水科学进展2017，Vol.28Issue(5)：745-755,11.DOI:10.14042/j.cnki.32.1309.2017.05.012
西藏高原灌区氮素迁移转化特性及模拟方法
Simulation of nitrogen transport and transformation processes in a Tibetan Plateau irrigation district
摘要
Abstract
The objective of this study was to investigate the effects of hydrology processes on the nitrogen transport and transformation in a Tibetan Plateau irrigation district. Field experiments were conducted to measure the quality and quantity of leakage within the soil and loose rock medium and the surface drainage water in the Danniang irrigation district, Nyingchi, Tibet during the hulless barley growing periods in 2014 and 2015. The lateral seepage flux and the NH+4-N and NO-3-N concentrations in the soil and loose rock medium and at the outlet of the drainage canal were moni-tored. A procedure using a stepwise method was proposed to describe the flow and transport processes in the loose rock, and a lump first-order kinetics method was used to describe the process of nitrogen transformation during the seepage and drainage processes. The deep seepage accounted for 26. 2% of the total rainfall and 40. 9% of the total ir-rigation. The total mass of NH+4-N and NO-3-N discharged into the drainage canal accounted for 20. 2% and 25. 1% of the total mass of NH+4-N and the total mass of NO-3-N leached from the soil into the loose rock, respectively. The mean values for system errors, Nash-Sutcliffe efficiency, the relative root mean square error, and the fractional gross error between the simulated and monitored flow rates and nitrogen concentrations at the outlet of the drainage canal were 0. 043, 0. 694, 0. 081 and 0. 242, respectively, indicating that the developed method was applied successfully to sim-ulate nitrogen transport and transformation in the seepage and surface drainage processes.关键词
西藏高原/灌区/农田氮素/通量叠加/径向渗流过程Key words
Tibet Plateau/irrigation district/nitrogen in field/flux superposition/lateral seepage process分类
建筑与水利引用本文复制引用
李玉庆,张存,张文贤,冯晓波..西藏高原灌区氮素迁移转化特性及模拟方法[J].水科学进展,2017,28(5):745-755,11.基金项目
国家自然科学基金资助项目( 51379152 （）
91647109)现场实验工作得到西藏自治区科技厅农牧业科技成果转化与示范项目 "西藏农业面源污染调查与防控技术研究" 和西藏自治区科技厅科技重大专项( Z2016C01G01/07)项目的大力支持. The study is financially supported by the National Natural Science Foundation of China( No. 51379152 （ Z2016C01G01/07）
No.91647109) . （）
