水科学进展2011，Vol.22Issue(4)：568-573,6.DOI:32.1309.P.20110709.1622.014
河岸带表土层氮素非饱和入渗运移规律模拟
Simulation of nitrogen infiltration and movement through unsaturated soil in topsoil layer of riparian zone
摘要
Abstract
An experimental study was conducted in an indoor soil tank to examine to nitrogen infiltration and movement through unsaturated soil in topsoil layer of riparian zone. The timing of seepage flow from the tank and the seepage sequence at different sampling points were monitored. The variation of nitrogen concentrations ( e. G. , total nitrogen TN and ammonia NH4+ -N) was also observed. Results show that the vertical velocity of percolation water is larger than the horizontal one during infiltration into the unsaturated topsoil layer of riparian zone. In the process from dry-to-wet and wet-to-dry, the TN and NH4+ -N concentrations first has a sharp increase and then gradually decrease until reaching a stable state. This is true for every monitoring point. In addition, the nitrogen retention capacity in the top-soil layer of riparian zone is high under unsaturated conditions. Along the 1. 08 m long slope and 11 hours after the experiment began, the TN and NH/-N concentrations at points 12 cm below the surface reduce by 74. 23% and 68.02% , respectively.关键词
河岸带/表土层/氮素/非饱和入渗/运移/土槽Key words
riparian zone/ topsoil layer/ nitrogen/ unsaturated infiltration/ transport/ soil tank分类
资源环境引用本文复制引用
钱进,王超,王沛芳,侯俊,艾小榆..河岸带表土层氮素非饱和入渗运移规律模拟[J].水科学进展,2011,22(4):568-573,6.基金项目
国家自然科学基金资助项目(50909035) （50909035）
江苏省自然科学基金攀登人才项目(BK2008041) （BK2008041）
中央高校基本科研业务费专项资金项目(2009B17214) （2009B17214）
