_____updated on 21 March 2013



Takashi S. KOHYAMA

Plant architecture / Forest tree community organization / Forest ecosystems

Affiliation

Laboratory of Terrestrial Ecology
Faculty of Environmental Earth Science, Hokkaido University
Contact

Center for Sustainability Science, Hokkaido University (concurrent)
representing the executive committee of GLP Sapporo Nodal Office

Education in charge

Course of Plant Ecology, Division of Biosphere Science
Graduate School of Environmental Science, Hokkaido University

Research interest

Wave-regenerated fir forest on Mt Shimagare (1978)

Dynamics and Maintenance Mechanisms of Forest Tree Communities and Ecosystems

    I started my research on forest community dynamics in rather simple subalpine fir forests of central Japan, and then extended to more complicated warm-temperate rain forests in southern Japan and tropical rain forests in southeast Asia. It is my purpose, as well as pleasure, to resolve the wonder of complex architecture and diversity in various natural forest systems, now endangered by human exploitation.

    It is necessary for the study of the life of forest tree species to describe not only physiological parameters but also architectural parameters of the organization of trees. The architecture of forest as a cumulative product of individual tree architecture regulates the life of individual trees. I have been analysing the species traits and interspecific interactions between co-occurring tree species in various forests in relation to the vertical structure of forest stand, and the shift of this structure due to the regeneration processes of the overall forest.

    Since 1992 (see No. 19, 22 & 23 of Publication List), I proposed a new theory that the forest-architecture-dependent competition, particularly for light resource, can promote the stationary architecture of forest and multi-species stable coexistence, which provides a view to combine traditional production ecology, population ecology and community ecology of plants. Recent version in 2006 (No. 57) simulates the stable coexistence of twelve tree species, differentiating four maximum statue classes in each of three shade-tolerance classes, in a size-structured, patch-age dynamic forest landscape (see below).

    Time course of twelve tree species system of size-structured,
    patch-dynamic forest model (ref No. 57).
    Reddish, intolerant; yellowish, subtolerant; greenish, tolerant spp.

    Undergoing change in forest ecosystems with global environmental change gives a unique lesson to all forest ecologists. I am carrying out researches on forest ecosystem monitoring alongside core projects GCTE and GLP of IGBP. I was in charge of SC IGBP for 2001-2007. Our main research sites are the Tomakomai Experimental Forest of Hokkaido University (cool-temperate deciduous forest; link to Tomakomai project page), Yakushima Island (warm-temperate rain forest), the Serimbu Station in West Kalimantan, Indonesia (tropical lowland rain forest), and the Palangka Raya Station in Central Kalimantan, Indonesia (tropical peat swamp forest). We launch plot-data network system PlotNet for facilitating data sharing and meta analysis of forest ecosystems worldwide.

    Alongside these global-change-relevant field research activities, I am organizing forest modelling project that focuses upon the functional linkage between leaf/shoot process and individual-tree process, and upon scaling up from individual-tree process to geographic vegetation dynamics. Most related papers are No. 55 & 56. t

Biography

  • 1954___ Born in Tokyo on 30 October
  • 1978___ Bachelor of Science, Faculty of Science, Tokyo Metropolitan University
  • 1980___ Master of Science, Graduate School of Science, Kyoto University
  • 1983___ Doctor of Science, Graduate School of Science, Kyoto University
  • 1983-1985___ JSPS Post-Doctoral Fellow, Kyoto University
  • 1985___ Lecturer, Faculty of Education, Kagoshima University
  • 1987___ Associate Professor, Faculty of Education, Kagoshima University
  • 1991___ Associate Professor, Center for Ecological Research, Kyoto University
  • 1991-1992___ JSPS Visiting Scholar, Department of Plant Sciences, University of Cambridge
  • 1992___ Recipient, Botanical Society Award of Young Scientists (Botanical Society of Japan)
  • 1994-2005___ Professor, Laboratory of Regional Ecosystem Science, Graduate School of Environmental Earth Science, Hokkaido University
  • 1998-1999___ Bullard Fellow, Department of Organismic and Evolutionary Biology, Harvard University
    report as a Bullard Fellow (June 1999)
  • 2000-2008___ group leader, senior researcher, and adviser, Ecosystem Change Research Program, Frontier Research Center for Global Change, JAMSTEC
  • 2005-present___ Professor, Laboratory of Terrestrial Ecology, Faculty of Environmental Earth Science, Hokkaido University (re-organization of grad. school)

