World's Best Scientists 2026 revealed!
Keisuke Koba

Keisuke Koba

D-Index & Metrics

Environmental Sciences

D-Index
53
Citations
8049
World Ranking
4335
National Ranking
68

Keisuke Koba publication distribution in Environmental Sciences in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Environmental Sciences in 2026. The highlighted bar marks where Keisuke Koba sits on this spectrum.

41–50 publications: 21 scientists 51–60 publications: 62 scientists 61–70 publications: 133 scientists 71–80 publications: 257 scientists 81–90 publications: 361 scientists 91–100 publications: 440 scientists 101–110 publications: 492 scientists 111–120 publications: 541 scientists 121–130 publications: 617 scientists 131–140 publications: 544 scientists 141–150 publications: 541 scientists 151–160 publications: 539 scientists 161–170 publications: 444 scientists 171–180 publications: 444 scientists 181–190 publications: 400 scientists 191–200 publications: 377 scientists 201–210 publications: 318 scientists 211–220 publications: 282 scientists 221–230 publications: 263 scientists 231–240 publications: 220 scientists 241–250 publications: 217 scientists 251–260 publications: 180 scientists 261–270 publications: 181 scientists 271–280 publications: 155 scientists 281–290 publications: 130 scientists 291–300 publications: 127 scientists 301–310 publications: 130 scientists 311–320 publications: 85 scientists 321–330 publications: 106 scientists 331–340 publications: 80 scientists 341–350 publications: 83 scientists 351–360 publications: 75 scientists 361–370 publications: 69 scientists 371–380 publications: 52 scientists 381–390 publications: 54 scientists 391–400 publications: 56 scientists 401–410 publications: 44 scientists 411–420 publications: 40 scientists 421–430 publications: 36 scientists 431–440 publications: 25 scientists 441–450 publications: 25 scientists 451–460 publications: 32 scientists 461–470 publications: 29 scientists 471–480 publications: 21 scientists 481–490 publications: 26 scientists 491–500 publications: 26 scientists 501–510 publications: 17 scientists 511–520 publications: 19 scientists 521–530 publications: 15 scientists 531–540 publications: 22 scientists 541–550 publications: 12 scientists 551–560 publications: 15 scientists 561–570 publications: 11 scientists 571–580 publications: 19 scientists 581–590 publications: 9 scientists 591–600 publications: 9 scientists 601–610 publications: 7 scientists 611–620 publications: 11 scientists 621–630 publications: 5 scientists 631–640 publications: 5 scientists 641–650 publications: 6 scientists 651–660 publications: 3 scientists 661–670 publications: 3 scientists 671–680 publications: 4 scientists 681–689 publications: 4 scientists 690+ publications: 100 scientists
41 publications 690+

This scientist: 177 publications — 55th percentile

55% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 690 publications or more.

Keisuke Koba D-index placement in Environmental Sciences in 2026

The chart shows the D-index (discipline H-index) distribution of Environmental Sciences scientists ranked by Research.com in 2026. The highlighted bar marks where Keisuke Koba sits on this spectrum.

