24 results on '"Zimmermann, Zita"'
Search Results
2. How plot shape and spatial arrangement affect plant species richness counts: implications for sampling design and rarefaction analyses
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Güler, Behlül, Jentsch, Anke, Apostolova, Iva, Bartha, Sándor, Bloor, Juliette M.G., Campetella, Giandiego, Canullo, Roberto, Házi, Judit, Kreyling, Jürgen, Pottier, Julien, Szabó, Gábor, Terziyska, Tsvetelina, Uğurlu, Emin, Wellstein, Camilla, Zimmermann, Zita, and Dengler, Jürgen
- Published
- 2016
3. Impact of mid-successional dominant species on the diversity and progress of succession in regenerating temperate grasslands
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Bartha, Sándor, Szentes, Szilárd, Horváth, András, Házi, Judit, Zimmermann, Zita, Molnár, Csaba, Dancza, István, Margóczi, Katalin, Pál, Róbert W., Purger, Dragica, Schmidt, Dávid, Óvári, Miklós, Komoly, Cecília, Sutyinszki, Zsuzsanna, Szabó, Gábor, Csathó, András István, Juhász, Melinda, Penksza, Károly, and Molnár, Zsolt
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- 2014
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4. An example of fast old field succession in a traditionally managed rural landscape on the Slovenian Karst
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Čarni Andraž, Zimmermann Zita, Juvan Nina, Paušič Andrej, Szabó Gábor, and Bartha Sándor
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grassland restoration ,QL1-991 ,QK1-989 ,land use legacy ,spatial heterogeneity ,target species ,Botany ,ex-arable land ,secondary succession ,mowing ,species pool ,Zoology - Abstract
We report an exceptionally fast grassland recovery process from a karst plateau in SW Slovenia. Vegetation of old fields with different ages was sampled using a chronosequence of fields abandoned 1, 3, 6, 9, 13, 15 and 100 years ago. We prepared dendrogram dividing the data set into 9 clusters that were further analyzed: diagnostic species, ecological conditions and life forms were evaluated. The initial stage of succession was characterized by segetal weeds and indicated high levels of soil nutrients. The second stage was dominated by dense patches of perennial forbs (most of them ruderal species) preferring also high levels of soil nutrients. The third stage was dominated by caespitose hemicryptophyte grasses, many of them of sub-Mediterranean origin. The first two stages took 13 years and both could be considered as early successional stages developing on nutrient rich soils. These stages were switched to late successional stage characterized by seminatural grassland species. The quick succession can probably be attributed to the rich species pool of natural grassland flora, the small size and annual mowing of abandoned agricultural fields and the close proximity of seed sources.
