Study on the Shear Characteristics of Quinoa Root-Soil Complex in Wuchuan Area at the Northern Foot of Yinshan Mountain
In this paper,G28,WD9,WD12 and W7 high-yielding quinoa were selected as research objects in Wu-chuan area at the northern foothills of the Yinshan Mountains,and the shear strength characteristics of quinoa root system in different diameter levels and different soil water contents were investigated through the straight shear test of vegetative soils and quinoa root-soil composite.The results showed that the shear strength of quinoa root-soil composite had a significant positive correlation with the root size,i.e..With the increase of root size,its shear strength also increased significantly.Meanwhile,the larger root diameter class not only enhanced the shear strength of the composite,but also promoted the increase of cohesion and internal friction angle.The results of the straight shear test showed that under 6.25kPa and 12.5kPa vertical loads(quinoa root concentration area),the growth rate of cohesion of quinoa root-soil composite was higher than 27％,with the highest value reaching 32％,compared to the growth rate of internal friction angle,which was more stable,with an average of about 4％.After planting quinoa,its root system significantly enhanced the shear strength of the soil,in which cohesion played a dominant role.In addition,the shear strength and cohesion of the quinoa root-soil complex showed an increasing trend with the increase of soil water content,and both reached the maximum value when the soil water content reached 11.54％.However,the angle of internal friction decreased with increasing water content.The growth rates of quinoa root-soil composite shear strength and cohesion at 6.25 kPa and 12.5 kPa vertical load(quinoa root con-centration area)under natural conditions relative to the vegetative soil yielded that the variety with the best ability to hold water and soil was G28.
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