| In this paper, two corn straw derived biochars prepared at 400益(BC400) and 700益(BC700) were added
into soil co-contaminated by copper, lead, and cadmium to study the effectiveness of biochars incorporation on ameliorating
co -contaminated soil by soil incubation experiment and pot experiment of pakchoi. The results showed that soil pH
increased by 0.14-0.52 and 0.27-0.78 after BC400 and BC700 addition respectively. Both biochars had the ability to
prompt the inactivation of heavy metals in soil, and reduce metals content of edible part and root of pakchoi. The effect of
decreasing bioavailability of metals in soil enhanced as the application rate of biochar rose. The reducing bioavailability of
metals by different biochar amendments was in the following order: BC700>BC400. At a given biochar content, compared
with BC700, soil amended with BC400 resulted in elevated biomass dry weight of edible part of pakchoi. Meanwhile,
compared with BC700, greater microbial biomass increase was observed with the BC400 application. |
