钾在潮土肥际微域中的迁移与转化  

Movement and Transformation of Potassium in Fertilizer Microsites in Fluvo-aquic Soil

作　　者：杜振宇[1,2] 周健民[1] 王火焰[1] 陈小琴[1] 王清华[2] 

机构地区：[1]中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室,江苏南京210008 [2]山东省林业科学研究院土壤肥料研究所,山东济南250014

出　　处：《水土保持学报》2009年第2期202-205,共4页Journal of Soil and Water Conservation

基　　金：国家“973”项目(2007CB109301);国家自然科学基金项目(30671202);山东省优秀中青年科学家科研奖励基金(2007BS08013)

摘　　要：采用室内土柱实验研究了钾在潮土肥际微域中的迁移和形态转化。结果表明,在室温25℃、土壤含水量332 g/kg和容重1.22 g/cm^3的条件下,经过7 d和28 d的扩散,钾在潮土中的迁移距离为40-75 mm,前期移动较快。在迁移距离内,土壤水溶性钾和交换性钾含量与距施肥点距离呈极显著线性负相关。施肥量和培养时间对水溶性钾和交换性钾含量在肥际微域中的分布均有显著影响,但对非交换性钾含量没有显著影响。外源钾进入土壤后在肥际微域中被固定的部分仅占5.6%-21.5%,绝大部分仍以有效态存在。The movement and transformation of potassium （K） in fertilizer microsites in fluvo-aquic soil were studied through an incubation experiment using soil column. The movement distances of added K were 40-75 mm after 7 d and 28 d. Potassium moved faster within 7 d during the incubation time of 28 d. The concentrations of water-extractable K and exchangeable K had significant negative linear relationships with distance from fertilizer placement in the region of K movement. Both K application amount and incubation time had significant effects on the concentration distributions of water-extractable K and exchangeable K in fertilizer microsites but no significant effects on non-exchangeable K. Most of K was still in available form in fertilizer microsites after moving into soil except that 5.6%-21.5% of applied K was fixed by soil.

关 键 词：钾 红壤 肥际微域 迁移 转化 

分 类 号：S153.3[农业科学—土壤学]