Abstract
以下辽河平原一组18年的定位试验为平台, 研究长期不同施肥处理作物收获物中Fe、Mn、Zn、Cu含量及其分布。结果表明: 作物收获物中微量元素含量表现为Fe>Mn、Zn>Cu, 且玉米收获物各元素含量远高于大豆; 处理间微量元素含量差异显著, 表现为NPK+M>NPK>M>CK; 作物收获物中微量元素含量与作物籽实或秸秆产量间有显著相关性, 玉米收获物中Fe、Mn、Zn、Cu含量与秸秆产量的线性回归关系中R2分别为0.99、0.94、0.92、0.87, 大豆收获物中Fe、Mn含量与秸秆产量的线性回归关系中<i>R</i><sup>2</sup>均为0.97, Zn、Cu与籽实产量的线性回归关系中<i>R</i><sup>2</sup>分别为1.00和0.97。不同施肥处理间微量元素分配存在变异, 但总体仍表现为玉米收获物中微量元素主要分配在秸秆中, 而大豆籽实富集了大量的微量元素。采用秸秆还田等养分循环再利用措施, 可实现农田微量元素可持续发展, 因而应在农村加强秸秆还田等养分循环再利用措施的应用。
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