盐碱胁迫对四翅滨藜幼苗细根生长与光合生理特性的影响

doi:10.13866/j.azr.2025.05.08

Abstract

Abstract:

To determine Atriplex canescens seedlings adaptive capacity to saline-alkali stress, a pot-controlled experiment was carried out to investigate their responses in biomass allocation, root architecture, photosynthetic physiology, and water use efficiency under gradient saline-alkali concentrations. The study found that (1) a saline-alkali stress of 0-100 mmol·L^-1, significantly increased the fine root length, fine root surface area, specific root length, specific root area, root tissue density, total root length, total root volume, total root surface area, and total root mean diameter of Atriplex canescens seedlings. (2) When the solution concentration exceeded 150 mmol·L^-1, all biomass and root metrics decreased dramatically as the saline-alkali stress concentration increased over time. (3) The net photosynthetic rate, transpiration rate, and stomatal conductance all decreased with the duration of saline-alkali stress, and the degree of decrease was positively linked with solution concentration. (4) As stress duration increased, both instantaneous and intrinsic water use efficiency improved. The study revealed the relationship between the growth of Atriplex canescens seedlings in response to different saline-alkali stress concentrations and stress durations, as well as a scientific basis for Atriplex canescens seedlings adaptive growth for saline-alkali land management.

Key words: Atriplex canescens, saline-alkali stress, seedling growth, photosynthetic physiological, water use efficiency

GU Huli, ZHOU Hai, HE Zhibin, CHEN Guopeng, REN Heng, FAN Mingyan. Effects of saline-alkali stress on the fine root growth and photosynthetic physiological characteristics of Atriplex canescens seedlings[J].Arid Zone Research, 2025, 42(5): 852-865.

Figures/Tables 10

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胁迫类型	胁迫天数/d	胁迫浓度/（mmol·L^-1）	植株平均高度/cm	土壤含盐量/%	土壤碱化度/%	土壤pH
NaCl+NaHCO₃ 复合盐碱胁迫	5	0（CK）	6.67	0.02	1.07	6.92
		50	6.84	0.06	3.26	7.08
		100	7.45	0.12	4.59	7.68
		150	6.78	0.20	5.63	7.93
		200	6.53	0.28	7.98	8.08
		250	6.36	0.37	9.26	8.44
		300	6.09	0.46	11.67	8.89
	10	0（CK）	7.79	0.03	1.15	7.03
		50	8.45	0.11	4.12	7.33
		100	8.62	0.21	6.07	7.92
		150	7.76	0.27	7.64	8.08
		200	7.83	0.39	10.42	8.63
		250	6.65	0.45	11.32	8.97
		300	6.25	0.55	13.45	9.01
	15	0（CK）	8.24	0.04	1.94	7.08
		50	10.35	0.14	4.38	7.46
		100	9.07	0.29	6.53	8.13
		150	7.80	0.38	8.03	8.27
		200	7.85	0.48	10.97	8.74
		250	7.34	0.54	11.88	9.00
		300	6.33	0.65	13.75	9.19
	20	0（CK）	9.42	0.05	2.86	7.14
		50	13.53	0.16	6.55	7.67
		100	9.92	0.35	7.53	8.22
		150	7.84	0.46	8.93	8.38
		200	7.89	0.56	11.39	8.81
		250	7.90	0.67	12.61	9.03
		300	6.57	0.76	14.42	9.38
	25	0（CK）	9.78	0.07	3.05	7.19
		50	13.60	0.18	6.64	7.82
		100	10.12	0.42	7.97	8.34
		150	8.02	0.54	9.33	8.56
		200	8.13	0.64	11.76	8.87
		250	7.97	0.72	12.97	9.15
		300	6.75	0.89	14.81	9.44
	30	0（CK）	10.01	0.09	3.26	7.23
		50	13.65	0.19	6.72	7.93
		100	10.40	0.48	8.15	8.42
		150	8.32	0.66	10.23	8.68
		200	8.43	0.76	12.03	8.91
		250	8.12	0.83	13.57	9.23
		300	6.96	1.02	15.38	9.51

指标	第一主成分	第二主成分	第三主成分	第四主成分
特征值	19.18	4.07	2.17	1.06
方差贡献率/%	63.93	13.56	7.25	3.54
累计贡献率/%	63.93	77.50	84.75	88.30

Effects of saline-alkali stress on the fine root growth and photosynthetic physiological characteristics of Atriplex canescens seedlings

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