Kei Koba's website in CER, Kyoto University ~ Ecosystems Ecology with Isotope Techniques ~

Peer-reviewed papers in English (Updated on 26th August, 2023); Google Scholar --> Here, Web of Science, Researcher ID --> Here



115. A. Medo, N. Ohte, H. Kajitani, T. Nose, Y. Manabe, T. Sugawara, Y. Onishi, A. S. Goto, K. Koba, N. Arai, Y. Mitsunaga, M. Kume, H. Nishizawa, D. Kojima, A. Yokoyama, T. Yamanaka, T. Viputhanumas and H. Mitamura. 2023.
Striped catfish (Pangasianodon hypophthalmus) exploit food sources across anaerobic decomposition- and primary photosynthetic production-based food chains.
Scientific Reports 13:13992--> abstract

114. Y. Onishi, T. Yamanaka and K. Koba. 2023.
Major contribution of sulfide-derived sulfur to the benthic food web in a large freshwater lake.
Geobiology 21:671-685--> abstract

113. A. S. Mori, K. F. Suzuki, M. Hori, T. Kadoya, K. Okano, A. Uraguchi, H. Muraoka, T. Sato, H. Shibata, Y. Suzuki-Ohno, K. Koba, M. Toda, S. Nakano, M. Kondoh, K. Kitajima and M. Nakamura. 2023.
Perspective: sustainability challenges, opportunities and solutions for long-term ecosystem observations.
Philosophical Transactions of the Royal Society B 378:20220192--> abstract

112. J. Zheng, K. Fujii, K. Koba, W. Wanek, C. Muller, A. B. Jansen-Willems, Y. Nakajima, R. Wagai, and A. Canarini. 2023.
Revisiting process-based simulations of soil nitrite dynamics: Tighter cycling between nitrite and nitrate than considered previously.
Soil Biology and Biochemistry 178:108958--> abstract

111. A. Kurasawa, Y. Onishi, K. Koba, K. Fukushima, and H. Uno. 2023.
Multipath ecological influence of an iteroparous fish migration from Lake Biwa to an alluvial stream.
Freshwater Biology 68(8):1400-1412 --> abstract



[ K. Koba. 2022.]
Missing flux from the ocean: isotope revealed an important NOx flux mediated by microbial processes.
National Science Review 9(9):nwac142 --> abstract

110. G. A. Gurmesa, E. A. Hobbie, S. Zhang, A. Wang, F. Zhu, W. Zhu, K. Koba, M. Yoh, C. Wang, Q. Zhang, and Y. Fang. 2022.
Natural 15N abundance of ammonium and nitrate in soil profiles: New insights into forest ecosystem nitrogen saturation.
Ecosphere 2022:13:e3998 --> abstract

109. G. A. Gurmesa, A. Wang, S. Li, S. Peng, W. de Vries, P. Gundersen, P. Ciais, O. L. Phillips, E. A Hobbie, W. Zhu, K. Nadelhoffer, Y. Xi, E. Bai, T. Sun, D. Chen, W. Zhou, Y. Zhang, Y. Guo, J. Zhu, L. Duan, D. Li, K. Koba, E. Du, G. Zhou, X. Han, S. Han, and Y. Fang. 2022.
Retention of deposited ammonium and nitrate and its impact on the global forest carbon sink.
Nature Communications 13:880 --> abstract



108. S.-Q. Xu, X.-Y. Liu, Z.-C. Sun, C.-C. Hu, W. Wanek, and K. Koba. 2021.
Isotopic Elucidation of Microbial Nitrogen Transformations in Forest Soils.
Global Biogeochemical Cycles 35(12) :December 2021 e2021GB007070 --> abstract

107. C.-J. Chen, X.-Y. Liu, X.-W. Wang, C.-C. Hu, S.-Q. Xu, R. Mao, Z.-. Bu, Y.-T. Fang, and K. Koba. 2021.
Different leaf carbon, nitrogen, and phosphorus stoichiometry and carbon and nitrogen isotopes among peatland plants in northeastern China.
Plant and Soil 467:345-357 --> abstract

106. X. Ding, W. Lan, Y. Li, A. Yan, Y. Katayama, K. Koba, A. Makabe, K. Fukushima, M. Yano, Y. Onishi, Q. Ge, and J-D. Gu. 2021.
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.
International Biodeterioration & Biodegradation 165: 105328    --> abstract

105. C. Tatsumi, F. Hyodo, T. Taniguchi, W. Shi, K. Koba, K. Fukushima, S. Du, N. Yamanaka, P. Templer, and R. Tateno 2021.
Arbuscular Mycorrhizal Community in Roots and Nitrogen Uptake Patterns of Understory Trees Beneath Ectomycorrhizal and Non-ectomycorrhizal Overstory Trees.
Frontiers in Plant Science 11:583585. doi: 10.3389/fpls.2020.583585 --> abstract

104. W. Wei, K. Isobe, Y. Shiratori, M. Yano, S. Toyoda, K. Koba, N. Yoshida, H. Shen, and K. Senoo. 2021.
Revisiting the involvement of ammonia oxidizers and denitrifiers in nitrous oxide emission from cropland soils.
Environmental Pollution 287:117494 --> abstract

103. F. Hyodo, Y. Takebayashi, A. Makabe, D. A. Wardle, and  K. Koba. 2021.
Changes in stable nitrogen isotopes of plants, bulk soil and soil dissolved N during ecosystem retrogression in boreal forest.
Ecological Research 36(3):420-429 --> abstract

102. X. Zhou, A. Wang, E. A. Hobbie, F. Zhu, Y. Qu, L. Dai, D. Li, X. Liu, W. Zhu, K. Koba, Y. Li, and Y. Fang. 2021.
Mature conifers assimilate nitrate as efficiently as ammonium from soils in four forest plantations.
New Phytologist 229(6):3184-3194 --> abstract

101. Y. Seko, K. Hashimoto, K. Koba, D. Hayasaka, and T. Sawahata. 2021.
Intraspecific differences in the invasion success of the Argentine ant Linepithema humile Mayr are associated with diet breadth.
Scientific Reports 11:2874 --> abstract