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- 2021
5. Fluctuations and trends in spatio‐temporal patterns of plant species and diversity in a sandy pasture.
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Fóti, Szilvia, Bartha, Sándor, Balogh, János, Pintér, Krisztina, Koncz, Péter, Biró, Marianna, Süle, Gabriella, Petrás, Dóra, De Luca, Giulia, Mészáros, Ádám, Zimmermann, Zita, Szabó, Gábor, Csathó, András István, Ladányi, Márta, Péli, Evelin Ramóna, and Nagy, Zoltán
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PLANT species diversity ,PLANT species ,COMMUNITIES ,SOIL respiration ,ECOSYSTEMS ,SPRING - Abstract
Aims: The relative importance of species within an ecosystem shows spatio‐temporal variability related to both the terrain features and numerous rapidly changing factors. Accordingly, functional and species patterns may show some level of persistence, or, due to various disturbances, fluctuations. Communities with high species richness were found to maintain a higher degree of stability than species‐poor or perturbed vegetations; however, diversity and its stability may be spatio‐temporally variable. Based on these considerations, our aim was to assess the responses of a sandy pasture, both species‐wise and at the community level, to the relatively invariant habitat, and to the more rapidly changing environmental conditions. Location: Hungary. Methods: We surveyed the vegetation in an area of about 1 ha by means of high‐resolution spatio‐temporal sampling: we recorded the surface aerial cover (%) of the plant species during 15 campaigns covering spring, summer and autumn aspects for seven years (2013–2019) in 80 × 60 m grids. The biological activity of the ecosystem (above‐ground biomass, soil respiration) was also followed up together with the environmental limiting factors. Results: During the study period, which was characterized by significant warming, the grassland showed a balanced physiological performance with year‐to‐year variability. Fluctuating differentiation of the plant species with different environmental optima along with the terrain attributes was assumed to be responsible for this balanced physiological performance. Although community‐level diversity remained stable, some species favoring cooler, wetter positions disappeared. Conclusions: Terrain features of the study area within 1.5 m or less elevation differences created considerably heterogeneous conditions for a high number (114) of plant species with different ecological needs to co‐occur. The stability of the diversity was found to show terrain relatedness, that is spatial as well as temporal patterns compared to the null model of spatio‐temporal independence, and the ecosystem functions followed these patterns. [ABSTRACT FROM AUTHOR]
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- 2023
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6. Grazed Pannonian grassland beta-diversity changes due to C4 yellow bluestem
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Szentes Szilárd, Sutyinszki Zsuzsanna, Szabó Gábor, Zimmermann Zita, Házi Judit, Wichmann Barnabás, Hufnágel Levente, Penksza Károly, and Bartha Sándor
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dominant grass ,plant neighbourhood diversity ,litter ,spatial association ,climate change ,Biology (General) ,QH301-705.5 - Published
- 2012
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7. The Effects of Different Management Methods on Restored Grasslands in Potential Temperate Forest Zones.
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Zachar, Zalán, Pápay, Gergely, Csontos, Péter, Szabó, Gábor, Zimmermann, Zita, Saláta, Dénes, Szentes, Szilárd, Pajor, Ferenc, Fuchs, Márta, and Penksza, Károly
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TEMPERATE forests ,GRASSLAND restoration ,NATURE conservation ,GRASSLANDS ,GRAZING ,GAME & game-birds ,ECOLOGICAL engineering - Abstract
The European temperate forest zone has great importance, in terms of maintaining the habitats of not only forests but also anthropogenous grasslands, which were formed as a result of habitat reconstruction. These habitats have great importance, by means of nature conservation, landscape use, economy, and forest and grassland use. The mosaic-like habitat complexes that consist of these grasslands and forest patches help to increase biodiversity and supply the habitat for forest game. In this survey, changes in the vegetation of the temperate forests (Fagetum) of the Mátra Mountains of Hungary were investigated after reconstruction. In 2012, shrub cutting was carried out in the area of Parádóhuta, and then three different management methods (abandoning, mowing, and grazing) were utilized. Our goals were the following: to perform a vegetation survey of the sample areas (i); surveying the natural regeneration of the grassland and analyzing its biodiversity, nature conservation, and economical value (ii); and analyzing the vegetation in terms of nature conservation and valuing its life form spectrum, economy values, and livestock-feeding ability (iii). According to our results, systematic mowing and a less-intensive grazing had a significantly positive effect on biodiversity and the coverage of species, thus increasing the naturalness of the studied grassland habitats, while wild game were able to act as ecological engineers. [ABSTRACT FROM AUTHOR]
