The macroelement factor was higher in Leguminosae plants than in Gramineae plants as the plants of Leguminosae had the capacity of nitrogen fixation.

• 豆科与禾本科相比，豆科植物因其具固氮能力，所含大量元素水平较高，而禾本科植物因细胞壁硅质化，含微量元素稍高；