Effect of earthworms (Eisenia fetida) on the fractionation and bioavailability of rare earth elements in nine Chinese soils

被引：77

作者：

Wen, Bei ^{[1
]}

Liu, Ying ^{[1
]}

Hu, Xiao-yu ^{[1
]}

Shan, Xiao-quan ^{[1
]}

机构：

[1] Chinese Acad Sci, State Key Lab Environm Chem & Ecotoxicol, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China

来源：

CHEMOSPHERE | 2006年 / 63卷 / 07期

基金：

中国国家自然科学基金;

关键词：

earthworm; dissolved organic carbon; fractionation; bioavailability; rare earth elements;

D O I：

10.1016/j.chemosphere.2005.09.002

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The effect of earthworm (Eisenia fetida) activity on soil pH, dissolved organic carbon (DOC), fraction distribution pattern and bioavailability of rare earth elements (REEs) Y, La, Ce, Pr and Nd in nine Chinese soils were investigated using pot experiments. A three-step extraction procedure recommended by the European Community (Standards, Measurements and Testing Programme) was used to fractionate REEs in soils into water soluble, exchangeable and carbonate bound (B1), Fe- and Mn-oxides bound (B2) and organic matter and sulfide bound (B3). Inoculated with earthworms, the soil pH, DOC and water-soluble rare earth elements fraction increased. A significant correlation was obtained between the increased DOC and the increased water-soluble REEs. REEs in fraction B1 increased after earthworm inoculation, while those in fraction B3 decreased. No significant differences were observed for REEs in fraction B2. The biomass and the concentrations of REEs in wheat shoots and roots increased after the treatment with earthworms. The results demonstrated that earthworm activity increased the mobility and bioavailability of REEs in soils. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：1179 / 1186

页数：8

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