Eurasian journal of forest research;Vol.22


Responses of ectomycorrhizal diversity of larch and its hybrid seedlings and saplings to elevated CO2, O3, and high nitrogen loading

QU, Laiye;WANG, Xiaona;MAO, Qiaozhi;AGATHOKLEOUS, Evgenios;CHOI, DongSu;TAMAI, Yutaka;WATANABE, Toshihiro;KOIKE, Takayoshi

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JaLCDOI : 10.14943/EJFR.22.23
KEYWORDS : Elevated CO2;Ozone;nitrogen deposition, larch;hybrid larch;ectomycorrhiza (ECM)


The genus Larix (larch) is broadly distributed in northern Eurasia, including Japan and Korea. Larch species are a typical afforestation tree in northeastern China, Russia, Korea, and Japan. Larch and red pine seedlings inoculated with Pisolithus arhizus (earth-ball fungus) have increased photosynthetic rates as well as being acid-soil tolerant. Infecting P. arhizus with a variety of ectomycorrhizae (ECM) accelerated these functions. Under elevated CO2 (about 700 ppm) conditions, larch and pine seedlings infected with ECM showed no down-regulation in photosynthesis and displayed higher growth rates than those grown in ambient CO2 (380 ppm) conditions. Simulated nitrogen (N) deposition (50 kg N hr-1yr-1) increased photosynthesis and growth of F1 hybrid larch for the initial two years. There were no significant effects for the next three to eight years on Brown Forest Soil. Among the three species (Japanese, Dahurian and F1 hybrid larch), the dominant ECM species preferred N. Elevated O3 decreased growth, ECM infection rates, and ECM species diversity; however, elevated CO2 moderated or increased them in hybrid larch F 1. After elevated CO2 and O3 fumigation on F1 seedlings, we found Suillus sp., a larch specialist ECM in F1, which means these ECM will be effective materials for larch plantations.