The result showed that Cu, Zn, Fe, Mn mostly distributing in the cortex, secondly distributing in the xylem or the marrow, the content is lower in the phloem of rhizome tissue on the cultivated Rheum.

• 结果表明，种植大黄根茎中铜、锌、铁、锰等元素主要分布在皮层，其次是木质部或髓部，元素含量较低的是韧皮部。