100. K. Kobayashi, K. Fukushima, Y. Onishi, K. Nishina, A. Makabe, M. Yano, S. D. Wankel, K. Koba, and S. Okabe. 2021.
Influence of δ18O of water on measurements of δ18O of nitrite and nitrate.
Rapid Communications in Mass Spectrometry 35:e8979 --> abstract



99. S. Kotajima, K. Koba*, D. Ikeda, A. Terada, K. Isaka, K. Nishina, Y. Kimura, A. Makabe, M. Yano, H. Fujitani, N. Ushiki, S. Tsuneda, and M. Yoh. 2020.
Nitrogen and oxygen isotope signatures of nitrogen compounds during anammox in the lab and in a wastewater treatment plant.
Microbes and Environments 35(4), doi:10.1264/jsme2.ME20031 --> abstract

98. X.‐Y. Liu, D. Wu, X. Song, Y.‐P. Dong, C.‐J. Chen, W. Song, C.‐Q. Liu, and K. Koba. 2020.
A Non‐steady State Model Based on Dual Nitrogen and Oxygen Isotopes to Constrain Moss Nitrate Uptake and Reduction.
Journal of Geophysical Research: Biogeosciences 125: e2019JG005498. --> abstract

97. R. Tateno, M. Nakayama, M. Yano, K. Fukuzawa, Y. Inagaki, K. Koba, and S. Ugawa. 2020.
Nitrogen source utilization in co-existing canopy tree and dwarf bamboo in a northern hardwood forest in Japan.
Trees 34 : 1047-1057. --> abstract

96. D. T. Nhu Y, N. T. Hoang, P. K. Lieu, H. Harada, K. Koba, N. Brion, D. V. Hieu, N. V. Hop, T. Sieren, and  H. O. Venterink. 2020.
Interspecific variation in foliar nutrients and isotopes of submerged macrophytes in the Cau Hai Lagoon, the typical brackish lagoon in Vietnam.
Botanica Pacifica  9(1) : 131-138. --> abstract

95. S. Huang, F. Wang, E. M. Elliott, F. Zhu, W. Zhu, K. Koba, Z. Yu, E. A. Hobbie, G. Michalski, R. Kang, A. Wang, J. Zhu, S. Fu, and Y. Fang. 2020.
Multiyear Measurements on Delta O-17 of Stream Nitrate Indicate High Nitrate Production in a Temperate Forest.
Environmental Science and Technology  54: 4231-4239. --> abstract



94. K. Isobe, Y. Ise, H. Kato, T. Oda, C. E. Vincenot, K. Koba, R. Tateno, K. Senoo, and N. Ohte. 2019.
Consequences of microbial diversity in forest nitrogen cycling: diverse ammonifiers and specialized ammonia oxidizers.
The ISME Journal doi:10.1038/s41396-019-0500-2 --> abstract

93. F. Zhu, L. Dai, E. A. Hobbie, K. Koba, X. Liu, G. A. Gurmesa, S. Huang, S. Li, Y. Li, S. Han, and Y. Fang. 2019.
Uptake Patterns of Glycine, Ammonium, and Nitrate Differ Among Four Common Tree Species of Northeast China.
Frontiers in Plant Science 10:799. doi: 10.3389/fpls.2019.00799. --> abstract

92. K. Shinoda, M. Yano, M. Yoh, M. Yoshida, A. Makabe, Y. Yamagata, B. Z. Houlton, and K. Koba*. 2019.
Control of the Nitrogen Isotope Composition of the Fungal Biomass: Evidence of Microbial Nitrogen Use Efficiency.
Microbes and Environments 34(1): 5-12. --> abstract



91. K. Isobe, J. Ikutani, Y. Fang, M. Yoh, J. Mo, Y. Suwa, M. Yoshida, K. Senoo, S. Otsuka, and K. Koba. 2018.
Highly abundant acidophilic ammonia-oxidizing archaea causes high rates of nitrification and nitrate leaching in nitrogen-saturated forest soils
Soil Biology and Biochemistry 122: 220-228 --> abstract

90. A. Wang, Y. Fang, D. Chen, O. Phillips, K. Koba, W. Zhu, and J. Zhu. 2018.
High nitrogen isotope fractionation of nitrate during denitrification in four forest soils and its implications for denitrification rate estimates.
Science of The Total Environment 633: 1078-1088 --> abstract

89. X.-Y. Liu*, K. Koba*, L. A. Koyama, S. E. Hobbie, M. S. Weiss, Y. Inagaki, G. R. Shaver, A. E. Giblin, S. Hobara, K. J. Nadelhoffer, M. Sommerkorn, E. B. Rastetter, G. W. Kling, J. A. Laundre, Y. Yano, A. Makabe, M. Yano and C.-Q. Liu. 2018.
Nitrate is an important nitrogen source for Arctic tundra plants.
Proceedings of the National Academy of Sciences of the United States of America 115: 3398-3403 --> abstract

88. N. C. Thuan, K. Koba*, M. Yano, A. Makabe, C. T. Kinh, A. Terada, S. Toyoda, N. Yoshida, Y. Tanaka, M. Katsuyama, and M. Yoh. 2018.
N2O production by denitrification in an urban river: evidence from isotopes, functional genes, and dissolved organic matter.
Limnology 19: 115-126 --> abstract



87. X.-Y. Liu, H.-W. Xiao, H.-Y. Xiao, W. Song, X.-C. Sun, X.-D. Zheng, C.-Q. Liu, and K. Koba. 2017.
Stable isotope analyses of precipitation nitrogen sources in Guiyang, southwestern China.
Environmental Pollution 230: 486-494. --> abstract

86. A. Terada, S. Sugawara, K. Hojo, Y. Takeuchi, S. Riya, W. F. HarperJr., T. Yamamoto, M. Kuroiwa, K. Isobe, C. Katsuyama, Y. Suwa, K. Koba and M. Hosomi. 2017.
Hybrid Nitrous Oxide Production from a Partial Nitrifying Bioreactor: Hydroxylamine Interactions with Nitrite.
Environmental Science and Technology 51(5): 2748-2756. --> abstract

