摘要
通过盆栽实验研究施加农用稀土微肥后，玉米根、茎和叶中稀土元素的含量变化。结果表明，玉米根和茎中稀土元素含量随外源稀土施入量的增加而增大，存在显著剂量效应关系。玉米根和茎中Ｌａ／ＲＥＥ比值随外源稀土施加的浓度增大而逐渐与稀土微肥（常乐）的Ｌａ／ＲＥＥ值趋于一致。发现随着施入稀土元素浓度的增加，玉米吸收的稀土元素逐步转为主要由外源施加稀土微肥贡献为主。随根施剂量加大，玉米根和茎吸收稀土元素的富集系数逐渐增大，说明外源稀土的生物有效性明显高于土壤本身的稀土。稀土元素在苗期的玉米叶片中不产生显著水平的富集。
Accumulation of rare earth elements (REEs) in corn after application of REE-fertilizer was studied by pot experiment and the dose-dependent accumulation of exogenous REEs in different parts of corn was reported. Ratio of La / REE in soil, REE-fertilizers, and different parts of corn was used as fingerprinting in accompany with quantitative information. We found that the exogenous REEs could be incorporated into corn root and stem. When the dose of REE-fertilizer increased, exogenous REEs become gradually dominant in plant root and stem. When doses of REEs increased, REE enrichment factor in corn root and stem increases. It indicates that the bioavailability of exogenous ~ earth element should be significantly higher than that in soil matrix. Incorporation of exogenous REE into corn leaf was found by fingerprinting analysis, but no significant accumulation of REEs in corn leaf was found even at high dosage.
出处
《土壤学报》
CAS
CSCD
北大核心
2000年第3期364-371,共8页
Acta Pedologica Sinica
基金
国家自然科学基金!(批准号:29890280-2-3)
关键词
稀土元素
剂量效应关系
玉米
土壤
Rare earth elements
Dose-dependent accumulation
Corn To whom all correspondences should be addressed
