The ecological effects of Pb and Cd on the root activities of wheat
小麦根际铅、镉的生态效应

Effect of Pb,Cd on wheat was studied using hydroponic experiments.The results showed that root activities,i.e.the release of proton,exudate of sugar,were related to the contents of Pb,Cd.The pH in the growth medium increased with the increasing concentration of Pb,and decreased with the increasing concentration of Cd in solution.The quantity of sugar exudate increased with Pb,Cd increase and was affected distinctively by Pb\|Cd interaction.The changes in the distribution patterns of Cd and Pb were also studied using an electron probe X\|ray microanalyzer.The content of Cd was lower in the stelbe than that in the cortex.