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《Journal of Jiling University (Earth Science Edition)》 2004-04
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In situ experiment and numerical simulation on transportation and transformation of "Three Nitrogen" in loess unsaturated zone

JIANG Gui-hua,WANG Wen-ke,YANG Sheng-ke(Institute of Environmental Sciences and Engineering, Chang'an University,Xi'an710061,China)  
On the condition of experiment in situ, the mechanism of transportation and transformation of "Three Nitrogen" in loess unsaturated zone was discussed, and the numerical simulation was carried out, too. Resultants showed that the transportation velocity of nitrate (NO~-_2 or NO~-_3) was fast, it could reach down to the water table. On account of NO~-_2 is poisonous, it has potential danger to environments and groundwater due to the accumulation of NO~-_2 in soils and groundwater. In the process of study on simulating transportation and transformation of "Three Nitrogen", we cannot just regard NO~-_2 as a intermediate of "Three Nitrogen", and ignore NO~-_2 accumulation in soils and groundwater. Moreover, the results showed that simulation results are coincident with datum from experiment, this proved that numerical simulation models established in this paper are good, reliable and can be used to simulate and predict the process of transportation and transformation about "Three Nitrogen" in the unsaturated zone.
【Fund】: 国家重点基础研究发展规划"973"项目(G19990436-06);; 教育部高等学校骨干教师资助计划项目
【CateGory Index】: X592
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