85. S. Toyoda, N. Yoshida, and K. Koba. 2017.
Isotopocule analysis of biologically produced nitrous oxide in various environments.
Mass Spectrometry Reviews 36(2): 135-160. --> abstract



84. M. Nishizawa, S. Sakai, U. Konno, N. Nakahara, Y. Takaki, Y. Saito, H. Imachi, E. Tasumi, A. Makabe, K. Koba and K. Takai. 2016.
Nitrogen and oxygen isotope effects of ammonia oxidation by thermophilic Thaumarchaeota from a geothermal water stream.
Applied and Environmental Microbiology 82(15): 4492-4504. --> abstract

83. C. B. Wenk, C. H. Frame, K. Koba, K. L. Casciotti, M. Veronesi, H. Niemann, C. J. Schubert, N. Yoshida, S. Toyoda, A. Makabe, J. Zopfi, and M. F. Lehmann. 2016.
Stable isotope and isotopomer distributions reveal differential N2O dynamics in two oxygen-deficient lake basins.
Limnology and Oceanography 61(5): 1735-1749. --> abstract

82. S. Hobara, K. Kushida, Y. Kim, K. Koba, B.-Y. Lee and N. Ae. 2016.
Relationships among pH, minerals, and carbon in soils from tundra to boreal forest.
Ecosystems 19(6): 1092-1103. --> abstract

81. A. Tanaka-Oda , T. Kenzo, Y. Inoue, M. Yano, K. Koba, and T. Ichie. 2016.
Variation in leaf and soil δ15N in diverse tree species in a lowland dipterocarp rainforest, Malaysia.
Trees 30(2): 509-522. --> abstract



80. J. M. Craine, E. N. J. Brookshire, M. D. Cramer, N. J. Hasselquist, K. Koba, E. Marin-Spiotta, and L. Wang. 2015.
Ecological interpretations of nitrogen isotope ratios of terrestrial plants and soils.
Plant and Soil 396(1): 1-26. --> abstract

79. T. Nunoura, Y. Takaki, M. Hirai, S. Shimamura, A. Makabe, O. Koide, T. Kikuchi, J. Miyazaki, K. Koba, N. Yoshida, M.Sunamura, and K. Takai. 2015.
Hadal biosphere: Insight into the microbial ecosystem in the deepest ocean on Earth.
Proceedings of the National Academy of Sciences of the United States of America 112: E1230-E1236. --> abstract

78. L. A. Rose, S. D. Sebestyen, E. M. Elliott, and K. Koba. 2015.
Drivers of Atmospheric Nitrate Processing and Export in Forested Catchments.
Water Resources Research 51: 1333-1352. --> abstract

77. Y. Fang, K. Koba*, A. Makabe, C. Takahashi, W. Zhu, T. Hayashi, A. A. Hokari, R. Urakawa, E. Bai, B. Z. Houlton, D. Xi, S. Zhang, K. Matsushita, Y. Tu, D. Liu, F. Zhu, Z. Wang, G. Zhou, D. Chen, T. Makita, H. Toda, X. Liu, Q. Chen, D. Zhang, Y. Li, and M. Yoh. 2015.
Microbial denitrification dominates nitrate losses from forest ecosystems.
Proceedings of the National Academy of Sciences of the United States of America 112: 1470-1474. --> abstract

76. J. M. Craine, A. J. Elmore, L. Wang, L. Augusto, W. T. Baisden, E. N. J. Brookshire, M. D. Cramer, N. J. Hasselquist, E. A. Hobbie, A. Kahmen, K. Koba, J. M. Kranabetter, M. C. Mack, E. Marin-Spiotta, J. R. Mayor, K. K. McLauchlan, A. Michelsen, G. B. Nardoto, R. S. Oliveira, S. S. Perakis, P. L. Peri, C. A. Quesada, A. Richter, L. A. Schipper, B. A. Stevenson, B. L. Turner, R. A. G. Viani, W. Wanekm, and B. Zeller. 2015.
Convergence of soil nitrogen isotopes across global climate gradients.
Scientific Reports 5: 8280, doi:10.1038/srep08280. --> abstract

75. W. Wei, K. Isobe, T. Nishizawa, L. Zhu, Y. Shiratori, N. Ohte, K. Koba, S. Otsuka, and K. Senoo. 2015.
Higher diversity and abundance of denitrifying microorganisms in environments than considered previously.
The ISME Journal doi:10.1038/ismej.2015.9. --> abstract

74. K. Umezawa, K. Takeda, T. Ishida, N. Sunagawa, A. Makabe, K. Isobe, K. Koba, H. Ohno, M. Samejima, N. Nakamura, K. Igarashi, and M. Yoshida. 2015.
A novel pyrroloquinoline quinone-dependent 2-keto-D-glucose dehydrogenase from Pseudomonas aureofaciens.
Journal of Bacteriology 197: 1322-1329. --> abstract



73. X.-Y. Liu, K. Koba, A. Makabe, and C.-Q. Liu. 2014.
Nitrate dynamics in natural plants: insights based on the concentration and natural isotope abundances of tissue nitrate.
Frontiers in Plant Science 5:355. doi: 10.3389/fpls.2014.00355 --> abstract

72. M. Nishizawa, J. Miyazaki, A. Makabe, K. Koba, and K. Takai. 2014.
Physiological and isotopic characteristics of nitrogen fixation by hyperthermophilic methanogens: Key insights into nitrogen anabolism of the microbial communities in Archean hydrothermal systems.
Geochimica et Cosmochimica Acta 138: 117-135 --> abstract
--> Press Release

71. T. Yamazaki, T. Hozuki, K. Arai, S. Toyoda, K. Koba, T. Fujiwara, and N. Yoshida. 2014.
Isotopomeric characterization of nitrous oxide produced by reaction of enzymes extracted from nitrifying and denitrifying bacteria.
Biogeosciences 11: 2679-2689 --> abstract

