中文摘要：

采用盆栽试验方法研究15个空心菜品种可食用部位对重金属Cd、Cu、Pb和Zn的吸收累积特性，结果表明，空心菜对重金属的平均富集系数由高到低依次为Zn（0．0946）、Cd（0．0740）、Cu（0．0500）和Pb（0．0012）。各空心菜品种可食用部位Cd、Cu、Ph和Zn含量范围分别为0．107—0．175、1．35—3．27、0．091～0．162和23．4～38．9mg·k-1。通过聚类分析可将15种空心菜分成3类，其中进口泰国空心菜、四海农王柳叶空心菜和四海农王大白梗通菜对重金属的累积性较低。对空心菜可食用部位重金属和营养元素含量进行相关性分析，结果显示Cd、Cu含量分别与K、Ca含量呈显著正相关，Zn含量与K、Ca、Na、Mg含量呈显著正相关，Pb含量与营养元素含量没有显著相关性。

英文摘要：

A pot experiment was carried out to study bioaccumulation of Cd, Cu, Pb and Zn in edible parts of 15 cultivars of water spinaches. Resuhs show that concentrations of heavy metals differed sharply from cultivar to cultivar （ P 〈 0.05 ）. By mean enrichment coefficient, the heavy metals followed the diseending order of Zn（0. 094 6）, Cd（0. 074 0）, Cu （0. 050 0） , and Pb（0. 001 2） ; the concentration of Cd, Cu, Pb and Zn in the edible parts of the plants varied in the range of 0. 107-0. 175, 1.35 -3.27, 0. 091 -0. 162, and 23.4- 38.9 mg ·k-1, respectively. Cluster analysis of the concentrations of heavy metals shows that the 15 cultivars could be sorted into three groups. Among them Thai cuhivar, Sihainongwang willow-leaf cultivar and Sihainongwang Dabaigeng cultivar were low in heavy metal accumulation. Correlation analysis shows that Cd and Cu were significantly related to K and Ca, and Zn was to K, Ca, Na and Mg, while Pb did not show any significant relationship with any nutrient elements.