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Wang, LJ,Liang, T,Hu, AT,Ding, SM,Zhang, CS,Yan, X
Journal Of Rare Earths
Accumulation and fractionation of rare earth elements in soil-rice systems
Optional Fields
accumulation fractionation paddy soil pot experiment rice rare earths GROWN PLANTS
Accumulation and fractionation of rare earth elements (REEs) were studied through applications of exogenous REEs in soils with pot-cultured rice for 2 years. The results show that the biomass of rice consistently decreases at sprouting and maturity stages when the amount of exogenous REEs are over 400 mg center dot kg(-1). It illustrates that the endurance of rice to exogenous REE exposure is much weaker than that of wheat. The distribution patterns of REEs in rice of the control are similar to that in the soil, both exhibiting light REE (LREE) enrichment and positive Tb in the roots and the aboveground parts. Applications of exogenous REEs ranging from 400 to 1200 mg - kg - 1 have significant effects on the distribution patterns of REEs in roots, some effects in stems and leaves, and almost no effects in grains. Accumulation rates of REEs in different organs follow the order of roots > leaves > stems > panicle axes and crusts > grains. The roots take up different REEs at almost the same rates, except for the selective accumulation of Tb. In the aboveground pails, the accumulation rates of middle REEs (MREEs) and heavy REEs (HREEs) are higher than those of LREEs, there are significant selective accumulations of Eir and Th. Accumulation rates of REEs in the roots, stems and leaves increase with the increasing applications of exogenous REEs, but they change slightly in the particle axes, crusts and grains, demonstrating that it is easier for the roots, stems and leaves to accumulate exogenous REEs. Selective accumulation and fractionation of exogenous Nd are also observed in rice organs including grains.
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