|| 要旨トップ | 目次 |||日本生態学会第64回全国大会 (2017年3月、東京) 講演要旨
一般講演（ポスター発表） P2-M-387 （Poster presentation）
The mechanisms of biological invasion were clarified through nitrogen (N) dynamics on a succession starting on N-poor Koma volcano, Hokkaido, Japan, by evaluating differences in mycorrhizal N-transfer between native and biologically-invasive plants, and effects of invasion on litter accumulation, N-deposition in the substrates and solar radiation. N status of invasive Larix kaempferi (larch), native trees, shrubs, sedge, mycorrhizal fungi and tephra was evaluated with elevations. Mycorrhizal N-transfer was evaluated by stable N isotope ratios. The N dynamics was examined with changes in vegetation, litter and solar radiation. The dominant pioneer shrub, Salix reinii (willow), increased total N in the substrates on low-vegetated elevations. Larch changed N dependence on mycorrhizal fungi flexibly depending on N in the tephra, while native trees showed high mycorrhizal dependence independent of N in the tephra. The abundance of larch caused thick litter and intercepted solar radiation, reducing the dominance of willow. The flexibility of larch to mycorrhizal fungi for N-uptake promoted the biological invasion. The contributor to N-deposits in the tephra was a native willow shrub, although the deposit was weakened by the biological invasion. Therefore, the mycorrhizal N-transfer to plants was a key to determine the successional sere and belowground N dynamics.