World's Best Scientists 2026 revealed!
Kyoichi Otsuki

Kyoichi Otsuki

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Environmental Sciences 39 8417 8079 174 171 218 5324

Kyoichi Otsuki publications per year

The chart shows the history of publications by Kyoichi Otsuki between 1988 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Kyoichi Otsuki published across 38 years, from 1988 to 2025, averaging 5.8 papers a year. Output peaked at 22 publications in 2010. 4 of the 222 publications appeared in the last two years.

No. of publications
5 10 15 20
Bar chart. Horizontal axis: year, 1988 to 2025. Vertical axis: number of publications, 0 to 22. Peak 22 publications in 2010. 1988: 2 publications 1989: 0 publications 1990: 0 publications 1991: 1 publication 1992: 0 publications 1993: 2 publications 1994: 0 publications 1995: 2 publications 1996: 2 publications 1997: 7 publications 1998: 1 publication 1999: 4 publications 2000: 3 publications 2001: 1 publication 2002: 4 publications 2003: 3 publications 2004: 1 publication 2005: 6 publications 2006: 8 publications 2007: 9 publications 2008: 11 publications 2009: 14 publications 2010: 22 publications 2011: 14 publications 2012: 9 publications 2013: 14 publications 2014: 17 publications 2015: 17 publications 2016: 9 publications 2017: 9 publications 2018: 3 publications 2019: 6 publications 2020: 6 publications 2021: 1 publication 2022: 9 publications 2023: 1 publication 2024: 3 publications 2025: 1 publication
1988 2025

222 publications in total across all disciplines

View publications per year as a table
Kyoichi Otsuki: publications per year, 1988 to 2025
Year Publications
1988 2
1989 0
1990 0
1991 1
1992 0
1993 2
1994 0
1995 2
1996 2
1997 7
1998 1
1999 4
2000 3
2001 1
2002 4
2003 3
2004 1
2005 6
2006 8
2007 9
2008 11
2009 14
2010 22
2011 14
2012 9
2013 14
2014 17
2015 17
2016 9
2017 9
2018 3
2019 6
2020 6
2021 1
2022 9
2023 1
2024 3
2025 1
Total 222
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Kyoichi Otsuki 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 Kyoichi Otsuki sits on this spectrum.

No. of scientists
200 400 600
Bar chart with 66 bars. Horizontal axis: publications, 41–50 to 690+. Vertical axis: number of scientists, 0 to 617. Most scientists, 617, have 121–130 publications. The last bar groups every scientist with 690 publications or more. The highlighted bar, 211–220 publications, is where this scientist sits. 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
41–50 publications 690+

This scientist: 218 publications — 70th percentile

70% of scientists in this discipline score the same or lower.

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

View publications distribution as a table
Number of Environmental Sciences scientists by publication count, Research.com 2026 ranking edition. Based on 9,676 ranked scientists.
Publications Scientists This scientist
41–50 21
51–60 62
61–70 133
71–80 257
81–90 361
91–100 440
101–110 492
111–120 541
121–130 617
131–140 544
141–150 541
151–160 539
161–170 444
171–180 444
181–190 400
191–200 377
201–210 318
211–220 282 218
221–230 263
231–240 220
241–250 217
251–260 180
261–270 181
271–280 155
281–290 130
291–300 127
301–310 130
311–320 85
321–330 106
331–340 80
341–350 83
351–360 75
361–370 69
371–380 52
381–390 54
391–400 56
401–410 44
411–420 40
421–430 36
431–440 25
441–450 25
451–460 32
461–470 29
471–480 21
481–490 26
491–500 26
501–510 17
511–520 19
521–530 15
531–540 22
541–550 12
551–560 15
561–570 11
571–580 19
581–590 9
591–600 9
601–610 7
611–620 11
621–630 5
631–640 5
641–650 6
651–660 3
661–670 3
671–680 4
681–689 4
690+ 100
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Kyoichi Otsuki 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 Kyoichi Otsuki sits on this spectrum.

No. of scientists
100 200 300
Bar chart with 97 bars. Horizontal axis: D-Index, 30 to 126+. Vertical axis: number of scientists, 0 to 348. Most scientists, 348, have 45 D-Index. The last bar groups every scientist with 126 D-Index or more. The highlighted bar, 39 D-Index, is where this scientist sits. 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: 39 D-Index — 15th percentile

15% of scientists in this discipline score the same or lower.

