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Takayoshi Koike

Takayoshi Koike

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Plant Science and Agronomy 59 1279 1172 38 38 340 11926

Takayoshi Koike publications per year

The chart shows the history of publications by Takayoshi Koike between 1984 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Takayoshi Koike published across 42 years, from 1984 to 2025, averaging 9.3 papers a year. Output peaked at 24 publications in 2005. 11 of the 391 publications appeared in the last two years.

No. of publications
5 10 15 20
Bar chart. Horizontal axis: year, 1984 to 2025. Vertical axis: number of publications, 0 to 24. Peak 24 publications in 2005. 1984: 2 publications 1985: 1 publication 1986: 1 publication 1987: 0 publications 1988: 1 publication 1989: 1 publication 1990: 1 publication 1991: 0 publications 1992: 1 publication 1993: 1 publication 1994: 1 publication 1995: 4 publications 1996: 6 publications 1997: 8 publications 1998: 4 publications 1999: 2 publications 2000: 8 publications 2001: 7 publications 2002: 10 publications 2003: 15 publications 2004: 16 publications 2005: 24 publications 2006: 22 publications 2007: 15 publications 2008: 13 publications 2009: 12 publications 2010: 22 publications 2011: 17 publications 2012: 22 publications 2013: 10 publications 2014: 9 publications 2015: 18 publications 2016: 17 publications 2017: 12 publications 2018: 14 publications 2019: 13 publications 2020: 11 publications 2021: 10 publications 2022: 16 publications 2023: 13 publications 2024: 10 publications 2025: 1 publication
1984 2025

391 publications in total across all disciplines

View publications per year as a table
Takayoshi Koike: publications per year, 1984 to 2025
Year Publications
1984 2
1985 1
1986 1
1987 0
1988 1
1989 1
1990 1
1991 0
1992 1
1993 1
1994 1
1995 4
1996 6
1997 8
1998 4
1999 2
2000 8
2001 7
2002 10
2003 15
2004 16
2005 24
2006 22
2007 15
2008 13
2009 12
2010 22
2011 17
2012 22
2013 10
2014 9
2015 18
2016 17
2017 12
2018 14
2019 13
2020 11
2021 10
2022 16
2023 13
2024 10
2025 1
Total 391
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Takayoshi Koike publication distribution in Plant Science and Agronomy in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Plant Science and Agronomy in 2026. The highlighted bar marks where Takayoshi Koike sits on this spectrum.

No. of scientists
50 100 150 200 250
Bar chart with 88 bars. Horizontal axis: publications, 36–40 to 467+. Vertical axis: number of scientists, 0 to 255. Most scientists, 255, have 111–115 publications. The last bar groups every scientist with 467 publications or more. The highlighted bar, 336–340 publications, is where this scientist sits. 36–40 publications: 2 scientists 41–45 publications: 7 scientists 46–50 publications: 40 scientists 51–55 publications: 58 scientists 56–60 publications: 60 scientists 61–65 publications: 107 scientists 66–70 publications: 130 scientists 71–75 publications: 153 scientists 76–80 publications: 191 scientists 81–85 publications: 199 scientists 86–90 publications: 206 scientists 91–95 publications: 218 scientists 96–100 publications: 226 scientists 101–105 publications: 227 scientists 106–110 publications: 247 scientists 111–115 publications: 255 scientists 116–120 publications: 253 scientists 121–125 publications: 233 scientists 126–130 publications: 219 scientists 131–135 publications: 201 scientists 136–140 publications: 194 scientists 141–145 publications: 176 scientists 146–150 publications: 157 scientists 151–155 publications: 147 scientists 156–160 publications: 151 scientists 161–165 publications: 159 scientists 166–170 publications: 137 scientists 171–175 publications: 128 scientists 176–180 publications: 126 scientists 181–185 publications: 98 scientists 186–190 publications: 114 scientists 191–195 publications: 100 scientists 196–200 publications: 90 scientists 201–205 publications: 71 scientists 206–210 publications: 98 scientists 211–215 publications: 70 scientists 216–220 publications: 86 scientists 221–225 publications: 61 scientists 226–230 publications: 58 scientists 231–235 publications: 53 scientists 236–240 publications: 64 scientists 241–245 publications: 39 scientists 246–250 publications: 46 scientists 251–255 publications: 51 scientists 256–260 publications: 36 scientists 261–265 publications: 44 scientists 266–270 publications: 35 scientists 271–275 publications: 30 scientists 276–280 publications: 33 scientists 281–285 publications: 35 scientists 286–290 publications: 36 scientists 291–295 publications: 26 scientists 296–300 publications: 26 scientists 301–305 publications: 31 scientists 306–310 publications: 30 scientists 311–315 publications: 21 scientists 316–320 publications: 29 scientists 321–325 publications: 14 scientists 326–330 publications: 15 scientists 331–335 publications: 15 scientists 336–340 publications: 17 scientists 341–345 publications: 15 scientists 346–350 publications: 12 scientists 351–355 publications: 17 scientists 356–360 publications: 18 scientists 361–365 publications: 12 scientists 366–370 publications: 11 scientists 371–375 publications: 6 scientists 376–380 publications: 6 scientists 381–385 publications: 11 scientists 386–390 publications: 9 scientists 391–395 publications: 10 scientists 396–400 publications: 8 scientists 401–405 publications: 4 scientists 406–410 publications: 9 scientists 411–415 publications: 11 scientists 416–420 publications: 4 scientists 421–425 publications: 7 scientists 426–430 publications: 4 scientists 431–435 publications: 3 scientists 436–440 publications: 5 scientists 441–445 publications: 8 scientists 446–450 publications: 6 scientists 451–455 publications: 7 scientists 456–460 publications: 5 scientists 461–465 publications: 6 scientists 466 publications: 2 scientists 467+ publications: 99 scientists
36–40 publications 467+

