Characteristics of soil water and nitrogen transport in duelpoint infiltration under surgeroot irrigation for red soil region#br#
(1. College of Agricultural Engineering, Henan University of Science and Technology, Luoyang, Henan 471003, China; 2. School of Hydraulic and Ecological Engineering, Nanchang Institute of Technology, Nanchang, Jiangxi 330099, China)
Abstract： Through the field infiltration experiment, setting five concentrations of fertilizer solution, the cumulative infiltration volume, the migration distance of wet front, the soil moisture and the migration of ammonium and nitrate nitrogen were determined. The results show that when the concentrations of fertilizer solution are 0, 0.46, 1.39, 3.24, and 5.55 mmol·L-1, the wetting fronts intersection time are 201, 198, 187, 179, and 171 min, respectively, and the relationship between intersection time and fertilizer solution concentration exhibits exponential function. With the increasing of the concentration of fertilizer solution, the cumulative infiltration volume of soil and the migration distance of wet front at intersection are increased, while the relationship between migration distance of wet front and infiltration duration exhibits logarithmic function. At the end of irrigation, with the increasing of the concentration of fertilizer solution, the soil moisture content and the mass concentrations of ammonium nitrogen and nitrate nitrogen in wet body are all increased in the same soil layer, while the distributions of water and nitrogen are different. At the distance of 5 cm to 15 cm from the irrigator, the soil moisture content is droped sharply, while at the distance of 15 cm to 25 cm, the decreasing of soil moisture content is small. The ammonium nitrogen in wet body is mainly distributed from 0 cm to 60 cm. In the area near to the irrigator, the content of ammonium nitrogen is increased, and the interaction has slight effect on the distribution of ammonium nitrogen. The nitrate nitrogen in wet body has the largest content for the soil depth from 40 cm to 60 cm. At the horizontal direction, the content of nitrate nitrogen at 5 cm from the irrigator is the largest, and the smallest content of that is at 15 cm from the emitter.
代智光， 赵新宇， 胡盛明. 红壤区涌泉根灌双点源入渗水氮运移特性[J]. 江苏大学学报（自然科学版）, 2021, 42(2): 229-234.
DAI Zhiguang, ZHAO Xinyu, HU Shengming. Characteristics of soil water and nitrogen transport in duelpoint infiltration under surgeroot irrigation for red soil region#br#[J]. Journal of Jiangsu University(Natural Science Eidtion)
, 2021, 42(2): 229-234.
