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应用生态学报 ›› 2001, Vol. ›› Issue (2): 233-236.

• 研究论文 • 上一篇    下一篇

土壤湿度水平和湿-干循环对硝酸钙盐积累土壤锰释放的影响

司友斌, 马友华, 章力干   

  1. 安徽农业大学, 合肥230036
  • 收稿日期:1999-12-27 修回日期:2000-04-17 出版日期:2001-03-25
  • 通讯作者: 司友斌,男,1968年生,现为中国科学院南京土壤研究所在职博士生,主要从事土壤圈物质与养分循环研究,发表论文10余篇.E-mail:youbinsi@21cn.com
  • 基金资助:
    安徽省教委自然科学基金资助项目(97JL0067)

Effect of soil moisture and wetting-drying on Mn release in Ca(NO32-amended soils

SI Youbin, MA Youhua, ZHANG Ligan   

  1. Anhui Agricultural University, Hefei 230036
  • Received:1999-12-27 Revised:2000-04-17 Online:2001-03-25

摘要: 在[Ca(NO3)2]盐处理土壤中,研究了两种湿度水平(200、400g·kg-1)和湿干循环对土壤Mn释放的影响.结果表明,土壤水分状况影响土壤Mn的有效性,湿度大时,易还原态Mn转化为水溶态、交换态Mn;盐分对易还原态Mn的转化有一定影响,NO3-能缓冲土壤Eh的下降,有抑制易还原态Mn转化的作用.连续的湿干循环能使土壤2价Mn(水溶态Mn、交换态Mn)浓度降低,而Ca(NO3)2盐能增加Mn的不溶性.这在Mn含量低的土壤上,最终将导致Mn的缺乏.

Abstract: A study on the effects of two moisture levels (200 and 400g·kg-1) and wetting-drying on the solubility of Mn in Ca(NO3)2-amended soils showed that water regime was a factor affecting Mn availability.Easily reducible Mn was transformed into soluble and exchangeable Mn,when soil water content was high.Salt had a definite effect on the transformation of easily reducible Mn.NO3- could decrease soil redox potential,and inhibit the transformation of easily reducible Mn.Wetting-drying significantly(α<0 05) decreased the content of soil water-soluble and exchangeable Mn,while Ca(NO3)2 increased the insolubility of Mn,which might eventually lead to the deficiency of soil Mn.

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