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 investigate 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. Under...