70. A. Wang, Y.-T. Fang, D.-X. Chen, K. Koba, A. Makabe, Y.-D. Li, T.-S. Luo, and M. Yoh. 2014.
Variations in nitrogen-15 natural abundance of plant and soil systems in four remote tropical rainforests, southern China.
Oecologia 174: 567-580 --> abstract

69. M. Yano, S. Toyoda, T. Tokida, K. Hayashi, T. Hasegawa, A. Makabe, K. Koba, and N. Yoshida. 2014.
Isotopomer analysis of production, consumption and soil-to-atmosphere emission processes of N2O at the beginning of paddy field irrigation.
Soil Biology and Biochemistry 70: 66-78. --> abstract

68. N. Tokuchi, S. Yoneda, N. Ohte, N. Usui, K. Koba, M. Kuroiwa, H. Toda, and Y. Suwa. 2014.
Seasonal changes and controlling factors of gross N transformation in an evergreen plantation forest in central Japan.
Journal of Forest Research 19: 77-85. --> abstract



67. A. Terada, S. Sugawara. T. Yamamoto, S. Zhou, K. Koba, and M. Hosomi. 2013.
Physiological characteristics of predominant ammonia-oxidizing bacteria enriched from bioreactors with different influent supply regimes.
Biochemical Engineering Journal 79: 153-161. --> abstract

66. T. Nunoura, M. Nishizawa, T. Kikuchi, T. Tsubouchi, M. Hirai, O. Koide, J. Miyazaki, H. Hirayama, K. Koba, and K. Takai. 2013.
Molecular biological and isotopic biogeochemical prognoses of the nitrification-driven dynamic microbial nitrogen cycle in hadopelagic sediments.
Environmental Microbiology 15: 3087-3107. --> abstract

65. Y. Fang, K. Koba, M. Yoh, A. Makabe, and X. Liu. 2013.
Pattern of foliar δ15N and its controls in Eastern Asian forests.
Ecological Research 28: 735-748. --> abstract

64. X.-Y. Liu, K. Koba*, A. Makabe, X.-D. Li, M. Yoh, and C.-Q. Liu. 2013.
Ammonium first: natural mosses prefer atmospheric ammonium but vary utilization of dissolved organic nitrogen depending on habitat and nitrogen deposition.
New Phytologist 199: 407-419. --> abstract

63. X.-Y. Liu, K. Koba*, Y. Takebayashi, C.-Q. Liu, Y.-T. Fang, and M. Yoh. 2013.
Dual N and O isotopes of nitrate in natural plants: first insights into individual variability and organ-specific patterns.
Biogeochemistry 114: 399-411. --> abstract

62. M. Nishizawa, K. Koba, M. Makabe, N. Yoshida, M. Kaneko, S. Hirao, J. Ishibashi, T. Yamanaka, T. Shibuya, T. Kikuchi, M. Hirai, J. Miyazaki, T. Nunoura, and K. Takai. 2013.
Nitrification-driven forms of nitrogen metabolism in microbial mat communities thriving along an ammonium-enriched subsurface geothermal stream.
Geochimica et Cosmochimica Acta 113: 152-173. --> abstract

61. S. Hobara, K. Koba, N. Ae, A. E. Giblin, K. Kushida, and G. R. Shaver. 2013.
Geochemical influences of substrate histories and phosphorus fertilization on solubility of soil organic carbon in arctic tundra ecosystems.
Soil Science Society of America Journal 77(2): 473-481. --> abstract

60. L. Koyama, M. Hirobe, K. Koba, and N. Tokuchi. 2013.
Nitrate-use traits of understory plants as potential regulators of vegetation distribution on a slope in a Japanese cedar plantation.
Plant and Soil 362: 119-134. --> abstract



59. X. Liu, K. Koba*, C.-Q. Liu, X.-D. Li and M. Yoh. 2012.
Pitfalls and new mechanisms in moss isotope bio-monitoring of atmospheric nitrogen deposition
Environmental Science and Technology 46:12557-12566 --> abstract

58. Y. Fang, K. Koba*, A. Makabe, F. Zhu, S. Fan, X. Liu, and M. Yoh. 2012.
Low δ18O values of nitrate produced from nitrification in temperate forest soils.
Environmental Science and Technology 46:8723-8730. --> abstract

57. X. Liu, K. Koba*, M. Yoh, and C.-Q. Liu. 2012.
Nitrogen and oxygen isotope effects of tissue nitrate associated wit nitrate aquisition and utilization in the moss Hypnum plumaeforme.
Functional Plant Biology 39:598-608. --> abstract

56. M. Nakagawa, Y. Ueno, S. Hattori, M. Umemura, A. Yagi, K. Takai, K. Koba, Y. Sasaki, A. Makabe, and N. Yoshida. 2012.
Seasonal change in microbial sulfur cycling in monomictic Lake Fukami-ike.
Limnology and Oceanography 57:974-988. DOI: 10.4319/lo.2012.57.4.0974. --> abstract

55. K. Isobe, K. Koba, Y. Suwa., J. Ikutani, M. Kuroiwa, Y. Fang, M. Yoh, J. Mo, S. Otsuka, and K. Senoo. 2012.
Nitrite transformations in an N-saturated forest soil.
Soil Biology and Biochemistry 52:61–63. --> abstract

54. Y. Mochizuki, K.Koba*, and M. Yoh. 2012.
Strong inhibitory effect of nitrate on atmospheric methane oxidation in forest soils.
Soil Biology and Biochemistry 50:164-166. --> abstract

53. K. Koba, Y. Fang, J. Mo, W. Zhang, X. Lu, L. Liu, T. Zhang, Y. Takebayashi, S. Toyoda, N. Yoshida, K. Suzuki, M. Yoh, and K. Senoo. 2012.
15N natural abundance of the N lost from an N-saturated subtropical forest in southern China.
Journal of Geophysical Research-Biogeosciences, VOL. 117, G02015, 13 PP., 2012 doi:10.1029/2010JG001615 --> abstract

