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Scientia Silvae Sinicae ›› 2023, Vol. 59 ›› Issue (10): 138-149.doi: 10.11707/j.1001-7488.LYKX20220146

• Research papers • Previous Articles     Next Articles

Effects of Planting Density of Hippophae rhamnoides and Inoculation of AMF on Understory Vegetation Growth and Soil Improvement

Xiao Wang1(),Yinli Bi1,2,*(),Yi Wang3,Ye Tian1,Qiang Li3,Xinpeng Du1,Yun Guo1   

  1. 1. State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources, China University of Mining and Technology (Beijing) Beijing 100083
    2. College of Geology and Environment, Xi’an University of Science and Technology Xi’an 710054
    3. CHN Energy Shenhua Shendong Coal Group Co., Ltd Shenmu 719300
  • Received:2022-03-17 Online:2023-10-25 Published:2023-11-01
  • Contact: Yinli Bi E-mail:dalianxiao222@163.com;ylbi88@126.com

Abstract:

Objective: To select an optimal way of the semi-arid coal mining restoration in China, we illustrated the effect of Hippophae rhamnoides planting density, arbuscular mycorrhizal fungi (AMF) inoculation and their interaction on the understory vegetation and soil properties. Method: A two-factor experimental design with three planting densities (L: 836 tree ? hm?2; M: 1 111 tree ? hm?2; H:1 667 tree ? hm?2), two inoculation treatments (AMF, CK) and the natural recovery area selected as the control was conducted in Daliuta mine in Shenmu county, Shanxi province, northwest China. The shrubs were planted in April 2012 and the AMF inoculation was conducted in July 2012 in small hole near shurbs. In October 2020, a vegetation survey and mixed sampling in 0-20 cm topsoil were carried out. All plots were totally 8 400 m2. The indices of understory vegetation and soil properties were selected for principal component analysis, and five principal components with characteristic values greater than 1 were selected to obtain the weight by the factor load matrix and calculate the comprehensive score. Result: 1) Improving planting density and AMF inoculation both improved the canopy coverage and existing density of Hippophae rhamnoides. 2) The planting density significantly increased the Pielou evenness of understory vegetation and decreased the Simpson dominance of understory vegetation, and the inoculation of AMF significantly increased the Pielou evenness index and decreased the Simpson dominance index of understory vegetation. Planting density significantly influenced the community composition, biomass and coverage of understory vegetation, and the biomass of understory vegetation was the largest at medium planting density. AMF inoculation significantly changed the community composition and biomass of understory vegetation. 3) The planting density and AMF inoculation significantly influenced the biomass of AMF and soil properties. The AMF biomass, microbial biomass and soil physical and chemical properties were at a high level under medium planting density. 4) There was significant interaction in planting density and mycorrhizal inoculation. The influence of planting density on understory vegetation and soil properties was less in inoculation treatments, compared to the control. 5) The comprehensive score results showed that the ecological restoration effect of medium planting density was the best in our study. Conclusion: In this experiment, the ecological restoration effect of medium planting density was the best in our study. Inoculation with AMF provided more ecological niches for planting, and relieved the limitation of high planting density on the growth and positive successions of understory vegetation.

Key words: planting density of Hippophae rhamnoides, arbuscular mycorrhizal fungi, understory plant community, topsoil properties, ecological restoration

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