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Rare earth elements of a 1000-year paddy soil chronosequence: Implications for sediment provenances, parent material uniformity and pedological changes
Chen, LM (Chen, Liu-Mei)[ 1,2 ]; Zhang, GL (Zhang, Gan-Lin)[ 1 ]; Jin, ZD (Jin, Zhang-Dong)[ 2 ]
2014-10-01
发表期刊GEODERMA
卷号230页码:274-279
文章类型期刊论文
摘要

A series of paddy soil profiles with approximately 50, 300, 700 and 1000 years of paddy cultivation history and an uncultivated mud beach profile under nearly identical landscape and climate conditions were studied. The signatures of rare earth elements (REEs) were used to identify sediment provenances and parent material uniformity of the studied profiles and to assess long-term paddy management effects on REE mobilization and fractionation. The distribution patterns of samples on a delta Eu-N-Sigma REEs plot indicate that the parent materials of paddy soils and the uncultivated soil mainly originate from Yangtze River sediments. The REE chondrite-normalized curve could be used to adequately evaluate parent material uniformity, thus allowing further studies of soil REE changes along a time sequence of paddy cultivation. To understand anthro-pedogenic effects on REE mobilization and fractionation, the REE concentrations of paddy soils were normalized to those of the uncultivated soil. Paddy management resulted in accumulation of all REEs within the upper 100 cm, possibly due to anthropogenic inputs such as irrigation water and phosphate fertilizers. In particular, a distinct positive Ce anomaly was observed. This was likely due to periodic reduction and oxidation processes caused by artificial submergence and drainage. These REE signatures are especially marked in the anthrostagnic epipedon (Ap), as compared with the hydragric horizon (Bg). The positive Ce anomaly increased gradually with increasing paddy cultivation age. This demonstrates the utility of Ce anomaly as a trace of the frequency and intensity of redox conditions. The relative enrichment of all REEs and gradual accumulation with paddy cultivation time in the Ap horizons imply low mobility of REEs in the investigated paddy soils. In conclusion, our study demonstrates the effectiveness of various REE proxies as tracers of sediment provenances and parent material uniformity in present paddy soils. It also reveals the effects of long-term paddy management on REE enrichment and positive Ce anomalies.

关键词Rare Earth Elements Paddy Soils Soil Chronosequence Sediment Provenances Parent Material Uniformity Anthro-pedogenesis
DOI10.1016/j.geoderma.2014.03.023
收录类别SCI
语种英语
引用统计
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/9687
专题加速器质谱中心
通讯作者Zhang, GL (Zhang, Gan-Lin)[ 1 ]
作者单位1.State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China;
2.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China
推荐引用方式
GB/T 7714
Chen, LM ,Zhang, GL ,Jin, ZD . Rare earth elements of a 1000-year paddy soil chronosequence: Implications for sediment provenances, parent material uniformity and pedological changes[J]. GEODERMA,2014,230:274-279.
APA Chen, LM ,Zhang, GL ,&Jin, ZD .(2014).Rare earth elements of a 1000-year paddy soil chronosequence: Implications for sediment provenances, parent material uniformity and pedological changes.GEODERMA,230,274-279.
MLA Chen, LM ,et al."Rare earth elements of a 1000-year paddy soil chronosequence: Implications for sediment provenances, parent material uniformity and pedological changes".GEODERMA 230(2014):274-279.
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