干旱区生态环境知识资源中心(Arid): Effects of loading rate on root pullout performance of two plants in the eastern Loess Plateau, China

Arid

DOI	10.1007/s40333-023-0026-3
	Effects of loading rate on root pullout performance of two plants in the eastern Loess Plateau, China
	Zhang, Chaobo; Li, Rong; Jiang, Jing; Yang, Qihong
通讯作者	Zhang, CB
来源期刊	JOURNAL OF ARID LAND
ISSN	1674-6767
EISSN	2194-7783
出版年	2023
卷号	15 期号:9 页码:1129-1142
英文摘要	Root pullout performance of plants is an important mechanical basis for soil reinforcement by plant roots in the semi-arid areas. Studies have shown that it is affected by plant factors (species, ages, root geometry, etc.) and soil factors (soil types, soil moisture, soil bulk densities, etc.). However, the effects of loading rates on root pullout performance are not well studied. To explore the mechanical interactions under different loading rates, we conducted pullout tests on Medicago sativa L. and Hippophae rhamnoides L. roots under five loading rates, i.e., 5, 50, 100, 150, and 200 mm/min. In addition, tensile tests were conducted on the roots in diameters of 0.5-2.0 mm to compare the relationship between root tensile properties and root pullout properties. Results showed that two root failure modes, slippage and breakage, were observed during root pullout tests. All M. sativa roots were pulled out, while 72.2% of H. rhamnoides roots were broken. The maximum fracture diameter and fracture root length of H. rhamnoides were 1.22 mm and 7.44 cm under 100 mm/min loading rate, respectively. Root displacement values were 4.63% (+/- 0.43%) and 8.91% (+/- 0.52%) of the total root length for M. sativa and H. rhamnoides, respectively. The values of maximum pullout force were 14.6 (+/- 0.7) and 17.7 (+/- 1.8) N under 100 mm/min for M. sativa and H. rhamnoides, respectively. Values of the maximum pullout strength for M. sativa and H. rhamnoides were 38.38 (+/- 5.48) MPa under 150 mm/min and 12.47 (+/- 1.43) MPa under 100 mm/min, respectively. Root-soil friction coefficient under 100 mm/min was significantly larger than those under other loading rates for both the two species. Values of the maximum root pullout energy for M. sativa and H. rhamnoides were 87.83 (+/-;21.55) mm center dot N under 100 mm/min and 173.53 (+/- 38.53) mm center dot N under 200 mm/min, respectively. Root pullout force was significantly related to root diameter (P<0.01). Peak root pullout force was significantly affected by loading rates when the effect of root diameter was included (P<0.01), and vice versa. Except for the failure mode and peak pullout force, other pullout parameters, including root pullout strength, root displacement, root-soil friction coefficient, and root pullout energy were not significantly affected by loading rates (P>0.05). Root pullout strength was greater than root tensile strength for the two species. The results suggested that there was no need to deliberately control loading rate in root pullout tests in the semi-arid soil, and root pullout force and pullout strength could be better parameters for root reinforcement model compared with root tensile strength as root pullout force and pullout strength could more realistically reflect the working state of roots in the semi-arid soil.
英文关键词	plant roots soil reinforcement loading rate root pullout properties root-soil interaction loess area
类型	Article
语种	英语
开放获取类型	Bronze
收录类别	SCI-E
WOS记录号	WOS:001087726900008
WOS关键词	TENSILE-STRENGTH ; TREE ROOTS ; MOISTURE-CONTENT ; REINFORCEMENT ; SYSTEMS ; SLOPES ; RESISTANCE ; ARCHITECTURE ; BEHAVIOR ; FORESTS
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/397191
推荐引用方式 GB/T 7714	Zhang, Chaobo,Li, Rong,Jiang, Jing,et al. Effects of loading rate on root pullout performance of two plants in the eastern Loess Plateau, China[J],2023,15(9):1129-1142.
APA	Zhang, Chaobo,Li, Rong,Jiang, Jing,&Yang, Qihong.(2023).Effects of loading rate on root pullout performance of two plants in the eastern Loess Plateau, China.JOURNAL OF ARID LAND,15(9),1129-1142.
MLA	Zhang, Chaobo,et al."Effects of loading rate on root pullout performance of two plants in the eastern Loess Plateau, China".JOURNAL OF ARID LAND 15.9(2023):1129-1142.