Accumulation and Chemical Forms of Cadmium in Tissues of Different Vegetable Crops

Large areas of arable lands in China have been contaminated by heavy metals, which cadmium (Cd) contamination was the most prevalent. Cd accumulation main food crops and leafy vegetables grown Cd-contaminated fields has aroused considerable attention recent years. The present study investigated pollution farmland soils Qujing city Yunnan Province, China. By comparing uptake capacities different crops, this aimed to provide guidance for agricultural production farmland, clarify influence bioavailability soil chemical forms plant roots on its migration. Results showed that concentration up 37 mg kg−1, 61-fold higher than environmental quality standard Concentration 73% vegetable samples, with mean value 5.43 kg−1 (dry weight basis), exceeded safety Leafy had highest bioaccumulation factors (BF) transfer (TF), values 0.53 0.41, respectively. Water spinach (Ipomoea aquatica Forsk.), cole (Brassica campestris L.), fennel (Foeniculum dulce Mill.) TFs, averages 0.67, 0.66, 0.64, On contrary, garlic (Allium sativum onions fistulosum pea (Lathyrus odoratus L.) lowest 0.04, 0.03, fraction root insoluble phosphate (35–48%), whereas water root, it pectate, protein binding or sorbed (50–64%), resulting a TF garlic. These results indicate there were significant differences between vegetables, significantly alliums. Therefore, is possible reduce crop edible parts selection species low capacity. fractions roots, especially proportions more mobile fractions, might be an important reason root-to-shoot transport aerial portions.