Community Structure of Arbuscular Mycorrhizal Fungi in Soils of Switchgrass Harvested for Bioenergy.

At the family level, AMF richness was a marginally significant predictor of yield at the Oregon site ( F 1,4.92 = 21.3, P = 0.006, conditional coefficient of determination [ R c 2 ] = 0.88); every additional family represented in the AMF community at the Oregon site was associated with an increase in 0.61 Mg · ha −1 of switchgrass yield ( Fig. 7 ).

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