中文摘要：

通过对野鸭湖湿地52个站位表层土壤样品的稀土元素（REE）分布特征及其生态效应的研究，认为野鸭湖湿地地区总稀土元素（∑REE）含量为131．81～217．49mg·kg^-1，平均含量为173．87mg·kg^-1。REE分馏程度较大，在东小营分馏程度最低也达到了4．70。研究区域内8Eu值0．64～0．78，为负异常，8Ce为0．95～0．99，无异常，与该地区土壤处于弱碱性环境相一致。8Ce与8Eu及8Ce与∑REE相关性表明成岩作用对其影响不明显。该地区REE与pH值不相关，与TOC有较好相关性。REE球粒陨石标准化分布模式大致为轻稀土（La—Nd）富集而重稀土（Er—Lu）亏损，图形曲线呈右倾斜。不同植被区，表层土壤中∑REE、轻稀土元素（LREE）、重稀土元素（HREE）均表现为耕地〉林地〉芦苇地〉草地〉底泥，而分异程度耕地最大，林地与草地近似，芦苇地最小，推测湿地环境及人工影响对REE分布及分馏影响较大。在湿地环境中，REE可能更多地参与了生物地球化学循环。

英文摘要：

This paper studied REE distribution characteristics and ecological effects of 52 surface soil samples collected from the wetlands of Yeya Lake. The resuits indicated that REE contents in surface soil of this area ranged from 131.81 to 217.49 mg·kg^-1 , with an average of 173. 87 mg·kg^-1. Fractionation of REE was in larger extent, even the lowest fractionation reached 4.70 in Dong xiaoying. The 8Eu value ranged 0.64 to 0.78 in the study area, meaning negative anomalies. The 8Ce value ranged 0.95 to 0. 99, meaning without anomalies, matched the soil in the region which is a reducing environment. Correlation between 8Ce and 8Eu, 8Ce and ∑REE showed that the diagenesis of the impact was not obvious. REE in the area had little correlation with pH, but a good correlation with TOC. Chondrite-normalized pattern of REE showed that the typical enrichment of light REEs （La to Nd） was relative to that of heavy REEs （Er to Lu）. The graphic curve was right tilt. In different vegetation areas, the average content of ∑REE, LREE and HREE was in order of common cultivated land 〉 woodland 〉 reed 〉 grassland 〉 sediment. How- ever, fractionation was in order of cultivated land 〉 woodland 〉 grassland 〉 sediment 〉 reed. The authors thus consider that the wetland environment and artificial have a larger influence on REE distribution and fractionation. In the wetland environment, the REE cycle have taken a more important part in geochemical