52. S. Hattori, H. Nashimoto, H Kimura, K. Koba, K. Yamada, M. Shimizu, H. Watanabe, M. Yoh, and N. Yoshida. 2012.
Hydrogen and carbon isotope fractionation by thermophilic hydrogenotrophic methanogens from a deep aquifer under coculture with fermenters.
Geochemical Journal 46:193-200. --> abstract

51. K. Isobe, K. Koba, Y. Suwa, J. Ikutani, Y. Fang, M. Yoh, J. Mo, S. Otsuka, and K. Senoo. 2012.
High abundance of ammonia-oxidizing archaea in acidified subtropical forest soils in southern China after long-term N deposition.
FEMS Microbiology Ecology 80:193-203. --> abstract

50. X. Liu, K. Koba*, Y. Takebayashi, C. Liu, Y. Fang, M. Yoh, X. Y. Liu, C. Q. Liu, and Y. T. Fang. 2012.
Preliminary insights into delta 15N and delta 18O of nitrate in natural mosses: a new application of the denitrifier method.
Environmental Pollution 162:48-55. --> abstract



49. K. Isobe, K. Koba, S. Otsuka, and K. Senoo. 2011.
Nitrification and nitrifying microbial communities in forest soils.
Journal of Forest Research 16:351-362. --> abstract

48. Y. Fang, P. Gundersen, R. D. Vogt, K. Koba, F. Chen, X. Y. Chen, and M. Yoh. 2011.
Atmospheric deposition and leaching of nitrogen in Chinese forest ecosystems.
Journal of Forest Research 16:341-350. --> abstract

47. Y. Fang, M. Yoh, K. Koba, W. Zhu, Y. Takebayashi, Y. Xiao, C. Lei, J. Mo, W. Zhang, and X. Lu. 2011.
Nitrogen deposition and forest nitrogen cycling along an urban-rural transect in southern China.
Global Change Biology 17:872-885. --> abstract

46. Y. T. Fang, K. Koba, X. M. Wang, D. Z. Wen, J. Li, Y. Takebayashi, X. Y. Liu, and M. Yoh. 2011.
Anthropogenic imprints on nitrogen and oxygen isotopic composition of precipitation nitrate in a nitrogen-polluted city in southern China.
Atmospheric Chemistry and Physics 11:1313-1325. --> abstract

45. K. Isobe, K. Koba, S. Ueda, K. Senoo, S. Harayama, and Y. Suwa. 2011.
A simple and rapid GC/MS method for the simultaneous determination of gaseous metabolites.
Journal of Microbiological Methods 84:46-51. --> abstract

44. K. Isobe, Y. Suwa, J. Ikutani, M. Kuroiwa, T. Makita, Y. Takebayashi, M. Yoh, S. Otsuka, K. Senoo, M. Ohmori, and K. Koba*. 2011.
Analytical Techniques for Quantifying 15N/14N of Nitrate, Nitrite, Total Dissolved Nitrogen and Ammonium in Environmental Samples Using a Gas Chromatograph Equipped with a Quadrupole Mass Spectrometer.
Microbes and Environments 26:46-53. --> abstract

43. M. Kuroiwa, K. Koba*, K. Isobe, R. Tateno, A. Nakanishi, Y. Inagaki, H. Toda, S. Otsuka, K. Senoo, Y. Suwa, M. Yoh, R. Urakawa, and H. Shibata. 2011.
Gross nitrification rates in four Japanese forest soils: heterotrophic versus autotrophic and the regulation factors for the nitrification.
Journal of Forest Research 16:363-373. --> abstract

42. Y. Sasaki, K. Koba*, M. Yamamoto, A. Makabe, Y. Ueno, M. Nakagawa, S. Toyoda, N. Yoshida, and M. Yoh. 2011.
Biogeochemistry of nitrous oxide in Lake Kizaki, Japan, elucidated by nitrous oxide isotopomer analysis.
Journal of Geophysical Research-Biogeosciences 116: G04030, doi:10.1029/2010JG001589. --> abstract

[ H. Shibata, H. Toda, Y. Inagaki, R. Tateno, K. Koba, and T. Tange. 2011.
Soil nitrogen dynamics of forest ecosystems under environmental changes.
Journal of Forest Research 16:331-332. --> abstract]

41. H. Shibata, R. Urakawa, H. Toda, Y. Inagaki, R. Tateno, K. Koba, A. Nakanishi, K. Fukuzawa, and A. Yamasaki. 2011.
Changes in nitrogen transformation in forest soil representing the climate gradient of the Japanese archipelago.
Journal of Forest Research 16:374-385. --> abstract

40. Y. Tabayashi, and K. Koba. 2011.
Heterogeneous Atmospheric Nitrogen Deposition Effects Upon the Nitrate Concentration of Stream Waters in a Forested Mountain Area.
Water Air and Soil Pollution 216:105-115. --> abstract

39. S. Toyoda, M. Yano, S.-i. Nishimura, H. Akiyama, A. Hayakawa, K. Koba, S. Sudo, K. Yagi, A. Makabe, Y. Tobari, N. O. Ogawa, N. Ohkouchi, K. Yamada, and N. Yoshida. 2011.
Characterization and production and consumption processes of N2O emitted from temperate agricultural soils determined via isotopomer ratio analysis.
Global Biogeochemical Cycles 25: GB2008, doi:10.1029/2009GB003769. --> abstract



38. H. Kimura, K. Mori, H. Nashimoto, S. Hattori, K. Yamada, K. Koba, N. Yoshida, and K. Kato. 2010.
Biomass production and energy source of thermophiles in a Japanese alkaline geothermal pool.
Environmental Microbiology 12:480-489. --> abstract

37. H. Kimura, H. Nashimoto, M. Shimizu, S. Hattori, K. Yamada, K. Koba, N. Yoshida, and K. Kato. 2010.
Microbial methane production in deep aquifer associated with the accretionary prism in Southwest Japan.
The ISME Journal 4:531-541. --> abstract