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- 2022
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8. Impact of shrub cover and wild ungulate browsing on the vegetation of restored mountain hay meadows
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Pápay, Gergely, Kiss, Orsolya, Fehér, Ádám, Szabó, Gábor, Zimmermann, Zita, Hufnagel, Levente, Falusi, Eszter S., Járdi, Ildikó, Saláta, Dénes, Szemethy, László, Penksza, Károly, and Katona, Krisztián
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FOS: Biological sciences - Abstract
Grasslands of middle mountain regions are among the most diverse habitats of the Carpathian Basin, but they are threatened by spontaneous succession leading to woody encroachment. It is a high priority of nature conservation to preserve these diverse habitats by suppressing the woody encroachment and to create new open habitat patches by scrub removal. The main goal of this study was to investigate the effect of shrub cover on plant species composition and vegetation in terms of relative ecological indica-tor values in semi-natural grassland patches. We also aimed at studying the wild browsers’ preference for woody species, which potentially plays a role in shrub encroachment. The study was conducted in the Mátra mountains, North-Hungary, where three study sites were selected within the Fagetalia belt: two sites recently restored by scrub removal with different post-restoration management and a semi-natural grassland as a control site. All of the sites were available for wild ungulate grazing. At each study site, vegetation and browsing data were recorded at 50 sampling points for which we used circu-lar plots with a radius of 1.13 m (4 m2). The highest shrub cover was found in the clearing that was grazed only by wild ungulates. The linear regression analysis showed that shrub cover significantly increased the abundance-weighted nutrient (NB) and water (WB) scores and decreased the naturalness value (SBT). Moreover, we found that an increase of shrub cover significantly decreased cover and species richness of grassland specialists, but increased weed cover. Most of the woody species were browsed in relation to their abundance except Rubus and Acer species, which were non-preferred. Our results highlight that shrub encroachment has a negative effect on semi-natural grasslands and that beside wild ungulate browsing additional management is needed to preserve these diverse habitats.
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- 2020
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9. Repeated stand structure inventory dataset in long abandoned deciduous forest reserves in Hungary
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Szegleti, Zsófia, Vig, Ákos, Ortmann-Ajkai, Adrienne, Szabó, Gábor, Zimmermann, Zita, and Horváth, Ferenc
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- 2023
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10. High-Resolution Transect Sampling and Multiple Scale Diversity Analyses for Evaluating Grassland Resilience to Climatic Extremes.
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Bartha, Sándor, Szabó, Gábor, Csete, Sándor, Purger, Dragica, Házi, Judit, Csathó, András István, Campetella, Giandiego, Canullo, Roberto, Chelli, Stefano, Tsakalos, James Lee, Ónodi, Gábor, Kröel-Dulay, György, and Zimmermann, Zita
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MULTIPLE scale method ,CLIMATE extremes ,DROUGHTS ,GRASSLANDS ,VEGETATION monitoring ,SPECIES pools - Abstract
Diversity responses to climatic factors in plant communities are well understood from experiments, but less known in natural conditions due to the rarity of appropriate long-term observational data. In this paper, we use long-term transect data sampled annually in three natural grasslands of different species pools, soils, landscape contexts and land use histories. Analyzing these specific belt transect data of contiguous small sampling units enabled us to explore scale dependence and spatial synchrony of diversity patterns within and among sites. The 14-year study period covered several droughts, including one extreme event between 2011 and 2012. We demonstrated that all natural grasslands responded to droughts by considerable fluctuations of diversity, but, overall, they remained stable. The plant functional group of annuals showed high resilience at all sites, while perennials were resistant to droughts. Our results were robust to changing spatial scales of observations, and we also demonstrated that within-site spatial synchrony could be used as a sensitive indicator of external climatic effects. We propose the broad application of high-resolution belt transects for powerful and adaptive vegetation monitoring in the future. [ABSTRACT FROM AUTHOR]
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- 2022
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11. How sampling method affects species richness and species-area curves at different spatial scales in grasslands?