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

View D-Index distribution as a table
Number of Environmental Sciences scientists by D-index, Research.com 2026 ranking edition. Based on 9,676 ranked scientists.
D-Index Scientists This scientist
30 12
31 26
32 51
33 88
34 123
35 163
36 206
37 267
38 265
39 275 39
40 321
41 343
42 305
43 336
44 330
45 348
46 291
47 275
48 272
49 273
50 263
51 232
52 266
53 217
54 198
55 177
56 202
57 204
58 166
59 177
60 166
61 152
62 143
63 150
64 124
65 119
66 120
67 118
68 82
69 98
70 94
71 105
72 74
73 84
74 70
75 67
76 78
77 60
78 59
79 52
80 47
81 38
82 48
83 42
84 42
85 43
86 29
87 37
88 29
89 30
90 34
91 20
92 22
93 17
94 19
95 24
96 21
97 20
98 24
99 17
100 17
101 21
102 25
103 18
104 26
105 20
106 15
107 10
108 13
109 15
110 12
111 8
112 7
113 9
114 6
115 12
116 7
117 8
118 3
119 5
120 7
121 2
122 4
123 8
124 7
125 9
126+ 92
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Overview

Kyoichi Otsuki is affiliated with Kyushu University in Japan and has contributed extensively to research in environmental science and agricultural and biological sciences. Their work spans numerous subfields, including global and planetary change, soil science, water science and technology, nature and landscape conservation, and plant science.

The scientist's research topics mainly revolve around plant water relations and carbon dynamics, soil erosion and sediment transport, hydrology and watershed management studies, forest ecology and management, hydrology and sediment transport processes, tree-ring climate responses, and tree root and stability studies.

Among their recent published papers are:

  • A global synthesis on the effects of thinning on hydrological processes: Implications for forest management, 2022, Forest Ecology and Management
  • Distinct transpiration characteristics of black locust plantations acclimated to semiarid and subhumid sites in the Loess Plateau, China, 2021, Agricultural Water Management
  • Characterization of dominant factors on evapotranspiration with seasonal soil water changes in two adjacent forests in the semiarid Loess Plateau, 2022, Journal of Hydrology
  • Relationship between Very Fine Root Distribution and Soil Water Content in Pre- and Post-Harvest Areas of Two Coniferous Tree Species, 2020, Forests
  • Stemflow estimation models for Japanese cedar and cypress plantations using common forest inventory data, 2020, Agricultural and Forest Meteorology

Their frequent co-authors include Seonghun Jeong, Norikazu Yamanaka, Sheng Du, Ayumi Katayama, and Masaaki Chiwa. These collaborations reflect an ongoing partnership with researchers contributing to overlapping areas of expertise.

Otsuki has published multiple articles in journals such as Forests, Ecohydrology, Forest Ecology and Management, Agricultural Water Management, and Journal of Hydrology. These venues confirm a consistent focus on environmental and hydrological sciences.

Best Publications

  • Sapflow characteristics and climatic responses in three forest species in the semiarid Loess Plateau region of China

    Sheng Du;Yi Long Wang;Tomonori Kume;Jian Guo Zhang

  • Experimental analysis of moisture dynamics of litter layers: the effects of rainfall conditions and leaf shapes

    Yoshinobu Sato;Tomo'omi Kumagai;Atsushi Kume;Kyoichi Otsuki

  • Comparison of litterfall production and leaf litter decomposition between an exotic black locust plantation and an indigenous oak forest near Yan’an on the Loess Plateau, China

    Ryunosuke Tateno;Naoko Tokuchi;Norikazu Yamanaka;Sheng Du

  • Forest ecohydrological research in the 21st century: what are the critical needs?