30 D-Index: 12 scientists 31 D-Index: 26 scientists 32 D-Index: 51 scientists 33 D-Index: 88 scientists 34 D-Index: 123 scientists 35 D-Index: 163 scientists 36 D-Index: 206 scientists 37 D-Index: 267 scientists 38 D-Index: 265 scientists 39 D-Index: 275 scientists 40 D-Index: 321 scientists 41 D-Index: 343 scientists 42 D-Index: 305 scientists 43 D-Index: 336 scientists 44 D-Index: 330 scientists 45 D-Index: 348 scientists 46 D-Index: 291 scientists 47 D-Index: 275 scientists 48 D-Index: 272 scientists 49 D-Index: 273 scientists 50 D-Index: 263 scientists 51 D-Index: 232 scientists 52 D-Index: 266 scientists 53 D-Index: 217 scientists 54 D-Index: 198 scientists 55 D-Index: 177 scientists 56 D-Index: 202 scientists 57 D-Index: 204 scientists 58 D-Index: 166 scientists 59 D-Index: 177 scientists 60 D-Index: 166 scientists 61 D-Index: 152 scientists 62 D-Index: 143 scientists 63 D-Index: 150 scientists 64 D-Index: 124 scientists 65 D-Index: 119 scientists 66 D-Index: 120 scientists 67 D-Index: 118 scientists 68 D-Index: 82 scientists 69 D-Index: 98 scientists 70 D-Index: 94 scientists 71 D-Index: 105 scientists 72 D-Index: 74 scientists 73 D-Index: 84 scientists 74 D-Index: 70 scientists 75 D-Index: 67 scientists 76 D-Index: 78 scientists 77 D-Index: 60 scientists 78 D-Index: 59 scientists 79 D-Index: 52 scientists 80 D-Index: 47 scientists 81 D-Index: 38 scientists 82 D-Index: 48 scientists 83 D-Index: 42 scientists 84 D-Index: 42 scientists 85 D-Index: 43 scientists 86 D-Index: 29 scientists 87 D-Index: 37 scientists 88 D-Index: 29 scientists 89 D-Index: 30 scientists 90 D-Index: 34 scientists 91 D-Index: 20 scientists 92 D-Index: 22 scientists 93 D-Index: 17 scientists 94 D-Index: 19 scientists 95 D-Index: 24 scientists 96 D-Index: 21 scientists 97 D-Index: 20 scientists 98 D-Index: 24 scientists 99 D-Index: 17 scientists 100 D-Index: 17 scientists 101 D-Index: 21 scientists 102 D-Index: 25 scientists 103 D-Index: 18 scientists 104 D-Index: 26 scientists 105 D-Index: 20 scientists 106 D-Index: 15 scientists 107 D-Index: 10 scientists 108 D-Index: 13 scientists 109 D-Index: 15 scientists 110 D-Index: 12 scientists 111 D-Index: 8 scientists 112 D-Index: 7 scientists 113 D-Index: 9 scientists 114 D-Index: 6 scientists 115 D-Index: 12 scientists 116 D-Index: 7 scientists 117 D-Index: 8 scientists 118 D-Index: 3 scientists 119 D-Index: 5 scientists 120 D-Index: 7 scientists 121 D-Index: 2 scientists 122 D-Index: 4 scientists 123 D-Index: 8 scientists 124 D-Index: 7 scientists 125 D-Index: 9 scientists 126+ D-Index: 92 scientists
30 D-Index 126+

This scientist: 53 D-Index — 57th percentile

57% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 126 D-Index or more.

Overview

Keisuke Koba is affiliated with Kyoto University in Japan. Their research primarily spans environmental science and agricultural and biological sciences, with a focus on ecology, soil science, plant science, nature and landscape conservation, and environmental chemistry.

Their work addresses several key topics including:

  • Soil Carbon and Nitrogen Dynamics
  • Isotope Analysis in Ecology
  • Peatlands and Wetlands Ecology
  • Soil and Water Nutrient Dynamics
  • Wastewater Treatment and Nitrogen Removal
  • Groundwater and Isotope Geochemistry
  • Plant nutrient uptake and metabolism

Keisuke Koba has contributed to multiple scientific publications. Some recent papers include:

  • Retention of deposited ammonium and nitrate and its impact on the global forest carbon sink, 2022, Nature Communications
  • Multiyear Measurements on Δ17O of Stream Nitrate Indicate High Nitrate Production in a Temperate Forest, 2020, Environmental Science & Technology
  • Mature conifers assimilate nitrate as efficiently as ammonium from soils in four forest plantations, 2020, New Phytologist
  • An internal recycling mechanism between ammonia/ammonium and nitrate driven by ammonia-oxidizing archaea and bacteria (AOA, AOB, and Comammox) and DNRA on Angkor sandstone monuments, 2021, International Biodeterioration & Biodegradation
  • Perspective: sustainability challenges, opportunities and solutions for long-term ecosystem observations, 2023, Philosophical Transactions of the Royal Society B Biological Sciences

Their publications frequently appear in venues such as:

  • Environmental Science & Technology
  • Scientific Reports
  • Ecological Research
  • Zenodo (CERN European Organization for Nuclear Research)
  • Nature Communications

Keisuke Koba has collaborated with various researchers, with frequent co-authors including:

  • Yuji Onishi
  • Keitaro Fukushima
  • Yunting Fang
  • Akiko Makabe
  • Midori Yano

Best Publications

  • Ecological interpretations of nitrogen isotope ratios of terrestrial plants and soils

    Joseph M. Craine;E. N. J. Brookshire;Michael D. Cramer;Niles J. Hasselquist

  • Hadal biosphere: Insight into the microbial ecosystem in the deepest ocean on Earth

    Takuro Nunoura;Yoshihiro Takaki;Miho Hirai;Shigeru Shimamura

  • Higher diversity and abundance of denitrifying microorganisms in environments than considered previously.

