Cd Pb单一与复合污染对辣椒生物量及重金属残留的影响

通过盆栽试验和化学分析，研究了重金属Cd、Pb单一与复合污染对辣椒生物量及重金属残留的影响。结果表明：（1）重金属处理显著降低辣椒果实产量，复合污染处理大于Cd／Pb单独处理对辣椒果实重的影响。（2）单一重金属处理在一定程度上可促进辣椒根、茎、叶的生长，增加根冠比；重金属复合作用时，毒害作用逐渐增强。（3）辣椒对Cd的富集能力大于对Ph的富集能力，各部位对Cd、Pb的平均富集能力以根最高，果实最低；Pb一般集中在根部，难于向果实转移且根是受重金属影响最严重的器官。（4）Cd处理增加果实中Cd、Ph、Zn、K、Ca、Mg含量，显著降低Cu、Mn、Mo含量；Pb处理增加果实中Ph、Zn、Mg含量，降低K、Cu、Fe、Mn、Mo含量；复合污染处理对各元素的吸收作用有增有减．作用较为复杂。

Impact of Single Cadmiun, 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 root>fruit. 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.