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

干旱区研究 ›› 2025, Vol. 42 ›› Issue (5): 852-865.doi: 10.13866/j.azr.2025.05.08 cstr: 32277.14.AZR.20250508

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

顾虎利¹^,²(), 周海¹(), 何志斌¹, 陈国鹏², 任珩¹, 范明彦¹^,³

1.中国科学院西北生态环境资源研究院，中国生态系统研究网络临泽内陆河流域研究站，干旱区生态安全与可持续发展全国重点实验室，甘肃兰州 730000
2.甘肃农业大学林学院，甘肃兰州 730070
3.青海大学，省部共建三江源生态与高原农牧业国家重点实验室，青海西宁 810016

收稿日期:2024-12-09 修回日期:2025-01-08 出版日期:2025-05-15 发布日期:2025-10-22
通讯作者: 周海. E-mail: zhouhai1201@lzb.ac.cn
作者简介:顾虎利（1999-），男，硕士研究生，主要从事干旱区植物生态研究. E-mail: guhuli2023@163.com
基金资助:
国家自然科学基金面上项目(32171876);甘肃省重点研发计划(22ZD6WA036)

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

GU Huli¹^,²(), ZHOU Hai¹(), HE Zhibin¹, CHEN Guopeng², REN Heng¹, FAN Mingyan¹^,³

1. Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Linze Inland River Basin Research Station, Chinese Ecosystem Research Network, State Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands, Lanzhou 730000, Gansu, China
2. College of Forestry, Gansu Agricultural University, Lanzhou 730070, Gansu, China
3. State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining 810016, Qinghai, China

Received:2024-12-09 Revised:2025-01-08 Published:2025-05-15 Online:2025-10-22

摘要/Abstract

摘要：

为揭示四翅滨藜（Atriplex canescens）幼苗对盐碱胁迫的适应能力，采用盆栽控制试验方法，研究四翅滨藜幼苗生物量、根系生长、光合生理特性、水分利用效率对不同浓度盐碱胁迫的响应。结果表明：（1） 0~100 mmol·L^-1盐碱溶液胁迫下，对四翅滨藜幼苗细根长度、细根表面积、比根长、比根面积、根组织密度、总根系长度、总根体积、总根表面积和总根平均直径均有显著促进作用。（2）溶液浓度大于150 mmol·L^-1后，随着盐碱胁迫浓度增加与胁迫时间延长，各项生物量和根系参数均显著减小。（3）随着盐碱胁迫时间延长，净光合速率、蒸腾速率和气孔导度持续下降，下降程度与溶液浓度呈正相关。（4）瞬时水分利用效率和内在水分利用效率随着胁迫时长逐渐增大。研究揭示了四翅滨藜幼苗在应对不同浓度盐碱胁迫与不同胁迫时长下的生长关系，为盐碱地治理提供四翅滨藜幼苗适应性生长的科学依据。

关键词: 四翅滨藜, 盐碱胁迫, 幼苗生长, 光合生理, 水分利用效率

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

顾虎利, 周海, 何志斌, 陈国鹏, 任珩, 范明彦. 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[J]. 干旱区研究, 2025, 42(5): 852-865.

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.

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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

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

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

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