Alexander Ač

1.9k total citations · 1 hit paper
32 papers, 1.2k citations indexed

About

Alexander Ač is a scholar working on Global and Planetary Change, Plant Science and Ecology. According to data from OpenAlex, Alexander Ač has authored 32 papers receiving a total of 1.2k indexed citations (citations by other indexed papers that have themselves been cited), including 21 papers in Global and Planetary Change, 15 papers in Plant Science and 13 papers in Ecology. Recurrent topics in Alexander Ač's work include Plant Water Relations and Carbon Dynamics (20 papers), Remote Sensing in Agriculture (12 papers) and Plant responses to elevated CO2 (9 papers). Alexander Ač is often cited by papers focused on Plant Water Relations and Carbon Dynamics (20 papers), Remote Sensing in Agriculture (12 papers) and Plant responses to elevated CO2 (9 papers). Alexander Ač collaborates with scholars based in Czechia, United Kingdom and Switzerland. Alexander Ač's co-authors include Otmar Urban, Michal V. Marek, J. Kalina, Hartmut K. Lichtenthaler, Karel Klem, Zbyněk Malenovský, Uwe Rascher, Julie Olejníčková, Alexander Gallé and Gina H. Mohammed and has published in prestigious journals such as Renewable and Sustainable Energy Reviews, The Science of The Total Environment and Remote Sensing of Environment.

In The Last Decade

Alexander Ač

30 papers receiving 1.2k citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Recent European drought extremes beyond Common Era background variability

2021 272 citations Ulf Büntgen, Otmar Urban et al. profile →

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
Alexander Ač Czechia	14	602	566	310	299	143	32	1.2k
Olga Gavrichkova Italy	16	712 1.2×	516 0.9×	498 1.6×	300 1.0×	110 0.8×	37	1.6k
Zachary Kayler Germany	21	846 1.4×	423 0.7×	434 1.4×	504 1.7×	112 0.8×	50	1.5k
Bernd Zeller France	25	320 0.5×	529 0.9×	489 1.6×	204 0.7×	57 0.4×	54	1.6k
Peixi Su China	15	386 0.6×	730 1.3×	201 0.6×	122 0.4×	182 1.3×	76	1.3k
Virginia Hernández‐Santana Spain	22	1.1k 1.8×	1.1k 1.9×	227 0.7×	293 1.0×	52 0.4×	53	2.0k
Timothy M. Wertin United States	17	936 1.6×	742 1.3×	166 0.5×	453 1.5×	134 0.9×	21	1.4k
Josef Urban Czechia	19	808 1.3×	659 1.2×	206 0.7×	456 1.5×	118 0.8×	97	1.4k
Caitlin E. Moore Australia	21	884 1.5×	571 1.0×	762 2.5×	147 0.5×	122 0.9×	44	1.6k
Birgit Gielen Belgium	17	1.3k 2.1×	1.0k 1.8×	307 1.0×	478 1.6×	167 1.2×	21	2.0k
Mirco Rodeghiero Italy	24	959 1.6×	634 1.1×	558 1.8×	257 0.9×	153 1.1×	46	1.9k

Countries citing papers authored by Alexander Ač

Since Specialization

Citations

This map shows the geographic impact of Alexander Ač's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Alexander Ač with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Alexander Ač more than expected).

Fields of papers citing papers by Alexander Ač

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Alexander Ač. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Alexander Ač. The network helps show where Alexander Ač may publish in the future.

Co-authorship network of co-authors of Alexander Ač

This figure shows the co-authorship network connecting the top 25 collaborators of Alexander Ač. A scholar is included among the top collaborators of Alexander Ač based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Alexander Ač. Alexander Ač is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

Oulehle, Filip, Pavel Šamonil, Otmar Urban, et al.. (2025). Growth and Assemblage Dynamics of Temperate Forest Tree Species Match Physiological Resilience to Changes in Atmospheric Chemistry. Global Change Biology. 31(3). e70147–e70147. 1 indexed citations

Jansen, Marcel A. K., Alexander Ač, John Grace, & Otmar Urban. (2025). A Global Meta‐Analysis of Water Use Efficiency Proxies Reveals That UV Radiation Decreases Transpiration Without Improving WUE. Plant Cell & Environment. 48(9). 6734–6747.

