期刊
PLANT AND SOIL
卷 431, 期 1-2, 页码 347-369出版社
SPRINGER
DOI: 10.1007/s11104-018-3766-7
关键词
Eco-engineering; Root dehydration; Root shrinkage; Root water potential; Tensile strength; Young's modulus
资金
- EPSRC [EP/N03287X/1]
- EU FP7 Marie Curie Career Integration Grant (CIG) under the project BioEPIC slope
- Scottish Government
- Engineering and Physical Sciences Research Council [EP/N03287X/1] Funding Source: researchfish
- EPSRC [EP/N03287X/1, EP/R005834/1] Funding Source: UKRI
Effects of root water status on root tensile strength and Young's modulus were studied in relation to root reinforcement of slopes. Biomechanical properties of woody roots, Ulex europaeus, were tested during progressive dehydration and after thirty-day moisture equilibration in soil with contrasting water contents. Root diameter, water content and water loss were recorded and root water potential versus water content relation was investigated. Tensile stresses induced by root contraction upon dehydration were measured. Root tensile strength and Young's modulus increased abruptly when root water content dropped below 0.5 g g(-1). The strength increase was due to root radial and axial contraction induced by root water potential drop. Diameter decrease and strength gain were the largest for thin roots because of the relatively larger evaporative surface per volume of thin roots. Largely negative water potentials in dry soil induced root drying, affecting root biomechanical properties. Root water status is a factor that can cause (inappropriately) high strength values and the large variability reported in literature for thin roots. Therefore, all root diameter classes should have consistent moisture for fair comparison. Testing fully hydrated roots should be the routine protocol, given that slope instability occurs after heavy rainfall.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据