Tongyu Li1, Chunying Li2, Binxia Xue This email address is being protected from spambots. You need JavaScript enabled to view it.1, Li Wei 3, Tong Zhang1, and Qingqing Feng4
1School of Architecture, Harbin Institute of Technology / Key Laboratory on Urban-Rural Human Settlement Environment in Winter City of Ministry of Science and Technology Industry and Information, Harbin, China. 150006 2School of Energy and Civil Engineering, Harbin University of Commerce, Harbin, China. 150028 3State Key Laboratory of Urban Water Resource and Environment, Harbin, China .150090 4Northeast Forestry University, Department of Landscape Architecture, Harbin, China. 100083
Received: September 2, 2020 Accepted: November 17, 2020 Publication Date: June 1, 2021
Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.
In Daqing, years of oil exploration have led to severe oil pollution, aggravating salinization particularly. In this study, the concept of terraced landscape design combined with T. ambiguum Bieb. and microbial inoculums is proposed as a restoration technology for saline and alkali land, with the aim of removing oily substances and recovering soil fertility. The technology of 454 high-throughput sequencing was deployed to analyze the microbial community of the inoculums and the salinity and alkalinity changes of terraced land. The removal rate using T. ambiguum Bieb. and microbial inoculums was 94.7 % after seventy days. The dominant phyla for the saline and alkali soil after the treatment were Firmicutes (61.74 % of total bacteria) and Proteobacteria (35.91 %), At a general level, the relative abundances were Lactobacillus (6.22 %), Lysinibacillus (13.61 %), Clostridium (12.98 %), Clostridium XI (18.39 %), Lachnospiraceae (16.74 %) and Enterobacteriaceae (15.30 %). Microbes were reinforced biologically in advantageous clusters in microbial inoculums. In a landscape design for terraces that used the principle of gravity sedimentation, the pH approached 7, alkalinity was reduced by 50 % on average, and salinity was decreased by 75 % at the upper level, indicating a considerable decrease in salinity and alkalinity. The landscape measure of a trapezoidal terrace using natural sedimentation combined with plant-microbial inoculums offers a treatment technology and pattern for the protection and development of saline and alkali land in oil exploration areas.
Keywords: Saline-alkali land; T. ambiguum Bieb. and microbial inoculums; Combined restoration; Terraced landscape; Daqing
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