期刊
JOURNAL OF SOILS AND SEDIMENTS
卷 17, 期 3, 页码 751-762出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11368-015-1326-9
关键词
Bioavailability; Biochar; Immobilization; Metal uptake; Soil contamination
资金
- Zhejiang Provincial Natural Science Foundation, China [LZ15D010001]
- National Natural Science Foundation of China [21577131, 41271337]
- Science and Technology Foundation of the Guizhou Province, China [[2013]2193]
- Scientific Research and Technology Development Foundation of Bijie Yancao Company of Guizhou Province, China [BJYC-201308]
- Special Funding for the Introduced Innovative R&D Team of Dongguan [2014607101003]
- Science and Technology Extension Program for Ecological Circular Agriculture of Ningbo Bureau of Agriculture [2015ST007]
Previous studies show that application of biochar can reduce the bioavailability of heavy metals in soil. A plant growth experiment was carried out to evaluate the effect of tobacco stalk- and dead pig-derived biochars on the extractability and redistribution of cadmium (Cd) and zinc (Zn) in contaminated soil, and the impact on tobacco (Nicotiana tabacum L.) plant growth. The top 20 cm of a soil contaminated with Cd and Zn was used in this study. Biochars derived from tobacco stalk and dead pig were applied to the soil at four application rates (0, 1, 2.5, and 5 %), and tobacco plants were grown. After 80-days growth, the pH, electrical conductivity (EC), CaCl2-extractable heavy metals and fractions of heavy metals in soil samples, as well as the plant biomass and the concentrations of heavy metals in the plant were determined. The plant growth experiment demonstrated that tobacco stalk biochar and dead pig biochar significantly (P < 0.05) increased the pH, but had no significant effect on the electrical conductivity (EC) of the soil. The CaCl2-extractable Cd and Zn content decreased as the application rates increased. The concentration of extractable Cd and Zn decreased by 64.2 and 94.9 %, respectively, for the tobacco stalk biochar treatment, and 45.8 and 61.8 %, respectively, for the dead pig biochar treatment at 5 % application rate. After biochar addition, the exchangeable Cd was mainly transformed to fractions bound to carbonates and Fe-Mn oxides, while the Zn was immobilized mainly in the fraction bound to Fe-Mn oxides. Tobacco stalk biochar increased the tobacco plant biomass by 30.3 and 36.2 % for shoot and root, respectively at the 5 % application rate. Dead pig biochar increased the tobacco plant biomass by 43.5 and 40.9 % for shoot and root, respectively, at the 2.5 % application rate. Both biochars significantly (P < 0.05) decreased the Cd and Zn accumulation by tobacco plant. As a soil amendment, tobacco stalk biochar was more effective at removing Cd, whereas dead pig biochar was more effective at removing Zn, and a higher application rate was more effective than a lower application rate. Overall, biochar derived from tobacco stalk was more effective, than dead pig biochar, at remediating soil contaminated with Cd and Zn, as well as promoting tobacco growth.
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