Atom 13 C -13 C abundance; Atom 15 N -15 N abundance; Ci -intercellular CO2 concentration; Con 13 C -13 C absolute abundance; Con 15 N -15 N absolute abundance; DAT -days after temperature and nitrogen application treatment; E -transpiration rate; Fv/Fm -maximum quantum efficiency of PSII photochemistry; gs -stomatal conductance; PN -net photosynthetic rate; qP -photochemical quenching coefficient; YII -quantum efficiency of PSII; YNPQ -quantum yield of regulated energy dissipation of PSII; δ 13 C -amount of fixed 13 C assimilates; δ 15 N -amount of fixed 15 N assimilates.

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