Kajar Köster

3.2k total citations · 1 hit paper
81 papers, 1.8k citations indexed

About

Kajar Köster is a scholar working on Global and Planetary Change, Soil Science and Atmospheric Science. According to data from OpenAlex, Kajar Köster has authored 81 papers receiving a total of 1.8k indexed citations (citations by other indexed papers that have themselves been cited), including 49 papers in Global and Planetary Change, 34 papers in Soil Science and 27 papers in Atmospheric Science. Recurrent topics in Kajar Köster's work include Fire effects on ecosystems (41 papers), Soil Carbon and Nitrogen Dynamics (33 papers) and Climate change and permafrost (19 papers). Kajar Köster is often cited by papers focused on Fire effects on ecosystems (41 papers), Soil Carbon and Nitrogen Dynamics (33 papers) and Climate change and permafrost (19 papers). Kajar Köster collaborates with scholars based in Finland, Estonia and China. Kajar Köster's co-authors include Jukka Pumpanen, Frank Berninger, Egle Köster, Jussi Heinonsalo, Heidi Aaltonen, Kalev Jõgiste, Xuan Zhou, Marek Metslaid, Hui Sun and Floortje Vodde and has published in prestigious journals such as PLoS ONE, The Science of The Total Environment and Applied and Environmental Microbiology.

In The Last Decade

Kajar Köster

77 papers receiving 1.8k 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.

Data sharing practices and data availability upon request differ across scientific disciplines

2021 182 citations Leho Tedersoo, Kajar Köster et al. profile →

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
Kajar Köster Finland	26	997	525	507	405	394	81	1.8k
Eric K. Zenner United States	32	1.6k 1.6×	281 0.5×	685 1.4×	1.2k 3.0×	688 1.7×	106	2.8k
Felipe Bravo Spain	33	2.0k 2.1×	393 0.7×	426 0.8×	2.4k 6.0×	478 1.2×	200	3.5k
Xiangdong Lei China	23	1.7k 1.7×	161 0.3×	427 0.8×	1.7k 4.1×	188 0.5×	138	2.7k
Grant M. Domke United States	32	1.8k 1.8×	314 0.6×	869 1.7×	1.4k 3.5×	645 1.6×	124	3.0k
Laurel J. Anderson United States	14	573 0.6×	628 1.2×	440 0.9×	518 1.3×	129 0.3×	36	1.7k
Devin Routh Switzerland	7	992 1.0×	265 0.5×	406 0.8×	606 1.5×	277 0.7×	11	2.0k
Karin Nadrowski Germany	18	349 0.4×	187 0.4×	351 0.7×	757 1.9×	265 0.7×	27	1.2k
Brian F. Walters United States	23	862 0.9×	173 0.3×	522 1.0×	635 1.6×	225 0.6×	53	1.5k
Valerio Avitabile Netherlands	26	1.3k 1.4×	188 0.4×	1.1k 2.2×	1.0k 2.5×	314 0.8×	42	2.8k
Hubert Hasenauer Austria	34	2.5k 2.5×	216 0.4×	627 1.2×	2.2k 5.3×	454 1.2×	136	3.6k

Countries citing papers authored by Kajar Köster

Since Specialization

Citations

This map shows the geographic impact of Kajar Köster'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 Kajar Köster with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Kajar Köster more than expected).

Fields of papers citing papers by Kajar Köster

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Kajar Köster. 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 Kajar Köster. The network helps show where Kajar Köster may publish in the future.

Co-authorship network of co-authors of Kajar Köster

This figure shows the co-authorship network connecting the top 25 collaborators of Kajar Köster. A scholar is included among the top collaborators of Kajar Köster 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 Kajar Köster. Kajar Köster 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

Wang, Jianyu, Kajar Köster, Yu Cheng, et al.. (2025). The role of pyrogenic carbon addition after wildfires in the boreal forest of China: Impact on plant–soil–microbial ecological stoichiometry. Geoderma. 455. 117237–117237. 1 indexed citations

Han, Yu, Kajar Köster, Yu Cheng, et al.. (2025). Soil microhabitat conditions drive post-fire ecosystem multifunctionality changes in forests recovering from prescribed burning. Plant and Soil. 517(1). 129–142.

