摘要
研究了大田土壤点源滴灌施肥条件下滴头流量(q)和灌水施肥量(Q)对土壤NH4+-N扩散分布的影响,分析水平和垂直两方向上NH4+-N含量的变化规律。结果表明:随滴头流量和灌水量的增大,水平垂直两方向的最大湿润距离增大,且随滴头流量增大,表层积水区半径增大。滴头流量在一定尺度增大会改变NH4+-N在土壤湿润体内的运移扩散方式,进而影响扩散边缘处的NH4+-N浓度和最大扩散距离。灌水施肥量增大使NH4+-N随水运移扩散的距离增大,使扩散区域内NH4+-N浓度提高。
The experiment was conducted to investigate the influence of dripping end flow and irrigation volume on the distribution pattern of NH4^＋-N in soil, and to analyze the change rules of NH4^＋-N concentration in horizontal and vertical directions. The results showed that the biggest wetting distances in both horizontal and vertical directions were expanded along with the increase of dripping end flow and irrigation volume, and the surface seeper radius was also expanded along with the increase of dripping end flow. An increase of dripping end flow in certain scale could change the distribution pattern of NH4^＋-N in wet soil, and influence the NH4^＋-N concentration in the spread boundary and the biggest spread distance. As the volume of irrigation and fertilization was increased, the spread distance of NH4^＋-N was enlarged and the NH4^＋-N concentration in the spread zone was enhanced.
出处
《干旱地区农业研究》
CSCD
北大核心
2006年第1期51-55,共5页
Agricultural Research in the Arid Areas
基金
"863"子课题(2001AA242101)"黄土高原几种典型土壤水肥一体化研究"
关键词
滴灌施肥
土壤氮素分布
滴头流量
灌水量
铵氮(NH4^+-N)
dripping irrigation and fertilization
N distribution in soil
dripping end flow
irrigation volume
NH4^＋-N