- Author
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Zimmermann, Zita, Dengler, Jürgen, Wellstein, Camilla, UĞURLU, EMİN, Jentsch, Anke, Campetella, Giandiego, Bartha, Sandor, Szabo, Gabor, Kreyling, Jürgen, and GÜLER, BEHLÜL
- Published
- 2019
12. Shift from trait convergence to divergence along old-field succession.
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Backhaus, Lindsay, Albert, Georg, Cuchietti, Anibal, Jaimes Nino, Luisa María, Fahs, Nina, Lisner, Aleš, Kolář, Vojtěch, Kermavnar, Janez, Widmer, Stefan, Zimmermann, Zita, Rofrics, Nora, de Bello, Francesco, Lepš, Jan, and Medina, Nagore García
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ECOLOGICAL succession ,LEAF area ,PROTECTED areas ,PHYLOGENY ,KARST ,STOCHASTIC convergence - Abstract
Aims: Ecological theories predict that assembly processes shape communities so that co-existing species may either be functionally more dissimilar ("divergence") or more similar ("convergence") than expected by chance. Two important factors that are rarely considered in combination are spatial scale and successional stage. Our aim is to identify different functional patterns during succession across spatial scales and to discuss the likely underlying assembly processes. We expect to find convergence due to environmental filtering at early succession, especially at the largest scales, and a tendency towards divergence driven by competitive interactions as succession unfolds and at smaller spatial scales. Location: Protected Landscape Area “Bohemian Karst”, Czech Republic. Methods: We studied three succession stages (two, eight and 55 years after abandonment). Each field was sampled using 40 1-m² quadrats containing 100 pins in a regular grid. We analysed trait dispersion at several combinations of grain and extent and characterised trait similarity using phylogeny and four traits: specific leaf area, leaf dry matter content, height, and seed mass analysed individually and combined using Gower distance (multi-trait dissimilarity). Results: In the youngest field, three of the traits individually and the multi-trait dissimilarity showed convergence regardless of scale. Phylogeny showed convergence at most spatial scales of the youngest stage. The other two fields showed greater divergence predominantly in the oldest field at the smallest spatial scale. Conclusions: The results are mainly congruent with theoretical expectations and provide a valuable example of directional changes from trait convergence to divergence along succession. The scale-invariant convergence in the early stages of succession seems to be the result of environmental filtering and weaker competitive exclusion. At later stages and particularly at smaller scales, divergence becomes more common, likely because competition limits the trait similarity of species. These results highlight the importance of predictable (non-random) changes in ecological succession. [ABSTRACT FROM AUTHOR]
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- 2021
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13. Comparative study on grasslands dominated by Festuca vaginata and F. pseudovaginata in the Carpathian Basin
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Szabó, Gábor, Zimmermann, Zita, Catorci, Andrea, Csontos, Péter, Wichmann, Barnabás, Szentes, Szilárd, Barczi, Attila, and Penksza, Károly
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ddc:580 - Abstract
The aim of our study was to reveal the differences in the species composition and soil properties of open sandy grasslands dominated by different Festuca species, Festuca vaginata and F. pseudovaginata. Due to the arid conditions, sandy grasslands are generally covered by xerothermic vegetation in which F. vaginata is a typical dominant species. Festuca pseudovaginata, a species newly described by the authors, can also gain dominance in sandy grasslands. However, species composition and soil properties of grasslands dominated by this recently discovered species are still undiscovered. Based on previous coenological studies, we hypothesised that the