›› 2019, Vol. 31 ›› Issue (12): 2084-2094.DOI: 10.3969/j.issn.1004-1524.2019.12.18

• Environmental Science • Previous Articles     Next Articles

Impact of long-term returning of Astragalus sinicus L. on content and forms of Cd in different depths of paddy soils

XIE Jie1,2, DONG Aiqin1,*, XU Changxu1, SU Jinping1, FAN Fang1, HU Meirong1, LIU Jia1   

  1. 1. Institute of Soil and Fertilizer & Environment and Resources/National Engineering and Technology Research Center for Red Soil Improvement, Jiangxi Academy of Agricultural Sciences, Nanchang 330200, China;
    2. College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510462, China
  • Received:2019-08-12 Online:2019-12-25 Published:2019-12-25

Abstract: To study the effect of cultivation and returning of Astragalus sinicus L. on vertical migration and form changes of soil Cd in medium-and long-term scale, soil samples were collected on paddy fields with long-term cultivation and returning of A. sinicus. The soil pH, contents of organic matter (OM) and dissolved organic matter (DOM), Cd content and forms were analyzed. It was shown that, the pH and the OM content in different soil layers were higher with long-term cultivation and returning of A. sinicus. Long-term cultivation and returning of A. sinicus significantly (P<0.05) increased DOM content in surface soil layer (0-20 cm), yet showed no significant leaching effect on soil Cd. However, the proportion of bioactive Cd forms in each soil layer was elevated with long-term cultivation and returning of A. sinicus. Compared to soil OM content, the ratio of dissolved organic carbon to soil organic carbon (DOC/SOC) and pH showed better linear correlation with Cd forms.

Key words: leaching, dissolved organic matter, cadmium forms

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