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《Scientia Agricultura Sinica》 2005-01
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Influence of Silicon on Cadmium Availability and Cadmium Uptake by Maize in Cadmium-contaminated Soil

YANG Chao-guang1, DOU Hu1, LIANG Yong-chao1,2, LOU Yun-shen1 (1 College of Natural Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095; 2Key Laboratory of Plant Nutrition and Nutrient Cycling, Ministry of Agriculture / Institute of Soil and Fertilizer, Chinese Academy of Agricultural Sciences, Beijing 100081 )  
Pot experiments were conducted to investigate the influence of silicon on soil cadmium fractionation and cadmium uptake by maize (Zea may L. Nongda 108). The results showed that Cd toxicity in maize treated with Cd at 0.1 or 1.0 mmol·kg-1 (added as CdSO4·8/3H2O) was significantly alleviated by addition of 2.0 g·kg-1 sodium metasilicate (NaSiO3·9H2O) due to the decreased Cd uptake by maize. The ameliorative effect of Si was due to lower exchangeable Cd and Fe/Mn oxide-bound Cd, and higher carbonate-bound and residual Cd in Si-treated Cd-contaminated soils compared with non-Si-treated ones. One of the possible mechanisms of Si-enhancement of resistance to Cd toxicity is that silicate alters the Cd forms in soil, resulting in reduction of Cd bio-availability.
【Fund】: 国家自然科学基金资助项目(30170536)
【CateGory Index】: S513
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