[Objective] This study was conducted to investigate soil heavy metal Pb pol ution level and spatial distribution characteristics at two sides of arterial traffic in Yel ow River delta area. [Method] Soil samples were col ected by sample-plot sur-vey method, and soil Pb pol ution condition in road area of Yel ow River delta was determined and analyzed by atomic absorption spectrometry. [Result] Pb pol ution at two sides of national road G205 and provincial road S312 was mainly from auto-mobile exhaust, and Pb content in soil decreased with the distance from road in-creasing. Soil samples col ected at points with distances in the range of 1-50 m from truck road of G205 was 32.46-86.04 mg/kg, which was 1.2-3.3 times of soil Pb background value in this area, and the pol ution was more remarkable. Further study showed that green belt aside road could effectively reduce soil Pb pol ution level. [Conclusion] This study provides theoretical basis and basic information for in-vestigation of soil heavy metal Pb pol ution level and spatial distribution characteris-tics at two sides of arterial traffic in Yel ow River delta area.
Objective] The aim was to investigate the effects of Pb stress on seed germination and seedling growth of Chenopodium glaucum and Chenopodium serot-inum L. [Method] With C. glaucum and C. serotinum as the study objects, the ef-fects of different concentrations of Pb on their seed germination and seedling growth, as wel as on the leaf SOD, POD and CAT activity were studied primarily. [Result] The germination potential of both the two kinds of weed seeds increased first and then decreased with the increase of Pb concentration. The germination po-tential of C. serotinum and C. glaucum seeds reached the peak at Pb concentration of 25 and 50 mg/L, respectively. With the increase of Pb treatment concentration, the germination rate, germination index and vigor index of C. serotinum and C. glaucum seeds decreased, and their bud length and root length also reduced gradu-al y. ln overal , the leaf SOD, POD and CAT activity of C. glaucum and C. serot-inum_ seedlings increased first and then decreased with the increased treatment concentration of Pb. The leaf SOD and POD activity of C. glaucum and C. serot-inum seedlings reached the maximum at Pb concentration of 200 and 100 mg/L, respectively, and the leaf CAT activity reached the maximum at Pb concentration of 100 mg/L. [Conclusion] The two Chenopodium species had strong tolerance to Pb stress, and they could be used as alternative accumulator plants of soil Pb contami-nation.