This scientist: 340 publications — 95th percentile

95% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 467 publications or more.

View publications distribution as a table
Number of Plant Science and Agronomy scientists by publication count, Research.com 2026 ranking edition. Based on 6,494 ranked scientists.
Publications Scientists This scientist
36–40 2
41–45 7
46–50 40
51–55 58
56–60 60
61–65 107
66–70 130
71–75 153
76–80 191
81–85 199
86–90 206
91–95 218
96–100 226
101–105 227
106–110 247
111–115 255
116–120 253
121–125 233
126–130 219
131–135 201
136–140 194
141–145 176
146–150 157
151–155 147
156–160 151
161–165 159
166–170 137
171–175 128
176–180 126
181–185 98
186–190 114
191–195 100
196–200 90
201–205 71
206–210 98
211–215 70
216–220 86
221–225 61
226–230 58
231–235 53
236–240 64
241–245 39
246–250 46
251–255 51
256–260 36
261–265 44
266–270 35
271–275 30
276–280 33
281–285 35
286–290 36
291–295 26
296–300 26
301–305 31
306–310 30
311–315 21
316–320 29
321–325 14
326–330 15
331–335 15
336–340 17 340
341–345 15
346–350 12
351–355 17
356–360 18
361–365 12
366–370 11
371–375 6
376–380 6
381–385 11
386–390 9
391–395 10
396–400 8
401–405 4
406–410 9
411–415 11
416–420 4
421–425 7
426–430 4
431–435 3
436–440 5
441–445 8
446–450 6
451–455 7
456–460 5
461–465 6
466 2
467+ 99
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Takayoshi Koike D-index placement in Plant Science and Agronomy in 2026

The chart shows the D-index (discipline H-index) distribution of Plant Science and Agronomy scientists ranked by Research.com in 2026. The highlighted bar marks where Takayoshi Koike sits on this spectrum.

