The growth and photosynthetic characteristics of Acer truncatum seedlings in response to soil water and fertilizer coupling

doi:10.12302/j.issn.1000-2006.202302008

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2024, Vol. 48 ›› Issue (5): 113-122.doi: 10.12302/j.issn.1000-2006.202302008

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The growth and photosynthetic characteristics of Acer truncatum seedlings in response to soil water and fertilizer coupling

LI Panting(), DU Manyi, WANG Yue, PEI Shunxiang, XIN Xuebing^*()

Experimental Centre of Forestry in North China,Chinese Academy of Forestry, Beijing 102300,China

Received:2023-02-07 Revised:2023-04-06 Online:2024-09-30 Published:2024-10-03
Contact: XIN Xuebing E-mail:pantin09@163.com;xinxb01@163.com

Abstract

Abstract:

【Objective】 This research aims to investigate the growth and photosynthetic physiological characteristics of Acer truncatum seedlings in response to water-fertilizer coupling, and to analyze the optimal water-fertilizer combination for the growth of A. truncatum seedlings. 【Method】 One-year-old A. truncatum seedlings were subjected to varying water and fertilizer couplings in an orthogonal test design involving four factors and four levels of soil water content, nitrogen, phosphorus and potassium, resulting in 16 treatments. Growth indexes, relative chlorophyll content of the leaves SPAD values, photosynthetic characteristics, and light response curves were measured after the treatments. 【Result】 The growth indices generally increased firstly and then decreased with increasing fertilization amount. At a soil water content of 75%,1.2, 1.8 and 0 g/plant of N, P, K, respectively, the diameter and total biomass of the plant were significantly higher than those of other treatments. Suitable soil water and fertilizer coupling could significantly improve the height, ground diameter, and total biomass of A. truncatum seedlings. Moreover, there was no significant difference in the utilization ability of low light among different soil water and fertilizer coupling treatments, and nitrogen fertilizer had significant effects on the maximum net photosynthetic rate and light saturation point of A. truncatum seedlings. In addition, there was no significant difference in water use efficiency (WUE) between the different treatments for A. truncatum seedlings. The seedlings grew normally even under lower water conditions, such as 45% soil water content, and exhibited strong drought resistance. The effects of soil water and fertilizer on the growth of A. truncatum seedlings were ranked from high to low as nitrogen fertilizer > soil water content > potash fertilizer > phosphate fertilizer, based on a comprehensive scoring method. The optimal combination of water and fertilizer was 75% soil water content, with fertilizer comprising 1.2 g of nitrogen, 1.8 g of phosphorous, and 0 g of potassium per plant. 【Conclusion】 Water-fertilizer coupling had a significant effect on ground diameter and biomass of A. truncatum seedlings, but an insignificant effect on seedling height, while soil water content and nitrogen fertilizer also had a significant effect on the growth indexes of the seedlings. These findings provide a theoretical basis for the appropriate use of soil water and fertilizer in A. truncatum.

Key words: Acer truncatum, water and fertilizer coupling, photosynthetic characteristics, growth index

CLC Number:

S723

LI Panting, DU Manyi, WANG Yue, PEI Shunxiang, XIN Xuebing. The growth and photosynthetic characteristics of Acer truncatum seedlings in response to soil water and fertilizer coupling[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2024, 48(5): 113-122.

Figures/Tables 8

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处理号 treatment No.		苗高/cm seedling height	地径/mm ground diameter	地上干质量/g dry weight of shoots	根系干质量/g dry weight of roots	总生物量/g total biomass
T1		28.26±0.49 a	2.94±0.08 bc	1.32±0.39 bc	3.38±0.26 bc	4.69±0.61 abc
T2		28.78±0.38 a	3.01±0.04 b	1.54±0.03 abc	3.43±0.37 bc	4.96±0.37 bc
T3		28.66±0.73 a	3.01±0.04 b	1.18±0.13 bc	3.40±0.57 bc	4.58±0.64 abc
T4		27.43±0.16 a	2.85±0.03 c	1.00±0.15 c	2.70±0.22 c	3.70±0.35 d
T5		28.70±0.91 a	2.98±0.10 bc	1.90±0.32 a	3.61±0.59 b	5.51±0.70 b
T6		28.68±1.17 a	2.92±0.08 bc	1.26±0.45 bc	3.07±0.20 bc	4.33±0.63 cd
T7		28.20±0.48 a	2.90±0.03 bc	1.26±0.43 bc	2.96±0.80 bc	4.22±1.17 cd
T8		27.68±1.18 a	2.87±0.01 c	1.19±0.22 bc	2.71±0.37 c	3.90±0.59 cd
T9		28.41±0.77 a	2.92±0.08 bc	1.70±0.18 ab	3.01±0.55 bc	4.71±0.67 abc
T10		28.48±1.07 a	2.87±0.07 c	1.36±0.54 bc	3.03±0.24 bc	4.38±0.46 cd
T11		28.29±0.88 a	2.95±0.12 bc	1.38±0.18 bc	2.95±0.24 bc	4.33±0.36 cd
T12		28.07±1.42 a	2.87±0.07 c	1.21±0.06 bc	3.09±0.53 bc	4.30±0.57 cd
T13		28.49±1.38 a	2.95±0.09 bc	1.92±0.30 a	4.75±0.41 a	6.67±0.63 a
T14		28.74±1.27 a	3.29±0.11 a	2.01±0.64 a	5.06±0.17 a	7.07±0.81 a
T15		27.72±0.72 a	2.94±0.08 bc	1.17±0.14 bc	3.57±0.65 b	4.74±0.65 abc
T16		27.23±0.14 a	2.95±0.06 bc	1.04±0.06 c	3.33±0.66 bc	4.36±0.64 cd
	W	0.32	9.80^***	2.05	21.25^***	14.93^***
	N	4.09^*	9.29^***	11.72^***	9.00^***	14.78^***
F值 F-value	P	0.30	8.15^***	2.16	1.67	2.76
	K	0.28	4.23^*	1.55	3.67^*	3.77^*
	W×N×P×K	0.68	6.69^**	2.67	3.94^*	4.42^**