Ač, Alexander, Marcel A. K. Jansen, J. Grace, & Otmar Urban. (2024). Unravelling the neglected role of ultraviolet radiation on stomata: A meta‐analysis with implications for modelling ecosystem–climate interactions. Plant Cell & Environment. 47(5). 1769–1781. 3 indexed citations

Novotný, Jan, Ladislav Šigut, Alexander Ač, et al.. (2023). Estimation of photosynthetic dynamics in forests from daily measured fluorescence and PRI data with adjustment for canopy shadow fraction. The Science of The Total Environment. 898. 166386–166386. 2 indexed citations

Ač, Alexander, et al.. (2022). Combining NDVI, PRI and the quantum yield of solar-induced fluorescence improves estimations of carbon fluxes in deciduous and evergreen forests. The Science of The Total Environment. 829. 154681–154681. 17 indexed citations

Ač, Alexander, et al.. (2022). A meta-analysis of the effects of UV radiation on the plant carotenoid pool. Plant Physiology and Biochemistry. 183. 36–45. 20 indexed citations

Mikac, Stjepan, Otmar Urban, Tomáš Kolář, et al.. (2021). Stable Isotopes in Tree Rings of Pinus heldreichii Can Indicate Climate Variability over the Eastern Mediterranean Region. Forests. 12(3). 350–350. 7 indexed citations

Jansen, Marcel A. K., Alexander Ač, Karel Klem, & Otmar Urban. (2021). A meta‐analysis of the interactive effects of UV and drought on plants. Plant Cell & Environment. 45(1). 41–54. 31 indexed citations

Büntgen, Ulf, Tomáš Kolář, Michal Rybníček, et al.. (2020). No Age Trends in Oak Stable Isotopes. Paleoceanography and Paleoclimatology. 35(4). 30 indexed citations

10.

Djomo, Sylvestre Njakou, Alexander Ač, Terenzio Zenone, et al.. (2014). Energy performances of intensive and extensive short rotation cropping systems for woody biomass production in the EU. Renewable and Sustainable Energy Reviews. 41. 845–854. 97 indexed citations

11.

Ač, Alexander, F. Daumard, Matthias Drusch, et al.. (2014). FLEX/Sentinel-3 Tandem Mission Photosynthesis Study – An investigation of steady-state chlorophyll fluorescence and photosynthesis in terrestrial vegetation. University of Twente Research Information. 1 indexed citations

12.

Malenovský, Zbyněk, Otmar Urban, Vladimı́r Špunda, et al.. (2013). Response of green reflectance continuum removal index to the xanthophyll de-epoxidation cycle in Norway spruce needles. Journal of Experimental Botany. 64(7). 1817–1827. 20 indexed citations

13.

Ač, Alexander, et al.. (2013). Optical indicators of plant physiological activity. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis. 60(3). 101–110.

14.

Urban, Otmar, Karel Klem, Alexander Ač, et al.. (2011). Impact of clear and cloudy sky conditions on the vertical distribution of photosynthetic CO₂ uptake within a spruce canopy. Functional Ecology. 26(1). 46–55. 128 indexed citations

15.

Klem, Karel, Alexander Ač, Petr Holub, et al.. (2011). Interactive effects of PAR and UV radiation on the physiology, morphology and leaf optical properties of two barley varieties. Environmental and Experimental Botany. 75. 52–64. 57 indexed citations

16.

Ač, Alexander, Zbyněk Malenovský, Jan Hanuš, et al.. (2009). Near-distance imaging spectroscopy investigating chlorophyll fluorescence and photosynthetic activity of grassland in the daily course. Functional Plant Biology. 36(11). 1006–1015. 12 indexed citations

17.

Ač, Alexander, Kumud Bandhu Mishra, Zbyněk Malenovský, et al.. (2008). Towards remote sensing of vegetation processes. Socio-Environmental Systems Modeling. 19–23. 1 indexed citations

18.

Urban, Otmar, Alexander Ač, J. Kalina, et al.. (2007). Temperature dependences of carbon assimilation processes in four dominant species from mountain grassland ecosystem. Photosynthetica. 45(3). 392–399. 14 indexed citations

19.

Verrelst, Jochem, Alexander Ač, Zbyněk Malenovský, et al.. (2007). Angular chlorophyll indices estimates derived from ground-based diurnal course data and multiangular CHRIS-PROBA data: Two case studies. Zurich Open Repository and Archive (University of Zurich). 15–15. 1 indexed citations

20.

Lichtenthaler, Hartmut K., Alexander Ač, Michal V. Marek, J. Kalina, & Otmar Urban. (2007). Differences in pigment composition, photosynthetic rates and chlorophyll fluorescence images of sun and shade leaves of four tree species. Plant Physiol Biochem. 6 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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