| 用TDR确定沙壤土非饱和淹灌条件下NH_4~+的硝化反应及NO_3~-的入渗迁移 |
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| 引用本文： | 孙玉龙,郝振纯,陈启慧,刘凌,张和平.用TDR确定沙壤土非饱和淹灌条件下NH_4~+的硝化反应及NO_3~-的入渗迁移[J].环境科学学报,1997(4). |
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| 作者姓名： | 孙玉龙 郝振纯 陈启慧 刘凌 张和平 |
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| 作者单位： | 河海大学水资源开发利用国家专业实验室 |
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| 摘 要： | 对于沙壤土柱实验，用ＴＤＲ（时间域反射计）结合土壤抽提液的溶质分析，研究了在非饱和灌溉条件下的硝化和ＮＯ－３的迁移．测得的土壤体电导率与土壤抽提液的电导率之比和土壤含水量成线性关系，籍此用ＴＤＲ可以确定非饱和灌溉条件下土壤中溶质浓度的变化规律；硝化过程是在土壤表层的不连通的小孔隙中进行的，几乎不受水分运动的影响；由示踪剂Ｂｒ－的入渗及土壤表层的ＮＯ－３（相当于ＴＤＲ测得的电导率值）入渗分布得出，入渗是按活塞推移作用进行的，借此方法可以研究非饱和入渗的机理．
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| 关 键 词： | 时间域反射计（TDR） 溶质迁移 氮转化 土壤电导 |
A STUDY OF NITRIFICATION OF NH 4 + AND MOVEMENT OF NO 3 - BY TIME DOMAIN REFLECTIOMETRY (TDR) METHOD |
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| Sun Yulong,Hao Zhenchun,Chen Qihui,Liu Ling,Zhang Heping.A STUDY OF NITRIFICATION OF NH 4 + AND MOVEMENT OF NO 3 - BY TIME DOMAIN REFLECTIOMETRY (TDR) METHOD[J].Acta Scientiae Circumstantiae,1997(4). |
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| Authors: | Sun Yulong Hao Zhenchun Chen Qihui Liu Ling Zhang Heping |
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| Abstract: | Unsaturated soil column experiment was conducted with measurement of soil water moisture and soil conductivity by Time Domain Reflectometry (TDR) combined with analysis of soil extract solution. The ratio of conductivity of soil extract solution and soil bulk conductivity measured is linearly related to soil moisture. It shows that TDR can be used to measure the solute movement behavior of unsaturated soil irrigation system, in which nitrification occurs in discontinuous pores at surface layer of soil with litter regard to water movement. From the analysis of Br - and NO 3 - (which is in agreement with conductivity measured by TDR) at upper layer of soil, infiltration process was found following piston movement mechanism. The method can be used to study the movement of water and solute in vandoze zone. |
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| Keywords: | time domain reflectometry solute movement nitrification soil conductivity |
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