处理号 treatment No.		净光合速率/ (μmol·m^-2·s^-1) P_n	蒸腾速率/ (mmol·m^-2·s^-1) T_r	气孔导度/ (mmol·m^-2·s^-1) G_s	胞间CO₂浓度/ (μmol·mol^-1) C_i	水分利用效率/ (mmol·mol^-1) WUE
T1		3.28±1.22 abc	1.44±0.70 abcd	0.04±0.01 abcd	238.01±32.63 ab	2.49±1.01 a
T2		4.38±1.26 a	1.71±1.00 ab	0.04±0.01 abc	213.56±16.77 ab	2.95±0.92 a
T3		1.43±1.13 bc	0.57±0.15 efg	0.02±0.01 cd	258.72±48.53 a	2.39±1.45 a
T4		1.40±0.37 bc	0.54±0.15 fg	0.01±0.00 d	192.46±43.00 ab	2.59±0.36 a
T5		3.31±1.97 abc	1.58±0.87 abc	0.04±0.03 ab	260.98±37.95 a	2.16±0.48 a
T6		3.42±1.26 ab	1.39±0.38 abcdef	0.04±0.02 abcd	236.93±46.62 ab	2.46±0.73 a
T7		2.53±1.67 abc	0.99±0.53 bcdefg	0.02±0.01 bcd	245.01±47.38 ab	2.49±1.52 a
T8		1.32±0.33 c	0.58±0.27 efg	0.01±0.01 cd	210.20±79.43 ab	2.89±2.07 a
T9		3.67±1.22 a	1.57±0.44 abc	0.04±0.02 abc	244.07±32.70 ab	2.40±0.73 a
T10		3.30±0.82 abc	1.41±0.64 abcde	0.03±0.01 abcd	223.88±14.89 ab	2.69±1.36 a
T11		2.38±0.74 abc	0.76±0.40 cdefg	0.02±0.01 bcd	161.51±71.96 b	3.54±1.07 a
T12		1.35±0.79 c	0.52±0.21 g	0.01±0.00 d	174.82±91.66 ab	3.19±2.36 a
T13		4.19±1.46 a	2.05±0.44 a	0.05±0.03 a	248.49±59.26 ab	2.12±0.83 a
T14		4.21±1.22 a	2.18±0.63 a	0.04±0.01 ab	226.02±30.43 ab	2.02±0.66 a
T15		3.50±1.88 a	1.08±0.35 bcdef	0.03±0.02 abcd	193.19±93.94 ab	3.30±1.36 a
T16		1.42±0.97 bc	0.66±0.25 defg	0.01±0.00 cd	236.89±67.40 ab	2.46±1.82 a
	W	1.23	0.67	1.46	1.24	0.70
	N	13.62^***	5.07^***	12.01^***	1.81	0.53
F值 F-value	P	0.57	0.12	0.32	0.56	0.70
	K	1.06	0.19	0.33	1.26	0.79
	W×N×P×K	0.29	0.08	0.04	0.67	0.90

指标	P_n	T_r	G_s	C_i	WUE
P_n	1
T_r	0.943^**	1
G_s	0.946^**	0.965^**	1
C_i	0.283	0.432	0.492	1
WUE	-0.289	-0.535^*	-0.507^*	-0.853^**	1