grasslands characterised by the endemic F. vaginata are more species-rich than those with F.pseudovaginata. Coenological sampling was carried out in May 2009 at two study sites using the Braun-Blanquet method in quadrats of 2 m × 2 m. Five relevés were sampled in stands dominated by F. vaginata and F. pseudovaginata respectively at two study sites in Central Hungary, resulting in a total of twenty relevés. Analyses were based on the cover scores of vascular plant species and cryptogam crust and values of seven soil properties (pH [KCl], pH [H2O], humus, total N, Ca, P2O5 and K2O) measured in the 0–15 and 15–30 cm soil layers. Soil properties of the grasslands dominated by F. pseudovaginata and F. vaginata (dependent variables) were compared by linear mixed models, where ‘grassland type’ was the fixed factor and ‘site nested in grassland type’ was considered as random factor. Data were analysed by cluster analysis, fusion algorithm was a combinatorial method (minimising increase of variance), and the correlation was used as comparative function. We compared the cover of subordinate species by Mann-Whitney U test. We found that F. pseudovaginata and F. vaginata samples were well separated, and grasslands dominated by F. pseudovaginata had nearly two times more species than those dominated by F. vaginata. Based on the cluster analyses using plant cover and upper 0–15 cm soil layer data, F. pseudovaginata and F. vaginata groups could be well separated. Linear mixed models revealed that F. vaginata grasslands were typical on soils with higher pH, nitrogen, phosphorous and potassium contents compared to F. pseudovaginata grasslands, which indicates a tight connection between the properties of the upper soil layer and the vegetation in sandy grasslands. In den semiariden Gebieten der pannonisch-biogeographischen Region bilden offene Sandtrockenrasen auf den entsprechenden Standorten die typische Vegetation (MOLNÁR 2003). Im Stromland zwischen Donau und Theiß in Zentral-Ungarn herrschen Sandmagerrasen mit Festuca vaginata und F. pseudovaginata vor; dabei wurde F. pseudovaginata erst kürzlich von F. vaginata abgespalten (PENKSZA 2003). Inwieweit die beiden Arten auch unterschiedliche ökologische Ansprüche besitzen und unterschiedlich vergesellschaftet sind, war dementsprechend bislang nicht bekannt. Unser Ziel war daher die Untersuchung möglicher Unterschiede in (1) der Artenzusammensetzung und (2) den Bodenbedingungen zwischen Sandtrockenrasen mit dominantem Auftreten von F. vaginata oder F. pseudovaginata. Die beiden Untersuchungsgebiete, Tatárszentgyörgy und Imrehegy, liegen in der pannonisch-biogeographischen Region in Zentral-Ungarn. In beiden Gebieten wurden im Mai 2009 Bestände mit dominanten Vorkommen von Festuca vaginata und F. pseudovaginata untersucht. Pro Gebiet und Vegetationstyp wurden fünf 2 × 2 m-Vegetationsaufnahmen (insgesamt 20 Aufnahmen) nach der Methode von BRAUN-BLANQUET (1951) erstellt. In jeder Aufnahmefläche wurden aus dem Oberboden (Bodentiefe 0–15 cm) und Unterboden (15–30 cm) Proben entnommen und die folgenden Parameter wurden darin gemessen: pH-Wert in KCl und H2O sowie die Gehalte an Humus, Gesamtstickstoff, Phosphat, Kalzium und Kalium. In den statistischen Analysen wurden die beiden Vegetationstypen als Faktor ‘Graslandtyp’ (F. pseudovaginata- vs. F. vaginata-Rasen) und die beiden Gebiete als Faktor ‘Gebiet’ (Tatárszentgyörgy vs. Imrehegy) definiert. Insgesamt (in allen 20 Aufnahmen) konnten wir 76 Gefäßpflanzenarten nachweisen, davon 23 Arten in beiden Rasentypen, vier Arten nur in Festuca vaginata-Rasen und 49 Arten nur im F. pseudovaginata-Rasen. Die beiden Rasentypen unterschieden sich in ihrem Artenreichtum deutlich. Mit 19,6 ± 1,1 Arten pro Aufnahmefläche (Mittelwert und Standardabweichung) in Tatárszentgyörgy bzw. 25,2 ± 4,0 Arten in Imrehegy waren die F. pseudovaginata-Rasen artenreicher als die F. vaginata-Rasen welche in Tatárszentgyörgy 10,0 ± 3,4 Arten und in Imrehegy 11,4 ± 1,3 Arten aufwiesen. Die Clusteranalyse mit allen Arten trennte die F. vaginata- und F. pseudovaginata-Rasen in beiden Gebieten voneinander.
