硅素调理剂在镉超标菜地中的应用效果

doi:10.3864/j.issn.0578-1752.2012.16.010

Abstract

Abstract: 【Objective】The purpose of this study was to explore the effects of application of different amounts of silicon amendment on Cd uptake by leafy vegetables and soil available Cd concentration in cadmium over-standard vegetable field and to provide reference for proper use of silicon amendment to reduce leafy vegetable Cd concentration.【Method】Two field experiments were carried out to investigate Cd bioavailibity in soils and Cd accumulation by leafy vegetables under four levels of silicon amendment application in Cd over-standard fields in the suburbs of Guangzhou in 2009.【Result】The results showed that compared with the control silicon amendment insignificantly increased the output of flowering Chinese cabbage and lettuce grown in Cd over-standard soils, while shoot Si concentrations of flowering Chinese cabbage and lettuce significantly increased by 1.00- and 2.40-fold in the silicon amendment at 60 kg?667m-2 treatment, respectively, and their root of Si concentrations increased by 0.95- and 2.37-fold, respectively. In comparison with the control, the silicon amendment at 60 kg?667m-2 significantly reduced shoot and root Cd concentrations of flowering Chinese cabbage and lettuce, with shoot Cd concentration reducted by 25% and 32% and root by 17% and 15% respectively. Compared with the control, silicon amendment decreased soil DTPA-Cd concentrations significantly, and insignificantly affected soil pH of No. 1 vegetable field, but significantly increased soil pH of No. 2 with no significant differences between application levels.【Conclusion】At the application level of 60 kg?667m-2, silicon amendment could significantly reduce plant Cd content, and might be used as an effective soil amendment to inhibit Cd uptake by vegetables in Cd over-standard soil.

Key words: silicon amendment, leafy vegetable, Cd over-standard vegetable field, application effect

WANG Yan-Hong, AI Shao-Ying, TANG Ming-Deng, LI Meng-Jun, YAO Jian-Wu, LUO Ying-Jian. Effect of Application of Silicon Amendment on Cd Over-Standard Soils of Vegetable Fields[J].Scientia Agricultura Sinica, 2012, 45(16): 3310-3317.

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