摘要
为了探究盐碱土上合理的施氮时序,提高水分调控施氮的效率,开展了9组不同施氮时序影响下的二维土壤水分入渗试验。试验结果表明:单点源从整体上来看,含水率会随着水平方向的推进和垂直方向的加深而变小,在滴头下方(0,0 cm)处含水率是最高的;交汇点含水率在剖面内部形成一个内聚面(两单点源内部提前交汇造成)。单点源的电导率随着湿润锋水平方向的推进和垂直方向的加深会越来越大,电导率最大值出现在最远的湿润锋处;在交汇点处的电导率洗盐效果单从表层土看,比单点源处的要好。在单点源下,N-W-N-W(N—施氮,W—灌水)时序下在此剖面(水平方向0~30 cm和垂直深度0~30 cm所围成剖面)中的含水率最大,比W条件下平均含水率高出了1.45%,而N-W-W-N,N-W分别高出了1.26%,-0.34%;N-W-W-N,N-W-N-W,N-W时序下的电导率比初始值减少392.15,177.57,389.30μS/cm。在交汇点下N-W-N-W时序下的平均含水率比W时序下高出0.57%,而在N-W-W-N,N-W分别高出了-0.68%,-2.26%。N-W-W-N,N-W-N-W,N-W时序下的电导率比初始值减少688.32,142.50,565.97μS/cm。综合分析下得出N-W-W-N,N-W-N-W,N-W时序下保水能力和洗盐效果较其他5种时序要好。该研究结果可为水肥一体化的实施提供参考依据。
In order to explore the reasonable nitrogen application time sequence on saline-alkali soil and improve the efficiency of water-regulated nitrogen application,nine groups of two-dimensional soil water infiltration experiments are conducted under the influence of different nitrogen application time series.The results show that the water content of single point source decreases as the horizontal direction advances and the vertical direction deepens,and the water content is the highest below the emitter(0,0 cm);the water content of intersection point will form a cohesive surface in the profile(due to the early intersection of two single point sources).The conductivity of single point source increases with the advance of horizontal and vertical direction of wetting front,and the maximum value of conductivity appears at the farthest wetting front.The effect of conductivity washing at intersection point is better than that at single point source only from surface soil.Under single point source,the water content in the profile(0~30 cm in horizontal direction and 0~30 cm in vertical depth)is the largest,which is 1.45%higher than the average water content under W condition,while the conductivity of N-W-N and N-W is 1.26%and-0.34%higher respectively,and the conductivity of N-W-N,N-W-N-W and N-W time series is 392.15,177.57,389.30μS/cm less than the initial value.The average moisture content of N-W-N-W sequence is 0.57%higher than that of W sequence at the intersection point,while that of N-W-N and N-W sequence is-0.68%and-2.26%,respectively.The conductivity of N-W-N,N-W-N-W and N-W decreases 688.32,142.50 and 565.97μS/cm compared with the initial value.It is concluded that the water holding capacity and salt washing effect of N-W-W-N,N-W-N,N-W time series are better than those of the other five time series.The research results serve as a reference for the implementation of water and fertilizer integration.
作者
吴晨涛
王春霞
周亮
彭颖超
赵继杰
江天琪
郭蓉
WU Chen-tao;WANG Chun-xia;ZHOU Liang;PENG Ying-chao;ZHAO Ji-jie;JIANG Tian-qi;GUO Rong(School of Water Conservancy and Architectural Engineering,Shihezi University,Shihezi 832000,Xinjiang,China)
出处
《中国农村水利水电》
北大核心
2020年第7期113-118,123,共7页
China Rural Water and Hydropower
基金
国家重点研发计划-西北内陆区保水节水技术集成与应用(2017YFC0404304)
新疆联合基金干旱区膜下滴灌农田生态系统水盐与养分运移及环境效应(U1803244)。
关键词
施氮时序
二维入渗试验
水盐运移
滴灌
盐碱土
nitrogen application timing
two-dimensional infiltration test
water and salt transport
drip irrigation
saline-alkali soil
