| Autor: |
Chi SL; College of Resources and Environmental Sciences, Southwest University, Chongqing 400715, China., Xu WH; College of Resources and Environmental Sciences, Southwest University, Chongqing 400715, China., Xiong SJ; College of Resources and Environmental Sciences, Southwest University, Chongqing 400715, China., Wang WZ; College of Resources and Environmental Sciences, Southwest University, Chongqing 400715, China., Qin YL; College of Resources and Environmental Sciences, Southwest University, Chongqing 400715, China., Zhao WY; College of Resources and Environmental Sciences, Southwest University, Chongqing 400715, China., Zhang CL; College of Resources and Environmental Sciences, Southwest University, Chongqing 400715, China., Li YH; College of Resources and Environmental Sciences, Southwest University, Chongqing 400715, China., Li T; College of Resources and Environmental Sciences, Southwest University, Chongqing 400715, China., Zhang JZ; College of Resources and Environmental Sciences, Southwest University, Chongqing 400715, China., Xiong ZT; College of Resources and Environmental Sciences, Wuhan University, Wuhan 430079, China., Wang ZY; College of Resources and Environmental Sciences, Southwest University, Chongqing 400715, China., Xie DT; College of Resources and Environmental Sciences, Southwest University, Chongqing 400715, China. |
| Abstrakt: |
Soil incubation experiment and pot experiment were carried out to investigate the influence of nano zeolite (NZ) and ordinary zeolite (OZ) on the soil pH, cation exchange capacity, concentration of soil Cd, soil Cd fraction and Cd uptake by Chinese cabbage when exposed to different Cd pollution levels(1, 5, 10 and 15 mg·kg -1 ). The results of soil incubation experiment showed that the nano zeolite and ordinary zeolite dose(5, 10 and 20 g·kg -1 ) increased the soil pH and cation exchange capacity, and decreased the concentration of soil exchangeable Cd, while increased the concentration of Cd in carbonate, Fe-Mn oxide, organic matter and residual fraction. The lowest EX-Cd was observed in the high nano zeolite (20 g·kg -1 ) treatment. The soil pH and cation exchange capacity was extremely negatively correlated with the concentration of soil exchangeable Cd( P <0.01),and extremely positively correlated with the concentration of soil Fe-Mn oxide Cd( P <0.01). The results of pot experiment showed that the FDC of exchangeable Cd in soil decreased by 6.4%-63.2%, and the FDC of water-extractable and ethnol-extractable Cd in Chinese cabbage decreased by 2.1%-56% and 11.8%-100% with zeolite application, respectively. Moreover, the reduction effect of nano zeolite on Cd concentration in soil and plant was better than that of ordinary zeolite. The FDC of Cd fraction in shoot of Chinese cabbage showed correlation with the FDC of carbonate Cd and organic matter Cd in soil( P <0.05) when exposed to 1 mg·kg -1 Cd pollution. Moreover, correlation was also found in the FDC of organic matter Cd and residual Cd in soil( P <0.05) under 5 mg·kg -1 Cd pollution. |
