黄檗幼树根韧皮部和茎干基部的韧皮部中主要药用成分含量很高，而叶片、木质部和周皮很低。
The alkaloid contents were highest in root and stem base phloem of Amur corktree saplings, and lower in leaves, xylem and periderm.
许多人认为树根是向下生长的，但实际上树的大部分根系是向四周生长的 - 它们能穿过厚厚的土向四周伸展，树多高，根就伸多远。
Many people think that roots grow downward, but actually most of roots grow in all direction after they through the heavy earth. How tall the tree and how far the roots extend.
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