Effects of Heavy Metals (Cd, Pb, Cu, Zn, and Ni) on Ipomoea aquatica Forsk. Growth in Soil Containing Metal-biochar Application
Ru Zhang 1,2
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Guangdong Provincial Key Laboratory of Eco-Circular Agriculture, Guangzhou 510642, China
College of Natural Resources and Environment, South China Agricultural University, Guangzhou, P.R. China
Life Science and Technology School, Lingnan Normal University, Zhanjiang, P.R. China
Submission date: 2019-04-05
Final revision date: 2019-07-28
Acceptance date: 2019-09-01
Online publication date: 2020-04-07
Publication date: 2020-04-21
Corresponding author
Guikui Chen   

South China Agricultural University, 483 Wushan Road, College of Agriculture, South Chi, 510642, Guangzhou, China
Pol. J. Environ. Stud. 2020;29(4):2513–2524
The combined heavy metal pollution in vegetable fields poses a threat to food security. In this study, three types of biochar – Wedelia trilobata (WB), Pennisetum sinese Roxb (PB), and coffee grounds (CB) – were applied to a heavy metal-contaminated soil at rates of 2% and 5% (w/w). A pot experiment was conducted to investigate the effects of these three different types of biochar on the growth two Ipomoea aquatica Forsk. cultivars in the soil, and related mechanisms. The results showed that the addition of the three types of biochar significantly increased soil pH and SOM content. WB and PB significantly increased the shoot biomass of I. aquatica Forsk. The 5% WB amendment significantly decreased the plant uptake of Cd, Pb, Zn, and Ni. But PB and CB amendments at 2% or 5% showed no consistent effects on plant uptake of Cd, Pb, Cu, Zn, and Ni. The multi-factor variance analysis showed that biochar type significantly influenced Cd, Pb, Cu, Zn, and Ni accumulation in plant shoot and root and Cd, Cu, and Zn concentration in rhizosphere. Interestingly, in some of the treatments with PB and CB amendments, total available heavy metals increased, indicating that heavy metals contained in the biochar might have been released into the soil. The results indicated that biochar feedstock should be ecologically friendly.