- Published
- 2017
14. Trait based assembly rules across climatic gradients of European grasslands are affected little by extreme drought
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bloor, juliette, Cianfaglione, kevin, dengler, jürgen, von Gillhaussen, philipp, hazi, judit, komoly, ceclia, kreyling, jürgen, pottier, julien, Sopotlieva, desislava, chelli, stefano, szabo, gabor, UĞURLU, EMİN, Terziiska, tvetelina, Zimmermann, zita, campatella, giandiego, bartha, sandor, GÜLER, BEHLÜL, jentsc, anke, wellstein, Camilla, canullo, roberto, and apostolova, iva
- Published
- 2015
15. Effects of rooted and shoot sampling schemes on species richness and species- area curves
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bartha, sandor, GÜLER, BEHLÜL, dengler, jürgen, kreyling, jürgen, jentsch, anke, Zimmermann, zita, szabo, gabor, Campetella, giandiego, wellstein, camilla, and UĞURLU, EMİN
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- 2015
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16. Trait-based assembly rules across climatic gradients of European grasslands are affected little by extreme drought
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Wellstein, Camilla, Jentsch, Anke, Chelli, Stefano, Campetella, Giandiego, Canullo, Roberto, Apostolova, Iva, Bloor, Juliette, Cianfaglione, Kevin, Dengler, Jürgen, von Gillhaußen, Philipp, Güler, Behlül, Házi, Judit, Komoly, Cecília, Kreyling, Jürgen, Pottier, Julien, Szabó, Gábor, Terziiska, Tsvetelina, Uğurlu, Emin, Zimmermann, Zita, and Bartha, Sándor
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- 2015
17. Effects of rooted and shoot sampling schemes on species richness and species-area curves
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Zimmermann, Zita, Szabó, Gábor, Bartha, Sándor, Campetella, Giandiego, Güler, Behlül, Jentsch, Anke, Kreyling, Jürgen, Ugurlu, Emin, Wellstein, Camilla, and Dengler, Jürgen
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- 2015
18. Effect of plot shape and arrangement on species richness counts in grasslands
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Canullo, Roberto, GÜLER, BEHLÜL, Dengler, Jürgen, Zimmermann, Zita, Wellstein, Camilla, UĞURLU, EMİN, Szabo, Gabor, Kreyling, Jürgen, Hazi, Judit, Campetella, Giandiego, Bloor, Juliette, Bartha, Sandor, Apostolova, Iva, and jentsch, anke
- Published
- 2014
19. Trait based assembly rules across climatic gradients of European grasslands
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Apostolova, Iva, Kreyling, Jürgen, Pottier, Julien, Szabo, Gabor, Terziiska, Tvetelina, UĞURLU, EMİN, Zimmermann, Zita, Sandor, Bartha, GÜLER, BEHLÜL, Dengler, Jürgen, Cianfaglione, Kevin, Bloor, Juliette, Capullo, Roberto, Campetella, Giandiego, Stefano, Chelli, Jentsch, Anke, Wellstein, Camilla, hazi, judit, Komoly, Cecilia, and von Gillhaussen, Philipp
- Published
- 2014
20. How plot shape and arrangement affect species richness counts: Implications for sampling design and rarefaction
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Güler, Behlül, Jentsch, Anke, Apostolova, Iva, Bartha, Sándor, Bloor, Juliette M.G., Giandiego Campetella, Canullo, Roberto, Házi, Judit, Kreyling, Jürgen, Pottier, Julien, Szabó, Gábor, Tsvetelina Terziiska, Ugurlu, Emin, Wellstein, Camilla, Zimmermann, Zita, and Dengler, Jürgen
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- 2014
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21. Temporal Variability of CO2 and N2O Flux Spatial Patterns at a Mowed and a Grazed Grassland.
