| Effects of applying modified biochar on growth and quality of cucumber in Hg\|contaminated soil |
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| DOI：10.7606/j.issn.1000-7601.2023.02.08 |
| Key Words: Hg\|contaminated soil modified biochar cucumber growth quality |
| Author Name | Affiliation | | BAI Junrui | College of Resources and Environmental Science, Northwest A&F University, Yangling, Shaanxi 712100, China | | LI Lu | No. 5 Exploration Institute of Geology and Mineral Resources, Tai’an, Shandong 271000, China | | ZHANG Haoyue | College of Resources and Environmental Science, Northwest A&F University, Yangling, Shaanxi 712100, China | | LV Zhiyuan | College of Resources and Environmental Science, Northwest A&F University, Yangling, Shaanxi 712100, China | | SUN Fangqiang | Arid and Semi\|arid Region Ground Water and Ecology Key Laboratory, Xi’an, Shaanxi 710054, China
Xi’an Center of China Geological Survey, Xi’an, Shaanxi 710054, China | | WANG Xiaojuan | Arid and Semi\|arid Region Ground Water and Ecology Key Laboratory, Xi’an, Shaanxi 710054, China
Xi’an Center of China Geological Survey, Xi’an, Shaanxi 710054, China | | ZHOU Lina | College of Resources and Environmental Science, Northwest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| This study used contaminated soil samples collected from the Xunyang Hg mining area in Shaanxi Province to examine the effects of modified biochar on plant growth and quality in the Hg mining areas. Cucumber potted planting experiments were carried out using different amount of modified biocarbon additions. Four treatments were set: 0 g·1.5kg-1 (CK), 10 g·1.5kg-1 (T10), 30 g·1.5kg-1 (T30) and 50 g·1.5kg-1 (T50) respectively. The growth, physiological indicators and Hg and trace element concentration of each organ were determined. The experimental results showed that the dry mass of cucumber roots treated with T10 increased by 100% compared with CK, but there was no significant effect on stems and leaves. The dry mass of cucumber organs in T30 and T50 treatments decreased significantly. The Hg concentration of cucumber fruits treated with T10, T30 and T50 decreased by 70%, 62% and 65% respectively compared with CK. T30 and T50 treatments increased ascorbic acid and nitrate contents in cucumber fruits, leading to a decrease of 59.8% and 66.7% in leaf POD activity, and a decrease of 16.2% and 16.1% in CAT activity. T10 treatment had the best performance in several aspects such as Hg curing effect, cucumber nutritional quality and biomass, and had less impact on growth and development of soil and environmental cucumber itself. The findings suggest that low concentration of modified biochar can be used for ecological restoration and crop nutrition regulation in the Hg\|contaminated areas. |
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