Scientific publication
_________publication by Japanese is in Japanese page

Often-cited papers: * > 50; ** > 100
  1. * Kohyama, T., 1980. Growth pattern of Abies mariesii saplings under conditions of open-growth and suppression. Bot. Mag. Tokyo, 93, 13-24.
  2. * Kohyama, T. and Fujita, N., 1981. Studies on the Abies population of Mt. Shimagare I. Survivorship curve. Bot. Mag. Tokyo, 94, 55- 68.
  3. Kohyama, T., 1982. Studies on the Abies population of Mt. Shimagare II. Reproductive and life history traits. Bot. Mag. Tokyo, 95, 167-181.
  4. Kohyama, T., 1983. Seedling stage of two subalpine Abies species in distinction from sapling stage: a matter-economic analysis. Bot. Mag. Tokyo, 96, 49-65.
  5. * Kohyama, T., 1984. Regeneration and coexistence of two Abies species dominating subalpine forests in central Japan. Oecologia, 62, 156-161.
  6. Kohyama, T., 1986. Tree size structure of stands and each species in primary warm-temperate rain forests of southern Japan. Bot. Mag. Tokyo, 99, 267-279.
  7. Kohyama, T. and Hotta, M.,1986. Growth analysis of Sumatran Monophyllaea, possessing only one leaf throughout perennial life. Plant Species Biology, 1, 117-125.
  8. Kohyama, T., 1987. Stand dynamics in a primary warm-temperate rain forest analyzed by the diffusion equation. Bot. Mag. Tokyo, 100, 305-317.
  9. ** Kohyama, T., 1987. Significance of architecture and allometry in saplings. Funct. Ecol., 1, 399-404.
  10. Kohyama, T., 1988. A function describing all-sized trunk diameter distribution in warm-temperate rain forests. Bot. Mag. Tokyo, 101, 207-212.
  11. Kohyama, T., 1988. Etiology of 'Shimagare' dieback and regeneration in subalpine Abies forests of Japan. GeoJournal, 17, 201-208.
  12. Kohyama, T., 1989. Simulation of the structural development of warm-temperate rain forest stands. Ann. Bot., 63, 625-634.
  13. Kohyama, T. and Hara, T., 1989. Frequency distribution of tree growth rate in natural forest stands. Ann. Bot., 64, 47- 57.
  14. Kohyama, T., Hara, T. and Tadaki, Y., 1990. Patterns of trunk diameter, tree height and crown depth in crowded Abies stands. Ann. Bot., 65, 567-574.
  15. ** Kohyama, T. and Hotta, M., 1990. Significance of allometry in tropical saplings. Funct. Ecol., 4, 515-521.
  16. * Kohyama, T., 1991. A functional model describing sapling growth under a tropical forest canopy. Funct. Ecol., 5, 83-90.
  17. * Kohyama, T., 1991. Simulating stationary size distribution of trees in rain forests. Ann. Bot., 68, 173-180.
  18. Suzuki, E. and Kohyama, T., 1991. Spatial distribution of wind-dispersed fruits and trees of Swintonia schwenkii (Anacardiaceae) in a tropical forest of West Sumatra. Tropics, 1, 131-142.
  19. * Kohyama, T., 1992. Size-structured multi-species model of rain forest trees. Funct. Ecol., 6, 206-212.
  20. Kohyama, T., 1992. Density-size dynamics of trees simulated by a one-sided competition multi-species model of rain forest stands. Ann. Bot., 70, 451-460.
  21. Mukhtar, E., Suzuki, E., Kohyama, T. and Rahman, M., 1992. Regeneration process of a climax Calophyllum cf. soulattri in tropical rain forest of West Sumatra. Tropics, 2, 1-12.
  22. ** Kohyama, T., 1993. Size-structured tree populations in gap-dynamic forest - the forest architecture hypothesis for the stable coexistence of species. J. Ecol. 81, 131-143.
  23. Kohyama, T., 1994. Size-structure-based models of forest dynamics to interpret population- and community-level mechanisms. J. Plant Res., 107, 107-116.
  24. Kohyama, T. and Grubb, P.J., 1994. Below- and above-ground allometries of shade-tolerant seedlings in a Japanese warm-temperate rain forest. Funct. Ecol., 8, 229-236.
  25. Kohyama, T., Suzuki, E. and Hotta, M., 1994. Spatial distribution pattern of representative tree species in a foothill rain forest in West Sumatra. Tropics, 4, 1-15.
  26. Kohyama, T., 1995. Spatial and temporal patterns of subalpine Abies forests in Central Japan. In E.O. Box, ed., Vegetation Science in Forestry, pp. 391-407. Kluwer, Dordrecht.
  27. Turner, I.M., Gong, W.K., Ong, J.E., Bujang, J.S. and Kohyama, T., 1995. The architecture and allometry of mangrove saplings. Funct. Ecol., 9, 205-212.
  28. Nakashizuka, T. and Kohyama, T., 1995. The significance of the asymmetric effect of crowding for coexistence in a conifer-broadleaved forest. J. Veg. Sci., 6, 509-516.
