长期施用稀土对小麦植株中稀土元素含量及分布的影响

EFFECT OF LONGTERM(12 YEAS)REE APPLICATION ON REE CONTENT AND DISTRIBUTION OF SPRING WHEAT AND SOIL

在我国施用稀土时间最长的黑龙江花园农场，研究了连续１２ａ叶面喷施稀土对小麦植株及土壤中稀土元素总含量和分布模式的影响。结果表明：连续１２ａ叶施稀土没有造成土壤中稀土元素含量及分布模式的变化；对小麦拔节始期（喷施稀土７ｄ）后叶部的影响较大，Ｌａ、Ｃｅ量明显增高，叶部稀土元素分布模式与“常乐”稀土中的相一致，与土壤中稀土元素分布模式不同，而在小麦拔节始期的根部、小麦成熟期的根、茎、叶、壳等部位稀土元素分布模式均仍与土壤中的基本一致；研究结果还表明，长期叶施稀土未发现对小麦籽粒中稀土元素含量累积的现象。

Effects of application of rare earth elements(REE) for 12 years on REE content and distribution of spring wheat were studied on experiment farm where REE had been sprayed through leaves for 11 years. Application of REE for 12 years does not affect REE content and distribution in soil.In jointing stage of spring wheat(after application of REE 7 days),REE content in leaves is affected significantly,especially La、Ce,REE distribution of leaves is consistent with that of “chang le”,but has no relationship to soil.Root in jointing stage of spring wheat and root、leaf、stem crustin mature stage of spring wheat are consistent with that in soil,but have no relationships to“chang le”.That long term application of REE through leaves did not affect REE content in spring wheat grain is concluded.