Rheological Evaluation of Soil Mechanical Stability During Vegetation Restoration

WANG Xinyu; ZHOU Lin; MENG Jing; HU Shaojie; LV Yinyan; XU Chenyang; HU Feinan

doi:10.13870/j.cnki.stbcxb.2024.05.004

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Rheological Evaluation of Soil Mechanical Stability During Vegetation Restoration

更新时间：2025-02-18

- Rheological Evaluation of Soil Mechanical Stability During Vegetation Restoration
- Vol. 38, Issue 5, Pages: 175-183(2024)
- 作者机构：
  
  1. 中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西杨凌,712100
  2. 中国科学院大学,北京,100049
  3. 西北农林科技大学资源环境学院, 陕西杨凌 7121002
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2024.05.004
  CLC： S152
- Published：2024
- 稿件说明：
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WANG Xinyu, ZHOU Lin, MENG Jing, et al. Rheological Evaluation of Soil Mechanical Stability During Vegetation Restoration[J]. 2024, 38(5): 175-183.
DOI：

WANG Xinyu, ZHOU Lin, MENG Jing, et al. Rheological Evaluation of Soil Mechanical Stability During Vegetation Restoration[J]. 2024, 38(5): 175-183. DOI： 10.13870/j.cnki.stbcxb.2024.05.004.

摘要

[目的] 为探究黄土高原植被恢复过程中土壤微结构稳定性的演变规律。[方法] 选取子午岭林区4个不同植被演替阶段的土壤为研究对象

通过流变学方法振幅扫描测试方式测定不同基质势(0

-3

-10 kPa)下土壤抗剪切强度参数和黏弹性参数

并分析其与土壤理化性质之间的关系。[结果] (1)土壤抗剪切强度和黏弹性随植被演替阶段的增加而增加

主要是由于植被恢复过程中土壤有机碳、交换性Ca2+、砂粒质量分数增加和Na+下降提高土壤颗粒间的黏附力和摩擦力。(2)土壤抗剪切强度参数随基质势的降低而增加

在低基质势条件下

土壤抗剪切强度参数(G'LVE、τLVE和τmax)与交换性Ca2+、砂粒质量分数相关性不显著

而在高基质势条件下

土壤抗剪切强度参数与交换性Ca2+呈显著正相关(p<0.05)

τmax、G'LVE、τYP和G'YP均与砂粒质量分数呈显著正相关。(3)土壤黏弹性参数(γYP和IZ)随基质势的降低而降低;高基质势条件下土壤黏弹性参数与有机碳呈正相关

且随着基质势的降低

相关性逐渐减弱;不同基质势下黏弹性参数均与黏粒质量分数呈显著负相关。(4)土壤整体力学稳定性在0 kPa时与土壤Ca2+呈正相关

-3 kPa时与土壤粉粒、K+呈负相关

-10 kPa时与黏粒质量分数呈正相关关系。[结论] 研究结果揭示土壤在不同植被类型不同基质势下的力学稳定性变化规律及影响机制

为理解黄土高原植被恢复过程中土壤特性的演变提供重要依据

也为未来的土壤保护和生态恢复工作提供理论支撑。

Abstract

[Objective] This study is aiming to evaluate the dynamic evolution of soil microstructure stability during vegetation restoration on the Loess Plateau. [Methods] Soil samples from four stages of vegetation succession in the Ziwuling forest region were examined. Utilizing the amplitude sweep test method

soil shear strength and viscoelastic parameters were assessed under various matric potentials (0

-3 and -10 kPa). Correlation analyses between these parameters and soil physicochemical properties were conducted. [Results] (1) Soil shear strength and viscoelasticity exhibited an increasing trend with advancing vegetation succession stages

attributed primarily to the increasing of soil organic carbon

exchangeable Ca2+ and sand content

along with reduced Na+ during vegetation recovery. This augmentation contributed to enhanced interparticle adhesion and frictional forces. (2) The soil shear strength parameter increased with the decreasing of matric potential. Under low matric potential conditions

there was no significant correlation between soil shear strength parameters (G'LVE、τLVE and τmax) and exchangeable Ca2+ and sand content. Under high matric potential conditions

soil shear strength parameters showed a significant positive correlation with exchangeable Ca2+ (p<0.05)

while τmax

G'LVE

τYP

and G'YP exhibited significant positive correlations with sand content. (3) Soil viscoelastic parameters (γYP and Iz) showed a decreasing trend with declining matric potential. Particularly

under high matric potential conditions

these parameters exhibited a positive correlation with organic carbon content

which gradually attenuated with the decreasing of matrix potential. Viscoelastic parameters were negatively correlated with clay content under different matric potentials. (4) The overall mechanical stability of soil was positively correlated with soil Ca2+ at 0 kPa

negatively correlated with soil silt and K+ content at -3 kPa

and positively correlated with clay content at -10 kPa. [Conclusion] The changes and influencing mechanism of soil mechanical stability under different vegetation types and different matric potentials were revealed

which provided an important basis for understanding the evolution of soil characteristics in the process of vegetation restoration on the Loess Plateau

and also provided theoretical support for soil protection and ecological restoration in the future.

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Keywords

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