Mitigating soil salinity stress with titanium gypsum and biochar composite materials: Improvement effects and mechanism

被引:30
作者
Xu, Xin [1 ]
Wang, Jiahui [1 ]
Tang, Yiming [1 ]
Cui, Xuedan [1 ]
Hou, Daibing [1 ]
Jia, Hongjun [2 ]
Wang, Shaobo [2 ]
Guo, Lin [2 ]
Wang, Jinhang [1 ]
Lin, Aijun [1 ]
机构
[1] Beijing Univ Chem Technol, Coll Chem Engn, Beijing 100029, Peoples R China
[2] Shanxi Construct Engn Grp Co Ltd, Taiyuan 030000, Peoples R China
关键词
Titanium gypsum; Biochar; Ball mill; Saline-alkali land; Improvement mechanism; WATER; SALT; AVAILABILITY; COMMUNITIES; GROWTH; LAND;
D O I
10.1016/j.chemosphere.2023.138127
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Titanium gypsum and biochar are considered effective amendments for mitigating soil salinity stress. However, the knowledge is inadequate regarding their efficiency and application as an improvement. In this study, TG-B composite was prepared by using industrial by-products titanium gypsum and biochar as raw materials and then modified by ball milling method, to characterize its microscopic characteristics and explore the improvement effect on saline-alkali soil and plant growth. Besides, we explored the mechanism of TG-B in improving salinealkali soil and the dynamic balance of the solution reaction process. Our results showed that the CaSO4 center dot 2H(2)O particles in TG-B were finer, dispersed evenly, and contacted fully with soil gelatinous particles, which was more conducive to the improvement of saline-alkali soil. The results of TG-B with different ball milling ratios and different materials dosages indicated that the application rate of TG-B was 5%, and the optimum ratio of TG-B was TG: B (mass ratio) = 10:1, with the best soil improvement effect. The pot experiment proved that the indicators of indicating soil salinity such as pH, EC, SAR, and soluble Na+ decreased by 20.74%, 77.24%, 68.77%, and 44.70%, respectively, thus playing a good role in improving saline-alkali soil. In addition, pot experiments demonstrated that compared with the control group, the soil porosity and soil moisture content in the TG-B group increased by 15.95% and 38.71%, respectively, and further improve the structure and diversity of soil bacterial community when compared with titanium gypsum and biochar alone. Finally, the application of TG-B promoted the germination and growth of rice significantly through the synergistic effects of composite material components. These results all suggested that the application of TG-B was an effective strategy to improve soil salinity and promote plant growth. Therefore, it might provide new insights into the utilization of solid waste resources to improve saline-alkali lands.
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页数:12
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