Coordinated responses of hydraulic architecture and photosynthetic characteristics in Fraxinus mandschurica seedlings to change of light intensity irradiance

doi:10.12302/j.issn.1000-2006.202106018

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (1): 83-91.doi: 10.12302/j.issn.1000-2006.202106018

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Coordinated responses of hydraulic architecture and photosynthetic characteristics in Fraxinus mandschurica seedlings to change of light intensity irradiance

KONG Xin¹^,²(), WANG Aiying³(), HAO Guangyou¹^,^*(), NING Qiurui¹^,², WANG Miao¹^,², YIN Xiaohan¹^,⁴, ZHOU Yongjiao¹^,²

1. Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. Liaoning Key Laboratory of Urban Pest Management and Biosafety, School of Life Science and Engineering, Shenyang University, Shenyang 110044, China
4. Forest Ecology and Forest Management Group,Wageningen University, Wageningen 476700, Netherlands
4. Forest Ecology and Forest Management Group, Wageningen University, Wageningen 476700, Netherlands

Received:2021-06-11 Accepted:2022-04-12 Online:2023-01-30 Published:2023-02-01
Contact: HAO Guangyou E-mail:3160563672@qq.com;aiyingwqepq@163.com;haogy@iae.ac.cn

Abstract

Abstract:

【Objective】 This study aims to explore the response and adaptive mechanisms of Fraxinus mandschurica to different light intensities, to provide a basis for reforestation and forest regeneration. 【Method】 Two-year-old potted Fraxinus mandschurica seedlings were grown under four different light treatments (100%, 60%, 30%, and 15% of full sunlight). The photosynthetic and hydraulic characteristics of the seedlings were then measured. 【Result】 Shading treatments significantly affected the growth, photosynthesis, and hydraulics of Fraxinus mandschurica seedlings. Seedlings had a higher stomatal conductance (G_s), net photosynthetic rate (P_n), hydraulic conductance of root (K_root), shoot (K_shoot), and whole plant (K_plant) under 100% relative light intensity than under 60% and 30% relative light intensities. With a decrease in light intensity, the growth rate, ratio of root mass (R_MR), maximum net photosynthetic rate (P_n,max), light saturation point (L_SP), and light compensation point (L_CP) decreased, while the ratio of stem mass (S_MR) and leaf mass (L_MR) and apparent quantum yield (A_QY) increased. Xylem anatomies were significantly different among the three light treatments. For example, the vessel density was significantly higher in the 100% than in the 30% and 60% relative light intensities, but the vessel diameter was significantly lower in the 100% than in the 30% and 60% light treatments. 【Conclusion】 Even though Fraxinus mandschurica was able to slightly adapt to low-light conditions by adjusting its morphology, photosynthesis, and hydraulic characteristics, it mostly had a high demand for light during its seedling stage. There was a coupling between the hydraulic architecture and photosynthetic characteristics in response to changes in the light intensity. The photosynthetic and hydraulic characteristics of Fraxinus mandschurica seedlings showed relatively larger plasticity with changes in light treatment. Relatively larger plastic adjustments of functional traits can contribute to greater fitness in heterogeneous light environments of the forest understory, which has great significance for the regeneration of Fraxinus mandshurica seedlings in natural forests.

Key words: Fraxinus mandschurica seedling, shade tolerance, light intensity, phenotypic plasticity, photosynthetic characteristic, hydraulic trait

CLC Number:

S718

KONG Xin, WANG Aiying, HAO Guangyou, NING Qiurui, WANG Miao, YIN Xiaohan, ZHOU Yongjiao. Coordinated responses of hydraulic architecture and photosynthetic characteristics in Fraxinus mandschurica seedlings to change of light intensity irradiance[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2023, 47(1): 83-91.

