Effects of calcium cyanamide on bioavailability of cadmium in cadmium contaminated soil
The effects of different amount of calcium cyanamide on cadmium(Cd) bioavailability in Cd contaminated soil were studied in a field experiment, by using lime as comparison. The results showed that certain amount of lime or calcium cyanamide application could significantly increase the acid soil pH values, and decrease the available Cd content in soil and Cd content in rice. Compared with the control(with no amendment application), the soil pH values increased significantly, the soil available Cd content decreased by 12.6%(P<0.05), and the Cd content in rice stem and leaf and that in brown rice deceased by 25.5%(P<0.05) and 28.3%(P<0.05), respectively, with application of 1200 kg·hm-2 lime; while with 600 kg·hm-2 calcium cyanamide application, the soil pH values increased significantly as well, the soil available Cd content decreased by 10.9%(P<0.05), and the Cd content in rice stem and leaf and that in brown rice decreased by 36.8%(P<0.05) and 33.0%(P<0.05), separately. Calcium cyanamide treatment was more effective than lime treatment on decreasing available Cd content in soil and Cd content in rice with equal amount(600 kg·hm-2). Thus, besides lime, calcium cyanamide can be used to improve acidic heavy metal contaminated soil, and it is a potential soil amendment.
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NSTL
万方数据
维普
