title: Effects of biochar and Arbuscular mycorrhizae on bioavailability of potentially toxic elements in an aged contaminated soil.
abstract: Biochar pyrolyzed from corn stalks at 300°C/500°C and arbuscular mycorrhizae (AMF) were examined independently and in combination as possible treatments for soil remediation contaminated with Cd, Cr, Ni, Cu, Pb, Zn after 35 years following land application of sewage sludge in the 1970s. The results showed that biochar significantly decreased the heavy metal concentrations and their bioavailability for plants, and both biochars had similar such effects. AMF inoculation of corn plants had little effect on heavy metal bioavailability in either control or biochar amended soil, and no interaction between biochar and AMF was observed. Changes in DTPA extractable metals following biochar addition to soil were correlated with metal uptake by plants, whereas pore water metal concentrations were not predictive indicators. This research demonstrates positive benefits from biochar application for contaminated soil remediation, but remain ambiguous with regard to the benefits of simultaneous AMF inoculation on reduction of heavy metal bioavailability.
authors: China Agricultural University, Beijing, China. Electronic address: qiaoyh@cau.edu.cn.
authors: Yuhui
authors: Y
authors: Qiao
authors: University of California Riverside, Riverside, California, USA.
authors: David
authors: D
authors: Crowley
authors: China Agricultural University, Beijing, China.
authors: Kun
authors: K
authors: Wang
authors: China Agricultural University, Beijing, China.
authors: Huiqi
authors: H
authors: Zhang
authors: China Agricultural University, Beijing, China.
authors: Huafen
authors: H
authors: Li
mesh_terms: D001682:Biological Availability; D002606:Charcoal / Q000737:chemistry*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D006801:Humans; D019216:Metals, Heavy / Q000032:analysis* / Q000633:toxicity; D038821:Mycorrhizae / Q000737:chemistry*; D012722:Sewage / Q000737:chemistry; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis* / Q000633:toxicity; D003313:Zea mays / Q000737:chemistry
chemical_list: D019216:Metals, Heavy; D012722:Sewage; D012987:Soil; D012989:Soil Pollutants; C540010:biochar; D002606:Charcoal
keywords: Biochar; Contaminated soil; Glomalin; Potentially toxic elements