腐殖酸对钾在褐土中迁移和转化的影响  

Movement and Transformation of Potassium in a Cinnamon Soil as Affected by Humic Acid

作　　者：杜振宇[1] 王清华[1] 刘方春[1] 马丙尧[1] 

机构地区：[1]山东省林业科学研究院,济南250014

出　　处：《土壤》2012年第5期822-826,共5页Soils

基　　金：山东省优秀中青年科学家科研奖励基金(2007BS08013);山东省农业科技成果转化资金项目资助

摘　　要：采用室内土柱实验研究了腐殖酸与钾共施时腐殖酸对钾在褐土施肥点附件微域中迁移和形态转化的影响。研究结果表明,与单施KCl处理相比,共施腐殖酸没有明显改变肥料钾在褐土中的迁移距离,在培养7天时增加了肥际微域中的水溶性钾含量,而在培养28天时则降低了其含量;共施腐殖酸明显增加了交换性钾含量以及在土壤中的迁移量,但减少了非交换性钾的含量和迁移量。说明共施腐殖酸减少了土壤晶格对钾离子的固定,提高了外源钾在褐土中的有效性。The effects of humic acid （HA） on the movement and transformation of potassium （K） in a cinnamon soil were studied through an incubation experiment by using soil column. Compared with solely application of KCI, the addition of HA did not change the diffusion distance of fertilizer K. The concentration of water-extractable K was increased in fertilizer microsites at 7 d, however, which was reduced at 28 d by the addition of HA. Co-application of HA with K decreased the concentrations of exchangeable K and non-exchangeable K as well as their movement amounts in the cinnamon soil. The results indicated that HA could decreased K fixation by soil and thus increased the availability of added K in cinnamon soil.

关 键 词：腐殖酸 钾:褐土:迁移 转化 

分 类 号：S153.3[农业科学—土壤学]