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| Effects of improved material mixed application on selenium availability in selenium-rich soil |
| Received:May 03, 2025 |
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| KeyWord:selenium-rich soil;available selenium;soil amendments;orthogonal test;range analysis |
| Author Name | Affiliation | E-mail | | ZHANG Ying | School of Chemical and Environmental Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China | | | LI Xiaohua | Comprehensive Prospecting Team, North China Geological Exploration Bureau, Sanhe 065201, China | 115775909@qq.com | | LIU Hongchao | Comprehensive Prospecting Team, North China Geological Exploration Bureau, Sanhe 065201, China | | | ZHANG Yaxuan | Center for Ecological Civilization Research, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | | LI Zhaoyang | Comprehensive Prospecting Team, North China Geological Exploration Bureau, Sanhe 065201, China | | | HUANG Zhanbin | School of Chemical and Environmental Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China | zbhuang2003@163.com |
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| Abstract: |
| In order to deal with the low utilization rate of selenium in selenium-rich soil and crops failing to meet selenium-rich standards, this study was used simulated soil pot culture experiments, and investigated the optimal combination of four soil amendments to improve the selenium utilization efficiency in selenium-rich areas. Taking the surface soil from selenium-rich area in Dongerying Town in Jizhou District, Tianjin, as an example, four amendments, limestone（A）, calcium magnesium phosphate fertilizer（B）, composite humic acid（C）, and fermented organic matter（D） were applied. A three-level orthogonal experimental design with four factors was used to analyze and determine the optimal combination of materials for enhancing soil selenium utilization efficiency. The results showed that the application of composite amendments improved the soil′s physical and chemical properties. Among these, the pH exhibited no significant change, remaining within the range of 6.8-8.2, while the soil bulk density decreased. The field water-holding capacity, organic matter content, electrical conductivity（EC）, and cation exchange capacity（CEC） increased. The content of available selenium in the soil also rose, with a stable increase observed over a 60-day incubation period and the most significant improvement was 38.4% high than that of no amendment material treatment（CK）. Through range analysis, the optimal combination for enhancing selenium utilization efficiency was determined to be A3B3C2D1（the ratio of high-calcium stone∶calcium-magnesium-phosphate fertilizer∶compound humic acid∶fermented organic matter is 1.8∶6∶6∶5） in the 60-day incubation results. |
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