No. of scientists
50 100 150 200 250
Bar chart with 80 bars. Horizontal axis: D-Index, 30 to 109+. Vertical axis: number of scientists, 0 to 288. Most scientists, 288, have 34 D-Index. The last bar groups every scientist with 109 D-Index or more. The highlighted bar, 59 D-Index, is where this scientist sits. 30 D-Index: 200 scientists 31 D-Index: 236 scientists 32 D-Index: 253 scientists 33 D-Index: 283 scientists 34 D-Index: 288 scientists 35 D-Index: 240 scientists 36 D-Index: 246 scientists 37 D-Index: 243 scientists 38 D-Index: 247 scientists 39 D-Index: 229 scientists 40 D-Index: 232 scientists 41 D-Index: 230 scientists 42 D-Index: 228 scientists 43 D-Index: 219 scientists 44 D-Index: 193 scientists 45 D-Index: 164 scientists 46 D-Index: 158 scientists 47 D-Index: 143 scientists 48 D-Index: 131 scientists 49 D-Index: 127 scientists 50 D-Index: 122 scientists 51 D-Index: 122 scientists 52 D-Index: 110 scientists 53 D-Index: 102 scientists 54 D-Index: 98 scientists 55 D-Index: 79 scientists 56 D-Index: 85 scientists 57 D-Index: 88 scientists 58 D-Index: 91 scientists 59 D-Index: 62 scientists 60 D-Index: 61 scientists 61 D-Index: 59 scientists 62 D-Index: 54 scientists 63 D-Index: 61 scientists 64 D-Index: 59 scientists 65 D-Index: 58 scientists 66 D-Index: 41 scientists 67 D-Index: 49 scientists 68 D-Index: 39 scientists 69 D-Index: 32 scientists 70 D-Index: 40 scientists 71 D-Index: 47 scientists 72 D-Index: 38 scientists 73 D-Index: 28 scientists 74 D-Index: 29 scientists 75 D-Index: 28 scientists 76 D-Index: 22 scientists 77 D-Index: 21 scientists 78 D-Index: 25 scientists 79 D-Index: 26 scientists 80 D-Index: 19 scientists 81 D-Index: 16 scientists 82 D-Index: 12 scientists 83 D-Index: 16 scientists 84 D-Index: 14 scientists 85 D-Index: 11 scientists 86 D-Index: 17 scientists 87 D-Index: 13 scientists 88 D-Index: 10 scientists 89 D-Index: 12 scientists 90 D-Index: 18 scientists 91 D-Index: 16 scientists 92 D-Index: 16 scientists 93 D-Index: 17 scientists 94 D-Index: 12 scientists 95 D-Index: 8 scientists 96 D-Index: 9 scientists 97 D-Index: 9 scientists 98 D-Index: 11 scientists 99 D-Index: 12 scientists 100 D-Index: 5 scientists 101 D-Index: 8 scientists 102 D-Index: 4 scientists 103 D-Index: 11 scientists 104 D-Index: 5 scientists 105 D-Index: 9 scientists 106 D-Index: 7 scientists 107 D-Index: 4 scientists 108 D-Index: 8 scientists 109+ D-Index: 99 scientists
30 D-Index 109+

This scientist: 59 D-Index — 81st percentile

81% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 109 D-Index or more.

View D-Index distribution as a table
Number of Plant Science and Agronomy scientists by D-index, Research.com 2026 ranking edition. Based on 6,494 ranked scientists.
D-Index Scientists This scientist
30 200
31 236
32 253
33 283
34 288
35 240
36 246
37 243
38 247
39 229
40 232
41 230
42 228
43 219
44 193
45 164
46 158
47 143
48 131
49 127
50 122
51 122
52 110
53 102
54 98
55 79
56 85
57 88
58 91
59 62 59
60 61
61 59
62 54
63 61
64 59
65 58
66 41
67 49
68 39
69 32
70 40
71 47
72 38
73 28
74 29
75 28
76 22
77 21
78 25
79 26
80 19
81 16
82 12
83 16
84 14
85 11
86 17
87 13
88 10
89 12
90 18
91 16
92 16
93 17
94 12
95 8
96 9
97 9
98 11
99 12
100 5
101 8
102 4
103 11
104 5
105 9
106 7
107 4
108 8
109+ 99
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Overview

What is he best known for?

The fields of study he is best known for:

  • Ecology
  • Botany
  • Ecosystem

Takayoshi Koike mainly investigates Botany, Photosynthesis, Photosynthetic capacity, Horticulture and Ecology. His studies in Betula platyphylla, Deciduous, Larch, Fagus crenata and Beech are all subfields of Botany research. His research investigates the connection between Deciduous and topics such as Ecological succession that intersect with problems in Broad-leaved tree.

