Absorption Characteristics Analysis of Pb and Cd from Soil by Phyllostachys pubescens Shoots

The aim of this study was to investigate the characteristics of Pb and Cd accumulation and its redistribution in organs of bamboo shoots grown on contaminated soils. Effects of four combinations of two heavy metals Pb and Cd,as polluter at both light pollution(5 mg·m^-2),moderate pollution(50 mg·m^-2),heavy pollution(500 mg·m^-2)and non-treated,respectively. Bamboo shoots was grown on Pb- and Cd-contaminated soils under natural conditions,and the accumulation,transport,and organ redistribution of Pb and Cd were then analyzed at various growth stages. The results showed that Pb and Cd accumulation by bamboo shoots was significantly greater in soils with over time and a higher Pb and Cd content. The Pb content of the edible part of bamboo shoots were under national food hygiene standards(1.0 mg·kg^-1)except excess of the standard with heavy pollution on the 21 th day;The Cd content of the edible part of bamboo shoots with mild and moderate pollution were 0.02~0.14 mg·kg^-1,lower than the national food hygiene standard(0.2 mg·kg^-1),but higher than the national food hygiene standard after the 14th d. under serious contamination after polluting 21 d,the accumulative percent of Pb,Cd in organs of bamboo shoots showed the following pattern:roots(73.84%,72.79%),under part(6.33%,6.97%),central part(2.52%,1.95%),top part(2.68%,0.52%),shell(14.63%,17.77%),respectively. The bioaccumulation factor(BCF)and the translocation factor(TF)of Pb and Cd in bamboo shoots gradually increased with an over time. This implied that Pb and Cd had obvious biological accumulation effect in the bamboo shoots,were easily transferred to aboveground parts,and resulted in serious pollution of the plant's organs and tissues.