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1.北京林业大学水土保持学院, 北京 100083
2.中国水电基础局有限公司, 天津 301700
3.中国科学院地理科学与资源研究所, 北京 100101
4.盐城市水利勘测设计研究院;有限公司, 江苏 盐城 224000
5.通用技术集团工程设计有限公司, 济南 250031
Received:16 December 2025,
Revised:2026-02-18,
Accepted:15 March 2026,
Online First:20 April 2026,
Published:28 August 2026
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张昊,马超,陈雨欣,等.黄土区根土复合体饱和渗透性及穿透曲线突变值的影响因素[J].水土保持学报,2026,40(4):128-140.
Zhang Hao, Ma Chao, Chen Yuxin, et al. The influencing factors of saturated permeability and breakthrough curve abrupt change values in root-soil composites from loess region[J]. Journal of Soil and Water Conservation, 2026, 40(4):128-140.
张昊,马超,陈雨欣,等.黄土区根土复合体饱和渗透性及穿透曲线突变值的影响因素[J].水土保持学报,2026,40(4):128-140. DOI: 10.13870/j.cnki.stbcxb.2026.04.010. CSTR: 32310.14.stbcxb.2026.04.010.
Zhang Hao, Ma Chao, Chen Yuxin, et al. The influencing factors of saturated permeability and breakthrough curve abrupt change values in root-soil composites from loess region[J]. Journal of Soil and Water Conservation, 2026, 40(4):128-140. DOI: 10.13870/j.cnki.stbcxb.2026.04.010. CSTR: 32310.14.stbcxb.2026.04.010.
目的
2
为探究黄土高原地区典型滑坡重灾区根土复合体水分运移机制对边坡稳定性的影响。
方法
2
针对该区域根系层土体水分穿透曲线变化过程开展系统分析,通过测定土壤物理性质、大孔隙结构参数和根系参数,结合线性相关分析识别饱和导水率(
K
sat
)的关键影响因子,并运用冗余分析(RDA)与方差分解分析(VPA),量化各影响因素对动态过程指标出流速率变化率(CR
i
)的贡献程度。
结果
2
1)非毛管孔隙度(NCP)、大孔隙面积比(PAR)和根表面积密度(RSAD)是影响
K
sat
的主要因子,其中PAR与
K
sat
的决定系数(
R²
)最高可达0.99。2)土体级配和大孔隙参数整体上对出流速率变化率(CR
i
)有显著影响(
F
=2.67),基
于冗余分析共解释其78.05%的约束变异。3)级配参数通过调控大孔隙结构来影响水流路径变化机制,基于方差分解分析,级配参数解释其34.8%的变异。
结论
2
黄土高原根土复合体饱和导水率受土壤基本物理性质、大孔隙参数、根系参数的共同影响,其主要由非毛管孔隙及0.8~4.0 mm大孔隙主导,与土壤体积质量呈负相关;根系通过促进孔隙发育改善渗透性能;而颗粒级配在不同植被类型土壤中,对饱和导水率(
K
sat
)的影响则呈明显差异;对于出流速率变化率,砂粒、粉粒与黏粒的比例是最主要的影响因子,研究结果为进一步理解黄土区根土复合体水分运移机制及边坡稳定性评估提供理论依据。
Objective
2
This study aims to investigate the water transport mechanisms in the root-soil composites of typical landslide-prone areas on the Loess Plateau and its influence on slope stability.
Methods
2
A systematic analysis was performed on the variation process of the soil water breakthrough curve within the root zone of the region. By measuring soil physical properties, macropore structural parameters, and root parameters indicators, the key influencing factors of saturated hydraulic conductivity (
K
sat
) were identified in combination with linear correlation analysis. Furthermore, redundancy analysis (RDA) and variance partitioning analysis (VPA) were applied to quantify the contribution of each influencing factor to the change ratio of outflow velocity (CR
i
), which is a key indicator of the dynamic process.
Results
2
1) Non-capillary porosity (NCP), macropore area ratio (PAR), and root surface area density (RSAD) were the main influencing factors of
K
sat
, with the coefficient of determination (
R
²) between PAR and
K
sat
reaching up to 0.99. 2) Soil gradation and macropore parameters overall had a significant effect on the change ratio of outflow velocity (CR
i
) (
F
=2.67), explaining 78.05% of the constrained variation based on redundancy analysis. 3) Gradation influenced the variation mechanisms of water flow paths by regulating macropore structure, explaining 34.8% of the
variation based on variance partitioning analysis.
Conclusion
2
The saturated hydraulic conductivity (
K
sat
) of root-soil composites on the Loess Plateau is jointly influenced by basic soil physical properties, macropore parameters, and root parameters. It is primarily dominated by non-capillary porosity and macropores ranging from 0.8 mm to 4.0 mm, and is negatively correlated with soil bulk density. Roots improve permeability by promoting pore development. Furthermore, the influence of particle size distribution on saturated hydraulic conductivity (
K
sat
) exhibits significant variations among soils under different vegetation types. Regarding the change ratio of outflow velocity, the proportions of sand, silt, and clay are the most dominant influencing factors. This study provides a theoretical basis for further understanding the water transport mechanisms in root-soil composites of loess regions and for evaluating slope stability.
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