Hiroko Akiyama

5.8k total citations · 1 hit paper
77 papers, 4.3k citations indexed

About

Hiroko Akiyama is a scholar working on Soil Science, Environmental Chemistry and Ecology. According to data from OpenAlex, Hiroko Akiyama has authored 77 papers receiving a total of 4.3k indexed citations (citations by other indexed papers that have themselves been cited), including 46 papers in Soil Science, 44 papers in Environmental Chemistry and 17 papers in Ecology. Recurrent topics in Hiroko Akiyama's work include Soil Carbon and Nitrogen Dynamics (45 papers), Soil and Water Nutrient Dynamics (44 papers) and Groundwater and Isotope Geochemistry (12 papers). Hiroko Akiyama is often cited by papers focused on Soil Carbon and Nitrogen Dynamics (45 papers), Soil and Water Nutrient Dynamics (44 papers) and Groundwater and Isotope Geochemistry (12 papers). Hiroko Akiyama collaborates with scholars based in Japan, China and United States. Hiroko Akiyama's co-authors include Kazuyuki Yagi, Xiaoyuan Yan, Haruo Tsuruta, Hajime Akimoto, Shigeto Sudo, Seiichi Nishimura, Yoshitaka Uchida, Masahito Hayatsu, Yanjiang Cai and Atsushi Hayakawa and has published in prestigious journals such as Nature Communications, Journal of Geophysical Research Atmospheres and PLoS ONE.

In The Last Decade

Hiroko Akiyama

74 papers receiving 4.2k 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.

Evaluation of effectiveness of enhanced‐efficiency fertilizers as mitigation options for N₂O and NO emissions from agricultural soils: meta‐analysis

2009 600 citations Hiroko Akiyama, Xiaoyuan Yan et al. profile →

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
Hiroko Akiyama Japan	35	2.5k	1.5k	1.1k	996	706	77	4.3k
Bo Zhu China	36	2.9k 1.2×	1.8k 1.2×	1.1k 0.9×	919 0.9×	483 0.7×	184	4.9k
Gary Lanigan Ireland	38	2.0k 0.8×	1.4k 0.9×	1.4k 1.2×	816 0.8×	547 0.8×	136	4.4k
Weijin Wang Australia	40	3.3k 1.3×	1.3k 0.8×	1.4k 1.3×	1.3k 1.3×	441 0.6×	129	5.2k
Guangxi Xing China	33	3.2k 1.3×	1.6k 1.1×	894 0.8×	2.1k 2.1×	498 0.7×	58	5.7k
R. P. Voroney Canada	40	3.7k 1.5×	1.5k 1.0×	1.1k 1.0×	1.1k 1.1×	388 0.5×	127	5.3k
Kazuyuki Inubushi Japan	43	2.9k 1.2×	1.1k 0.7×	1.7k 1.5×	1.6k 1.6×	514 0.7×	238	5.6k
F.S. Zhang China	19	2.6k 1.0×	1.2k 0.8×	859 0.8×	2.1k 2.1×	468 0.7×	23	5.2k
Lars Elsgaard Denmark	36	1.7k 0.7×	985 0.6×	1.5k 1.3×	811 0.8×	578 0.8×	144	4.0k
Reiner Ruser Germany	23	2.4k 1.0×	1.3k 0.8×	953 0.9×	739 0.7×	557 0.8×	64	3.6k
Jianlin Shen China	35	3.0k 1.2×	1.7k 1.1×	1.5k 1.4×	1.7k 1.7×	529 0.7×	115	6.6k

Countries citing papers authored by Hiroko Akiyama

Since Specialization

Citations

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

Fields of papers citing papers by Hiroko Akiyama

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Hiroko Akiyama

This figure shows the co-authorship network connecting the top 25 collaborators of Hiroko Akiyama. A scholar is included among the top collaborators of Hiroko Akiyama 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 Hiroko Akiyama. Hiroko Akiyama 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, Yan, Longlong Xia, Hiroko Akiyama, et al.. (2025). Accounting for differences between crops and regions reduces estimates of nitrate leaching from nitrogen-fertilized soils. Communications Earth & Environment. 6(1). 6 indexed citations

Nishida, Hanna, Manabu Itakura, Khin Thuzar Win, et al.. (2025). Genetic design of soybean hosts and bradyrhizobial endosymbionts reduces N2O emissions from soybean rhizosphere. Nature Communications. 16(1). 8023–8023.

