Full
Outline
Objective 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 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 （Ksat） 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 （CRi）， which is a key indicator of the dynamic process. Results 1） Non-capillary porosity （NCP）， macropore area ratio （PAR）， and root surface area density （RSAD） were the main influencing factors of Ksat， with the coefficient of determination （R²） between PAR and Ksat 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 The saturated hydraulic conductivity （Ksat） 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 （Ksat） 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.
193
87
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62662699(Operation and Technical Support)
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
