. 2023 Sep 29;11:e16107. doi: 10.7717/peerj.16107

Table 2. Leaf area (LA) and specific leaf area (SLA) of Populus sibirica and Ulmus pumila across different treatments measured in July, 2021 and July, 2022.

Different lowercase letters within each species indicate significant differences among the treatments at α = 0.05. Vertical bars represent standard errors.

Species	Treatments	LA		SLA
		July, 2021	July, 2022	July, 2021	July, 2022
Populus sibirica	CONT	8.21 ± 2.23^ab	6.98 ± 0.38^d	26.20 ± 0.62^ab	24.16 ± 0.72^c
	2 L h⁻¹	9.52 ± 2.14^ab	9.30 ± 0.76^b	25.40 ± 0.87^ab	26.75 ± 0.54^ab
	4 L h⁻¹	10.69 ± 2.86^a	8.67 ± 0.42^bc	27.95 ± 1.11^a	25.79 ± 0.60^bc
	8 L h⁻¹	10.16 ± 2.62^a	7.64 ± 0.41^cd	26.43 ± 0.87^ab	26.82 ± 0.68^ab
	NPK	–	–	–	–
	2 L h⁻¹+NPK	6.07 ± 2.02^b	8.64 ± 0.67^bc	25.99 ± 0.29^ab	28.65 ± 1.11^a
	4 L h⁻¹+NPK	8.81 ± 1.95^ab	7.08 ± 0.25^d	26.17 ± 0.37^ab	25.03 ± 0.48^bc
	8 L h⁻¹+NPK	9.91 ± 1.78^ab	9.27 ± 0.51^b	26.21 ± 0.58^ab	25.57 ± 0.31^bc
	COMP	–	–	–	–
	2 L h⁻¹+COMP	8.05 ± 3.28^ab	8.17 ± 0.48^bcd	24.71 ± 0.34^b	25.35 ± 0.88^bc
	4 L h⁻¹+COMP	8.68 ± 2.78^ab	10.81 ± 0.20^a	23.91 ± 0.40^b	24.29 ± 0.45^c
	8 L h⁻¹+COMP	8.91 ± 3.13^ab	8.83 ± 0.41^bc	26.12 ± 1.71^ab	25.03 ± 0.42^bc
Ulmus pumila	CONT	4.04 ± 0.19^c	2.55 ± 0.18^c	24.07 ± 0.81^a	26.21 ± 0.61^abc
	2 L h⁻¹	6.86 ± 0.21^a	3.17 ± 0.41^bc	19.81 ± 0.94^cd	22.36 ± 0.46^bcde
	4 L h⁻¹	5.62 ± 0.45b	2.81 ± 0.30^bc	18.21 ± 0.36^ef	28.33 ± 5.80^a
	8 L h⁻¹	3.02 ± 0.26^cd	2.38 ± 0.17^cd	21.89 ± 0.15^b	20.13 ± 0.60^def
	NPK	2.73 ± 0.37^d	1.70 ± 0.15^d	21.12 ± 0.37^bc	26.39 ± 0.41^ab
	2 L h⁻¹+NPK	5.23 ± 0.21^b	4.08 ± 0.34^a	21.06 ± 0.27^bc	24.17 ± 0.46^abcd
	4 L h⁻¹+NPK	6.12 ± 0.63^ab	3.49 ± 0.35^ab	19.15 ± 0.27^de	19.36 ± 0.31^def
	8 L h⁻¹+NPK	5.57 ± 0.40^b	3.15 ± 0.15^bc	17.38 ± 0.72^f	17.01 ± 0.36^ef
	COMP	5.72 ± 0.36^b	2.49 ± 0.16^c	21.99 ± 0.41^b	24.59 ± 1.41^abcd
	2 L h⁻¹+COMP	3.61 ± 0.19^cd	2.50 ± 0.11^c	21.47 ± 0.31^b	23.34 ± 0.57^abcd
	4 L h⁻¹+COMP	2.77 ± 0.27^d	2.87 ± 0.22^bc	14.88 ± 0.37^g	16.45 ± 0.23^f
	8 L h⁻¹+COMP	5.57 ± 0.48^b	3.58 ± 0.15^ab	20.54 ± 0.24^bcd	20.52 ± 1.47^cdef