Hiroyuki Muraoka, Ph.D.

Institute for Basin Ecosystem Studies, Gifu University
1-1 Yanagido, Gifu, 501-1193 Japan
e-mail: muraoka at green.gifu-u.ac.jp



Degrees
B.S. - University of Tsukuba - Biological Sciences (Plant ecology) - 1994
M.S. - University of Tsukuba - Environmental Sciences (Plant ecology) - 1996
Ph.D. - University of Tsukuba - Biological Sciences (Plant ecology) - 1999
Academic positions
1998 - 2000
Post-doc Research Fellow of JSPS, University of Tsukuba
2000 - 2003
Post-doc Research Fellow of JSPS, Gifu University
2003 -
Post-doc research fellow, Institute for Basin Ecosystem Studies, Gifu University
2005 -
Associate Professor, Institute for Basin Ecosystem Studies, Gifu University
Oct, 2008 -
Professor, Institute for Basin Ecosystem Studies, Gifu University
-- Ecosystem Physiology Group --

Research interests

1 Acquisition and use of light and water by the plants for their growth and survival in natural habitats.

(1) Adaptive significance of morphological and physiological plasticity in deciduous forest understory herb, Arisaema heterophyllum (Araceae).
(2) Role of leaf display and leaf gas exchange characteristics in Aster kantoens in gravelly floodplain habitat.
(3) Plasticity in leaf display and leaf physiology in deciduous tree seedlings
2 Ecophysiological role of plants in ecosystem carbon cycling

(1) Ecophysiological role of canopy and understory species in forest carbon cycling. (2) Carbon cycling and balance in a high arctic polar semi-desert
Publications

  1. Muraoka H., Tang Y., Koizumi H. and Washitani I.(1997) Combined effects of light and water availability on photosynthesis and growth of Arisaema heterophyllum in the forest understory and an open site. Oecologia 112:26-34 Abstract

  2. Muraoka H., Takenaka A., Tang Y., Koizumi H. and Washitani I. (1998) Flexible leaf orientations of Arisaema heterophyllum maximize light capture in a forest understorey and avoid excess irradiance at a deforested site. Annals of Botany 82:297-307 Abstract

  3. Muraoka H., Tang Y., Terashima I., Koizumi H. and Washitani I. (2000) Contributions of diffusional limitation, photoinhibition and photorespiration to the midday depression of photosynthesis in Arisaema heterophyllum in the natural high light. Plant, Cell and Environment 23: 235-250 Abstract

  4. Matsumoto J., Muraoka H. and Washitani I. (2000) Ecophysiological mechanisms of an endangered species Aster kantoensis to withstand high light and heat stresses of the gravelly floodplain. Annals of Botany 86: 777-785 Abstract

  5. Matsumoto J., Muraoka H. and Washitani I. (2000) Whole plant carbon gain of an endangered herbaceous species Aster kantoensis and shading influences by an alien grass Eragrostis culvula in the gravelly floodplain habitat. Annals of Botany 86:787-797 Abstract

  6. Kobayashi T., Muraoka H. and Shimano K. (2000) Photosynthesis and biomass allocation of beech (Fagus crenata) and dwarf-bamboo (Sasa kurilensis) in response to contrasting light regimes in a Japan Sea-type beech forest. Journal of Forest Research 5:103-107

  7. Muraoka H., Hirota H., Matsumoto J., Nishimura S., Tang Y., Koizumi H. and Washitani I. (2001) On the convertibility of different light availability indices, relative illuminance and relative photon flux density. Functional Ecology 15: 798-803 Abstract

  8. Uchida M., Muraoka H., Nakatsubo T., Bekku Y., Ueno T., Kanda H. and Koizumi H. (2002) Net photosynthesis, respiration and production of the moss Sanionia uncinata on a glacier foreland in the High Arctic, Ny-Alesund, Svalbard. Arctic, Antarctic, and Alpine Research 34:287-292

  9. Muraoka H., Tang Y., Koizumi H. and Washitani I. (2002) Effects of light and soil water availability on leaf photosynthesis and growth of Arisaema heterophyllum, a riparian forest understory plant. Journal of Plant Research 115:419-427

