Impact of Single Cadmium, Lead and Their Combination Pollution on Pepper Biomass and Residues of Heavy Metals

Pepper plants were cultured under single cadmium, lead and their combination pollution in the potted experiment. The biomass of pepper was determined and the contents of 10 kinds of metals were measured by chemical analysis. Heavy metals remarkably decreased the pepper production, and the effect of combination pollution was higher than that of single Cd, Pb. Single pollution of Cd reduced the dry matter of root, stem and fruit remarkably, but had no the same effect on leaves. To some extent, single Pb enhanced the growth of pepper, with the root/shoot improving simultaneously. The concentrations of Cd was higher than Pb in the pepper, and the average enrichment of Cd and Pb was rootfruit. Pb mainly centralized in root and was hardly found in fruit. Under the combination pollution, the root was seriously harmed and could not absorb more mineral elements, even lost its instinct absorption. The contents of Cd, Pb, Zn, K, Ca, Mg were enhanced while Cu, Mn, Mo reduced under Cd treatment; Pb treatment increased the absorption of Pb, Zn, Mg and decreased K, Cu, Fe, Mn, Mo; the absorption of mineral elements under combination pollution was relatively complex.