江苏省典型农田耕作层土壤——谷物籽粒中镉的迁移转化特征

Study on Cadmium Transition and Transformation Characteristics between Typical Cultivated Layer Soil and Cereal Grain in Jiangsu Province

于2013年—2014年通过野外调查和盆栽试验的方法,采集江苏省境内典型农田耕作层（0-20 cm）土壤及其对应点位的水稻/小麦籽粒,分析其中的ω（Cd）（全量、0.01 mol/L Ca Cl2提取态含量和0.05 mol/L Ca Cl2提取态含量）,及Cd在土壤—谷物籽粒系统中的迁移转化特征。结果表明,水稻籽粒（糙米）中ω（Cd）与土壤p H值呈负相关,与0.01 mol/L Ca Cl2提取态含量呈正相关,且相关性在0.01水平下显著,而糙米中ω（Cd）与土壤中Cd总量以及土壤中的ω（有机质）的相关性较弱;麦粉ω（Cd）与0.01 mol/L Ca Cl2提取态含量、土壤中总ω（Cd）和土壤ω（有机质）呈显著正相关,而面粉中ω（Cd）与土壤p H值的相关性较弱,说明淹水可以有效降低水稻对Cd的吸收。

In this paper,the typical cultivated layer soil( 0 ~ 20 cm) and the rice / wheat grain from the corresponding points were gathered through field investigation and pot experiment in Jiangsu province from 2013 to 2014. The concentration of cadmium( total amount,0. 01 mol / L CaCl_2 extracting content and 0. 05 mol / L CaCl_2 extracting content) were analyzed to find the cadmium transition and transformation characteristics between soil- cereal grain system. The results showed that cadmium content in rice grains( coarse rice) was negatively correlated with the soil p H value,but positively correlated with the 0. 01 mol/L CaCl_2 extracting content,and there was a significant correlation under the 0. 01 level. The correlation between cadmium in coarse rice,the soil total cadmium and the soil organic matter was weak. And there was a significantly positive correlation between cadmium in wheat flour and0. 01 mol / L CaCl_2 extracting content,total cadmium and soil organic matter,but the correlation between cadmium in wheat flour and the soil p H was weak,which indicated that the flood could help rice reduce the absorption of cadmium effectively.