Table 1.

Variations in the carbon, nitrogen and carbon-to-nitrogen ratio (C/N) in the roots, stalks and leaves of Cyclocarya paliurus seedlings under five different nitrogen fertilization treatments.

Treatment	Root (%)a			Stalk (%)			Leaf (%)
	nitrogen	carbon	C/N	nitrogen	carbon	C/N	nitrogen	carbon	C/N
N1	1.11a	42.31a	38.14c	0.62a	41.90a	68.05d	2.09a	42.48b	20.42c
N2	1.54ab	41.63a	27.28b	0.87ab	41.89a	48.33c	2.78b	43.24b	15.59b
N3	1.81bc	41.28a	23.36ab	1.07b	42.06a	40.58bc	2.72b	42.39b	15.59b
N4	2.17c	39.31a	18.16a	1.39c	41.55a	30.20a	2.85b	42.57b	14.95b
N5	2.11c	41.04a	19.91a	1.38c	42.22a	30.97ab	3.23c	39.22a	12.19a

^aDifferent lowercase letters within a column indicate significant differences among nitrogen treatments in the same category according to Duncan’s test (p < 0.05). N1, N2, N3, N4 and N5 represent the concentrations of NH₄NO₃ were 0, 0.19, 0.63, 1.13 and 2.00 mM, respectively.