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水溶性有机碳对玉米根部Cu吸收过程的影响

Keywords: DOM,Cu,玉米,吸收,吸附

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Abstract:

采用水培试验方法,将玉米根部环境设定一系列不同的Cu和水溶性有机物(Dissolvedorganicmatter,DOM)浓度条件,研究Cu在玉米根部的吸附和在玉米植株中的积累变化,同时以水和MgCl2二级提取方法探讨Cu在玉米根部的结合状态。结果表明,附着在玉米根表与根际分泌物结合的Cu很容易受水相DOM存在的影响。与根部吸附位结合的Cu则不易被水相DOM竞争。植物根对Cu的富集浓度超过茎叶,两部分富集量均随暴露溶液Cu浓度的增加而增加,但茎叶中Cu的富集量与暴露Cu浓度呈非线性相关。根内富集Cu与根表吸附位结合Cu呈现良好的对数线性相关。在相同Cu暴露浓度条件下,DOM对植物组织中富集Cu量影响更加不显著。试验发现作为一种有机配位体,DOM暴露浓度较高时对Cu由根表吸附位进入玉米内部这一过程有负作用。

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