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Ectomycorrhizal colonization and growth of the hybrid larch F₁ under elevated CO₂ and O₃.

Environmental pollution (Barking, Essex : 1987) (2014-12-19)
Xiaona Wang, Laiye Qu, Qiaozhi Mao, Makoto Watanabe, Yasutomo Hoshika, Akihiro Koyama, Korin Kawaguchi, Yutaka Tamai, Takayoshi Koike
RESUMEN

We studied the colonization of ectomycorrhizal fungi and species abundance of a hybrid larch (F1) under elevated CO₂ and O₃. Two-year-old seedlings were planted in an Open-Top-Chamber system with treatments: Control (O3 < 6 nmol/mol), O₃ (60 nmol/mol), CO₂ (600 μmol/mol), and CO2 + O₃. After two growing seasons, ectomycorrhiza (ECM) colonization and root biomass increased under elevated CO₂. Additionally, O₃ impaired ECM colonization and species richness, and reduced stem biomass. However, there was no clear inhibition of photosynthetic capacity by O₃. Concentrations of Al, Fe, Mo, and P in needles were reduced by O₃, while K and Mg in the roots increased. This might explain the distinct change in ECM colonization rate and diversity. No effects of combined fumigation were observed in any parameters except the P concentration in needles. The tolerance of F1 to O₃ might potentially be related to a shift in ECM community structure.

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