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稀土对玉米根际土壤N形态分布及生物有效性的影响

Keywords: 稀土元素,根际,无机氮,有机氮矿化,脲酶,玉米,氮素吸收

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Abstract:

以潮土为例,采用混合氯化稀土和氯化镧,利用根袋法进行盆栽试验,探讨稀土对玉米根际土壤N形态分布及生物有效性的影响。无论是氯化镧或混合氯化稀土,随施用剂量增加,根际与非根际土壤铵态N、硝态和亚硝态N量均显著降低;根际土壤铵态N、硝态和亚硝态N量高于非根际的差异显著削弱。这与根际和非根际土壤脲酶活性和N净矿化量相一致。在高剂量混合稀土或镧(>10mg·kg-1风干土)作用时,根际与非根际土壤中有机N矿化量和有效矿质N量显著降低。玉米根系和地上部分N累积量均随稀土剂量增加而降低。在稀土对土壤有效矿质N、脲酶活性和有机N矿化以及植株N吸收的影响方面,混合稀土和镧具有相似性。

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