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

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 CaCl_2提取态含量和0.05 mol/L CaCl_2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 CaCl_2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 CaCl_2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。

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

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 CaCl2 extracting content and 0.05 mol/L CaCl2 extracting content) were analyzed to find the cadmium transi-tion 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 pH value , but positively correlated with the 0.01 mol/L CaCl2 extracting con-tent, 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 and 0.01 mol/L CaCl2 extracting content , total cadmium and soil organic matter , but the correlation between cadmium in wheat flour and the soil pH was weak , which indicated that the flood could help rice reduce the absorption of cadmium effectively .