|| 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（口頭発表） L01-06 （Oral presentation）
Ground ozone levels (O3, 0 ~ 11 km) have significantly increased over the past decades and an increase of O3 concentration has been predicted for future. Moreover, the anthropogenic nitrogen deposition has been increasing in Northern hemisphere. Especially in Asia, negative effects of O3 and (NH4)2SO4 deposition on forest ecosystem have been concerned. Previous studies have reported negative effects of elevated O3 on Japanese larch (Larix kaempferi) was moderated by NH4NO3 loading. However, the mechanism of this response is not still revealed, and further, the response of hybrid larch F1 (L. gmelinii var. japonica x L. kaempferi) is unknown. We examined combined effects of elevated O3 and (NH4)2SO4 on the growth of both larch seedlings during two growing seasons. At leaf scale, species difference in the stomatal responses to interactive effects was observed. Especially, physiological activities of hybrid larch F1 will be inhibited more than Japanese larch. At individual level, the leaf whole dry mass ratio (LWR) of hybrid larch F1 was lower than Japanese larch under (NH4)2SO4 loading. This tendency of LWR was also observed in interactive effects but not significantly. Based on these results, we may conclude the O3 sensitivity of hybrid larch F1 will be increased by (NH4)2SO4 deposition.