China Agricultural University, Beijing, China.
University of California Riverside, Riverside, California, USA.
Environ Pollut. 2015 Nov;206:636-43. doi: 10.1016/j.envpol.2015.08.029. Epub 2015 Aug 28.
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.
研究了在 20 世纪 70 年代施用污水污泥 35 年后，玉米秸秆在 300°C/500°C 热解得到的生物炭和丛枝菌根（AMF）作为可能的土壤修复处理方法，分别和联合应用于修复受 Cd、Cr、Ni、Cu、Pb 和 Zn 污染的土壤。结果表明，生物炭显著降低了重金属浓度及其对植物的生物利用度，两种生物炭均具有相似的效果。AMF 接种玉米植株对对照或生物炭改良土壤中重金属的生物利用度几乎没有影响，也未观察到生物炭和 AMF 之间存在相互作用。生物炭添加到土壤中后 DTPA 可提取金属的变化与植物对金属的吸收有关，而孔隙水金属浓度不是预测指标。这项研究证明了生物炭应用于污染土壤修复的积极益处，但对于同时接种 AMF 对降低重金属生物利用度的益处仍存在不确定性。
