Abstract：[Background] Ecological environment in the karst area is very fragile and the soil erosion is serious.Plant roots play an important role in controlling shallow landslides, consolidating soils, and preventing soil erosion.Root architecture is one of the important factors affecting the function of soil fixation. Therefore, studying the unique root architecture of shrubs in this area is of great significance for evaluating the soil and water conservation effects of plant roots.[Methods] In this study,the whole plant root system was excavated by stepwise mining, and the diameter, height, crown width, root diameter, root length and root angle were measured. The topological index, root connection length and root branching rate of three shrub roots in Karst area of central Guizhou were analyzed, and the horizontal distribution characteristics and root bending characteristics of roots were discussed.[Results] 1)The three shrubs adopt similar adaptive strategies to the limited living space of karst, and the topological index TI is close to 1, that is, they all tend to the herringbone structure. 2)The total root connection length of the three shrubs was longer,which was characterized by Cassia bicapsularis (597.17 cm) > Indigofera amblyantha (589.23 cm) > Pyracantha fortuneana (567.53 cm),but the difference between the species was not significant (P>0.05). In addition there was no significant difference between the root connection lengths of the tertiary and fourth roots (P>0.05), and there was a extremely significant difference between the root lengths of the other levels (P<0.01). 3)The total root branching rate of Pyracantha fortuneana (2.314) > Indigofera amblyantha (1.747) > Cassia bicapsularis (1.541), that is, the root branching ability of Pyracantha spinosa was the strongest. 4)The root systems of three shrubs distribute unevenly in horizontal direction, and there is uncertainty. In addition, shrub roots also exhibit a unique entangled and curved shape in the search for growth space.[Conclusions] In order to adapt to the karst fragile habitat, the shrub root system adopts the development of the herringbone structure, increases the length of root connection, reduces the branching rate of the root system, and grows in a curved winding manner, and the root system is unevenly distributed horizontally and is explored by the external habitat and the root itself. The common impact of the mechanism.
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2019, Vol. 17 
