Speciation of rare earth elements in soil and accumulation by wheat with rare earth fertilizer application
作者： Shuzhen Zhang , Xiao-quan Shan
DOI: 10.1016/S0269-7491(00)00143-3
关键词:
摘要: A greenhouse study was conducted to investigate the accumulation of rare earth elements (REEs), La, Ce, Pr and Nd, in winter wheat (Triticum aestivum L.), speciation these soil following application REE-based fertilizers. Improved crop yield confirmed by experiment. The behavior La: Nd varied depending on concentration REE fertilizer application, i.e. increased with increasing at low fertilization constant over medium range, decreased high application. Significant negative correlation obtained between contents roots pH (r = -0.5787 -0.8442 for La). REEs both fertilized unfertilized soils were fractionated a three-stage sequential extraction procedure into three chemically distinct fractions: water soluble, exchangeable carbonate bound (B1), Fe-Mn oxide (B2), organic sulfide (B3). found mainly B2 B3 fractions, only small amount B1 fraction. fractions negatively correlated -0.6892 -0.8927 -0.7462 -0.9482). fraction root. coefficients ranged from 0.6159 0.7410 when lower than 20.0 mg/kg soil. No acceptable relationship observed shoot any extractable soils. (C) 2001 Elsevier Science Ltd. All rights reserved.
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