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Pb胁迫对百喜草生长和Pb积累的影响

DOI: 10.11654/jaes.2014.12.004, PP. 2303-2308

Keywords: 百喜草,Pb胁迫,生长指标,根系形态,富集特征

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Abstract:

以水土保持先锋植物百喜草为试验材料,设置不同Pb浓度的室内模拟胁迫试验,定量测定不同浓度Pb处理下百喜草生长及体内重金属含量,分析百喜草对Pb胁迫的耐性及其富集效果.结果表明:百喜草在土壤Pb浓度2500mg·kg-1条件下仍可生长;Pb胁迫对百喜草各生长指标均有一定抑制作用,地上部分表现为分蘖能力>叶最大伸展>苗高,根系表现为根体积>根平均直径>总根长>根表面积;轻度Pb胁迫条件下百喜草根系生物量分配较多,随Pb浓度的增大,生物量分配倾向于地上部分;百喜草对Pb具有一定富集能力,根系和地上部分最高分别为3384.56mg·kg-1和200.70mg·kg-1,根系对Pb的富集能力远大于地上部分,表现出较弱的转移能力.

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