36. K. Koba, K. Isobe, Y. Takebayashi, Y. T. Fang, Y. Sasaki, W. Saito, M. Yoh, J. Mo, L. Liu, X. Lu, T. Zhang, W. Zhang, and K. Senoo. 2010.
Delta15N of soil N and plants in a N-saturated, subtropical forest of southern China.
Rapid Communications in Mass Spectrometry 24:2499-2506. --> abstract

35. N. Ohte, I. Tayasu, A. Kohzu, C. Yoshimizu, K. Osaka, A. Makabe, K. Koba, N. Yoshida, and T. Nagata. 2010.
Spatial distribution of nitrate sources of rivers in the Lake Biwa watershed, Japan: Controlling factors revealed by nitrogen and oxygen isotope values.
Water Resources Research 46: W07505, doi:10.1029/2009WR007871. --> abstract

34. K. Osaka, N. Ohte, K. Koba, C. Yoshimizu, M. Katsuyama, M. Tani, I. Tayasu, and T. Nagata. 2010.
Hydrological influences on spatiotemporal variations of delta15N and delta18O of nitrate in a forested headwater catchment in central Japan: Denitrification plays a critical role in groundwater.
Journal of Geophysical Research-Biogeosciences 115: G02021, doi:10.1029.2009JG000977. --> abstract

33. Y. Takebayashi, K. Koba*, Y. Sasaki, Y. Fang, and M. Yoh. 2010.
The natural abundance of 15N in plant and soil-available N indicates a shift of main plant N resources to NO3- from NH4+ along the N leaching gradient.
Rapid Communications in Mass Spectrometry 24:1001-1008. --> abstract

32. Y. Tobari, K. Koba*, K. Fukushima, N. Tokuchi, N. Ohte, R. Tateno, S. Toyoda, T. Yoshioka, and N. Yoshida. 2010.
Contribution of atmospheric nitrate to stream-water nitrate in Japanese coniferous forests revealed by the oxygen isotope ratio of nitrate.
Rapid Communications in Mass Spectrometry 24:1281-1286. --> abstract



31. M. Itoh, N. Ohte, and K. Koba. 2009.
Methane flux characteristics in forest soils under an East Asian monsoon climate.
Soil Biology & Biochemistry 41:388-395. --> abstract

30. K. Koba, K. Osaka, Y. Tobari, S. Toyoda, N. Ohte, M. Katsuyama, N. Suzuki, M. Itoh, H. Yamagishi, M. Kawasaki, S. J. Kim, N. Yoshida, and T. Nakajima. 2009.
Biogeochemistry of nitrous oxide in groundwater in a forested ecosystem elucidated by nitrous oxide isotopomer measurements.
Geochimica et Cosmochimica Acta 73:3115-3133. --> abstract

29. S. Toyoda, H. Iwai, K. Koba, and N. Yoshida. 2009.
Isotopomeric analysis of N2O dissolved in a river in the Tokyo metropolitan area.
Rapid Communications in Mass Spectrometry 23:809-821. --> abstract



28. M. Itoh, N. Ohte, K. Koba, A. Sugimoto, and M. Tani. 2008.
Analysis of methane production pathways in a riparian wetland of a temperate forest catchment, using delta13C of pore water CH4 and CO2.
Journal of Geophysical Research-Biogeosciences 113: G030005, doi:10.1029/2007JG000647. --> abstract



27. Arai, H., N. Tokuchi, and K. Koba. 2007.
Possible mechanisms leading to a delay in carbon stock recovery after land use change.
Soil Science Society of America Journal 71:1636-1638. --> abstract

26. M. Itoh, N. Ohte, K. Koba, M. Katsuyama, K. Hayamizu, and M. Tani. 2007.
Hydrologic effects on methane dynamics in riparian wetlands in a temperate forest catchment.
Journal of Geophysical Research-Biogeosciences 112: G01019, doi:10.1029/2006JG000240. --> abstract

25. X. Li, H. Masuda, K. Koba, and H. Zeng. 2007.
Nitrogen isotope study on nitrate-contaminated groundwater in the Sichuan Basin, China.
Water Air and Soil Pollution 178:145-156. --> abstract

24. H. Yamagishi, M. B. Westley, B. N. Popp, S. Toyoda, N. Yoshida, S. Watanabe, K. Koba, and Y. Yamanaka. 2007.
Role of nitrification and denitrification on the nitrous oxide cycle in the eastern tropical North Pacific and Gulf of California.
Journal of Geophysical Research-Biogeosciences 112: G02015, doi:10.1029/2006JG000227. --> abstract



23. S. Hobara, C. McCalley, K. Koba, A. E. Giblin, M. S. Weiss, G. M. Gettel, and G. R. Shaver. 2006.
Nitrogen fixation in surface soils and vegetation in an arctic tundra watershed: A key source of atmospheric nitrogen.
Arctic Antarctic and Alpine Research 38:363-372. --> abstract

22. K. Kameda, K. Koba, S. Hobara, T. Osono, and M. Terai. 2006.
Pattern of natural N-15 abundance in lakeside forest ecosystem affected by cormorant-derived nitrogen.
Hydrobiologia 567:69-86. --> abstract

21. K. Osaka, N. Ohte, K. Koba, M. Katsuyama, and T. Nakajima. 2006.
Hydrologic controls on nitrous oxide production and consumption in a forested headwater catchment in central Japan.
Journal of Geophysical Research-Biogeosciences 111: G01013, doi:10.1029/2005JG00026. --> abstract

20. T. Osono, S. Hobara, K. Koba, and K. Kameda. 2006.
Reduction of fungal growth and lignin decomposition in needle litter by avian excreta.
Soil Biology & Biochemistry 38:1623-1630. --> abstract

19. T. Osono, S. Hobara, K. Koba, K. Kameda, and H. Takeda. 2006.
Immobilization of avian excreta-derived nutrients and reduced lignin decomposition in needle and twig litter in a temperate coniferous forest.
Soil Biology & Biochemistry 38:517-525. --> abstract



