氮肥对镉污染土壤上小油菜生长及镉吸收特征的影响
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重金属污染土壤对主要农作物品质影响的评价研究


Effect of nitrogen fertilizer on rape growth and uptake characteristics of cadmium
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    摘要:

    利用盆栽试验,研究了氮肥种类和尿素用量对小油菜(Brassica chinensis Linn)产量和镉含量以及土壤有效态镉含量变化的影响。结果表明,硝酸钙显著提高产量,硫酸铵的增产效果最差。硝酸钙能提高土壤pH值,钙离子可使土壤中有效态镉含量增加。相对于普通尿素,包膜尿素对土壤pH值影响不大,但能明显降低土壤有效态镉含量;其他肥料使土壤pH值降低,土壤有效态镉含量升高,施用硝化抑制剂双氰胺(DCD)效果更明显。相对于硝酸钙,施用尿素和硫酸铵能显著降低小油菜根系和地上部镉含量,但小油菜对镉的转移系数与氮肥种类及用量无关。高量尿素显著降低土壤pH值,但尿素用量对其他指标无影响。

    Abstract:

    A pot experiment was conducted to study the effects of different kinds and amount of nitrogen fertilizers on cultivating rape(Brassica chinensis Linn)growth and soil properties.Results showed that the treatment of calcium nitrate was the highest increasing yield compared with no fertilizer application.However,the effect of ammonium sulfate increasing yield was not obviously shown.Calcium nitrate could also increase soil pH greatly,and added Ca2+ ion played a dominant role in increasing the content of available cadmium in soil.Coated urea did not influence soil pH,but could greatly decrease the availability of cadmium compared with normal urea; Soil pH value of other treatments(especially DCD application)decreased,and the soil available Cd content increased in response to their soil acidification.Use of urea and ammonium sulfate could decrease the cadmium content in the root and aerial portion of rape compared with calcium nitrate,but the translocation factor had nothing to do with the kinds and amount of nitrogen fertilizers.The treatment with excessive application of urea got a higher soil pH than other doses.

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刘安辉,赵鲁*,李旭军,史胜红,蒋增,杨涵默.氮肥对镉污染土壤上小油菜生长及镉吸收特征的影响[J].中国土壤与肥料,2014,(2):77-81.

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  • 收稿日期:2013-04-12
  • 最后修改日期:2013-05-27
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  • 在线发布日期: 2014-04-14
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