. 2020 Jun 22;10:10038. doi: 10.1038/s41598-020-66886-x

Table 2.

Values of stomatal parameters for different nitrogen addition treatments in Manchurian ash and Mongolian oak. All data were means ± SE (n = 64).

	Manchurian ash				Mongolian oak
	PL (μm)	PW (μm)	SS (μm²)	D_s (10⁻² N cm⁻²)	PL (μm)	PW (μm)	SS (μm²)	D_s (10⁻² N cm⁻²)
CK	7.01 ± 0.70^b	3.04 ± 0.97^ab	17.57 ± 1.72^b	6.32 ± 0.45^b	6.36 ± 0.52^a	2.47 ± 0.58^b	12.78 ± 1.15^b	9.48 ± 0.45^b
LN	7.26 ± 0.14^ab	3.18 ± 0.27^a	18.10 ± 1.43^ab	8.28 ± 0.94^a	6.53 ± 0.19^a	2.54 ± 0.35^b	13.06 ± 2.20^b	11.89 ± 0.69^a
MN	7.66 ± 0.19^a	3.28 ± 0.27^a	19.74 ± 2.11^a	8.43 ± 1.14^a	6.71 ± 0.30^a	3.13 ± 0.12^a	16.52 ± 1.42^a	11.14 ± 0.26^a
HN	7.35 ± 0.05^ab	2.73 ± 0.13^b	15.74 ± 0.68^b	9.93 ± 0.90^a	6.25 ± 0.29^a	2.40 ± 0.19^b	11.81 ± 1.51^b	9.63 ± 0.69^b

Different lowercase letters (a, b, c) indicated significant differences between nitrogen addition treatments at P < 0.05. SS, stomatal opening status; PL and PW, stomatal pore length and width at the centre of the stoma; D_s, stomatal density. CK, the control; LN, low nitrogen addition; MN, medium nitrogen addition; HN, high nitrogen addition.