期刊
ENVIRONMENTAL POLLUTION
卷 218, 期 -, 页码 513-522出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2016.07.031
关键词
Soil contamination; Biochar; Heavy metal; Phytoavailability; Remediation; Alkaline soil
资金
- National Natural Science Foundation of China [41402305, 41401584, 41301561]
- Science and Technology Key Program of Shanxi Province [20140311008-6]
- Guangdong Academy of Sciences through the Outstanding Young Talents Support Plan [rcjj201302]
A pot experiment was conducted to investigate the effects of biochars on the availability of heavy metals (Cd, Cu, Mn, Ni, Pb, and Zn) to ryegrass in an alkaline contaminated soil. Biochars only slightly decreased or even increased the availability of heavy metals assesses by chemical extractant (a mixture of 0.05 mol ethylenediaminetetraacetic acid disodium, 0.01 mol L-1 CaCl2, and 0.1 mol L-1 triethanolamine). The significantly positive correlation between most chemical-extractable heavy metals and the ash content in biochars indicated the positive role of ash in this extraction. Biochars significantly reduced the plant uptake of heavy metals, excluding Mn. The absence of a positive correlation between the chemical-extractable heavy metals and the plant uptake counterparts (except for Mn) indicates that chemical extractability is probably not a reliable indicator to predict the phytoavailability of most heavy metals in alkaline soils treated with biochars. The obviously negative correlation between the plant uptake of heavy metals (except for Mn) and the (O + N)/C and H/C indicates that biochars with more polar groups, which were produced at lower temperatures, had higher efficiency for reducing the phytoavailability of heavy metals. The significantly negative correlations between the plant uptake of Mn and ryegrass biomass indicated the dilution effect caused by the improvement of biomass. These observations will be helpful for designing biochars as soil amendments to reduce the availability of heavy metals to plants in soils, especially in alkaline soils. (C) 2016 Published by Elsevier Ltd.
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