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纳米银对黑麦草生长特性的影响

DOI: 10.11654/jaes.2015.04.005

Keywords: 纳米银 根系 植物毒性 黑麦草

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Abstract:

利用土壤盆栽试验,以硝酸银作对照,探讨了纳米银对黑麦草生长特性的影响。结果表明,纳米银和硝酸银对植株根系的抑制作用均大于对地上部的抑制作用,银浓度为20 mg·kg-1的纳米银与硝酸银处理根冠比最大,分别为2.43、2.33,说明低浓度银对植物生长有促进作用。当纳米银浓度大于20 mg·kg-1时,随浓度增加黑麦草生物量下降,根系长度减小,平均直径增加,根尖数减少,并且纳米银对黑麦草根系生态学特性的抑制作用强于同浓度普通银离子,说明纳米银对植物毒害的机理不只是因为纳米银能转化为离子态银,还与其粒径小、比表面活性高等纳米特性有关

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