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

Table 3. Chlorophyll fluorescence parameters (photosystem II (Fv/Fm), performance index (PI_ABS) of Populus sibirca and Ulmus pumila in different treatments measured in July, 2021 and July, 2022.

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

Species	Treatments	F₀		F _m		F _v		F_v/ F_m		PI_ABS
		July, 2021	July, 2022	July, 2021	July, 2022	July, 2021	July, 2022	July, 2021	July, 2022	July, 2021	July, 2022
Populus sibirica	CONT	443.16 ± 5.16^c	494 ± 16.43^c	2451.16 ± 125.9^abc	1860.77 ± 57.85^d	2008 ± 127.39^abcd	1356.77 ± 51.33^d	0.816 ± 0.009^ab	0.728 ± 0.009^f	3.34 ± 0.46^ab	1.15 ± 0.14^d
	2 L h⁻¹	461.11 ± 6.1^bc	504.88 ± 22.75^c	2703.66 ± 68.78^a	2024.88 ± 65.48^bcd	2242.55 ± 68.49^a	1530 ± 61.49^bcd	0.828 ± 0.01^a	0.754 ± 0.011^cde	3.87 ± 0.21^a	1.66 ± 0.22^cd
	4 L h⁻¹	462.77 ± 9.76^c	440.77 ± 10.29^c	2535 ± 88.63^ab	1984.66 ± 51.01^cd	2072.22 ± 90.21^ab	1543.88 ± 57.63^bcd	0.815 ± 0.004^ab	0.776 ± 0.009^abc	3.644 ± 0.31^a	2.77 ± 0.22^c
	8 L h⁻¹	469.11 ± 9.24^bc	476.33 ± 19.5^bc	2512.88 ± 75.96^abc	1923.77 ± 89.55^cd	2043.77 ± 80.2^abc	1447.44 ± 80.82^cd	0.811 ± 0.009^ab	0.750 ± 0.009^def	3.93 ± 0.38^a	1.73 ± 0.15^abc
	NPK	–	–	–	–	–	–	–	–	–	–
	2 L h⁻¹+NPK	491.66 ± 7.58^c	508.66 ± 21.56^bc	2007 ± 94.14^c	2359.88 ± 76.23^a	1515.33 ± 91.32^d	1851.22 ± 64.59^a	0.78 ± 0.010^bc	0.784 ± 0.007^ab	2.38 ± 0.27^bc	2.011 ± 0.22^bc
	4 L h⁻¹+NPK	482.33 ± 11.11^bc	540.66 ± 34.21^a	2214 ± 99.05^bc	2094.66 ± 104.88^bc	1731.66 ± 93.07^bcd	1554 ± 75.27^bc	0.75 ± 0.006^c	0.742 ± 0.006^ef	1.96 ± 0.24^c	1.276 ± 0.18^d
	8 L h⁻¹+NPK	487 ± 10.44^bc	459.25 ± 6.91^bc	2345.88 ± 135.09^b	2058.37 ± 53.91^bcd	1858.88 ± 127.14^bcd	1599.12 ± 52.62^bcd	0.78 ± 0.007^bc	0.776 ± 0.006^abc	2.31 ± 0.13^bc	22.324 ± 0.23^ab
	COMP	–	–	–	–	–	–	–	–	–	–
	2 L h⁻¹+COMP	538.55 ± 18.51^abc	470.11 ± 9.08^bc	2295.88 ± 68.84^abc	2338 ± 63.76^a	1757.33 ± 85.21^abcd	1867.88 ± 64.057^a	0.81 ± 0.006^ab	0.79 ± 0.007^a	2.74 ± 0.33^abc	2.47 ± 0.27^ab
	4 L h⁻¹+COMP	496 ± 9.91^bc	509.77 ± 10.19^ab	2372.22 ± 137.39^bc	2207.11 ± 58.18^ab	1876.22 ± 139.94^cd	1697.33 ± 57.35^ab	0.76 ± 0.007^c	0.77 ± 0.008b^cd	1.67 ± 0.31^c	1.75 ± 0.35^cd
	8 L h⁻¹+COMP	494 ± 11.53^bc	476.88 ± 7.04^bc	2315 ± 66.71^bc	2305.88 ± 55.81^a	1821 ± 71.62^bcd	1829 ± 56.46^a	0.78 ± 0.009^bc	0.79 ± 0.005^ab	2.12 ± 0.28^c	2.19 ± 0.27^abc
Ulmus pumila	CONT	562.14 ± 13.74^ab	506.44 ± 20.37^ab	2424.28 ± 80.31^ab	2048.88 ± 153.92^c	1862.14 ± 77.41^abc	1469.11 ± 162.31^d	0.76 ± 0.008^bc	0.71 ± 0.034^ab	1.75 ± 0.27^bcde	1.56 ± 0.42^a
