寒旱环境黄土区灌木植物根系拉拔试验及其根系表面微观结构特征研究

doi:10.13722/j.cnki.jrme.2016.1154

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Abstract

To systemically research into pull-out resistance properties of roots and the effect of root-soil interface microstructure feature on the interface friction strength between root and soil particles，the shrubs Caragana korshinskii Kom. and Zygophyllum xanthoxylon Maxim. with a growth period of two years being planted in a self-established testing area were selected as the research objects and indoor pull-out test was carried out to them. Then scanning electron microscope(SEM) was applied to further investigate surface microstructure features of root and their effect on the friction strength between root and soil. The test results are the following：The mean values for maximum pull-out resistance of C. korshinskii roots and Z. xanthoxylon roots are 78.89±24.47 and 67.78±32.82 N，so the mean value of maximum pull-out resistance of C. korshinskii roots is greater than that for Z. xanthoxylon roots；the mean values for displacement of C. korshinskii roots and Z. xanthoxylon roots at maximum pull-out resistance are 4.02±1.84 and 10.67±4.04 mm，so the mean value for displacement of Z. xanthoxylon roots is greater than that of C. korshinskii roots；both integrated pull-out pattern and fractured pull-out pattern appeared in the process of roots pull-out for C. korshinskii，meanwhile fractured pull-out pattern and periderm slip pattern appeared for Z. xanthoxylon roots；the maximum pull-out resistance of C. korshinskii roots and Z. xanthoxylon roots tends to increase with roots surface area，roots volume，total roots length，roots dry weight and lateral root number increasing，among these five root morphology indexes，roots surface area has relatively more significant influence on roots maximum pull-out resistance；along axial direction of C. korshinskii root，grooves and ridges densely distributed in the surface of root with more net-like structures，so root surface microstructure for C. korshinskii is more complex than that for Z. xanthoxylon, and interface friction strength between soil and root for C. korshinskii is greater than that for Z. xanthoxylon. The slope protection ability of C. korshinskii is greater than that for Z. xanthoxylon. The research conclusion is useful to further investigate mechanics mechanism of interaction between roots and soil for shrubs in cold and arid environment，and meanwhile this conclusion has a theoretical significance and practical value in preventing soil erosion，shallow landslide and other geological hazards in the testing area.

Key words： soil mechanics cold and arid environment loess area pull-out test root morphology index roots pull-out pattern root surface microstructure

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	Articles by authors
	LIU Yabin1
	2
	YU Dongmei1
	QI Zhaoxin1
	2
	HU Xiasong1
	3
	FU Jiangtao1
	2
	LI Shuxia1
	2
	ZHU Haili1
	2

Cite this article:

LIU Yabin1,2,YU Dongmei1, et al. Research on pull-out test and surface microstructure features of shrubs roots in loess area of cold and arid environment[J]. , 2018, 37(S1): 3701-3713.

URL:

https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2016.1154 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/IS1/3701

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