  29. Kohyama, T. and Shigesada, N., 1995. A size-distribution-based model of forest dynamics along a latitudinal environmental gradient. Vegetatio, 121, 117-126.
  30. * Aiba, S. and Kohyama, T., 1996. Tree species stratification in relation to allometry and demography in a warm-temperate rain forest. J. Ecol., 84, 207-218.
  31. * Bellingham, P.J., Kohyama, T. and Aiba, S., 1996. The effects of a typhoon on Japanese warm- temperate rain forests. Ecological Research, 11, 229-247.
  32. Kohyama, T. and Suzuki, E., 1996. Forest architecture and dynamics in relation to biodiversity. In: Biodiversity and the dynamics of ecosystems (ed. by I.M. Turner, C.H. Doing, S.S.L. Lim and P.K.L. Ng). DIWPA Ser. 1: 103-138. National Univ. Singapore, Singapore.
  33. Kohyama, T., 1996. The role of architecture in enhancing plant species diversity. Biodiversity: an ecological perspective (ed. by T. Abe, S.A. Levin and M. Higashi), pp. 21-33. Springer, NY.
  34. Kohyama, T.,1997. Demographic explanation of tree-species diversity in rain forests. Conserving Biodiversity for Sustainable Development (ed. by P.S. Ramakrishnan, A.K. Das and K.G. Saxena), pp. 87-94. Indian National Science Academy, New Delhi.
  35. Kohyama, T. and Aiba, S., 1997. Dynamics of primary and secondary warm-temperate rain forests in Yakushima Islands. Tropics, 6, 383-392.
  36. Takahashi, T. and Kohyama, T. , 1997. Crown architecture of two understory palm species of the genus Licuala in a tropical rain forest. Plant Spec. Biol., 12, 35-41.
  37. * Aiba, S. and Kohyama, T. , 1997. Crown architecture and life-history traits of 14 tree species in a warm-temperate rain forest: significance of spatial heterogeneity. J. Ecol., 85, 611-624.
  38. Kohyama, T. and Takada, T., 1998. Recruitment rates in forest plots: Gf estimates using growth rates and size distributions. J. Ecol., 86, 633-639.
  39. Kohyama, T. Suzuki, E., Aiba, S. and Seino, T., 1999. Functional differentiation and positive feedback enhancing plant biodiversity. Biology of Biodiversity (ed. by M. Kato), pp. 179-191. Springer, Tokyo.
  40. Takahashi, K. and Kohyama, T., 1999. Size-structure dynamics of two conifers in relation to understorey dwarf bamboo: a simulation study. J. Veg. Sci., 10, 833-842.
  41. Kubo, T., Kohyama, T., Potts, M.D. and Ashton, P.S., 2000. Mortality rate estimation, when inter-census intervals vary. J. Trop. Ecol., 16, 753-756.
  42. Kohyama, T., Suzuki, E., Partomihardjo, T. and Yamada, T., 2001. Dynamic steady state of patch-mosaic tree-size structure of a mixed dipterocarp forest regulated by local crowding. Ecol. Res., 16, 85-98.
  43. Takenaka, A., Takahashi, K. and Kohyama, T., 2001. Optimal leaf display and biomass partitioning for efficient light capture in an understorey palm, Licuala arbuscula. Funct. Ecol. 15, 660-668.
  44. Takahashi, K., Seino, T., and Kohyama, T., 2001. Responses to canopy openings in architectural development of saplings in eight deciduous broad-leaved tree species. Can. J. For. Res., 31, 1336-1347.
  45. Norby, R.J., Ogle, K., Curtis. P.S., Badeck, F.-W., Huth , A., Hurtt, G.C., Kohyama, T. and Penuelas, J., 2001. Aboveground growth and competition in forest gap models: an analysis for studies of climatic change. Clim. Change, 51, 415-447.
  46. Nishimura, T.B. and Kohyama, T., 2002. Formation and maintenance of community boundaries in a sub-alpine forest landscape in norhtern Japan. J. Veg. Sci., 13, 555-564.
  47. Miyamoto, K., Suzuki, E., Kohyama, T., Seino, T., Mirmanto, E. and Simbolon, H., 2003. Habitat differentiation among tree species with small-scale variation of humus depth and topography in a tropical heath forest of Central Kalimantan, Indonesia. J. Trop. Ecol., 19, 1-13.
  48. * Kohyama, T., Suzuki, E., Partomihardjo, T., Yamada, T., and Kubo, T., 2003. Tree species differentiation in growth, recruitment and allometry in relation to maximum height in a Bornean mixed dipterocarp forest. J. Ecol., 91, 797-806.
  49. Akashi, N., Kohyama, T., and Matsui, K., 2003. Lateral and vertical crown associations in mixed forests. Ecol. Res., 18, 455-461.