    Wei Wei;Kazuo Isobe;Tomoyasu Nishizawa;Lin Zhu

  • Nitrogen deposition and forest nitrogen cycling along an urban-rural transect in southern China

    Yunting Fang;Yunting Fang;Muneoki Yoh;Keisuke Koba;Weixing Zhu

  • Microbial denitrification dominates nitrate losses from forest ecosystems

    Yunting Fang;Keisuke Koba;Akiko Makabe;Chieko Takahashi

  • Natural 13C and 15N abundance of field‐collected fungi and their ecological implications

    A. Kohzu;T. Yoshioka;T. Ando;M. Takahashi

  • Isotopocule analysis of biologically produced nitrous oxide in various environments

    Sakae Toyoda;Naohiro Yoshida;Keisuke Koba

  • Convergence of soil nitrogen isotopes across global climate gradients

    Joseph M. Craine;Andrew J. Elmore;Lixin Wang;Laurent Augusto

  • Intermittent denitrification: The application of a 15N natural abundance method to a forested ecosystem

    Keisuke Koba;Naoko Tokuchi;Eitaro Wada;Takuo Nakajima

  • Anthropogenic imprints on nitrogen and oxygen isotopic composition of precipitation nitrate in a nitrogen-polluted city in southern China

    Y. T. Fang;Y. T. Fang;K. Koba;X. M. Wang;D. Z. Wen

  • Role of nitrification and denitrification on the nitrous oxide cycle in the eastern tropical North Pacific and Gulf of California

    Hiroaki Yamagishi;Marian B. Westley;Marian B. Westley;Brian N. Popp;Sakae Toyoda

  • Retention of deposited ammonium and nitrate and its impact on the global forest carbon sink

    Unknown

  • Characterization and production and consumption processes of N2O emitted from temperate agricultural soils determined via isotopomer ratio analysis

    Sakae Toyoda;Midori Yano;Sei-ichi Nishimura;Hiroko Akiyama

  • Nitrate is an important nitrogen source for Arctic tundra plants.

    Xue Yan Liu;Xue Yan Liu;Keisuke Koba;Keisuke Koba;Lina A. Koyama;Sarah E. Hobbie

  • WATER UTILIZATION OF NATURAL AND PLANTED TREES IN THE SEMIARID DESERT OF INNER MONGOLIA, CHINA

    Nobuhito Ohte;Keisuke Koba;Ken Yoshikawa;Atsuko Sugimoto

  • Natural abundance of nitrogen-15 in a forest soil

    Keisuke Koba;Naoko Tokuchi;Takahito Yoshioka;Erik Alan Hobbie

  • High abundance of ammonia-oxidizing archaea in acidified subtropical forest soils in southern China after long-term N deposition

    Kazuo Isobe;Keisuke Koba;Yuichi Suwa;Junko Ikutani

  • Stable isotope analyses of precipitation nitrogen sources in Guiyang, southwestern China.

    Xue-Yan Liu;Xue-Yan Liu;Xue-Yan Liu;Hong-Wei Xiao;Hua-Yun Xiao;Wei Song

  • Atmospheric deposition and leaching of nitrogen in Chinese forest ecosystems

    Yunting Fang;Yunting Fang;Per Gundersen;Rolf D. Vogt;Keisuke Koba

  • Nitrogen Fixation in Surface Soils and Vegetation in an Arctic Tundra Watershed: A Key Source of Atmospheric Nitrogen

    Satoru Hobara;Carmody McCalley;Keisuke Koba;Anne E. Giblin

  • Biogeochemistry of nitrous oxide in groundwater in a forested ecosystem elucidated by nitrous oxide isotopomer measurements

    K. Koba;K. Koba;K. Osaka;Y. Tobari;S. Toyoda

  • Natural 13C and 15N abundance of field-collected fungi and their ecological

    A. KOHZUl;T. Yoshioka;T. Ando;M. Takahashi

Frequent Co-Authors

Nobuhito Ohte
Nobuhito Ohte Kyoto University
Yunting Fang
Yunting Fang Chinese Academy of Sciences
Naohiro Yoshida
Naohiro Yoshida Tokyo Institute of Technology
Naoko Tokuchi
Naoko Tokuchi Kyoto University
Ryunosuke Tateno
Ryunosuke Tateno Kyoto University
Cong-Qiang Liu
Cong-Qiang Liu Tianjin University
Jiangming Mo
Jiangming Mo Chinese Academy of Sciences
Toshi Nagata
Toshi Nagata University of Tokyo
Erik A. Hobbie
Erik A. Hobbie University of New Hampshire
Takashi Osono
Takashi Osono Doshisha University

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