Figures/Tables 3

Table 1

The growth, biomass allocation and photosynthetic characteristics of Fraxinus mandshurica seedlings grown under different light treatments"

项目item	功能性状 functional trait	相对光强relative light intensity				P	P_i
项目item	功能性状 functional trait	100%	60%	30%	15%	P	P_i
形态特征 morphological characteristics	株高/cm height	67.30±5.10 a	74.5±5.06 a	28.73±1.33 b	30.53±1.92 b	<0.001	0.61
	基径/mm basal diameter	9.37±0.53 a	8.56±0.46 a	4.62±0.60 b	4.58±0.14 b	<0.001	0.51
	叶片大小/cm²leaf size	57.65±12.28 a	86.35±9.52 a	65.50±1.33 a	57.03±9.05 a	0.153	0.34
	总叶面积/ cm²leaf area	1 384.17±7.38 a	1 821.39±243.78 a	704.25±159.28 b	532.88±43.17 b	0.001	0.71
	比叶面积/ (cm²·g^-1) specific leaf area	123.57±9.26 c	304.48±22.03 b	464.63±21.53 a	471.69±12.64 a	<0.001	0.74
	平均mean						0.58
生物量积累 biomass accumulation	根生物量/ g root biomass	35.22±2.50 a	10.51±0.77 b	2.29±0.56 c	2.41±0.24 c	<0.001	0.93
	粗根生物量/g coarse root biomass	17.88±1.79 a	5.81±0.30 b	1.11±0.34 c	1.20±0.12 c	<0.001	0.93
	细根生物量/g fine root biomass	17.34±1.19 a	4.69±0.48 b	1.18±0.22 c	1.21±0.13 c	<0.001	0.93
	茎生物量/g stem biomass	12.69±1.79 a	6.98±0.72 b	1.69±0.36 c	1.64±0.14 c	<0.001	0.87
	叶生物量/g leaf biomass	11.32±0.78 a	5.96±0.54 b	1.53±0.38 c	1.13±0.10 c	<0.001	0.90
	叶柄生物量/g petiole biomass	2.72±0.12 a	1.65±0.13 b	0.35±0.08 c	0.28±0.05 c	<0.001	0.90
	地上生物量/g aboveground biomass	26.72±2.23 a	14.59±1.31 b	3.56±0.80 c	3.05±0.27 c	<0.001	0.89
	总生物量/g total biomass	61.94±4.40 a	25.10±2.01 b	5.85±1.36 c	5.47±0.50 c	<0.001	0.91
	平均mean						0.91
生物量分配 biomass allocation	根生物量占比root mass ratio	0.57±0.02 a	0.42±0.01 bc	0.39±0.01 c	0.44±0.01 b	<0.001	0.30
	茎生物量占比stem mass ratio	0.20±0.01 b	0.28±0.01 a	0.29±0.02 a	0.30±0.01 a	<0.001	0.33
	叶生物量占比leaf mass ratio	0.19±0.02 c	0.24±0.01 ab	0.26±0.01 a	0.21±0.00 bc	0.006	0.28
	地上生物量占比aboveground mass ratio	0.43±0.02 c	0.58±0.01 ab	0.61±0.01 a	0.56±0.01 b	0.003	0.29
	根冠比root shoot ratio	3.14±0.30 a	1.78±0.13 bc	1.50±0.03 c	2.13±0.04 b	0.001	0.52
	平均mean						0.34
光合生理 photosynthetic characteristics	A_QY	0.06±0.01 c	0.09±0.01 b	0.11±0.00 a	—	0.001	0.45
	R_d/(μmol·m^-2·s^-1)	0.82±0.04 b	0.87±0.03 ab	0.95±0.00 a	—	0.065	0.14
	P_n,max/(μmol·m^-2·s^-1)	7.55±0.03 a	3.46±0.01 c	3.57±0.00 b	—	<0.001	0.54
	L_cp/ (μmol·m^-2·s^-1)	12.87±1.02 a	10.26±0.93 ab	8.40±0.00 b	—	0.021	0.35
	L_sp/ (μmol·m^-2·s^-1)	380.00±61.12 a	100.78±1.62 b	117.43±9.64 b	—	0.002	0.73
	P_n/ (μmol·m^-2·s^-1)	6.19±0.17 a	1.29±0.01 b	0.53±0.01 b	—	0.001	0.91
	G_s/ (mol·m^-2·s^-1)	0.10±0.01 a	0.03±0.00 b	0.01±0.00 b	—	0.001	0.90
	平均mean						0.57

Table 1

Fig.1

Fig.2

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Coordinated responses of hydraulic architecture and photosynthetic characteristics in Fraxinus mandschurica seedlings to change of light intensity irradiance

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