2026 Hiroshi Koizumi: Plant Science and Agronomy Researcher – H-Index, Publications & Awards

Discipline name	D-Index	World Ranking	Current World Ranking	National Ranking	Current National Ranking	Publications	Citations
Plant Science and Agronomy	43	3303	3079	128	125	156	6090
Environmental Sciences	43	7185	6906	138	135	162	6169

Overview

Hiroshi Koizumi is affiliated with Waseda University in Japan, focusing their research primarily on environmental science and engineering. Their work spans key subfields such as nature and landscape conservation, soil science, computational mechanics, global and planetary change, and ecology.

The scientist has contributed extensively to topics including soil carbon and nitrogen dynamics, forest ecology and management, ecology and vegetation dynamics studies, plant water relations and carbon dynamics, peatlands and wetlands ecology, combustion and flame dynamics, and plant responses to elevated CO2.

Koizumi's recent publications include studies centered on forest ecosystems and environmental processes. Notable papers are:

Effects of the Application of Biochar to Plant Growth and Net Primary Production in an Oak Forest, 2021, published in Forests
Photosynthetic response of young oaks to biochar amendment in field conditions over 3 years, 2021, published in Journal of Forest Research
Comparison of inter-annual variation in net primary production among three forest types in the same region over 7 years, 2020, published in Journal of Forest Research
Composite effects of temperature increase and snow cover change on litter decomposition and microbial community in cool-temperate grassland, 2020, published in Grassland Science
Direct Measurement of Near-Wall Molecular Transport Rate in a Microchannel and Its Dependence on Diffusivity, 2021, published in Langmuir

Frequent co-authors in Koizumi's research include Shinpei Yoshitake, Toshiyuki Ohtsuka, Mitsutoshi Tomotsune, Y. Tsukimori, and Yasuo Iimura, indicating ongoing collaborations within related research areas.

The scientist has been published multiple times in prominent venues such as Forests, Journal of Forest Research, SSRN Electronic Journal, Bioscience Biotechnology and Biochemistry, and Grassland Science.

Koizumi's research addresses important ecological and environmental science issues through interdisciplinary approaches combining field studies and computational methods. The work contributes to understanding carbon dynamics in soil and plant systems, vegetation ecology, and the effects of environmental changes on ecosystems.

Best Publications

Seasonal changes in the contribution of root respiration to total soil respiration in a cool-temperate deciduous forest

Mi Sun Lee;Kaneyuki Nakane;Takayuki Nakatsubo;Hiroshi Koizumi

362
Citations
Differences in soil respiration between different tropical ecosystems

Minako Adachi;Yukiko Sakata Bekku;Wan Rashidah;Toshinori Okuda

259
Citations
Effect of warming on the temperature dependence of soil respiration rate in arctic, temperate and tropical soils

Yukiko Sakata Bekku;Takayuki Nakatsubo;Atsushi Kume;Minako Adachi

207
Citations
Examination of four methods for measuring soil respiration

Y. Bekku;Hiroshi Koizumi;T. Oikawa;H. Iwaki

198
Citations
Seasonal and annual variations in soil respiration in a cool-temperate deciduous broad-leaved forest in Japan

Wenhong Mo;Mi Sun Lee;Masaki Uchida;Motoko Inatomi

194
Citations
Effects of rainfall events on soil CO2 flux in a cool temperate deciduous broad-leaved forest

Mi Sun Lee;Kaneyuki Nakane;Takayuki Nakatsubo;Wen Hong Mo

177
Citations
Contributions of diffusional limitation, photoinhibition and photorespiration to midday depression of photosynthesis in Arisaema heterophyllum in natural high light

Hiroyuki Muraoka;Yanhong Tang;Ichiro Terashima;Hiroshi Koizumi

160
Citations
Photosynthetic and structural characteristics of canopy and shrub trees in a cool-temperate deciduous broadleaved forest: Implication to the ecosystem carbon gain

Hiroyuki Muraoka;Hiroshi Koizumi

148
Citations
Effects of seasonal and interannual variations in leaf photosynthesis and canopy leaf area index on gross primary production of a cool-temperate deciduous broadleaf forest in Takayama, Japan.

Hiroyuki Muraoka;Nobuko Saigusa;Kenlo N. Nasahara;Hibiki Noda

142
Citations
Carbon and nitrogen limitation of soil microbial respiration in a High Arctic successional glacier foreland near Ny-Ålesund, Svalbard

Shinpei Yoshitake;Masaki Uchida;Hiroshi Koizumi;Takayuki Nakatsubo

128
Citations
The effects of logging on soil greenhouse gas (CO2, CH4, N2O) flux in a tropical rain forest, Peninsular Malaysia

Yuichiro Yashiro;Wan Rashidah Kadir;Toshinori Okuda;Hiroshi Koizumi

126
Citations
Production of biological soil crusts in the early stage of primary succession on a high Arctic glacier foreland.

Shinpei Yoshitake;Masaki Uchida;Hiroshi Koizumi;Hiroshi Kanda

124
Citations
Required sample size for estimating soil respiration rates in large areas of two tropical forests and of two types of plantation in Malaysia

Minako Adachi;Yukiko Sakata Bekku;Akihiro Konuma;Wan Rasidah Kadir

123
Citations
Microbial activity and litter decomposition under snow cover in a cool-temperate broad-leaved deciduous forest

Masaki Uchida;Wenhong Mo;Takayuki Nakatsubo;Yuki Tsuchiya

115
Citations
Measurement of soil respiration using closed chamber method: An IRGA technique

Yukiko Bekku;Hiroshi Koizumi;Toshie Nakadai;Hideo Iwaki

111
Citations
Carbon dynamics and budget in a Miscanthus sinensis grassland in Japan

Yukihiro Yazaki;Shigeru Mariko;Hiroshi Koizumi

107
Citations
Biometric based estimates of net primary production (NPP) in a cool-temperate deciduous forest stand beneath a flux tower

Toshiyuki Ohtsuka;Tsuyoshi Akiyama;Yasushi Hashimoto;Motoko Inatomi

106
Citations
On linking multiyear biometric measurements of tree growth with eddy covariance‐based net ecosystem production

Toshiyuki Ohtsuka;Nobuko Saigusa;Hiroshi Koizumi

105
Citations
Winter CO2 flux from soil and snow surfaces in a cool-temperate deciduous forest, Japan.

Shigeru Mariko;Noboru Nishimura;Wenhong Mo;Yoshisuke Matsui

104
Citations
Biometric Based Carbon Flux Measurements and Net Ecosystem Production (NEP) in a Temperate Deciduous Broad-Leaved Forest Beneath a Flux Tower

Toshiyuki Ohtsuka;Wenhong Mo;Takami Satomura;Motoko Inatomi

99
Citations
Satellite Ecology (SATECO)-linking ecology, remote sensing and micrometeorology, from plot to regional scale, for the study of ecosystem structure and function.

Hiroyuki Muraoka;Hiroshi Koizumi

97
Citations