Physical and chemical properties of cadmium-rich soils along the Yangtze River in Nanjing and their biological enrichment of Cd in rice
To explore the migration and transformation of Cd in root soil-rice in cadmium-rich soil along the Yangtze River in Nanjing and further clarify the relationship between rice Cd and soil physical and chemical properties in field environment,300 groups of rice-root soil samples were collected in this area.The correlations between Cd in rice and root soil properties were analyzed,and prediction equations between Cd in rice and influence factors were established.The results showed that the total Cd of root soil in the study area was 0.08～0.58 mg/kg,the Cd content of rice was 0.008～0.150 mg/kg,and the BCF of rice Cd was 1.38%～115.39%.It was significantly correlation between Cd in rice and available Cd,pH,SOM and CEC in soil(p<0.01),the correlation coefficients were 0.51,-0.57,-0.36 and-0.40,respectively.The adsorption capacity of rice to Cd was the strongest when the soil pH value was 6.0～6.5.In the high background value area of soil Cd,the correlation coefficient between rice BCF and soil available Cd was 0.63(p<0.01).Using logarithmic model and multiple regression analysis,a quantitative relationship model between rice Cd and soil available Cd,pH,CEC and SOM was established,which could better predict local rice Cd content,and was of great significance for the safety protection and regulation of Cd-rich soil agriculture along the Yangtze River.
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