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. 2015 Dec 15;5:18254. doi: 10.1038/srep18254

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(a,d) The iWUE (the water use efficiency, μmol CO₂ mmol H₂O⁻¹), (b,e) NUE (the nitrogen use efficiency, μmol CO₂ mol N⁻¹) and (c,f) LUE (the light use efficiency, μmol CO₂ μmol Photons⁻¹) in the control and drought plots of Schima superba (a–c) and Pinus massoniana (d–f) are shown. The drought resistance of the (g) iWUE, (h) NUE, and (i) LUE in Schima superba and Pinus massoniana is indicated. ANOVA: *P < 0.05; **P < 0.01; and ***P < 0.001.