Abstract: By the methods of water culture, microwave digestion, and inductively coupled plasma (ICP), this paper studied the effects of boron (B) addition on the distribution of B in different parts of ‘Cuiguan’ pear (Pyrus pyrifolia) seedlings and its relationships with the absorption and allocation of P, K, Ca, Mg, Fe, Zn, Mn, and Cu. After treated with B, the B concentration in the seedlings was in the order of leaf > root > stem, and increased with increasing B addition. Root responded more intensively than leaf and stem. Higher B addition had significant effects on the allocation of test eight elements in the seedlings. With increasing B addition, root P, K, Mg, Zn, Mn, and Cu concentrations increased while Ca and Fe concentrations decreased, but the translocation coefficients of the eight elements all increased. The stem P, Ca, Mg, Zn, Mn, and Cu concentrations increased but K and Fe concentrations decreased with increasing B addition, the translocation coefficients of P and K increased, that of Fe had less change, while the translocation coefficients of other elements decreased. As for leaf, the P, K, Mn, and Cu concentrations increased with increasing B addition, Zn and Fe concentrations were in adverse, Ca and Mg concentrations decreased after an initial increase, and the translocation coefficients of the elements except Zn and Mn increased.

Key words: Phytoplankton, Estuarine ecosystem