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应用生态学报 ›› 1999, Vol. 10 ›› Issue (5): 579-582.

• 研究论文 • 上一篇    下一篇

白浆土植物系统营养物质转化机制及其有效性研究Ⅳ.环境条件对土壤磷素有效性的影响

李法云, 高子勤   

  1. 中国科学院沈阳应用生态研究所, 沈阳110015
  • 收稿日期:1998-09-03 修回日期:1999-04-29 出版日期:1999-09-25 发布日期:1999-09-25
  • 通讯作者: 李法云,男,30岁,博士,副教授,现为湖南农业大学博士后,主要从事土壤生态与污染生态化学方面的研究,已发表论文20篇.
  • 基金资助:

    国家自然科学基金资助项目(49471043).

Transformation mechanism and availability of nutrients in albic soil-plant system Ⅳ Effect of environmental factors on phosphorus availability in albic soil

Li Fayun, Gao Ziqin   

  1. Institute of Applied Ecology, Academia Sinica, Shenyang 110015
  • Received:1998-09-03 Revised:1999-04-29 Online:1999-09-25 Published:1999-09-25

摘要: 根际试验研究表明,水分、有机质、土壤酸度是影响白浆土磷素生物有效性的重要因子。调节土壤水分含量,能增强土壤中铁、铝磷酸盐的溶解,加速磷酸根离子从根际土壤向非根际土壤扩散。增加土壤有机质含量,降低了土壤对P素的吸附自由能(K值),提高土壤中的速效磷含量。适量施用石灰,调节白浆土酸度,由于化学溶解作用的影响,促进了土壤中铁、铝磷酸盐的溶解,增强了土壤中磷素的生物有效性.

关键词: 根际, 水分, 有机质, 土壤酸度, 磷素有效性

Abstract: Rhizospheric experiment shows that the contents of soil moisture and organic matter and soil pHare the important factors affecting phosphorus availability in albic soil. Regulating soil moisture content could increase the solubility of iron and aluminum phosphates, and accelerate the diffusion of phosphatic ions from rhizospheric to non rhizospheric soil. High content of organic matter could decrease the free energy of phosphorus adsorption by soil, inducing an increase of Olsen Pcontent. Asuitable liming application could adjust the soil pHand enhance the solubility of iron and aluminum phosphates, due to the effect of chemical solution, and improve the biological availability of soil phosphorus.

Key words: Rhizosphere, Soil moisture, Organic matter, pH, Phosphorus bioavailability