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| Regulation of Exogenous Arsenic in Meadow Cinnamon Soils by Applying Layered Double Oxides and Modified Red Mud |
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| KeyWord:layered double oxides; modified red mud; meadow cinnamon soils; exogenous arsenic; As forms; rape |
| Author Name | Affiliation | | SUN Yuan-yuan | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/Kay Laboratory of Agro-Environment, Ministry of Agriculture | | ZENG Xi-bai | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/Kay Laboratory of Agro-Environment, Ministry of Agriculture | | BAI Ling-yu | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/Kay Laboratory of Agro-Environment, Ministry of Agriculture | | WANG Jin-jin | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/Kay Laboratory of Agro-Environment, Ministry of Agriculture | | LI Lian-fang | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/Kay Laboratory of Agro-Environment, Ministry of Agriculture | | SU Shi-ming | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/Kay Laboratory of Agro-Environment, Ministry of Agriculture | | WANG Ya-nan | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/Kay Laboratory of Agro-Environment, Ministry of Agriculture | | DUAN Ran | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/Kay Laboratory of Agro-Environment, Ministry of Agriculture | | WU Cui-xia | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/Kay Laboratory of Agro-Environment, Ministry of Agriculture |
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| Abstract: |
| Using layered double oxides（LDO） and two types of modified red mud（RM1 and RM2） as amendments, simulating incubation and pot experiments with two levels of exogenous As（in 10 and 50 mg·kg-1 respectively） were conducted to study the influences of different incubation times and added amounts of amendments on arsenic（As） availability in soils and As uptake amounts by rape plants. The results indicated that available As decreased with incubation time prolonging. After incubated for 12 weeks, the available As contents of LDO treatment decreased to 1.06 and 5.77 mg·kg-1 when the exogenous As levels were in 10 and 50 mg·kg-1 respectively. With increasing of added amounts of all amendments, easily soluble arsenic（AE-As） contents decreased while calcium-bound arsenic（Ca-As） contents increased. Comparatively, iron-bound arsenic（Fe-As） contents in soils showed a negative correlation with the added amounts of LDO, but a positive correlation with the applied amounts of RM2. The aluminum-bound arsenic（Al-As） contents decreased with the added amounts of RM2 increased. Furthermore, the decreases of As uptake amounts in rape plants were varied to different types of amendments. Among all amendments, applying RM2 could significantly promote the growth of rape and reduce the As uptake amounts in rape plants by 33.7% compared to control as the exogenous As level was in 50 mg·kg-1. Oppositely, applying LDO could inhibit the growth of rape and reduce the As uptake amounts in rape as well. However, LDO is improper choice relative to modified red mud in regulating the availability of arsenic in meadow cinnamon soils. |
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