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赤泥、石灰对Cd污染稻田改制玉米吸收积累Cd的影响

DOI: 10.11654/jaes.2014.11.005, PP. 2104-2110

Keywords: ,玉米,石灰,赤泥,稻田改制

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Abstract:

利用Cd污染稻田改制玉米的大田试验,研究了施用赤泥、石灰对玉米吸收积累Cd的影响。结果表明,施用赤泥、石灰对春玉米、秋玉米产量无显著影响,但与施用石灰相比,施用赤泥能显著增加玉米产量和生物量;施用赤泥、石灰皆显著提高了土壤pH值、显著降低了土壤有效态Cd含量,减少了玉米对Cd的吸收积累;春玉米、秋玉米施用赤泥后其籽粒Cd含量分别比对照降低了27.5%和21.1%,施用石灰后则分别降低了26.4%和31.1%;施用赤泥、石灰皆抑制了玉米对Cd的富集和转运,且赤泥抑制玉米茎、叶、籽粒富集Cd的能力优于石灰,但石灰阻控玉米由茎向籽粒及叶片中转运Cd的能力优于赤泥。大田试验结果还表明,稻田改制玉米结合赤泥、石灰等钝化剂的施用可能是一条实现Cd污染农田安全可持续利用的有效途径,也利于保障国家粮食安全和农产品质量安全。

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