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Fóti, Szilvia, Balogh, János, Papp, Marianna, Koncz, Péter, Hidy, Dóra, Csintalan, Zsolt, Kertész, Péter, Bartha, Sándor, Zimmermann, Zita, Biró, Marianna, Hováth, László, Molnár, Erik, Szaniszló, Albert, Kristóf, Krisztina, Kampfl, Györgyi, and Nagy, Zoltán
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GREENHOUSE gardening ,GRASSLAND management ,BIOMASS & the environment ,SOIL respiration ,SOIL moisture ,SOIL temperature measurement ,GARDENING & the environment - Abstract
Spatial patterns of ecosystem processes constitute significant sources of uncertainty in greenhouse gas flux estimations partly because the patterns are temporally dynamic. The aim of this study was to describe temporal variability in the spatial patterns of grassland CO
2 and N2 O flux under varying environmental conditions and to assess effects of the grassland management (grazing and mowing) on flux patterns. We made spatially explicit measurements of variables including soil respiration, aboveground biomass, N2 O flux, soil water content, and soil temperature during a 4-year study in the vegetation periods at grazed and mowed grasslands. Sampling was conducted in 80 × 60 m grids of 10 m resolution with 78 sampling points in both study plots. Soil respiration was monitored nine times, and N2 O flux was monitored twice during the study period. Altitude, soil organic carbon, and total soil nitrogen were used as background factors at each sampling position, while aboveground biomass, soil water content, and soil temperature were considered as covariates in the spatial analysis. Data were analyzed using variography and kriging. Altitude was autocorrelated over distances of 40–50 m in both plots and influenced spatial patterns of soil organic carbon, total soil nitrogen, and the covariates. Altitude was inversely related to soil water content and aboveground biomass and positively related to soil temperature. Autocorrelation lengths for soil respiration were similar on both plots (about 30 m), whereas autocorrelation lengths of N2 O flux differed between plots (39 m in the grazed plot vs. 18 m in the mowed plot). Grazing appeared to increase heterogeneity and linkage of the spatial patterns, whereas mowing had a homogenizing effect. Spatial patterns of soil water content, soil respiration, and aboveground biomass were temporally variable especially in the first 2 years of the experiment, whereas spatial patterns were more persistent (mostly significant correlation atp < 0.05 between location ranks) in the second 2 years, following a wet year. Increased persistence of spatial patterns after a wet year indicated the recovery potential of grasslands following drought and suggested that adequate water supply could have a homogenizing effect on CO2 and N2 O fluxes. [ABSTRACT FROM AUTHOR]- Published
- 2018
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22. Grazed Pannonian grassland beta-diversity changes due to C yellow bluestem.
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Szentes, Szilárd, Sutyinszki, Zsuzsanna, Szabó, Gábor, Zimmermann, Zita, Házi, Judit, Wichmann, Barnabás, Hufnágel, Levente, Penksza, Károly, and Bartha, Sándor
- Abstract
This study investigates how yellow bluestem affects biodiversity in a typical Pannonian grassland. Beta diversity ( i.e. the finescale spatial variability of species compositions), was estimated by the realized number of species combinations sampled at various scales. Sampling was performed by a standard protocol. Presences of plant species were recorded along 52.2 m long belt transect of 1044 units of 0.05x0.05 m contiguous microquadrats. According to the results the massive presence of tested C grass significantly reduced species richness of the grassland. Beta diversity assessment revealed that 90% of species combinations were lost due to yellow bluestem invasion. Fine-scale spatial pattern analyses showed complete local extinctions of other species from microsites dominated by yellow bluestem. This local extinction is enhanced by the specific clonal architecture of this species and by the accumulation of litter. Other dominant grasses had no effect on fine scale diversity, i.e. they could coexist well with other elements of the local flora. This study presents currently developed microhabitat types, forecasts and also draws attention to the danger that climate warming will probably enhance the spread of this detrimental C species. [ABSTRACT FROM AUTHOR]
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- 2012
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23. Meta-analysis of field scale spatial variability of grassland soil CO2 efflux: Interaction of biotic and abiotic drivers.