Berninger, Frank, Han Y. H. Chen, Nicole J. Fenton, et al.. (2025). A Meta‐Regression of 18 Wildfire Chronosequences Reveals Key Environmental Drivers and Knowledge Gaps in the Boreal Nitrogen Balance. Global Change Biology. 31(8). e70398–e70398. 1 indexed citations

Kohl, Lukas, et al.. (2025). Short-term effects of low-intensity surface fires on dissolved organic matter from boreal forest soils. Journal of Soils and Sediments. 25(11). 3225–3244.

Han, Yu, Kajar Köster, Jianyu Wang, et al.. (2024). Prescribed burning reshapes the relationship between soil chemical properties and understory plant biodiversity. CATENA. 246. 108478–108478. 2 indexed citations

Hu, Tongxin, Yu Han, Kajar Köster, et al.. (2024). Prescribed burning alters soil microbial community structure by changing soil physicochemical properties in temperate forests of northern China. Journal of Forestry Research. 35(1). 1 indexed citations

Palviainen, Marjo, Xuan Zhou, Jussi Heinonsalo, et al.. (2024). Enhancing boreal forest resilience: A four-year impact of biochar on soil quality and fungal communities. Microbiological Research. 283. 127696–127696. 6 indexed citations

Aaltonen, Heidi, Ari Laurén, Marjo Palviainen, et al.. (2022). The effects of glucose addition and water table manipulation on peat quality of drained peatland forests with different management practices. Soil Science Society of America Journal. 86(6). 1625–1638. 4 indexed citations

Agan, Ahto, Sten Anslan, Tiia Drenkhan, et al.. (2022). Long-term effects of forest fires on fungal community and soil properties along a hemiboreal Scots pine forest fire chronosequence. The Science of The Total Environment. 851(Pt 1). 158173–158173. 14 indexed citations

10.

Zobitz, John M., Heidi Aaltonen, Xuan Zhou, et al.. (2021). Comparing an exponential respiration model to alternative models for soil respiration components in a Canadian wildfire chronosequence (FireResp v1.0). Geoscientific model development. 14(10). 6605–6622. 2 indexed citations

11.

Sizov, Oleg, Ekaterina Ezhova, Andrey Soromotin, et al.. (2021). Fire and vegetation dynamics in northwest Siberia during the last 60 years based on high-resolution remote sensing. Biogeosciences. 18(1). 207–228. 19 indexed citations

12.

Qu, Zhao‐lei, Minna Santalahti, Kajar Köster, et al.. (2021). Soil Fungal Community Structure in Boreal Pine Forests: From Southern to Subarctic Areas of Finland. Frontiers in Microbiology. 12. 653896–653896. 17 indexed citations

13.

Palviainen, Marjo, Ari Laurén, Jukka Pumpanen, et al.. (2020). Decadal‐Scale Recovery of Carbon Stocks After Wildfires Throughout the Boreal Forests. Global Biogeochemical Cycles. 34(8). 25 indexed citations

14.

Ribeiro-Kumara, Caius, Egle Köster, Heidi Aaltonen, & Kajar Köster. (2020). How do forest fires affect soil greenhouse gas emissions in upland boreal forests? A review. Environmental Research. 184. 109328–109328. 62 indexed citations

15.

Aaltonen, Heidi, Kajar Köster, Egle Köster, et al.. (2019). Forest fires in Canadian permafrost region: the combined effects of fire and permafrost dynamics on soil organic matter quality. Biogeochemistry. 143(2). 257–274. 36 indexed citations

16.

Köster, Egle, Jukka Pumpanen, & Kajar Köster. (2018). Biochar as a possible new tool for afforestation practices. EGUGA. 6082. 1 indexed citations

17.

Palviainen, Marjo, Jukka Pumpanen, Frank Berninger, et al.. (2017). Nitrogen balance along a northern boreal forest fire chronosequence. PLoS ONE. 12(3). e0174720–e0174720. 17 indexed citations

18.

Sun, Hui, Minna Santalahti, Jukka Pumpanen, et al.. (2016). Bacterial community structure and function shift across a northern boreal forest fire chronosequence. Scientific Reports. 6(1). 32411–32411. 51 indexed citations

19.

Köster, Kajar, et al.. (2009). Vegetation dynamics in a fire damaged forest area: the response of major ground vegetation species.. BALTIC FORESTRY. 15(2). 206–215. 16 indexed citations

20.

Köster, Kajar, Triin Ilisson, Harri Tukia, Kalev Jõgiste, & Tõnu Möls. (2009). Early effects after forest disturbance in decomposition of trees in two windthrown areas in East Estonia.. BALTIC FORESTRY. 15(2). 143–150. 9 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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