  50. Rahajoe, J.S. and Kohyama, T., 2003. Effects of forest fire on leaf litter decomposition of two dominant species (Tristaniopsis obovata and Calophyllum pulcherrimum) in a heath forest of south Kalimantan. Tropics 12, 277-286.
  51. Mirmanto, E., Tsuyuzaki, S. and Kohyama, T., 2003. Investigation of the effects of distance from river and peat depth on tropical wetland forest communities. Tropics 12, 287-294.
  52. Rahajoe, J.S. and Kohyama, T., 2003. The relationship between N,P returned via litter production and nutrient use efficiency of heath and peat swamp forests in Central Kalimantan. Tropics 13, 1-8.
  53. Kohyama, T., Kubo, T. and Macklin, E., 2005. Effect of temporal autocorrelation on apparent growth rate variation in forest tree census data and an alternative distribution function of tree growth rate. Ecol. Res. 20, 11-15.
  54. Takahashi, K., Seino, T. and Kohyama, T., 2005. Plastic changes of leaf mass per area and leaf nitrogen content in response to canopy openings in saplings of eight deciduous broad-leaved tree species. Ecol. Res. 20, 17-23.
  55. Kohyama, T., 2005. Scaling up from shifting gap mosaic to geographic distribution in the modeling of forest dynamics. Ecol. Res. 20, 302-312. ____Sourse code of simulator
  56. Kubo, T. and Kohyama, T., 2005. Abies population dynamics simulated by a functional-structural tree model.. Ecol. Res. 20, 255-269.
  57. Kohyama, T., 2006. The effect of patch demography on the community structure of forest trees. Ecol. Res. 21, 346-355.____Sourse code of simulator
  58. Kohyama, T., Urabe, J., Hikosaka, K., Shibata, H., Yoshioka, T., Konohira, E., Murase, J. and Wada, E., 2007. Terrestrial ecosystems in monsoon Asia: scaling up from shoot module to watershed. In: Canadell J, Pataki D, Pitelka L (eds), Terrestrial Ecosystems in a Changing World, pp. 285-296. The IGBP Series, Springer, Berlin.
  59. Miyamoto, K., Rahajoe, J.S., Kohyama, T. and Mirmanto, E., 2007. Forest structure and primary productivity in a Bornean heath forest. Biotropica, 39, 35-42.
  60. * Sato, H., Itoh, A. and Kohyama, T., 2007. SEIB-DGVM: A new dynamic global vegetation model using a spatially explicit individual-based approach. Ecological Modelling, 200, 279-307.
  61. Nishimura, T.B., Suzuki, E., Kohyama, T. and Tsuyuzaki, S., 2007. Mortality and growth of trees in peat-swamp and heath forests in Central Kalimantan after severe drought. Plant Ecology, 186, 165-177.
  62. Shiodera, S., Rahajoe, J.S. and Kohyama, T., 2008. Variation in longevity and traits of leaves among co-occurring understorey plants in a tropical montane forest. Journal of Tropical Ecology, 24, 121-133.
  63. Kohyama, T. and Takada, T., 2009. The stratification theory for plant coexistence promoted by one-sided competition. Journal of Ecology, 97, 463-471.
  64. Iida, Y., Kohyama, T.S., Kubo, T., Kassim, A.R., Poorter, L., Sterck, F. and Potts, M.D., 2011. Tree architecture and life-history strategies across 200 co-occurring tropical tree species. Functional Ecology, 25, 1260-1268.
  65. Miyata, R., Kubo, T., Nabeshima, E. and Kohyama, T.S., 2011. Common allometric response of open-grown leader shoots to tree height in co-occurring deciduous broad-leaved trees. Annals of Botany, 108, 1279-1287.
  66. Iida, Y., Poorter, L., Sterck, F., Kassim, A. R., Kubo, T., Potts, M. & Kohyama, T. S., 2012. Wood density explains architectural differentiation across 145 co-occurring tropical tree species. Functional Ecology, 26, 274-282.
  67. Kohyama, T.S. and Takada, T., 2012. One-sided competition for light promotes coexistence of forest trees that share the same adult height. Journal of Ecology, 100, 1501-1511.
  68. Grubb, P.J., Bellingham, P.J., Kohyama, T.S., Piper, F.I. and Valido, A., 2013. Disturbance regimes, gap-demanding trees and seed mass related to tree height in warm temperate rain forests worldwide. Biological Reviews, 88, in press, doi: 10.1111/brv.12029.
  69. Orou Matilo, A.T.B., Iida, Y. and Kohyama, T.S., 2013. Tree species composition and stand structure of woody savanna in Dahomey Gap. Tropics, in press.

Contact
Takashi S. Kohyama
Faculty of Environmental Earth Science, Hokkaido University
Kita-ku, Sapporo 060-0810, Japan
Fax: +81.11.706.4954 Tel: +81.11.706.2260
Email: kohyama_[at]_ees.hokudai.ac.jp

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