Accumulation and Fractionation of Rare Earth Elements in Soil-Rice Systems
来源期刊：JOURNAL OF RARE EARTHS2005年第6期
论文作者：Liang Tao Yan Xin Zhang Chaosheng Wang Lijun Hu Aitang Ding Shiming
Key words：accumulation; fractionation; paddy soil; pot experiment; rice; rare earths;
Abstract: 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 sproutto 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 terns 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 parts, the accumulation rates of middle REEs (MREEs) and heavy REEs (HREEs) are higher than those of LREEs, there are significant selective accumulations of Eu and Tb. Accumulation rates of REEs in the roots, stems and leaves increase with the increasing applications of exogenous REEs, but they change slightly in the panicle 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.
Liang Tao1，Yan Xin2，Zhang Chaosheng3，Wang Lijun1，Hu Aitang4，Ding Shiming1
(1.Institute of Geographical Sciences and Natural Resources Research, CAS, Beijing 100101, China;
2.Institute of Geology and Geophysics,CAS, Beijing 100029, China;
3.Department of Geography, National University of Ireland, Galway, Ireland;
4.College of Resource and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China)
Abstract: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 sproutto 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 terns 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 parts, the accumulation rates of middle REEs (MREEs) and heavy REEs (HREEs) are higher than those of LREEs, there are significant selective accumulations of Eu and Tb. Accumulation rates of REEs in the roots, stems and leaves increase with the increasing applications of exogenous REEs, but they change slightly in the panicle 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.
Key words:accumulation; fractionation; paddy soil; pot experiment; rice; rare earths;
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