A STUDY ON THE EFFECTS OF LEAD ON SEVERAL KINDS OF CROPS AND ITS TRANSLOCATION AND ACCUMULATION THEREIN
Zhou Hong, Qu Zhongxiang, Wang Huanxiao (University of Yunnan, Kunming)
The present paper, based on simulation experiments upon four kinds of pot-cultivated crops, is designed to study the effects of lead on plants. The experimental results show such effects as demonstrated in shortening of the plant stem and reduction of the biomass. Plants remain most vulnerable to lead at the stages of germination and seedling. Lead absorbed is found largely deposited on the walls of ducts and xylem cells. the absorption of lead varies depending on different parts of a plant; total absorption is positively correlated to lead content in soil; lead content in each part is in positive correlation with the passage of water and nutrients; lead in the plant body can be transported in ways both up and down, yet the downward movement is with more difficulty.