Effects of addition of the bentonite on the physicochemical properties and vegetation growth of wind-eroded sandy soil
Received date: 2024-12-03
Revised date: 2024-12-24
Online published: 2025-08-13
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.
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 . DOI: 10.13866/j.azr.2025.03.06
图1 研究区概况图注:底图采用新疆维吾尔自治区自然资源厅标准地图制作,审图号为新S(2023)064号,对底图边界无修改。下同。 Fig. 1 Summary map of the study area |
表1 膨润土理化性质Tab. 1 Physical and chemical properties of bentonite |
| 比表面积/(m2·g-1) | 平均空隙宽度/nm | 总孔容积/(cm2·g-1) | 含水量/% | pH | EC/(mS·cm-1) |
|---|---|---|---|---|---|
| 7.9 | 2.0 | 0.2 | ≤14 | 8.4 | 2.3 |
表2 膨润土矿物组成与物理性质Tab. 2 Mineral composition and physical properties of bentonite |
| 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 | ||||
| 68.3 | 7.1 | 3.5 | 2.7 | 2.5 | 1.1 | 52.0 | 57.0 | 22.0 | 39.7 |
表3 膨润土物料配比和管理方法Tab. 3 Bentonite material ratio and management method |
| 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 |
表4 不同膨润土处理下土壤颗粒组成和分形维数Tab. 4 Soil particle composition and fractal dimension under different bentonite treatments |
| 处理 | 黏粒 | 粉粒 | 砂粒 | 分型维数 | ||
|---|---|---|---|---|---|---|
| <2/μm | 2~50/μm | 50~100/μm | 100~250/μm | |||
| 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 | |
注:不同小写字母表示不同配比处理间差异显著(P<0.05)。 |
图3 不同配比膨润土处理下的抗剪强度注:CK为未经人为干扰的原生环境对照。下同。 Fig. 3 Shear strength of bentonite treated with different proportions |
此次野外实验得到乌鲁木齐市园林绿化工程质量监督站张勇娟老师和新疆西部领农航空植保科技有限公司王峰先生的技术和维护材料支持,在此表示衷心的感谢!
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