干旱区研究

Arid Zone Research ›› 2018, Vol. 35 ›› Issue (6): 1459-1467.doi: 10.13866/j.azr.2018.06.24

• Ecology and Environment • Previous Articles     Next Articles

Effects of Self-healing of Caragana microphylla on Root Soil Reinforcement in Arid Diggings

WANG Bo1, LIU Jing1, WANG Chen-jia1, ZHANG Xin2, LI Qiang3, LIU Jia-wei1, ZHANG Qiang1   

  1. 1. College of Desert Control Science and Engineering, Inner Mongolia Agricultural University, Hohhot 010019, Inner Mongolia, China;
    2. Institute of Water Resources for Pasturing Area, Ministry of Water Resources, Hohhot 010019, Inner Mongolia,China;
    3. Environmental Management Office, Shendong Coal Group, Ejin Horo Banner 017200, Inner Mongolia, China
  • Received:2018-04-13 Revised:2018-05-17 Online:2018-11-15 Published:2025-11-18

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Abstract: In this study, the HG100 digital push & pull tester and self-developed experimental installation were used to investigate the anti-fracture mechanical properties of tap roots (diameter was 1-4 mm) and lateral roots of Caragana microphylla before and after occurring the fracture force injury. The purposes of the study were to clarify the effects of fracture force injury on mechanical properties and self-healing mechanism of plant roots after soil erosion occurred in the Shendong diggings. The results indicated that: ① There was a positive power function correlation between the root ultimate anti-fracture force and root diameter of C.microphylla in early growth season, but a negative one between the anti-fracture strength and root diameter. Moreover, the ultimate anti-fracture force and strength of tap roots were higher than that of lateral roots. ② The fracture force injury restricted significantly the normal growth of roots, and the activity, growth and survival rate of C.microphylla roots after self-healing were all lower than those of contrast. Root diameter and root type were the important factors affecting evidently such restriction, the activity and survival rate of lateral roots were decreased more significantly than those of tap roots after injured; ③ The ultimate anti-fracture force and strength of C.microphylla roots were increased to some extent after self-healing compared with those in early growth season, but such increase was restricted by the external injury, and the growth rate was significantly lower than that of control. The self-healing rates of ultimate anti-fracture force and strength after three months were 48.91% and 57.59% respectively. In conclusion, the root system could not completely lose its soil reinforcement capability after injured, the original function could be restored gradually through self-healing capability. The self-healing rates of tap roots and lateral roots were 60.55% and 36.34% respectively, which showed that the self-healing capability of tap roots was obviously higher than that of lateral roots.

Key words: coal mining subsidence land, anti-fracture feature, Caragana microphylla, root injured, self-healing