His Chlorophyll fluorescence study, which is part of a larger body of work in Photosynthesis, is frequently linked to Light intensity, bridging the gap between disciplines. His research in Photosynthetic capacity intersects with topics in Shoot, Soil water, Picea glehnii and Transpiration. Takayoshi Koike studies Horticulture, namely Phytotoxicity.

His most cited work include:

  • Leaf Structure and Photosynthetic Performance as Related to the Forest Succession of Deciduous Broad‐Leaved Trees1 (276 citations)
  • Susceptibility to photoinhibition of three deciduous broadleaf tree species with different successional traits raised under various light regimes (147 citations)
  • Mixed-power scaling of whole-plant respiration from seedlings to giant trees (134 citations)

What are the main themes of his work throughout his whole career to date?

Takayoshi Koike mainly focuses on Botany, Photosynthesis, Horticulture, Larch and Agronomy. Many of his studies on Botany apply to Nutrient as well. The study incorporates disciplines such as Chlorophyll and Plant physiology in addition to Photosynthesis.

Takayoshi Koike has researched Horticulture in several fields, including Beech, Fagus crenata, Canopy and Growing season. His work investigates the relationship between Larch and topics such as Soil respiration that intersect with problems in Forestry. Takayoshi Koike has included themes like Soil water and Water content in his Agronomy study.

He most often published in these fields:

  • Botany (55.97%)
  • Photosynthesis (31.06%)
  • Horticulture (29.35%)

What were the highlights of his more recent work (between 2015-2021)?

  • Botany (55.97%)
  • Horticulture (29.35%)
  • Agronomy (17.41%)

In recent papers he was focusing on the following fields of study:

His scientific interests lie mostly in Botany, Horticulture, Agronomy, Photosynthesis and Larch. As part of one scientific family, Takayoshi Koike deals mainly with the area of Botany, narrowing it down to issues related to the Soil type, and often Soil classification. His Horticulture research is multidisciplinary, incorporating elements of Beech, Fagus crenata, Growing season, Photosynthetic capacity and Nutrient.

Many of his research projects under Agronomy are closely connected to Rhizosphere with Rhizosphere, tying the diverse disciplines of science together. His research integrates issues of Canopy, Chlorophyll, Deciduous and Plant physiology in his study of Photosynthesis. The Larch study combines topics in areas such as Taiga and Seedling.

Between 2015 and 2021, his most popular works were:

  • Nitrogen and phosphorus constrain the CO2 fertilization of global plant biomass (62 citations)
  • Climate change accelerates growth of urban trees in metropolises worldwide (55 citations)
  • A Review Study on Past 40 Years of Research on Effects of Tropospheric O3 on Belowground Structure, Functioning, and Processes of Trees: a Linkage with Potential Ecological Implications (50 citations)

In his most recent research, the most cited papers focused on:

  • Ecology
  • Botany
  • Ecosystem

Botany, Agronomy, Japonica, Photosynthesis and Horticulture are his primary areas of study. In the field of Botany, his study on Betula platyphylla, Phytotron and Pioneer species overlaps with subjects such as Volcanic ash and Chemical composition. His Agronomy study integrates concerns from other disciplines, such as Nutrient and Ectomycorrhizae.

His biological study spans a wide range of topics, including Larch, Grazing and Leaf beetle. His Photosynthesis research incorporates themes from Primary production, Acclimatization, Terrestrial ecosystem and Cycling. His studies deal with areas such as Willow, Organic matter, Soil water and Growing season as well as Horticulture.

Best Publications

  • Nitrogen and phosphorus constrain the CO2 fertilization of global plant biomass

    César Terrer;César Terrer;César Terrer;Robert B. Jackson;I. Colin Prentice;I. Colin Prentice;I. Colin Prentice;Trevor F. Keenan;Trevor F. Keenan

  • Leaf Structure and Photosynthetic Performance as Related to the Forest Succession of Deciduous Broad‐Leaved Trees1

    Takayoshi Koike

  • Susceptibility to photoinhibition of three deciduous broadleaf tree species with different successional traits raised under various light regimes

    M. Kitao;T. T. Lei;T. Koike;H. Tobita

  • Crown size and growing space requirement of common tree species in urban centres, parks, and forests

    Hans Pretzsch;Peter Biber;Enno Uhl;Jens Dahlhausen

  • Non-structural carbohydrates in woody plants compared among laboratories.