18. M. Abe, T. Yoshimura, S. Koizumi, N. Hasegawa, T. Osaki, N. Yasukawa, K. Koba, K. Moriya, and T. Sakai. 2005.
Virtual forest: design and evaluation of a walk-through system for forest education.
Journal of Forest Research 10:189-197. --> abstract

17. M. Abe, T. Yoshimura, N. Yasukawa, K. Koba, K. Moriya, and T. Sakai. 2005.
Development and evaluation of a support system for forest education.
Journal of Forest Research 10:43-50. --> abstract

16. S. Hobara, K. Koba, T. Osono, N. Tokuchi, A. Ishida, and K. Kameda. 2005.
Nitrogen and phosphorus enrichment and balance in forests colonized by cormorants: Implications of the influence of soil adsorption.
Plant and Soil 268:89-101. --> abstract



15. Y. Nakajima, H. Shimizu, N. Ogawa, T. Sakamoto, H. Okada, K. Koba, H. Kitazato, and N. Ohkouchi. 2004.
Vertical distributions of stable isotopic compositions and bacteriochlorophyll homologues in suspended particulate matter in saline meromictic Lake Abashiri.
Limnology 5:185-189. --> abstract



14. S. Hasegawa, K. Koba, I. Tayasu, H. Takeda, and H. Haga. 2003.
Carbon autonomy of reproductive shoots of Siberian alder (Alnus hirsuta var. sibirica).
Journal of Plant Research 116:183-188. --> abstract

13. M. Hirobe, K. Koba, and N. Tokuchi. 2003.
Dynamics of the internal soil nitrogen cycles under moder and mull forest floor types on a slope in a Cryptomeria japonica D. Don plantation.
Ecological Research 18:53-64. --> abstract

12. K. Koba, M. Hirobe, L. Koyama, A. Kohzu, N. Tokuchi, K. Nadelhoffer, E. Wada, and H. Takeda. 2003.
Natural N-15 abundance of plants and soil N in a temperate coniferous forest.
Ecosystems 6:457-469. --> abstract

11. Ohte, N., K. Koba, K. Yoshikawa, A. Sugimoto, N. Matsuo, N. Kabeya, and L. Wang. 2003.
Water utilization of natural and planted trees in the semiarid desert of Inner Mongolia, China.
Ecological Applications 13:337-351. --> abstract

10. N. Ohte, N. Tokuchi, M. Katsuyama, S. Hobara, Y. Asano, and K. Koba. 2003.
Episodic increases in nitrate concentrations in streamwater due to the partial dieback of a pine forest in Japan: runoff generation processes control seasonality.
Hydrological Processes 17:237-249. --> abstract

9. R. Tateno, S. Katagiri, H. Kawaguchi, Y. Nagayama, C. Li, A. Sugimoto, and K. Koba. 2003.
Use of foliar N-15 and C-13 abundance to evaluate effects of microbiotic crust on nitrogen and water utilization in Pinus massoniana in deteriorated pine stands of south China.
Ecological Research 18:279-286. --> abstract



8. T. Osono, S. Hobara, S. Fujiwara, K. Koba, and K. Kameda. 2002.
Abundance, diversity, and species composition of fungal communities in a temperate forest affected by excreta of the Great Cormorant Phalacrocorax carbo.
Soil Biology & Biochemistry 34:1537-1547. --> abstract



7. S. Hobara, T. Osono, K. Koba, N. Tokuchi, S. Fujiwara, and K. Kameda. 2001.
Forest floor quality and N transformations in a temperate forest affected by avian-derived N deposition.
Water Air and Soil Pollution 130:679-684. --> abstract

6. S. Hobara, N. Tokuchi, N. Ohte, K. Koba, M. Katsuyama, S. Kim, and A. Nakanishi. 2001.
Mechanism of nitrate loss from a forested catchment following a small-scale, natural disturbance.
Canadian Journal of Forest Research-Revue Canadienne De Recherche Forestiere 31:1326-1335. --> abstract



5. N. Tokuchi, M. Hirobe, and K. Koba. 2000.
Topographical differences in soil N transformation using 15N dilution method along a slope in a conifer plantation forest in Japan.
Jounral of Forest Research 5: 13-19. --> abstract

4. A. Kohzu, T. Tateishi, A. Yamada, K. Koba, and E. Wada. 2000.
Nitrogen isotope fractionation during nitrogen transport from ectomycorrhizal fungi, Suillus granulatus, to the host plant, Pinus densiflora.
Soil Science and Plant Nutrition 46:733-739. --> abstract



3. A. Kohzu, T. Yoshioka, T. Ando, M. Takahashi, K. Koba, and E. Wada. 1999.
Natural C-13 and N-15 abundance of field-collected fungi and their ecological implications.
New Phytologist 144:323-330. --> abstract



2. K. Koba, N. Tokuchi, T. Yoshioka, E. Hobbie, and G. Iwatsubo. 1998.
Natural abundance of nitrogen-15 in a forest soil.
Soil Science Society of America Journal 62:778-781.--> abstract



1. K. Koba, N. Tokuchi, E. Wada, T. Nakajima, and G. Iwatsubo. 1997.
Intermittent denitrification: The application of a N-15 natural abundance method to a forested ecosystem.
Geochimica et Cosmochimica Acta 61:5043-5050. --> abstract


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Peer-reviewerd articles in Japanese (20180129 Updated)

13. 柳井洋介・木庭啓介
モニタリングとモデリングに基づく物質動態広域評価の最前線 ?広域における炭素・窒素・水の動態を探る? 2. どのような観測が広域評価に貢献できるのか
日本土壌肥料学会誌 88(2):147-152 (2017) --> link

12. 木庭啓介
Radioisotopes 66:343-354 (2017) --> link

11. 木庭啓介
広域評価を目指した室内実験および圃場観測:硝化を例とした 実験室とモニタリングのつながりについての小考察
土壌の物理性 122:35-39 (2012) --> link

