Abstract: In order to investigate the effect of insitu passivation on the Cd-contaminated soil, the culture experiment was conducted to study the effects of different types of amendment and addition rate on soil Cd availability and the uptake of Cd by Chinese cabbage. The results showed that with the increase of the addition rate of activated carbon, lime and phosphate rock, the available Cd content in soil and the Cd content in the shoot of Chinese cabbage decreased gradually. Compared with the control, all the treatments of activated carbon, lime and phosphate rock significantly reduced the available Cd content in soil and the Cd content in the shoot of Chinese cabbage. Among them, 5% of activated carbon, 4% of lime and 5% of phosphate rock had the best soil passivation effect. The available Cd content in soil decreased by 25.20%, 49.50%,40.09%, respectively. The Cd content in the shoot of Chinese cabbage decreased by 65.13%,54.64%,67.56%, respectively. With the increases of the addition rate of chicken manure organic manure and zeolite, the available Cd content in soil increased gradually, while the Cd content in the shoot of Chinese cabbage decreased. The treatment with 2% of chicken manure organic fertilizer had the best passivation effect, and the Cd content in the shoot of Chinese cabbage decreased 65.64%. The treatment with 5% of zeolite had the best the effect. The Cd content in the shoot of Chinese cabbage decreased 44.46%. To a certain extent, the addition of fly ash, corn straw and mushroom residue had no significant effect on Cd uptake by Chinese cabbage. So the effects of different types of amendment and addition rate on soil Cd passivation were obviously different. Adding amendments, such as activated carbon, lime, phosphate rock and chicken manure organic fertilizer and optimized rate can effectively reduce Cd content in the shoot of Chinese cabbage.

Key words: Chinese cabbage, Amendment, Addition rate, Cadmium, Absorption

CLC Number: 

• S143.7

• S634.01