Shimpei Oikawa Contact College of Science Ibaraki University Bldg. A303 Mito 310-0056 Japan Email Last update: July 4, 2014. Copyright Shimpei Oikawa © 2010

Researth interests Plant ecology: leaf phenology, nitrogen use and carbon balance with emphasis on global change issues Publications Noriyuki Osada, Shimpei Oikawa, Kaoru Kitajima (2014) Implications of lifespan variation within a leaf cohort for evaluation of the optimal timing of leaf shedding. Functional Ecology, accepted Chiho Kamiyama, Shimpei Oikawa, Kouki Hikosaka (2014) Seasonal change in light partitioning among coexisting species of different functional groups along elevation gradient in subalpine moorlands. New Phytologist, accepted Kouki Hikosaka, Takehiro Sasaki, Chiho Kamiyama, Masatoshi Katabuchi, Shimpei Oikawa, Masaya Shimazaki, Hiroshi Kimura and Tohru Nakashizuka (2014) Understanding of species niche, coexistence and extinction based on functional traits: approaches from community and physiological ecology for subalpine moorland plant communities. Chikyukankyo 19: 33-46 (In Japanese) Shimpei Oikawa, Masumi Okada, Kouki Hikosaka (2013) Effects of elevated CO2 on leaf area dynamics in nodulating and non-nodulating soybean stands. Plant and Soil 373: 627-639 Noriyuki Osada, Shimpei Oikawa, Onno Muller, Rie Miyata (2013) Future perspectives of the study of leaf lifespan. Japanese Journal of Ecology 63: 81-83 (In Japanese) Shimpei Oikawa, Noriyuki Osada (2013) Leaf shedding and whole-plant carbon gain. Japanese Journal of Ecology 63: 59-67 (In Japanese) Noriyuki Osada, Shimpei Oikawa, Rie Miyata, Chiho Kamiyama, Soichiro Nagano, Satomi Shiodera, Azusa Tabata, Kiyomi Ono (2013) Patterns of within-species variation in leaf lifespan in relation to environmental factors: General trends and differences across species of different functional types. Japanese Journal of Ecology 63: 19-36 (In Japanese) Shimpei Oikawa, Noriyuki Osada, Yoshiyuki Miyazawa, Rie Miyata, Onno Muller (2013) A brief history of leaf lifespan research. Japanese Journal of Ecology 63: 11-17 (In Japanese) Zhu Chunwu, Weigo Chen, Hidemitsu Sakai, Shimpei Oikawa, Rebecca C Laza, Yasuhiro Usui, Toshihiro Hasegawa (2013) Effects of elevated [CO2] on stem and root lodging among rice cultivars. Chinese Science Bulletin 58: 1787-1794 Tadaki Hirose, Shimpei Oikawa (2012) Mean residence time: leaf number, area, dry mass, and nitrogen in canopy photosynthesis. Oecologia 169: 927-937 Toshihiko Kinugasa, Takashi Sato, Shimpei Oikawa, Tadaki Hirose (2011) Demand and supply of N in seed production of soybean (Glycine max) at different N fertilization levels after flowering. Journal of Plant Research 125: 275-281 Kouki Hikosaka, Shimpei Oikawa, Toshihiko Kinugasa, Yusuke Onoda, Tadaki Hirose (2011) Effects of elevated CO2 concentration on seed production in C3 annual plants. Journal of Experimental Botany 62: 1523-1530 Chiho Kamiyama, Shimpei Oikawa, Takuya Kubo, Kouki Hikosaka (2010) Light interception in species with different functional groups coexisting in moorland plant communities. Oecologia 164: 591-599 Shimpei Oikawa, Kay-May Miyagi, Kouki Hikosaka, Masumi Okada, Toshinori Matsunami, Makie Kokubun, Toshihiko Kinugasa, Tadaki Hirose (2010) Interactions between elevated CO2 and N2-fixation determine soybean yield - a test using a non-nodulated mutant. Plant and Soil 330: 163-172 Shimpei Oikawa (2008) Structure of herbaceous plant stands and canopy photosynthesis models. In: Low Temperature Science Vol. 67 (Eds. Institute of Low Temperature Science, Hokkaido University and The Japanese Association for Photosynthesis Research), pp.103-112 (In Japanese) (Erratum) Yosuke Matsumoto, Shimpei Oikawa, Yuko Yasumura, Tadaki Hirose, Kouki Hikosaka (2008) Reproductive yield of individuals competing in a dense stand of an annual, Xanthium canadense. Oecologia 157: 185-195 Shimpei Oikawa, Kouki Hikosaka, Tadaki Hirose (2008) Does leaf shedding increase the whole-plant carbon gain despite some nitrogen being lost with shedding? New Phytologist 178: 617-624 Shimpei Oikawa, Kouki Hikosaka, Tadaki Hirose (2006) Leaf lifespan and lifetime carbon gain of individual leaves in a stand of an annual herb, Xanthium canadense. New Phytologist 172: 104-116 (This article appeared in Virtual Special Issue on 'Plant ecological strategy axes in leaf and wood traits' of New Phytologist in June 2008 again.) Shimpei Oikawa, Kouki Hikosaka, Tadaki Hirose (2005) Dynamics of leaf area and nitrogen in a canopy of an annual herb, Xanthium canadense. Oecologia 143: 517-526 Shimpei Oikawa, Kouki Hikosaka, Tadaki Hirose, Masae Shiyomi, Shigeo Takahashi, Yoshimichi Hori (2004) Cost-benefit relationships in fronds emerging at different times in a deciduous fern, Pteridium aquilinum. Canadian Journal of Botany 82: 521-527 Experience Assistant professor, College of Science, Ibaraki University (2013-present) Post-doctoral research fellow, Tokyo University of Agriculture (2010-2012) Influence of CO2 and nitrogen fertilization on leaf turnover, growth and seed production of rice under Free-air CO2 enrichment. Visiting scholar, Department of Plant Biology, University of Illinois (2009) Nitrogen dynamics and dry matter production in a ozone-sensitive- and a less-sensitive soybean along O3 gradients. Post-doctoral research fellow, Center for Bioresource Field Science, Kyoto Institute of Technology/Japan Society for the Promotion of Science (2007-2008) Optimal timing of leaf shedding for carbon gain of leaf and plant. Post-doctoral research fellow, Graduate School of Life Sciences, Tohoku University (2005-2006) Interspecific competition for resources and aboveground productivity in wetland plant communities along an altitudinal gradient.