- 2018 - 2022 Range expansion of an invasive pioneer tree Litsea cubeba and its impact on the regeneration of native species
- 2006 - 2008 Factors affecting seed set in Aesculus turbinata
- 2003 - 2005 Effects of the ratio of available light and nitrogen on the growth of tree seedlings
- 2002 - 2004 Analyses on the pollination system of tree species with various regeneration characteristics
- 2000 - 2002 Evaluaation of gene flow and reproduction cost in a tree population
- 1996 - 1998 The role of dioecious species on the regeneration dynamics and species
- 1994 - 1994 クロマツの養分利用効率の立地条件に対する可塑性
- 1993 - 1994 Elucidation of the Missing Sink in the Global Carbon Cycling
- 1992 - 1994 Regeneration dynamics and meintenance mechanism of forest community
- 1993 - 1993 森林土壌へのリター養分供給様式とその実生更新への影響
- 1990 - 1992 Forest hydrological and ecological study on the effects of forest type and its stand age on the quality and quantity of forest runoff water
- 1989 - 1991 Chemical Ecology of an Invader (Podocarpus Nagi)
- 1988 - 1989 森林生態系の発達過程における炭素循環の動態
- 森林生態系の物質循環と更新動態
- Community turnover and nutrient dynamics in forest ecosystem
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