NH4+对K+在土壤肥际微域中迁移和转化的影响
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* 国家自然科学基金项目(No.40071051);国家重点基础研究发展规划项目(No.G1999011802)资助


EFFECT OF NH4+ ON MOVEMENT AND TRANSFORMATION OF K+ IN FERTILIZER MICROSITES IN SOILS
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    摘要:

    NH4+和K+共施在农田施肥中是很普遍的现象,研究它们共施后二者在土壤中的交互作用对指导施肥具有重要意义。采用室内土柱实验研究了共施条件下NH4+对K+在红壤和潮土肥际微域中的迁移和形态转化的影响,供试肥料为NH4Cl和KCl。试验结果表明,与单施K+相比,共施NH4+没有改变肥料钾在红壤和潮土中的迁移距离,但提高了肥际微域中的水溶性钾含量;在靠近施肥点附近,NH4+的施用减少了土壤交换性钾含量,这种作用在潮土中的表现不如在红壤中明显;与单施KCl相比,共施NH4Cl明显降低了施肥点附近土壤微域内的非交换性钾含量。研究结果表明,共施NH4Cl减少了土壤晶格对钾离子的固定,增加了钾的淋溶风险。

    Abstract:

    It is a common way to apply NH4+ and K+ together in farming.Effects of NH4+ on movement and transformation of K+ in fertilizer microsites in red soil and Fluvo-aquic soil were studied through an incubation experiment using soil columns.The fertilizers used in the experiment were NH4Cl and KCl.Compared with the treatment of application of K+ alone, the treatment of addition of NH4+ did not show any effect on diffusion distance of fertilizer K but did increase the concentration of water-extractable K in fert ilizer microsites.In the soil close to the fertilizer placement site, the concentration of exchangeable K was decreased as a result of the addition of NH4+, which was not so apparent in Fluvo aquic soil as in red soil.Besides, the addition of NH4+ significantly decreased the concentration of nonexchangeble K in fertilizer microsites, suggesting that the addition of NH4+ reduced K fixat ion in soil crystal lattices, thus increasing the risk of K leaching in the two soils.

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杜振宇,周健民,王火焰,杜昌文,陈小琴. NH4+对K+在土壤肥际微域中迁移和转化的影响[J].土壤学报,2007,44(3):492-498. DOI:10.11766/trxb200602310316 Du Zhenyu, Zhou Jianmin, Wang Huoyan, Du Changwen, Chen Xiaoqin. EFFECT OF NH4+ ON MOVEMENT AND TRANSFORMATION OF K+ IN FERTILIZER MICROSITES IN SOILS[J]. Acta Pedologica Sinica,2007,44(3):492-498.

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  • 收稿日期:2006-02-28
  • 最后修改日期:2006-06-24
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  • 在线发布日期: 2013-02-25
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