	2 L h⁻¹	483.88 ± 6.92^a	530.56 ± 14.15^cd	2562.33 ± 87.57^a	2362.33 ± 97.42^abc	2078.44 ± 85.53^a	1855.88 ± 108.68^abc	0.81 ± 0.004^a	0.78 ± 0.014^bc	3.01 ± 0.19^a	2.05 ± 0.46^b
	4 L h⁻¹	479.25 ± 57.78^ab	569.55 ± 15.02^abc	2187.75 ± 279.32^ab	2209.11 ± 73.92^abc	1708.5 ± 22.012^ab	1639.55 ± 84.369^bcd	0.78 ± 0.014^abc	0.74 ± 0.014^abc	1.94 ± 0.17^bcd	1.21 ± 1.46^ab
	8 L h⁻¹	548.88 ± 23.67^ab	513.66 ± 9.59^cd	2355.44 ± 77.45^ab	2073 ± 61.82^c	1806.55 ± 86.88^abc	1559.33 ± 66.44^cd	0.77 ± 0.009^bcd	0.75 ± 0.009^ab	1.78 ± 0.21^bcde	1.59 ± 0.09^ab
	NPK	571.88 ± 11.22^ab	517.89 ± 9.89^bcd	2372.11 ± 72.15^ab	2330.33 ± 125.66^abc	1800.22 ± 78.76^abc	1812.44 ± 124.92^abc	0.75 ± 0.010^bcd	0.77 ± 0.012^ab	1.63 ± 0.45^bcdef	2.19 ± 0.31^ab
	2 L h⁻¹+NPK	645.55 ± 34.34^ab	493.55 ± 16.44^d	2253.22 ± 30.23^ab	2415 ± 128.61^ab	1607.66 ± 39.05^c	1921.44 ± 136.51^ab	0.77 ± 0.010^bc	0.78 ± 0.016^ab	2.33 ± 0.16^ab	2.39 ± 0.45^a
	4 L h⁻¹+NPK	539.33 ± 31.12^b	494.77 ± 14.39^d	2377.66 ± 54.41^b	2437.556 ± 61.67^ab	1838.33 ± 79.19^abc	1942.77 ± 68.72^ab	0.74 ± 0.007^cd	0.79 ± 0.010^a	1.11 ± 0.21^def	2.35 ± 0.39^a
	8 L h⁻¹+NPK	574.33 ± 13.04^b	497.55 ± 16.18^d	2264.33 ± 83.74^b	2489.88 ± 57.63^a	1690 ± 92.16^bc	1992.33 ± 53.11^a	0.75 ± 0.009^bc	0.79 ± 0.006^a	1.33 ± 0.32^cdef	1.917 ± 0.26^ab
	COMP	570.11 ± 19.06^b	535 ± 17.33^abcd	2268.55 ± 113.05^b	2150.44 ± 45.05^bc	1698.44 ± 111.03^c	1615.44 ± 50.73^bcd	0.72 ± 0.014^d	0.75 ± 0.010^abc	0.93 ± 0.14^ef	1.46 ± 0.46^a
	2 L h⁻¹+COMP	567 ± 35.81^b	504.33 ± 7.86^cd	2460 ± 97.32^b	2274.44 ± 95.16^abc	1893 ± 125.88^bc	1770.11 ± 99.08^abcd	0.743 ± 0.014^cd	0.77 ± 0.010^a	1.19 ± 0.07^cdef	2.04 ± 0.46^a
	4 L h⁻¹+COMP	492.22 ± 53.87^ab	492.88 ± 10.17^d	2054.44 ± 256.31^ab	2481 ± 75.83^a	1562.22 ± 207.84^ab	1988.11 ± 81.21^a	0.783 ± 0.018^ab	0.79 ± 0.009^a	2.05 ± 0.18^bc	2.28 ± 0.42^ab
	8 L h⁻¹+COMP	615.44 ± 13.01^ab	577.77 ± 27.57^a	2407.11 ± 44.08^ab	2051.22 ± 143.37^c	1791.66 ± 40.41^abc	1465.44 ± 157.42^d	0.744 ± 0.005^cd	0.69 ± 0.030^c	0.81 ± 0.16^f	1.34 ± 1.31^b

Table 3. Chlorophyll fluorescence parameters (photosystem II (Fv/Fm), performance index (PIABS) of Populus sibirca and Ulmus pumila in different treatments measured in July, 2021 and July, 2022.

Table 3. Chlorophyll fluorescence parameters (photosystem II (Fv/Fm), performance index (PI_ABS) of Populus sibirca and Ulmus pumila in different treatments measured in July, 2021 and July, 2022.