10. 木庭啓介
極限環境微生物学会誌 Vol. 6 (2007) No. 1 P 52-58. --> link

9. 木庭 啓介、眞壁 明子
水文・水資源学会誌19: 293-301 (2006)

8. 伊藤雅之、大手信人、勝山正則、木庭啓介、川ア雅俊、谷誠
水文・水資源学会誌 18:244-256 (2005)

7. 阿部光敏、長谷川直人、木庭啓介、守屋和幸、酒井徹朗
GPS・PDA による自然観察のための資料提示システム
日本教育工学会論文誌 Vol.28 No.1 pp.39-47 (2004)

6. 斉藤友則、木庭啓介、酒井徹朗、亀田佳代子、吉岡崇仁
コンジョイント分析を用いた野生動物問題に対する仮想的対策事前評価 −滋賀県琵琶湖におけるカワウ問題を事例として−
日本評価研究 第2 巻第2 号 79-90 (2002)

5. 松尾奈緒子、大手信人、小杉緑子、木庭啓介
水文・水資源学会誌 15:229-242 (2002)

4. 松尾奈緒子、大手信人、木庭啓介、小杉緑子、壁谷直記、張 国盛、王 林和、吉川 賢
中国内蒙古毛烏素沙地に生息する植物の水利用効率の考察 - 炭素安定同位体比を用いた解析 -
日本緑化工学学会誌 27:68-73 (2001)

3. 木庭啓介、高橋和志、高津文人
日本生態学会誌 49:47-51 (1999)

2. 小川奈々子、木庭啓介、高津文人、和田英太郎
Radioisotopes 46:632-644 (1997)

1. 木庭啓介
Radioisotopes 44:81-82 (1995)

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Non-reviewed articles in Japanese

1. 木庭啓介,徳地直子,岩坪五郎,和田英太郎. 自然安定同位体比を用いた森林生態系における脱窒過程の検討. 京都大学演習林報告. 京都大学演習林. 66巻. 37-47. 1994.

2. 木庭啓介,徳地直子. 森林生態系における無機態窒素の動態. 遺伝. 裳華房. 51巻. 42-46. 1997.

3. 亀田佳代子,保原 達,大園享司,木庭啓介. カワウによる水域から陸域への物質輸送とその影響. 月刊海洋. 海洋出版. 34巻. 442-448. 2002. 

4. 宗興,吉岡崇仁,朴 昊澤,吉田恭司,勝山正則,龍田優美,柴田英昭, 大手信人,杉山浩史,木平英一,川崎雅俊,由水千景,戸田任重,八木一行,服部重昭,田中隆文,佐野方昴,坂井田稔,丹羽智子,田中庸央,壁谷直記,小倉紀雄,蔵治光一郎,戸田浩人,笹賀一郎,徳地直子,保原 達,木庭啓介,武重祐史,M.G.M. Khan,田上英一郎,岡崎亮太,占部城太郎,上村由加里,沖野外輝夫,宝川靖和,徐 明崗,秦 道珠,鄒 長明,朱 建国,蔡 祖聰. 集水域の生物地球化学:その意義と展望. 陸水学雑誌. 日本陸水学会. 64巻. 49-79. 2003.

5. 柴田 英昭,戸田 浩人,稲垣 善之,舘野 隆之輔,木庭 啓介,福澤 加里部. 森林源流域における窒素の生物地球化学過程と渓流水質の形成. 地球環境. 国際環境研究協会. 15巻. 133-143. 2010.

6. 木庭啓介, 楊 宗興. 土壌圏における窒素循環と微生物 N2Oの動態を中心として 6. 同位体解析から見た窒素循環と微生物. 化学と生物. 日本農芸化学会. 49巻. 711-717. 2011.

7. 木庭啓介. 有機野菜は判定できるか 硝酸イオン同位体比の利用可能性について. 現代化学. 552. 38-40. 2017.

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  1. E. Wada, I. Tayasu, K. Koba, T. Matsubara, N. O. Ogawa, Y. Yamada, K. Yoshii and A. Sugimoto.
    The use of stable isotopes for ecological studies. In:Gopal, B., Pathak, P.S. and Saxena, K. G. (Eds.) Ecology today: An anthology of contemporary ecological research. International Scientific Publishers pp 407-430 . 1998. ※

  2. 木庭啓介. 炭素循環. 「炭素の辞典」(玉浦 裕 編). 朝倉書店. 589-599. 2007. ※

  3. 木庭啓介. 土壌と河川における微生物学的窒素除去プロセスの評価. 「流域環境評価と安定同位体−水循環から生態系まで」(永田 俊、宮島 利宏 編). 京都大学学術出版会. 199-216. 2008. ※
  4. 木庭啓介, 高津文人. 流域環境におけるメタン酸化とメタン食物連鎖の評価. 「流域環境評価と安定同位体−水循環から生態系まで」(永田 俊、宮島 利宏 編). 京都大学学術出版会. 240-241. 2008. ※
  5. 木庭啓介. アイソトポマー・分子内同位体分布. 「流域環境評価と安定同位体−水循環から生態系まで」(永田 俊、宮島 利宏 編). 京都大学学術出版会. 388-394. 2008. ※

  6. 木庭啓介. 溶存有機炭素. 「地球化学実験法」(田中 剛、吉田 尚弘 編). 培風館. 25-29. 2010. ※

  7. N. Ohkouchi, I. Tayasu and K. Koba. Earth, Life and Isotopes. Kyoto University Press. pp430. ISBN 978-87698-960-7. 2010. ※
  8. K. Koba, K. Inagaki, Y. Sasaki, Y. Takebayashi, M. Yoh. Nitrogen isotopic analysis of dissolved inorganic and organic nitrogen in soil extracts. In: N. Ohkouchi, I. Tayasu and K. Koba. (Eds.) Earth, Life and Isotopes. Kyoto University Press. 17-36. 2010. ※

    "Wada school" From right to left: Dr. Nao Ohkouchi, Dr. Eitaro Wada, Dr. Ichiro Tayasu and myself (20100809 at Yokohama)