ORIGINAL RESEARCH
Spatial Variability of Reinforcement Provided by Juvenile Root Systems of Black Locust and Black Poplar
Andrzej Gruchot 1  
,  
Marcin Kluba 2  
 
 
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1
Department of Hydraulic Engineering and Geotechnics, Faculty of Environmental Engineering and Land Surveying, University of Agriculture in Kraków, Kraków, Poland
2
Graduate of the University of Agriculture in Krakow, Faculty of Environmental Engineering and Land Surveying, Poland
CORRESPONDING AUTHOR
Tymoteusz Adam Zydroń   

Department of Hydraulic Engineering and Geotechnics, Faculty of Environmental Engineering and Land Surveying, University of Agriculture in Kraków, 30-059 Kraków, Poland, al. Mickiewicza 24/28, p. 511a, 30-059 Kraków, Poland
Online publish date: 2019-05-31
Publish date: 2019-07-08
Submission date: 2018-04-24
Final revision date: 2018-09-13
Acceptance date: 2018-09-24
 
Pol. J. Environ. Stud. 2019;28(5):4027–4037
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ABSTRACT
Our work aimed to determine the spatial distribution of the root cohesion of the roots of 8-year-old black locust and black poplar trees. The scope of our research and analyses included determining characteristics of root systems of the studied tree species by profiling the walls of a trench with a width and a depth of 1.0 m at a distance of 0.5 and 1.0 m from the trunks. Laboratory tests comprised determining the tensile strength of the selected root classes. A modified Schwarz model (RDM) was used to describe the horizontal distribution of roots in the soil. The increase in shear strength of the root-reinforced soil was determined by a strain bundle model in which the value of the force mobilized by the roots is described by the Weibull survival function (RBMw). The results of the root system measurements have shown that the black locust is characterized by a greater number of roots, while the roots of black poplar are thicker, which makes the relative surface of its roots larger. Calculations of root cohesion using the modified bundle model, taking into account the root system displacement, showed that the maximum value for the black locust was 9.4 and 6.4 kPa, and for the black poplar 6.4 and 6.2 kPa respectively at a distance of 0.5 and 1.0 m from the trunk. It was also shown that the optimal spacing of the trees of these species, necessary to achieve effective reinforcement of the soil, was approximately 4 m.
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ISSN:1230-1485