期刊论文

Water Flow and Nitrogen Distribution in Soil under Negative-pressure Irrigation

中文

灌溉排水学报

1672-3317

2019

38

6

44-49

10.13522/j.cnki.ggps.20180654

湖南省大学生研究性学习和创新实验计划项目(DFCXS201601) 国家自然科学基金项目(41471185) 湖南省重点研发计划项目(2016JC2032).

本校为第一机构

[目的]揭示负压水肥一体化灌溉对红壤水分及氮素运移特征的影响.[方法]配置6种不同质量浓度硝酸铵溶液(0、10、15、20、25、30 mg/L),设置无压(负水头高度为0)和负压(1/2极限负水头高度)2个水平进行红壤入渗试验,分析了其入渗特性及氮素分布规律.[结果]硝酸铵溶液促进水分入渗,无压和负压状态下,入渗溶液质量浓度为25 mg/L和15 mg/L时水平与垂直方向湿润锋运移均达到最大,与相应CK相比累积入渗量最大分别增长2.69倍和3.00倍,平均入渗率分别增长2.38倍和2.18倍;土壤硝态氮和铵态氮量显著增加(p

[Objective]Negative-pressure irrigation is a new irrigation technology and in this paper, we investi- gate its impact on water flow and nitrogen distribution in red soil under different combinations of irrigation amount and nitrogen application.[Method]Ammonium nitrate was used in the experiment and we compared six concentrations: 0, 10, 15, 20, 25 and 30 mg/L, under two water pressure treatments: zero pressure and pressure at 1/2 of the limit negative head height.[Result]Application of ammonium nitrate facilitated water infiltration. Un- der zero and negative-pressure irrigation, water moveme...