    James M. Vose;Ge Sun;Chelcy R. Ford;Michael Bredemeier

  • Transpiration and canopy conductance at two slope positions in a Japanese cedar forest watershed

    Tomo ' omi Kumagai;Makiko Tateishi;Takanori Shimizu;Kyoichi Otsuki

  • A global synthesis on the effects of thinning on hydrological processes: Implications for forest management

    Unknown

  • Sap flow estimates of stand transpiration at two slope positions in a Japanese cedar forest watershed

    Tomo'omi Kumagai;Sayaka Aoki;Takanori Shimizu;Kyoichi Otsuki

  • Effects of tree-to-tree and radial variations on sap flow estimates of transpiration in Japanese cedar

    Tomo ' omi Kumagai;Sayaka Aoki;Hisami Nagasawa;Tetsuya Mabuchi

  • Effect of forest structure on the spatial variation in soil respiration in a Bornean tropical rainforest

    Ayumi Katayama;Tomonori Kume;Hikaru Komatsu;Mizue Ohashi

  • Transport and retention of coarse woody debris in mountain streams: An in situ field experiment of log transport and a field survey of coarse woody debris distribution

    Hirokazu Haga;Tomo'omi Kumagai;Kyoichi Otsuki;Shigeru Ogawa

  • Spatial variations in xylem sap flux density in evergreen oak trees with radial-porous wood: comparisons with anatomical observations

    Makiko Tateishi;Tomo’omi Kumagai;Yasuhiro Utsumi;Toshihiro Umebayashi

  • Sources of error in estimating stand transpiration using allometric relationships between stem diameter and sapwood area for Cryptomeria japonica and Chamaecyparis obtusa

    Tomo ' omi Kumagai;Hisami Nagasawa;Tetsuya Mabuchi;Shigeru Ohsaki

  • Effects of sample size on sap flux-based stand-scale transpiration estimates

    Tomonori Kume;Kenji Tsuruta;Hikaru Komatsu;Tomo'omi Kumagai

  • The effect of converting a native broad-leaved forest to a coniferous plantation forest on annual water yield: A paired-catchment study in northern Japan

    Hikaru Komatsu;Tomonori Kume;Kyoichi Otsuki

  • Azimuthal and radial variations in sap flux density and effects on stand-scale transpiration estimates in a Japanese cedar forest.

    Yoshinori Shinohara;Kenji Tsuruta;Akira Ogura;Fumikazu Noto

  • Spatial variation in sap flow velocity in semiarid region trees: its impact on stand-scale transpiration estimates

    Tomonori Kume;Kyoichi Otsuki;Sheng Du;Norikazu Yamanaka

  • Relationship between annual rainfall and interception ratio for forests across Japan

    Hikaru Komatsu;Yoshinori Shinohara;Tomonori Kume;Kyoichi Otsuki

  • A model to estimate annual forest evapotranspiration in Japan from mean annual temperature

    Hikaru Komatsu;Eiichi Maita;Kyoichi Otsuki

  • Stand-scale transpiration estimates in a Moso bamboo forest: (I) Applicability of sap flux measurements

    Tomonori Kume;Yuka Onozawa;Hikaru Komatsu;Kenji Tsuruta

  • Stand-scale transpiration estimates in a Moso bamboo forest: II. Comparison with coniferous forests

    Hikaru Komatsu;Yuka Onozawa;Tomonori Kume;Kenji Tsuruta

  • Canopy conductance for a Moso bamboo (Phyllostachys pubescens) forest in western Japan

    Hikaru Komatsu;Hikaru Komatsu;Yuka Onozawa;Tomonori Kume;Kenji Tsuruta

  • Impact of stem water storage on diurnal estimates of whole-tree transpiration and canopy conductance from sap flow measurements in Japanese cedar and Japanese cypress trees.

    Tomo'omi Kumagai;Sayaka Aoki;Kyoichi Otsuki;Yasuhiro Utsumi

Frequent Co-Authors

Tomonori Kume
Tomonori Kume Kyushu University
Tomo'omi Kumagai
Tomo'omi Kumagai University of Tokyo
Yuichi Onda
Yuichi Onda University of Tsukuba
Baolin Xue
Baolin Xue Beijing Normal University
Takashi Gomi
Takashi Gomi Nagoya University
Taikan Oki
Taikan Oki University of Tokyo
Masakazu Suzuki
Masakazu Suzuki University of Tokyo
Hiroshi Sakugawa
Hiroshi Sakugawa Hiroshima University
Takeshi Ohta
Takeshi Ohta Nagoya University
Guobin Liu
Guobin Liu Chinese Academy of Sciences

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