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两种生态型东南景天(Sedum alfredii Hance)根系互作效应对植株生长及吸收利用土壤Zn的影响

Keywords: 东南景天,根系,,套种

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Abstract:

采用盆栽套种方法探讨了不同程度根系互作对两种生态型东南景天的生长和吸收利用土壤Zn的影响,以及超积累生态型东南景天的根系是否能活化土壤中难利用态Zn。不同程度的根系互作采用不同隔膜处理,即无隔膜处理、400目尼龙筛布隔开和PVC板隔开。结果发现,当两种生态型东南景天套种时,不同程度的根系互作对非超积累生态型东南景天的地上部和根系的生物量、根系Zn含量有显著影响。当与超积累生态型东南景天的根系完全交互作用或采用400目尼龙筛布隔开时,非超积累生态型的根系Zn含量显著增加,其地上部和根系生物量比其单种时显著减少。这些结果间接表明,超积累生态型东南景天根系能够活化土壤中的难溶态Zn。

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