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| Effects of Cd-contaminated Rice Straw Incorporation on Transformation of Cd Forms in Soils |
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| KeyWord:rice straw incorporation; Cd pollution; clean soil; Cd-contaminated soil; soil Cd fractions |
| Author Name | Affiliation | | CAO Xiao-ling | Key Laboratory for Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, CAS
Hunan Soil and Fertilizer Institute | | LUO Zun-chang | Hunan Soil and Fertilizer Institute | | HUANG Dao-you | Key Laboratory for Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, CAS | | ZHU Qi-hong | Key Laboratory for Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, CAS | | LIU Shou-long | Key Laboratory for Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, CAS | | RAO Zhong-xiu | Key Laboratory for Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, CAS | | REN Xue-fei | Key Laboratory for Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, CAS | | XI Yuan | Key Laboratory for Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, CAS |
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| Abstract: |
| To investigate the effects of Cd-contaminated rice straw incorporation on the Cd fractions and the available Cd contents in soils（a non-contaminated soil, pH=4.72 and a Cd-contaminated soil, pH=7.90） an incubation experiment（28 d） was conducted. The results indicated that after the addition of rice straw（both contaminated and clean rice straw） the pH in both soils were neutralized（6.0 to 7.5） and the contents of dissolved organic carbon（DOC） in both soils were sharply increased in the first 2 d and reduced gradually in the rest incubation period. At the same time, Cd-contaminated rice straw incorporation significantly increased the DTPA extractable Cd by 23.5%~225.0% and the proportions of acid-extractable and reducible Cd, and relatively decreased the proportions of residual and oxidizable Cd in clean soil. These effects were enhanced with the increasing of Cd-contaminated rice straw added. Whereas, in Cd-contaminated soil, the DTPA extractable Cd was slightly increased firstly, and then decreased（by 28.6%~41.1%） continually during the rest incubation period（2~28 d）when Cd-contaminated rice straw was applied. Moreover, the addition of Cd-contaminated rice straw reduced acid-extractable Cd and simultaneously increased reducible Cd and residual Cd in Cd-contaminated soil. In conclusion, the application of Cd-contaminated rice straw may induce Cd-pollution risk in clean acidic soil and contrarily may reduce the availability of Cd in Cd-contaminated alkaline soil. |
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