| 土壤中La与P迁移的关联性初步研究 |
| 摘要点击 2400 全文点击 1739 投稿时间：2008-09-18 修订日期：2009-04-23 |
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| 中文关键词 源解析 磷肥 稀土元素 La 面源污染 |
| 英文关键词 source appointment phosphorous rare earth elements La non-point source pollution |
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| 中文摘要 |
| 通过室内土柱淋溶试验和人工降雨模拟试验分别观察了元素P和La从土壤表层纵向和横向流失的特征，初步探讨了单一稀土元素La与土施畜禽肥料P随暴雨径流流失的关联性.淋溶试验结果表明，外源La和P在土壤中的纵向迁移都非常困难，La和P的迁移深度分别不超过土壤表层6 cm和8 cm；增加外源La可以降低土壤中水浸提P、NaHCO3浸提P和NaOH浸提P的量，提高HCl浸提P的量，增加残渣态P在TP中的比重；而人工降雨模拟试验结果表明，绝大部分La和总P都是通过径流沉积物相流失（占流失总量的95％以上），对于添加不同剂量的La系列，无论是从土壤表层的流失速率还是流失的总量，总P和La都存在良好的相关性. |
| 英文摘要 |
| Through laboratory lysimeter experiments and artificial rainfall experiments, characteristics of P and La transportation from both vertical and horizontal directions are investigated. The association between La and P loss from soil is preliminarily discussed. Results of lysimeter experiment show that both La and P are difficult to transport vertically. Downward depths are no deeper than 6-8 cm for all forms of La and P. With the increasement of exogenous La amount, the amount of Water soluble P, NaHCO3-extractable P and NaOH-extractable P decrease, while HCl-extractable P and residual form of P increase. Results of artificial rainfall experiment show that majority of La and P transport with fine soil particles in runoff, which is more than 95%. Loss of total P and La in runoff from the manure-applied soil are correlated significantly, both in loss rate and loss amount. |