处理号 treatment No.		表观量子效率 AQY		P_n,max/ (μmol·m^-2·s^-1)		光饱和点/ (μmol·m^-2·s^-1) LSP		光补偿点/ (μmol·m^-2·s^-1) LCP		暗呼吸速率/ (μmol·m^-2·s^-1) dark respiration
T1		0.05±0.02 abc		3.27±0.57 bcde		769.41±198.55 de		14.58±1.30 b		0.62±0.12 a
T2		0.07±0.02 ab		5.58±1.36 abc		1 164.69±71.57 a		9.43±5.42 b		0.56±0.36 a
T3		0.03±0.01 c		2.54±1.72 cde		845.71±69.39 bcde		24.02±20.86 ab		0.39±0.20 a
T4		0.04±0.03 bc		1.31±1.08 e		566.13±116.64 e		20.56±15.28 ab		0.48±0.54 a
T5		0.08±0.00 a		6.32±0.45 ab		841.71±33.94 bcde		6.13±1.34 b		0.46±0.08 a
T6		0.05±0.02 abc		3.97±0.97 abcde		1 096.23±287.48 abc		11.35±6.80 b		0.52±0.29 a
T7		0.04±0.02 bc		2.53±1.14 cde		861.27±292.45 bcde		11.44±5.47 b		0.31±0.12 a
T8		0.06±0.01 abc		1.86±0.74 de		683.31±198.36 de		10.94±5.22 b		0.51±0.25 a
T9		0.04±0.01 bc		4.64±2.48 abcd		1 114.50±203.82 ab		15.72±8.99 b		0.59±0.25 a
T10		0.04±0.02 bc		3.11±1.34 cde		821.61±104.72 bcde		18.00±9.86 ab		0.55±0.08 a
T11		0.04±0.03 bc		3.71±2.50 abcde		864.43±59.74 bcde		12.97±9.63 b		0.36±0.25 a
T12		0.04±0.01 bc		2.16±1.32 de		602.82±48.22 de		15.39±5.10 b		0.43±0.06 a
T13		0.06±0.03 ab		6.52±2.89 a		888.43±92.48 abcd		14.49±10.01 b		0.73±0.25 a
T14		0.05±0.01 abc		6.83±3.09 a		1 165.89±47.41 a		20.48±11.50 ab		0.88±0.42 a
T15		0.06±0.02 abc		3.36±0.61 bcde		751.90±98.55 de		7.87±4.04 b		0.38±0.17 a
T16		0.05±0.01 abc		0.89±0.47 e		816.97±155.94 cde		39.01±29.47 a		0.85±0.56 a
	W		2.00		1.23		0.46		1.66	1.91
	N		2.54		12.64^***		13.76^***		1.32	2.07
F值 F-value	P		1.64		1.68		2.60		1.58	0.57
	K		1.69		1.30		0.49		1.57	0.16
	W×N×P×K		0.77		2.10		4.66^***		0.55	0.12

处理号 treatment No.	根冠比 root-shoot ratio	高径比 height- diameter ratio	总生物量 total biomass	SPAD值 SPAD value	P_n	水分利用效率 WUE	P_n,max	光饱和点 LSP	综合得分 comprehensive score
T1	0.68	0.27	0.29	0.06	0.64	0.31	0.40	0.34	0.45
T2	0.31	0.31	0.38	0.52	1.00	0.61	0.79	1.00	0.74
T3	0.77	0.33	0.26	0.28	0.04	0.24	0.28	0.47	0.29
T4	0.66	0.26	0.00	0.00	0.03	0.38	0.07	0.00	0.13
T5	0.12	0.23	0.54	0.12	0.65	0.10	0.91	0.46	0.57
T6	0.63	0.07	0.19	0.46	0.69	0.29	0.52	0.88	0.55
T7	0.44	0.17	0.15	0.22	0.40	0.31	0.28	0.49	0.33
T8	0.36	0.23	0.06	0.12	0.00	0.57	0.16	0.20	0.18
T9	0.00	0.15	0.30	0.33	0.77	0.25	0.63	0.91	0.55
T10	0.68	0.00	0.20	0.50	0.65	0.44	0.37	0.43	0.46
T11	0.26	0.29	0.19	0.51	0.35	1.00	0.48	0.50	0.44
T12	0.53	0.11	0.18	0.40	0.01	0.77	0.21	0.06	0.23
T13	0.50	0.22	0.88	0.36	0.94	0.07	0.95	0.54	0.74
T14	0.66	1.00	1.00	1.00	0.94	0.00	1.00	1.00	0.86
T15	0.91	0.42	0.31	0.81	0.71	0.84	0.42	0.31	0.55
T16	1.00	0.58	0.20	0.71	0.03	0.29	0.00	0.42	0.23

The growth and photosynthetic characteristics of Acer truncatum seedlings in response to soil water and fertilizer coupling

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处理号 treatment No.	土壤含水率/% soil water content	施肥量/(g·株^-1) fertilizer amount
处理号 treatment No.	土壤含水率/% soil water content	N	P	K
T1	45	0.0	0.0	0.0
T2	45	1.2	0.9	0.6
T3	45	2.4	1.8	1.2
T4	45	3.6	2.7	1.8
T5	55	0.0	0.9	1.2
T6	55	1.2	0.0	1.8
T7	55	2.4	2.7	0.0
T8	55	3.6	1.8	0.6
T9	65	0.0	1.8	1.8
T10	65	1.2	2.7	1.2
T11	65	2.4	0.0	0.6
T12	65	3.6	0.9	0.0
T13	75	0.0	2.7	0.6
T14	75	1.2	1.8	0.0
T15	75	2.4	0.9	1.8
T16	75	3.6	0.0	1.2

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