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[1]Lei Lei,Wang Liang,Fan Chenghu,et al.Microbial solidification reinforcement and vegetation restoration of loess slope[J].Research of Soil and Water Conservation,2025,32(01):227-234,242.[doi:10.13869/j.cnki.rswc.2025.01.001]

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Microbial solidification reinforcement and vegetation restoration of loess slope

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 32 Number of periods: 2025 01 Page number: 227-234,242 Column: Public date: 2025-01-10

Title:: Microbial solidification reinforcement and vegetation restoration of loess slope

Author(s):: Lei Lei^1,2, Wang Liang^1,2, Fan Chenghu³, Liu Zirui³, Song Yang⁴, Xue Qiannan⁵, Tian Kanliang^6,7, Duan Jingui^6,8; (1.Electric Power Research Institute,State Grid Shaanxi Electric Power Co.,Ltd.,Xi'an 710100,China; 2.State Grid(Xi'an)Environmental Protection Technology Center Co.,Ltd.,Xi'an 710100,China; 3.State Grid Shaanxi Electric Power Co.,Ltd.,Xi'an 710100,China; 4.Ankang hydroelectric power company,State Grid Shaanxi Electric Power Co.,Ltd.,Ankang,Shaanxi 725009,China; 5.Xi'an Power Supply Company,State Grid Shaanxi Electric Power Co.,Ltd.,Xi'an 710100,China; 6.Institute of Soil and Water...)

Keywords:: loess slope; microbial mineralization; strengthening technique; vegetation restoration; slope protection

CLC:: S157.2

DOI:: 10.13869/j.cnki.rswc.2025.01.001

Abstract:: [Objective]The aims of this study are to examine the reinforcement of loess slope by microbial solidification and vegetation restoration, and to provide new methods and technologies for the reinforcement of loess slope and the prevention and control of slope soil erosion. [Methods]The Microbially Induced Calcite Precipitation(MICP)technology was used to strengthen the solidification of loess slope, and vegetation restoration was carried out on the solidified loess slope. The mechanism of MICP technology on solidification reinforcement of loess slope was investigated from the microscopic point of view by using scanning electron microscopy and optical microscopy. The vegetation restoration effect of solidified loess slope was statistically analyzed. [Results]After solidifying the loess slope with MICP technology, the solidified layer formed on the slope cemented the loose and adjacent soil particles together to form a whole loess slope. The maximum thickness of the solidified layer was 0.23 cm. The average thickness was 0.21 cm. On the 60 days after vegetation restoration, the survival rate of vegetation in A1, A2, B1, B2, A1B1 and A2B2 was significantly(p<0.05)increased by 26.66%, 20%, 37.5%, 25%, 33.33% and 25%, respectively, compared with A0, B0 and A0B0. After the 60 days, the survival rate of vegetation in each region was significantly different and the survival rate of vegetation in A1, B1 and A1B1 regions with water-retaining agent after solidification was the highest. The growth changes in height and ground diameter of Amorpha fruticosa in the B1 and A1B1 regions with addition of water retaining agents after solidification were the largest. The growth of Amorpha fruticosa and Ophiopogon in each area of A1, B1 and A1B1 after solidification with water-retaining agent was the best. [Conclusions]MICP technology can effectively solidified loess slope, and combined with vegetation restoration technology, it can not only prevent soil erosion, but also restore the ecological environment. This comprehensive control measures provide good technical support for soil erosion comtrol and ecological restoration of loess slope.

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Last Update: 2025-01-10