莱州湾滨海盐渍土中铵态氮水平运移室内模拟试验

生态与农村环境学报 ›› 2004, Vol. 20 ›› Issue (4): 41-43，55.doi:

莱州湾滨海盐渍土中铵态氮水平运移室内模拟试验

白冰, 陈效民, 王恒祥

南京农业大学资源与环境科学学院

收稿日期:2004-01-18 出版日期:2004-10-25 发布日期:2011-10-26
通讯作者: 陈效民南京农业大学资源与环境科学学院
作者简介:白冰（1977-），男，山西晋中人，硕士生，主要从事土壤溶质运移与水资源方面的研究。
基金资助:
国家高技术研究发展计划(863计划)(2002AA2Z4061)

Horizontal migration of ammonium nitrogen in seashore saline soil on the coast of Laizhou Bay

BAI Bing, CHEN Xiao-Min, WANG Heng-Xiang

College of Resources and Environmental Sciences,Nanjing Agricultural University

Received:2004-01-18 Online:2004-10-25 Published:2011-10-26
Contact: CHEN Xiao-Min College of Resources and Environmental Sciences,Nanjing Agricultural University

摘要/Abstract

摘要： 莱州湾滨海盐渍土中铵态氮水平运移规律研究表明,铵态氮在水平方向存在运移,运移速率随供试示踪剂源距离的增加而迅速减小,在20cm运移距离内,NH₄+由于受到土壤胶体的吸附而逐渐降低,并呈幂函数关系;铵态氮的水平运移主要由土壤对铵吸附的饱和程度决定,而运移速率主要由铵态氮的浓度梯度和水势梯度控制。铵态氮水平运移速率随土壤含水量的增大而升高,并呈指数曲线变化。铵态氮水平运移的浓度受非饱和土壤水扩散率的影响,并随非饱和土壤水扩散率的升高而呈幂函数曲线下降。

关键词: 铵态氮, 滨海盐渍土, 水平运移, 水分扩散率, 莱州湾

Abstract: Horizontal migration of ammonium nitrogen in seashore saline soil on the coast of the Laizhou Bay was studied.The results show that ammonium nitrogen was moving horizontally at a speed that varied with the distance(0-20 cm)from the tracer source and the content of NH₄+ was also reduced gradually in power function due to adsorption by soil colloid.Horizontal migration was mainly determined by saturation of the soil adsorption of ammonium nitrogen,but its velocity was controlled by the concentration gradient and soil water potential gradient and moreover,in a sharp positive relation with the soil moisture content showing an exponential function.The concentration of ammonium nitrogen in horizontal migration decreased with the increase in unsaturated soil water diffusivity in power function.

Key words: ammonium nitrogen, seashore saline soil, horizontal migration, water diffusivity, Laizhou Bay

中图分类号:

S153

白冰, 陈效民, 王恒祥. 莱州湾滨海盐渍土中铵态氮水平运移室内模拟试验[J]. 生态与农村环境学报, 2004, 20(4): 41-43，55.

BAI Bing, CHEN Xiao-Min, WANG Heng-Xiang. Horizontal migration of ammonium nitrogen in seashore saline soil on the coast of Laizhou Bay[J]. Journal of Ecology and Rural Environment, 2004, 20(4): 41-43，55.

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