Jiang, Wenting, Yongxin Lin, Hiroko Akiyama, et al.. (2025). Both biotic and abiotic soil N₂O productions are lower under organic N than inorganic N deposition in a Moso bamboo forest. Biology and Fertility of Soils. 61(7). 1271–1285. 1 indexed citations

Akiyama, Hiroko, et al.. (2025). Mitigation of nitrous oxide emissions by 3,4-dimethylpyrazole phosphate and 3,4-dimethylpyrazole succinic acid with reduced fertilizer application time while maintaining cabbage yield in Andosol fields. Agriculture Ecosystems & Environment. 393. 109767–109767. 1 indexed citations

Akiyama, Hiroko. (2024). Methane and nitrous oxide emissions from agricultural fields in Japan and mitigation options: a review. Soil Science & Plant Nutrition. 70(2). 79–87. 2 indexed citations

Akiyama, Hiroko, Tomohito Sano, Kazuya Nishina, et al.. (2022). N2O emission factors for organic amendments in Japan from measurement campaign and systematic review. The Science of The Total Environment. 864. 161088–161088. 9 indexed citations

Akiyama, Hiroko, Akinori Yamamoto, Yoshitaka Uchida, et al.. (2020). Effect of low C/N crop residue input on N2O, NO, and CH4 fluxes from Andosol and Fluvisol fields. The Science of The Total Environment. 713. 136677–136677. 19 indexed citations

Wang, Jinyang, Hiroko Akiyama, Kazuyuki Yagi, & Xiaoyuan Yan. (2018). Controlling variables and emission factors of methane from global rice fields. Atmospheric chemistry and physics. 18(14). 10419–10431. 51 indexed citations

Wang, Jinyang, Hiroko Akiyama, Kazuyuki Yagi, & Xiaoyuan Yan. (2018). How methane emission from rice paddy is affected by management practices and region?. Biogeosciences (European Geosciences Union). 1 indexed citations

10.

Tian, Linlin, Hiroko Akiyama, Bo Zhu, & Xi Shen. (2018). Indirect N2O emissions with seasonal variations from an agricultural drainage ditch mainly receiving interflow water. Environmental Pollution. 242(Pt A). 480–491. 18 indexed citations

11.

Tian, Linlin, Yanjiang Cai, & Hiroko Akiyama. (2018). A review of indirect N2O emission factors from agricultural nitrogen leaching and runoff to update of the default IPCC values. Environmental Pollution. 245. 300–306. 69 indexed citations

12.

Oo, Aung Zaw, Shigeto Sudo, Hiroko Akiyama, et al.. (2018). Effect of dolomite and biochar addition on N2O and CO2 emissions from acidic tea field soil. PLoS ONE. 13(2). e0192235–e0192235. 54 indexed citations

13.

Wang, Yong, Yoshitaka Uchida, Yumi Shimomura, Hiroko Akiyama, & Masahito Hayatsu. (2017). Responses of denitrifying bacterial communities to short-term waterlogging of soils. Scientific Reports. 7(1). 803–803. 39 indexed citations

14.

Akiyama, Hiroko, Yuko Takada Hoshino, Manabu Itakura, et al.. (2016). Mitigation of soil N2O emission by inoculation with a mixed culture of indigenous Bradyrhizobium diazoefficiens. Scientific Reports. 6(1). 32869–32869. 60 indexed citations

15.

Cai, Yanjiang & Hiroko Akiyama. (2016). Nitrogen loss factors of nitrogen trace gas emissions and leaching from excreta patches in grassland ecosystems: A summary of available data. The Science of The Total Environment. 572. 185–195. 51 indexed citations

16.

Toyoda, Sakae, Midori Yano, Seiichi Nishimura, et al.. (2011). Characterization and production and consumption processes of N₂O emitted from temperate agricultural soils determined via isotopomer ratio analysis. Global Biogeochemical Cycles. 25(2). n/a–n/a. 126 indexed citations

17.

Nishimura, Seiichi, Hiroko Akiyama, Shigeto Sudo, et al.. (2011). Combined emission of CH₄and N₂O from a paddy field was reduced by preceding upland crop cultivation. Soil Science & Plant Nutrition. 57(1). 167–178. 48 indexed citations

18.

Tanaka, Nobutada, Arayo Haga, Hiroshi Uemura, et al.. (2002). Inhibition Mechanism of Cytokine Activity of Human Autocrine Motility Factor Examined by Crystal Structure Analyses and Site-directed Mutagenesis Studies. Journal of Molecular Biology. 318(4). 985–997. 31 indexed citations

19.

Morimoto, Shiro, et al.. (1984). High-performance liquid chromatography with a continous-flow enzyme detector for the demonstration of the conversion of rat urinary inactive kallikrein into its active form. Journal of Chromatography A. 295(1). 226–230. 2 indexed citations

20.

Hayashi, Mitsunori, et al.. (1978). Studies on Nutritional Requirements for the Growths of Marine Planktons and Eutrophication Assessment of Sea Water by Algal Growth Tests. Japan journal of water pollution research. 1(3). 199–202. 1 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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