    Audrey G. Quentin;Audrey G. Quentin;Elizabeth A. Pinkard;Michael G. Ryan;Michael G. Ryan;David T. Tissue

  • Mixed-power scaling of whole-plant respiration from seedlings to giant trees

    S. Mori;K. Yamaji;A. Ishida;S. G. Prokushkin

  • Climate change accelerates growth of urban trees in metropolises worldwide

    Hans Pretzsch;Peter Biber;Enno Uhl;Jens Dahlhausen

  • Leaf morphology and photosynthetic adjustments among deciduous broad-leaved trees within the vertical canopy profile

    Takayoshi Koike;Mitsutoshi Kitao;Yutaka Maruyama;Shigeta Mori

  • Changes in photosynthesis and leaf characteristics with tree height in five dipterocarp species in a tropical rain forest.

    Tanaka Kenzo;Tomoaki Ichie;Yoko Watanabe;Reiji Yoneda

  • Chloroplast DNA phylogeography of Fagus crenata (Fagaceae) in Japan

    N. Fujii;N. Tomaru;K. Okuyama;T. Koike

  • In situ comparison of four approaches to estimating soil CO2 efflux in a northern larch (Larix kaempferi Sarg.) forest

    Naishen Liang;Toshie Nakadai;Takashi Hirano;Laiye Qu

  • Autumn coloring, photosynthetic performance and leaf development of deciduous broad-leaved trees in relation to forest succession.

    T. Koike

  • Causes and Consequences of Variation in Conifer Leaf Life-Span

    Peter B. Reich;Takayoshi Koike;Stith T. Gower;Anna W. Schoettle

  • Does the root to shoot ratio show a hormetic response to stress? An ecological and environmental perspective

    Evgenios Agathokleous;Regina G. Belz;Mitsutoshi Kitao;Takayoshi Koike

  • Variations in leaf β 13 C along a vertical profile of irradiance in a temperate Japanese forest.

    Y. T. Hanba;Shigeta Mori;Thomas T. Lei;Takayoshi Koike

  • Buried charcoal layer and ectomycorrhizae cooperatively promote the growth of Larix gmelinii seedlings

    K. Makoto;Y. Tamai;Y. S. Kim;T. Koike

  • Effects of manganese toxicity on photosynthesis of white birch (Betula platyphylla var. japonica) seedlings

    Mitsutoshi Kitao;Thomas T. Lei;Takayoshi Koike

  • Dynamic carbon dioxide exchange through snowpack by wind-driven mass transfer in a conifer-broadleaf mixed forest in northernmost Japan

    Kentaro Takagi;Mutsumi Nomura;Daitaro Ashiya;Hiroyuki Takahashi

  • Ozone-induced stomatal sluggishness changes carbon and water balance of temperate deciduous forests

    Yasutomo Hoshika;Genki Katata;Makoto Deushi;Makoto Watanabe

  • Effects of deicing salt on the vitality and health of two spruce species, Picea abies Karst., and Picea glehnii Masters planted along roadsides in northern Japan.

    M Kayama;A.M Quoreshi;S Kitaoka;Y Kitahashi

  • A Review Study on Past 40 Years of Research on Effects of Tropospheric O3 on Belowground Structure, Functioning, and Processes of Trees: a Linkage with Potential Ecological Implications

    Eugenios Agathokleous;Costas J. Saitanis;Xiaona Wang;Makoto Watanabe

Frequent Co-Authors

Makoto Watanabe
Makoto Watanabe Tokyo University of Agriculture and Technology
Mitsutoshi Kitao
Mitsutoshi Kitao Forestry and Forest Products Research Institute
Ryo Funada
Ryo Funada Tokyo University of Agriculture and Technology
Kentaro Takagi
Kentaro Takagi Hokkaido University
Hideaki Shibata
Hideaki Shibata Hokkaido University
Elena Paoletti
Elena Paoletti National Research Council (CNR)
Takashi Hirano
Takashi Hirano Hokkaido University
Tsutom Hiura
Tsutom Hiura University of Tokyo
William J. Manning
William J. Manning University of Massachusetts Amherst
Tohru Nakashizuka
Tohru Nakashizuka Tohoku University

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