The distribution and abundance of chemical elements in different parts of Navel orange in Fengjie County, China
奉节脐橙不同器官元素含量分布特征

The distribution and abundance of the common necessary-macroelements (N, K, Ca, Mg, P, S), microelements (Fe, Mn, Cu, Zn, B, Mo), helpful elements (Si, Co, F, Se, Ni, Sr), and toxic elements (Hg, As, Cr, Cd, Pb, Sb, Bi) in the fruit, leaf, trunk and root of Navel orange trees in Fengjie County, China were analyzed in the present study. The results indicated that the absorption and enrichment of these elements in the trees were showing the following patterns: Ca>N>K>Mg (macroelements), Fe>Mn>Zn>Cu>Mo (microelements), Si>Sr>F>Ni>Co> Se (helpful elements), and Pb>As>Sb>Hg (toxic elements) in the leaf, trunk and root. The amounts of common elements and toxic elements in the leaf were significantly more abundant than those in the other parts of Navel oranges. On the other hand, the helpful elements(Si, Co, F, Se, Ni, Sr), toxic element Cr, and microelements Mn, Fe, Mo were significantly richer in the root system; the amount of Zn was greatest in the trunk. The distribution and abundance of the common elements (except N), microelements, and helpful elements in the plant parts were consistent with those in the surface soils; they were controlled strictly by the background contents of the soil. The distribution of the toxic elements was influenced greatly by the crop cultivation and management practices of the farmers.