Functional Ecology of Plants

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“…Alkali landscapes of the Pannonian Basin are one of the most extended semi-natural open landscapes of the European Union. They are characterized by a fine-scale mosaic of different vegetation types, including open alkali vegetation, dry steppic grasslands, tall-grass meadows, and sedge vegetation together with alkali and non-alkali marshes [21,22]. Alkali landscapes hold an extremely fine-scale mosaic of several vegetation types with similar characteristics regarding their biomass, vegetation structure and environmental conditions, thus it seems challenging to separate these classes by remote sensing.…”

Section: Introductionmentioning

confidence: 99%

Classification of Herbaceous Vegetation Using Airborne Hyperspectral Imagery

et al. 2015

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Abstract:Alkali landscapes hold an extremely fine-scale mosaic of several vegetation types, thus it seems challenging to separate these classes by remote sensing. Our aim was to test the applicability of different image classification methods of hyperspectral data in this complex situation. To reach the highest classification accuracy, we tested traditional image classifiers (maximum likelihood classifier-MLC), machine learning algorithms (support vector machine-SVM, random forest-RF) and feature extraction (minimum noise fraction (MNF)-transformation) on training datasets of different sizes. Digital images were acquired from an AISA EAGLE II hyperspectral sensor of 128 contiguous bands (400-1000 nm), a spectral sampling of 5 nm bandwidth and a ground pixel size of 1 m. For the classification, we established twenty vegetation classes based on the dominant species, canopy height, and total vegetation cover. Image classification was applied to the original and MNF (minimum noise fraction) transformed dataset with various training sample sizes between 10 and 30 pixels. In order to select the optimal number of the transformed features, we applied SVM, RF and MLC classification to 2-15 MNF transformed bands. In the case of the original bands, SVM and RF classifiers provided high accuracy irrespective of the number of the training pixels. We found that SVM and RF produced the best accuracy when using the first nine MNF transformed bands; involving further features did not increase classification accuracy. SVM and RF provided high accuracies with the transformed bands, especially in the case of the OPEN ACCESS Remote Sens. 2015, 7 2047 aggregated groups. Even MLC provided high accuracy with 30 training pixels (80.78%), but the use of a smaller training dataset (10 training pixels) significantly reduced the accuracy of classification (52.56%). Our results suggest that in alkali landscapes, the application of SVM is a feasible solution, as it provided the highest accuracies compared to RF and MLC. SVM was not sensitive in the training sample size, which makes it an adequate tool when only a limited number of training pixels are available for some classes.

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“…), Artemisia maritima (l.), Aster tripolium (l.), Inula britannica (l.), Suaeda maritima (l.) dumort., and Salicornia europaea (l.) whereas the vast majority of vegetation surrounding investigated saline lakes comprised non-halophilic species (or 'glycophytes'). the listed halophytic species are typical components of vegetation associated with wet and highly saline (i.e., Puccinellietea) or extremely saline (i.e., Salicornietea) soils in central and south-eastern europe, respectively (Piernik, 2005;eliáš et al, 2013;stevanović et al, 2016).…”

Section: Eukaryotic and Prokaryotic Diversity In Saline Transylvanianmentioning

confidence: 99%

Limnology and plankton diversity of salt lakes from Transylvanian Basin (Romania): A review

et al. 2017

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Geography, babeş-bolyai university, 5-7 clinicilor str., 400006 cluj-napoca, romania; 2 national institute of research and development for biological sciences (nirdbs), institute of biological research, 48 republicii str., 400015 cluj-napoca, romania; 3 department of Aquatic Microbial ecology, institute of Hydrobiology, biology center of the Academy of sciences of the czech republic, na sádkách 7, 370 05 České budějovice, czech republic; 4 department of Molecular biology and biotechnology, Faculty of biology and Geology, babeş-bolyai university, 5-7 clinicilor str., 400006 cluj-napoca, romania; 5 5department of taxonomy and ecology, Faculty of biology and Geology, babeş-bolyai university, 5-7 clinicilor str., 400006 cluj-napoca, romania; 6 electron Microscopy center, babeș-bolyai university, 5-7 clinicilor street, clujnapoca, romania; 7 center for systems biology, biodiversity, and bioresources, babes-bolyai university, 5-7 clinicilor str., 400006 cluj-napoca, romania *corresponding author: gheorghe.serban@ubbcluj.ro ABSTRACTin the present work, we review the current knowledge on genesis, limnology and biodiversity of salt lakes distributed around the inner contour of eastern carpathian arc (transylvanian basin, central romania). transylvanian salt lakes formed on ancient halite (nacl) deposits following natural processes or quarrying activities. Most of these lakes are located in eastern (sovata area), southern (ocna sibiului), and western (turda-cojocna) parts of the transylvanian basin, have small surfaces (0.1-4 ha), variable depths (2-100 m), are hypersaline (>10%, w/v, total salts, mainly nacl) and permanently stratified. As consequence of steady salinity/density gradient, heat entrapment below surface layer (i.e., heliothermy) develops in several transylvanian lakes. the physical and chemical water stratification is mirrored in the partition of plankton diversity. lakes with less saline (2-10% salinity) water layers appear to harbor halotolerant representatives of phyto-(e.g., marine native Picochlorum spp. and Synechococcus spp.), zoo-(e.g., Moina salina), and bacterioplankton (e.g., Actinobacteria, Verrucomicobia), whereas halophilic plankton communities (e.g., green algae Dunaliella sp., brine shrimp Artemia sp., and members of Halobacteria class) dominate in the oxic surface of hypersaline (>10% salinity) lakes. Molecular approaches (e.g., Pcr-dGGe, 16s rrnA gene-based clone libraries, and dnA metabarcoding) showed that the o 2 -depleted bottom brines of deep meromictic transylvanian lakes are inhabited by known extremely halophilic anaerobes (e.g. sulfate-reducing delta-Proteobacteria, fermenting clostridia, methanogenic and polymer-degrading archaea) in addition to representatives of uncultured/unclassified prokaryotic lineages. overall, the plankton communities thriving in saline transylvanian lakes seem to drive full biogeochemical cycling of main elements. However, the trophic interactions (i.e., food web structure and energy flow) as well as impact of human activities and predicted climate chang...

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Vegetation diversity of salt‐rich grasslands in Southeast Europe

Abstract: Methods: Two thousand four hundred and thirty-seven relev es from halophytic and sub-halophytic habitats were classified using a modified TWINSPAN. The crispness of classification was checked. DCA and CCA with climate data as explanatory variables were applied.

Cited by 62 publications

References 34 publications

Fine-scale vertical position as an indicator of vegetation in alkali grasslands – Case study based on remotely sensed data

Fine-scale vertical position as an indicator of vegetation in alkali grasslands – Case study based on remotely sensed data

Classification of Herbaceous Vegetation Using Airborne Hyperspectral Imagery

Limnology and plankton diversity of salt lakes from Transylvanian Basin (Romania): A review

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