How Does Embedding Angle Affect Root–Soil Mechanical Interactions?

Chaobo Zhang (), Xiaohui Feng, Geng Qu, Qihong Yang and Jing Jiang
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Chaobo Zhang: College of Water Resources Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Xiaohui Feng: College of Water Resources Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Geng Qu: Key Laboratory of the Regulation and Flood Control of Middle and Lower Reaches of the Changjiang River under Ministry of Water Resources, Changjiang River Scientific Research Institute, Wuhan 430010, China
Qihong Yang: Key Laboratory of the Regulation and Flood Control of Middle and Lower Reaches of the Changjiang River under Ministry of Water Resources, Changjiang River Scientific Research Institute, Wuhan 430010, China
Jing Jiang: College of Water Resources Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Sustainability, 2023, vol. 15, issue 4, 1-15

Abstract: Root–soil mechanical interactions are of vital importance in soil reinforcement by plant roots. However, it is unclear how the angles of the roots in the soil affect the root–soil mechanical interactions. To better understand the effect of this factor on root–soil mechanical interactions, pullout tests were conducted on alfalfa ( Medicago sativa L.) roots with five root diameter groups (0.10–0.30 mm, 0.31–0.50 mm, 0.51–0.70 mm, 0.71–0.90 mm and 0.91–1.10 mm) and four embedding angles (30°, 45°, 60° and 90°) in sandy loam soil. Root tensile tests were also carried out to understand the process of root failure in the pullout tests. The results showed that the roots had two failure modes, slippage failure and breakage failure. The critical diameter of the two failure modes was 0.35 mm. Peak pullout force and pullout energy were positively related to the root diameter in power functions. Displacement was negatively related to the root diameter and embedding angle in exponential functions. Peak pullout force, root–soil friction coefficient and pullout energy all increased and then decreased with increasing embedding angles. The peak pullout force and root–soil friction coefficient reached their maximum values under an embedding angle of 60°, and pullout energy reached the maximum value under an embedding angle of 45°. Pullout energy was suggested as a preferred index of root–soil mechanical interactions for both thick/fine roots and inclined/upright roots.

Keywords: root–soil interaction; embedding angle; peak pullout force; root–soil friction coefficient; pullout energy (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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