关键词: 土壤, 辣椒, 重金属, 生物富集系数, 迁移系数

Abstract: Samples of whole capsicum(Capsicum frutescens L.var.longum Bailey)plants and root soils were collected from capsicum fields in three villages in the suburbs of Guiyang,Southwest China to study characteristics of heavy metal transportation in the soil-capsicum system.Results show that the fields were polluted with heavy metals to a varying degree,with integrated pollution index being 1.17,1.23 and 2.18,respectively.Zn,Cd and Cu were the major pollutants.However,in the capsicum fruit only Cd was overproof.Transportation ability of the measured heavy metals follows a decreasing order of Cd Cu>Zn>Pb in the soil/root interface,Zn>Cd>Pb>Cu in the stem/root interface,and Cu Zn>Cd>Pb in the fruit/stem interface.And the soil/root interface was the main barrier for Cu,Pb and Zn to enter into capsicum fruit,and their bio-concentration factor(BCF) was in the range of 0.21～0.44,0.04～0.24,and 0.033～0.08,respectively.However,Cd accumulated in the root,with its BCF being in range of 1.06～4.23.Its translocation factors(TF1) demonstrated that there was almost no hindrance for it in the root/stem interface,but its TF2 being in the range of 0.42 and 0.51 revealed that its translocation was impeded in the stem/fruit interface.

Key words: soil, capsicum, heavy metals, bio-concentration factor, translocation factor