Drying of fibrous roots strengthens the negative power relation between biomechanical properties and diameter
Drying of fibrous roots strengthens the negative power relation between biomechanical properties and diameter
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DOI：
10.1007/s11104-021-05150-1
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发表时间：
2021-10
期刊：
影响因子：
4.9
通讯作者：
E. Ekeoma;D. Boldrin;K. Loades;A. Bengough
中科院分区：
文献类型：
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作者：
E. Ekeoma;D. Boldrin;K. Loades;A. Bengough
目的研究根系干燥对须根生物力学特性的影响。方法测定高羊茅（Festuca arundinaceae）根系完全水化后和逐步干燥过程中的抗拉强度和杨氏模量。根直径，水分流失，和含水量进行了测定，为所有treatment.ResultsHydrated根表现出弱的生物力学性质和直径之间的关系。干燥30 min后，细根（< 1 mm）的抗拉强度和杨氏模量均显著增加，干燥60 min后，抗拉强度和杨氏模量均与根径呈负幂关系。干燥60分钟后记录的最大强度和杨氏模量值分别为三倍和四倍大于水合根。当含水量低于0.70 g g−1时，强度和杨氏模量迅速增加。这些生物力学变化是由于干燥60分钟后根直径收缩高达50%，水分损失高达0.7 g g− 1。我们建议控制根水分和测试完全水合的根作为标准协议，考虑到边坡不稳定通常是由暴雨事件和基质吸力损失引起的。
AimsTest the effects of root drying on biomechanical properties of fibrous roots.MethodsTensile strength and Young’s modulus ofFestuca arundinacearoots were tested after full hydration and during progressive drying. Root diameter, water loss, and water content were measured for all treatments.ResultsHydrated roots showed weak relations between biomechanical properties and diameter. After only 30 min air-drying, both tensile strength and Young’s modulus increased significantly in thin roots (< 1 mm) and after 60 min drying, both strength and Young’s modulus showed a negative power relation with root diameter. The maximum strength and Young’s modulus values recorded after 60 min drying were respectively three- and four-times greater than in hydrated roots. Strength and Young’s modulus increased rapidly when water content dropped below 0.70 g g−1. These biomechanical changes were the result of root diameter shrinkage of up to 50% after 60 min drying, driven by water loss of up to 0.7 g g−1.ConclusionsStrength and Young’s modulus largely increased with root drying. We suggest controlling root moisture and testing fully hydrated roots as standard protocol, given that slope instability is generally caused by heavy rainfall events and loss of matric suction.