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

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

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

安徽农业大学, 合肥230036

收稿日期:1999-12-27 修回日期:2000-04-17
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（NO₃）₂-amended soils

SI Youbin, MA Youhua, ZHANG Ligan

Anhui Agricultural University, Hefei 230036

Received:1999-12-27 Revised:2000-04-17

摘要/Abstract

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.

关键词: Mn有效性, 硝酸盐, 土壤水分, 湿干循环

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.

Key words: Mn availability, Calcium-nitrate, Soil moisture, Wetting-drying cycles

中图分类号:

S153.6

司友斌, 马友华, 章力干. 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[J]. 应用生态学报, 2001, (2): 233-236.

SI Youbin, MA Youhua, ZHANG Ligan . Effect of soil moisture and wetting-drying on Mn release in Ca（NO₃）₂-amended soils[J]. Chinese Journal of Applied Ecology, 2001, (2): 233-236.

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