|| 要旨トップ | 本企画の概要 |||日本生態学会第65回全国大会 (2018年3月、札幌) 講演要旨
シンポジウム S14-3 （Presentation in Symposium）
We exposed Japanese larch (Larix kaempferi) container-grown seedlings to single or combinational treatments of ambient or elevated ozone, low or high fertilization, and ectomycorrhizae (ECM) inoculation or no ECM inoculation for about two months. Ozone induced high visible injuries and highly decreased stem diameter, root length, and the product of root length and root width, root fresh and dry weights, stem and branches dry weight, needles dry weight, total plant dry weight and root/needle ratio. Ozone also increased the buds per plant dry weight, suggesting plants under ozone pressure allocated more resources to re-production. High fertilization nearly doubled root fresh and dry weights, highly increased stem and branches fresh and dry weights, total plant dry weight, number of buds, and buds per root dry weight. High fertilization had no effect on root/shoot or root/needles ratio, suggesting it was not above the threshold for causing imbalance in plant growth. High fertilization also led to taller stem and more lateral branches. Elevated ozone and low fertilization had a synergistic negative effect on plant productivity. The effects of ECM on growth, productivity, gas exchange and nutrition will be further analyzed, and the interactive effects of ozone, fertilization, and ectomycorrhizae treatments will be evaluated.