Amounts, forms and distribution of zinc and copper in andosols profiles
1997
Rahman, Shahedur | Takaki, Hiroshi | Nagatomo, Yoshitaka (Miyazaki Univ., Miyazaki (Japan). Faculty of Agriculture. Laboratory of Soils and Plant Nutrition)
Amounts, forms and distribution of zinc (Zn) and copper (Cu) of Andosols in Miyakonojo and Takatoge profiles consisting of a fresh layer of volcanic ash ejecta at the top of the surface, in South Kyushu, Japan were investigated. A sequential extraction procedure was used, fractioning heavy metals into exchangeable plus acid soluble (EXS), organically bound (OM), crystalline iron oxide bound (CRYFOX), amorphous iron oxide bound (AMFOX), and residual form (RES). The total distribution of Zn and Cu were 30.7 to 108 mg/kg and 2.34 to 27.8 mg/kg in Andosols of both profiles, respectively. The sequential fractionation of Zn in Andosols of Miyakonojo and Takatoge profile showed that 77 to 92 percent (av.) of the total Zn existed in RES fraction.Whereas the amount of Zn in EXS fraction was very low, 2.09 to 5.64 percent (av.) of the total and in OM fraction 1.75 to 4.85 percent (av.) of the total Zn in Miyakonojo and Takaotoge profiles. The RES fraction of Zn has significantly positive correlation with sand fractions and significantly negative correlation with clay content. From this fact, it may indicate that Zn was existed mainly in primary minerals of the sand fractions. On the other hand, the amount of Cu was low, 34 percent (av.) of the total in RES fraction in the profiles as compared with Zn. Moreover, 20 to 34 percent (av.) of the total Cu was bound in OM fraction. Specially in Miyakonojo, high OM-Cu fraction (47 percent av.) contained high amount of organic matter and the OM-Cu showed significantly positive correlation with OC (r=0.843). Therefore the organic matter may play an important role in Cu distribution of Andosols. The EXS-Cu was high in fresh layer of volcanic ash of Takatoge and also in B and C (pumice) horizons of the profiles.
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