添加膨润土对风蚀沙化土壤理化性质及植被生长的影响

doi:10.13866/j.azr.2025.03.06

Abstract

Abstract:

Desertification is a serious environmental problem globally, severely restricting the sustainable development of regional economies. In recent years, clay minerals have been widely used for improving wind-eroded and sandy soil, and bentonite with its unique 2:1 layered structure has particularly good prospects for application in the improvement of wind-eroded and sandy soil. In this study, the effects of different proportions of bentonite [without bentonite addition (B0), 2% bentonite addition (B2), and 4% bentonite addition (B4)] on the physical and chemical properties of wind-eroded and desertified soil and plant growth were studied. The results showed the following: (1) Bentonite addition increased the content of fine-grained soil and improved the soil’s water retention and water holding capacity (12%-88%). (2) The shear strength of wind-eroded and sandy soil supplemented with B2 and B4 bentonite was increased by 150% and 205%, respectively, compared with that upon B0 treatment. (3) Bentonite addition can lead to crust formation on the sandy surface, which is beneficial for sand fixation. (4) Among the treatments, B4 bentonite addition significantly increased plant coverage, biomass, and plant height by 32%-33%, 56%-85%, and 71%-107%, respectively. In summary, the addition of bentonite not only improved the soil’s water retention capacity, improved the soil’s physical properties, and fixed the sandy surface, but also promoted plant growth.

Key words: sandy soil amelioration, soil moisture conservation, soil shear resistance strength, sand stabilization mechanisms

LIU Quanyu, LI Congjuan, LI Guizhen. Effects of addition of the bentonite on the physicochemical properties and vegetation growth of wind-eroded sandy soil[J].Arid Zone Research, 2025, 42(3): 456-466.

Figures/Tables 13

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矿物组成/%						胶质价/（mL·g^-1）	膨胀容/（mL·g^-1）	膨润值/（mL·g^-1）	吸蓝量/（mL·g^-1）
SiO₂	Al₂O₃	Na₂O	MgO	Fe₂O₃	K₂O	胶质价/（mL·g^-1）	膨胀容/（mL·g^-1）	膨润值/（mL·g^-1）	吸蓝量/（mL·g^-1）
68.3	7.1	3.5	2.7	2.5	1.1	52.0	57.0	22.0	39.7

处理	膨润土质量分数/%	管理方法
风沙地原生环境对照（CK）	0.0%	无
0%空白对照（B0）	0.0%	浇水
2%膨润土（B2）	2.0%	浇水+膨润土
4%膨润土（B4）	4.0%	浇水+膨润土

处理	黏粒	粉粒	砂粒		分型维数
处理	<2/μm	2~50/μm	50~100/μm	100~250/μm	分型维数
B0	1.9±0.1b	80.6±1.5a	17.0±1.5a	0.5±0.1a	2.0±0.3a
B2	3.1±0.7a	80.2±0.5a	16.2±1.1a	0.5±0.1a	2.1±0.6a
B4	3.1±0.5ab	79.2±2.7a	16.8±2.3a	0.9±0.8a	2.1±0.5a

Effects of addition of the bentonite on the physicochemical properties and vegetation growth of wind-eroded sandy soil

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