Selection Of Low Accumulation Of Heavy Metals In Vegetable Varieties And Accumulation Of Heavy Metals In Vegetable Under Salt Stress

Heavy metals were introduced to soil environment from crustal mainly via anthropogenic industry activities and then threaten human health by bioaccumulation. Heavy metals residues in agricultural products are closely related to soil pollution. According to scholars which surveyed the heavy metal contamination of soil origin of Hangzhou vegetable base, selected four types of vegetables which are Eggplants, leafy vegetables, legumes and fruits, respectively. In this study a pot experiment was used to study the influence of three dgerees of heavy metals to four types vegetables’ growth, to select with lower uptake and accumulation of heavy metals, to provide protection for the safe production of vegetables. Meanwhile, a pot experiment was conducted in garden soil pretreated with different concentrations of NaCl. The differences between two leafy vegetables (Brassicachinensis L. and Ipomoea aquatica Forsk) in heavy metals and main osmotic adjustment substances accumulation under salt stress were investigated.The results of low-accumulation of vegetable varieties screening showed that:1) The results showed out that cucumber had the highest and low accumulation of cadmium, In the control group of secondary,which the edible part of the Cd is 0.45 mg.kg-1, were lower than other vegetables significantly.2) The results showed out that tomato had a strong resistance and low chrome chromium accumulation, which the edible portion is not detected Cr, were lower than other vegetables significantly.3) The results showed out that tomato had a strong copper tolerance and low accumulation of copper in vegetables,In the control group of secondary, which the edible portion of Cu is 0.68 mg.kg-1, were lower than other vegetables significantly.4) The results showed out that soybeans had a strong resistance and low zinc accumulation, in the secondary concentration of Zn 37.66 mg.kg-1, were significantly lower than other vegetables.5) With the increase in the pH of the soil metal concentration decreases, after the vegetable planting, soil acidification due to heavy metal contamination resulting from improved slightly, the effect is not obviously. The content of TC, TN and DOC showed substantially increases the concentration of heavy metals in the increased trend.6) After potting, the forms of heavy metals had a significant difference, which the exchangeable content of heavy metals in soil decreased compared with the previous pot. However, Fe, Mn oxidation state, organic bound and residual amount is higher than the state before the pot.A pot experiment was conducted in soil (0.10 mg·kg-1 Cd,74.17mg·kg-1 Cr, 30.06mg·kg-1 Cu,62.75mg·kg-1 Zn) pretreated with different concentrations of NaCl. The differences between two leafy vegetables (lpomoea aquatica Forsk(A) and Brassicachinensis L. (B)) in heavy metals and main osmotic adjustment substances accumulation under salt stress were investigated. The results showed that:1) With the increase of salt stress, two vegetables, roots, leaves Na + content was significantly increased compared with control (P<0.05), K+/Na+ ratio, Ca2+/Na+ ratio decreased significantly.2) After salt stress, two vegetable root, leaf proline content was significantly higher than the control (P<0.05), and spinach showed strong proline synthesis. Two vegetable root, leaf soluble protein content with increasing salt stress intensity decreases. The root vegetable salt promotes the accumulation of two soluble sugars.3) With the increase of soil salt concentrations, two vegetables, root, there is a significant difference in the heavy metal content in leaves, Shanghai’s green roots of heavy metals Cd content than spinach, and with the increasing concentration of soil salinity, Shanghai green roots of Cd increase content.4) Shanghai Green at 0.2%, 0.3% and 0.4% concentration, the amount of Cr is higher than the roots absorb water spinach, then as soil salinity increases.5) Shanghai Aoba unit for Cu uptake increases as salinity increases, the absorption capacity of the roots of Cu was reduced; spinach roots, leaves on Cu absorption volume with decreasing salt concentration is reduced, and the roots of Cu The content than leaves.6) Shanghai leaf and Zn uptake of soil with increasing salt concentration increases, and roots absorption of Zn with increasing soil salinity concentration is reduced; spinach leaves with the absorption of Zn salt reduced increases, and the root is the opposite. These results suggested that spinach leaves had lower Cd uptake, more salt tolerance and stronger osmotic adjustment ability compared with shanghai leaf. For both screening and foster tolerance, the accumulation of heavy metals and low crop to provide reliable scientific reference.