Influence of belowground nitrogen stocks on light interception and conversion of Miscanthus × giganteus

► Belowground nitrogen stocks linearly affect RUE of Miscanthus. ► Belowground nitrogen stocks affect LAI growth rate of Miscanthus. ► RUE of Miscanthus was more sensitive to low nitrogen availability than LAI. ► We determined the extinction coefficient of canopy for intercepted or absorbed PAR.