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Fóti, Szilvia, Balogh, János, Herbst, Michael, Papp, Marianna, Koncz, Péter, Bartha, Sándor, Zimmermann, Zita, Komoly, Cecília, Szabó, Gábor, Margóczi, Katalin, Acosta, Manuel, and Nagy, Zoltán
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GRASSLANDS , *SOIL moisture , *VEGETATION & climate , *ECOSYSTEMS , *CLIMATE change , *META-analysis - Abstract
In this study eight temperate grassland sites were monitored for soil CO 2 efflux (R s ) and the spatial covariate soil water content (SWC) and soil temperature (T s ) at fine scale in over 77 measurement campaigns. The goals of this multisite study were to explore the correlations between environmental gradients and spatial patterns of R s , SWC and T s , which are not site-specific and to quantify the relevance of biotic and abiotic controls over spatial patterns along increasing vegetation structural complexity. These patterns in water-limited ecosystems in East-Central Europe are likely to be influenced by summer droughts caused by the changing climate. A consistent experimental setup was applied at the study sites including 75 sampling locations along 15 m circular transects. Spatial data processing was mainly based on variography. Two proxy variables were introduced to relate the site characteristics in terms of soils, water status and vegetation. Normalised SWC (SWCn) reconciled site-specific soil water regimes while normalised day of year integrated temperature and vegetation phenology. A principal component analysis revealed that the progressing closure of vegetation in combination with large R s and SWCn values, as well as low T s and R s variability support the detectability of spatial patterns found in both the abiotic and biotic variables. Our results showed that apart from SWC the pattern of soil temperature also had an effect on spatial structures. We detected that when the spatially structured variability of T s was low, a strong negative correlation existed between SWCn and the spatial autocorrelation length of R s with r = 0.66 (p < 0.001). However, for high spatially structured variability of T s , occurring presumably at low T s in spring and autumn, the correlation did not exist and it was difficult to quantify the spatial autocorrelation of R s . Our results are indicative of a potential shift from homogeneity and dominance of biotic processes to an increased heterogeneity and abiotic regulation in drought prone ecosystems under conditions of decreasing soil moisture. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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24. Consistent predictors of microbial community composition across spatial scales in grasslands reveal low context-dependency.
- Author
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Radujković D, Vicca S, van Rooyen M, Wilfahrt P, Brown L, Jentsch A, Reinhart KO, Brown C, De Gruyter J, Jurasinski G, Askarizadeh D, Bartha S, Beck R, Blenkinsopp T, Cahill J, Campetella G, Canullo R, Chelli S, Enrico L, Fraser L, Hao X, Henry HAL, Hohn M, Jouri MH, Koch M, Lawrence Lodge R, Li FY, Lord JM, Milligan P, Minggagud H, Palmer T, Schröder B, Szabó G, Zhang T, Zimmermann Z, and Verbruggen E
- Subjects
- Soil Microbiology, Fungi genetics, Bacteria genetics, Plants microbiology, Soil, Grassland, Microbiota genetics
- Abstract
Environmental circumstances shaping soil microbial communities have been studied extensively. However, due to disparate study designs, it has been difficult to resolve whether a globally consistent set of predictors exists, or context-dependency prevails. Here, we used a network of 18 grassland sites (11 of those containing regional plant productivity gradients) to examine (i) if similar abiotic or biotic factors predict both large-scale (across sites) and regional-scale (within sites) patterns in bacterial and fungal community composition, and (ii) if microbial community composition differs consistently at two levels of regional plant productivity (low vs. high). Our results revealed that bacteria were associated with particular soil properties (such as base saturation) and both bacteria and fungi were associated with plant community composition across sites and within the majority of sites. Moreover, a discernible microbial community signal emerged, clearly distinguishing high and low-productivity soils across different grasslands independent of their location in the world. Hence, regional productivity differences may be typified by characteristic soil microbial communities across the grassland biome. These results could encourage future research aiming to predict the general effects of global changes on soil microbial community composition in grasslands and to discriminate fertile from infertile systems using generally applicable microbial indicators., (© 2023 John Wiley & Sons Ltd.)
- Published
- 2023
- Full Text
- View/download PDF
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