Abiotic and biotic factors controlling fine root biomass, carbon and nutrients in closed-canopy hybrid poplar stands on post-agricultural land.

For nutrient content in live and dead fine roots, marginally significant or non-significant Genotype × Environment interaction effects were observed for most nutrients, and only one highly significant interaction effect was observed on dead fine root Ca content (p = 0.005) (Table 4 ).

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When data were averaged across the three seasons, a marginally significant Genotype × Environment interaction was observed for live (p = 0.05) and dead (p = 0.03) fine root biomass (Fig. 2g,h ).

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