湘东某植烟区土壤钙对烟叶镉含量的影响

Effect of Calcium in Tobacco Planting Soil on Tobacco Leaf Cadmium Content in Eastern Hunan

在湖南省东部某植烟区大范围采集了112个土壤样品和烟叶样品,测定并分析了土壤中镉的含量、土壤交换性钙含量、烟叶镉含量及其相关性。结果表明:植烟区土壤镉的含量范围0.08~0.82 mg/kg,平均值0.37 mg/kg,其超标率为58.13%;植烟区内烟叶镉含量范围1.06~20.15 mg/kg,平均值7.29 mg/kg;土壤总钙的平均含量为10 649 mg/kg,交换性钙平均含量为1301 mg/kg。烟叶中的镉含量与土壤中的镉含量呈极显著性正相关,与土壤中的总钙含量及交换性钙含量呈负相关,伴随着土壤中钙含量的增加,烟叶镉的含量有降低趋势。

Soil physicochemical property affects Cd uptake of tobacco. 112 soil samples and tobacco leaves were collected from a national major tobacco growing area in eastern Hunan province. The soil cadmium content, soil exchangeable calcium content,the cadmium content in tobacco leaves and their correlations were determined and analyzed. The result showed that the soil cadmium content of tobacco planting area ranged from 0. 08 to 0. 82 mg/kg,the average value was 0. 37mg/kg,and 58. 17% of the total samples exceeded the soil Cd standard. The content of Cd in tobacco leaves ranged from 1. 06 to 20. 15 mg/kg,the average value was 7. 29 mg/kg. The total calcium content and average exchangeable calcium in soil were 10 649 mg/kg and 1301 mg/kg respectively. The positive correlation between the content of cadmium and calcium in tobacco leaves and cadmium content in soil was significant. Total calcium and exchangeable calcium in soil showed negative correlation with the cadmium content in tobacco leaves, the content of cadmium in tobacco leaves decreased with the increasing calcium content in soil.