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| Effects of bentonite on the characteristics of aggregate structure and organic carbon content in Cd-contaminated soils |
| Received:January 18, 2018 |
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| KeyWord:bentonite;soil aggregate;stability;organic carbon |
| Author Name | Affiliation | E-mail | | WANG Run-long | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China | | | XU Ying-ming | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Tianjin Key Laboratory of Agro-Environment and Agro-Product, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | LI Ran | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | LUO Wen-wen | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | SUN Yue-bing | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Tianjin Key Laboratory of Agro-Environment and Agro-Product, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | sunyuebing@aepi.org.cn |
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| Abstract: |
| Field experiments were conducted to investigate the effects of bentonite on the composition and stability of soil aggregates and organic carbon content during the processes of in situ immobilization remediation of Cd-contaminated vegetable field. The results showed that the amounts of 2~5 mm and 5~8 mm particle aggregates after applying bentonite increased, and the amounts of particle aggregates (<2 mm) decreased, compared to those of the control. The values of geometric mean diameter (GMD) and mean weight diameter (MWD) increased from 9.57% to 33.48% and from 4.74% to 33.39%, respectively, indicating the stability of aggregates improved. In contrast to the CK, the bentonite treatments enhanced the organic carbon in the whole soil and all aggregate particle sizes, but the contents of particle organic carbon in the whole soil and all aggregate particle sizes were inhibited, with a maximum reduction of 11.64%. The contribution rate of the soil organic carbon content in the 2~5 mm aggregates increased under the addition of bentonite, whereas <0.5 mm aggregates showed an opposite trend. The contents of functional groups of alkenes, alkanes, and phenols increased from 1.52% to 4.55%, from 2.60% to 36.28%, and from 2.06% to 10.98%, respectively, from those of the control groups. |
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