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| Bioconcentration and Translocation of Cu and Zn by Three Crops Grown in Exogenous Cu and Zn Added Soil |
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| KeyWord:crop; exogenous Cu and Zn; pig manure; soil; bioconcentration; translocation |
| Author Name | Affiliation | | WANG Yu-hong | College of Agronomy, Jiangxi Agricultural University, Nanchang 330045, China | | LI Bao-tong | College of Agronomy, Jiangxi Agricultural University, Nanchang 330045, China | | TANG Li-mei | College of Agronomy, Jiangxi Agricultural University, Nanchang 330045, China |
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| Abstract: |
| Bioaccumulation and translocation of soil Cu and Zn by garlic（Allium sativum）, Chinese cabbage（Brassica rapa） and corn （Zea mays） grown in a soil added with pig manure and exogenous Cu and Zn were investigated in pot experiment. Three treatments, pig manure 10 g·kg-1, pig manure 10 g·kg-1 + Cu 63 mg·kg-1 + Zn 54 mg·kg-1, pig manure 10 g·kg-1 + Cu 126 mg·kg-1 + Zn 108 mg·kg-1, were employed with soil receiving no pig manure or exogenous Cu or Zn as the control. Results showed that adding pig manure only could significantly increase the biomass of crops, while pig manure with high concentrations of exogenous Cu + Zn could inhibit the growth of crops, compared with the CK. Such inhibition was in order of cabbage>garlic>corn and root>stem or leaf. The concentration of Zn was significantly greater than that of Cu for three crops at each treatment. For garlic, Cu was mainly accumulated in the stems and leaves, while Zn distributed mostly in the roots. For Chinese cabbage and corn, Cu was largely present in roots, but Zn most in stems and leaves. Copper concentrations in three crops were lower than the National Food Health Standard（10 g·kg-1）, but Zn concentrations in Chinese cabbage and corn were higher than the National Food Health Standard（20 g·kg-1）, and Zn in garlic with low Cu and Zn addition was lower than the standard. Total and available Cu and Zn in soil were significantly positively correlated with Cu and Zn concentrations in stems, leaves and roots of garlic, Chinese cabbage and corn（P<0.01）. Both bioconcentration factor and translocation factor of Zn were greater than those of Cu for three crops at every treatment. The bioconcentration factor was garlic>Chinese cabbage>corn for Cu, whereas Chinese cabbage>corn>garlic for Zn. Bioconcentration factors of Cu and Zn for three crops were slightly greater in treatments with pig manure only than with pig manure plus exogenous Cu and Zn, being decreased with increasing Cu and Zn additions. The translocation factors of Cu and Zn decreased in Chinese cabbage and corn. In garlic, Cu translocation factor increased, but that of Zn decreased. |
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