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《Journal of Agro-Environment Science》 2017-05
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Effects of water management and phosphate application on the transformation of Cd in paddy soil

LONG Ling-zhi;LI Zhong-wu;LUO Ning-lin;ZHANG Qiu;HUANG Mei;College of Environment Science and Engineering,Hunan University;Key Laboratory of Environment Biology and Pollution Control,Ministry of Education,Hunan University;  
In order to investigate the effect of water management and phosphate application on the transformation of Cd in paddy soil, incu-bation experiments were carried out under four water managements, namely 75% field capacity(75%FC), field capacity(FC), continuous flooding(CF)and flooding-drying(FD). KH_2PO_4 was added into the soil with the molar ratio of KH_2PO_4/Cd at 2∶1. The pH values and concentrations of CaCl_2-extractable Cd in soil samples were determined, and the European Community Bureau of Reference(BCR)sequential extraction procedure was conducted to analyze the fraction distribution of Cd. The results showed that, compared to the control groups, the application of KH_2PO_4 reduced CaCl_2-extractable Cd by 10.0% and 37.3% for FC and CF treatments, respectively, whereas increased its concentration by 12.5% and 9.5% in 75%FC and FD treatments, respectively. The fraction distribution results of Cd revealed that phosphate application slightly promoted the transform of Cd from acid-soluble fraction to reducible and oxidizable fractions. The proportions of acidsoluble Cd decreased significantly in the 75%FC treatment which was benefit for the stabilization of Cd, in contrast, higher acid-soluble Cd concentrations were observed in FD treatments, suggesting a higher-risk of leaching and migrating of Cd in soil. It was observed that pH var-ied remarkably during the incubation period, and there was a significant negative correlation(r=-0.861 8)between CaCl_2-extractable Cd content and soil pH in 75%FC treatment. As for CF and FD treatments, the reduction process of flooding had a complicated impact on the availability of Cd. In summary, water management and phosphate application had an interaction on CaCl_2-extractable Cd, and the stabilization effect of phosphate application on Cd was better in the case of 75%FC, furthermore, water management was the main influential factor controlling the transformation of Cd in paddy soil.
【Fund】: 国家自然科学基金(51521006);; 湖南省科技重点研发计划项目(2015SK2004)~~
【CateGory Index】: X53
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