  10. Muraoka H., Uchida M., Mishio M., Nakatsubo T., Kanda H. and Koizumi H. (2002) Leaf photosynthetic characteristics and net primay production of the polar willow (Salix polaris) in a high arctic polar semi-desert, Ny-Alesund, Svalbard. Canadian Journal of Botany 80:1193-1202

  11. Muraoka H., Koizumi H. and R.W. Pearcy (2003) Leaf display and photosynthesis of tree seedlings in a cool-temperate deciduous broadleaf forest understory. Oecologia 135: 500-509

  12. Noda H., Muraoka H. and Washitani I. (2004) Morphological and physiological acclimation responses to contrasting light and water regimes in Primula sieboldii, an endangered clonal herb in Japan. Ecological Research 19:331-340

  13. Kobayashi T., Shimano K. and Muraoka H. (2004) Effect of light availability on the carbon gain of beech (Fagus crenata) seedlings with reference to the density of dwarf bamboo (Sasa kurilensis) in an understory of Japan Sea-type beech forest. Plant Species Biology 19:33-46

  14. Pearcy R.W., Muraoka H. and Valladares F. (2004) Crown architecture in sun and shade environments: assessing function and tradeoffs with a 3-D simulation model. New Phytologist (accepted)

  15. Nakatsubo T., Bekku Y.S., Uchida M., Muraoka H., Kume A., Ohtsuka T., Masuzawa T., Kanda H. and Koizumi H. (2005) Ecosystem development and carbon cycle on a glacier foreland in the high Arctic, Ny-Alesund, Svalbard. Journal of Plant Research 118:173-179.

  16. Muraoka H. and Koizumi H. (2005) Photosynthetic and structural characteristics of canopy and shrub trees in a cool-temperate deciduous broadleaved forest: implication to the ecosystem carbon gain. Agricultural and Forest Meteorology 134: 39-59

  17. Kondo M., Muraoka H., Uchida M., Yazaki Y. and Koizumi H. (2005) Refixation of respired CO2 by understory vegetation in a cool-temperate deciduous forest in Japan. Agricultural and Forest Meteorology 134: 110-121.

  18. Ito A., Muraoka H., Koizumi H., Saigusa N., Murayama S. and Yamamoto S. (2006) Seasonal variation in leaf properties and ecosystem carbon budget in a cool-temperate deciduous broad-leaved forest: simulation analysis at Takayama site, Japan. Ecological Research 21:137-149

  19. Muraoka H and Koizumi H (2006) Leaf and shoot ecophysiological properties and their role in photosynthetic carbon gain of cool-temperate deciduous forest trees. In: Kawatata H and Awaya Y (eds.) Global climate change and response of carbon cycle in the Equatorial Pacific and Indian Oceans and adjacent landmasses. Elsevier Oceanography series vol. 73, Elsevier, pp.417-443

  20. Mikami H., Nishida K. and Muraoka H. (2006) Automatic detection of forest canopy gaps and estimation of leaf area index (LAI) using the digital fish-eye camera's images. Journal of the Japan Society of Photogrammetry and Remote Sensing 45: 13-22 (in Japanese with English summary)

  21. Noda H., Muraoka H. and Washitani I. (2007) Phenological changes in respiration rate and annual carbon balance in a perennial herbaceous plant, Primula sieboldii. Journal of Plant Research 120: 375-383

  22. Muraoka H., Noda H., Uchida M., Ohtsuka T., Koizumi H. and Nakatsubo T. (2008) Photosynthetic characteristics and biomass distribution of the dominant vascular plant species in a high-arctic tundra ecosystem, Ny-Alesund, Svalbard: implications to their role in ecosystem carbon gain. Journal of Plant Research 121:137-145

  23. Shen H., Tang Y., Muraoka H. and Washitani I. (2008) Characteristics of leaf photosynthesis and simulated individual carbon budget in Primula nutans under contrasting light and temperature conditions. Journal of Plant Research 121:191-200

  24. Nasahara K.N., Muraoka H., Nagai S. and Mikami H. (2008) Vertical integration of leaf area index in a Japanese deciduous broad-leaved forest. Agricultural and Forest Meteorology 148: 1136-1146

  25. Muraoka H. and Koizumi H. (2009) "Satellite Ecology" for linking ecology, remote sensing and micrometeorology from plot to regional scales for ecosystem structure and function study. Journal of Plant Research 122: 3-20