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氮肥形态对伴矿景天生长和锌镉吸收性的影响研究

DOI: 10.11654/jaes.2014.11.007, PP. 2118-2124

Keywords: 氮肥形态,伴矿景天,Zn,Cd,吸收性

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Abstract:

以锌镉超积累植物伴矿景天为供试植物,采用单边根袋法盆栽试验研究了铵态氮肥和硝态氮肥施用对植物根际和非根际土壤中Zn、Cd的化学行为,以及伴矿景天生物量和Zn、Cd吸收性的影响。结果表明,施用硝态氮肥更能提高根际土壤Zn和Cd的生物有效性,显著增大植物体内Zn和Cd浓度(P<0.05),增率分别为38.2%和110%,但施用铵态氮肥更有利于促进伴矿景天的生长,增率为49.4%;氮肥形态对伴矿景天生物量的影响显著大于对植物地上部Zn、Cd浓度的效应,施用铵态氮肥显著提高Zn和Cd总吸收量,增率分别为53.3%和123%,施用硝态氮肥对其则无显著影响。施用铵态氮肥较硝态氮肥更能提高伴矿景天的污染土壤Zn、Cd吸取修复效率。

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