摘要
通过大田玉米灌水试验,研究了畦灌和膜孔灌条件下农田土壤水氮运移特性。结果表明：在相同灌水定额条件下,膜孔灌土壤剖面含水率比畦灌土壤剖面含水率变化均匀,0-30 cm土层灌水后1天和灌水后5天膜孔灌土壤含水率比畦灌土壤含水率高19.2%和18.3%; 在相同灌水定额条件下,土壤铵态氮含量受土壤水分运动的影响较小,主要分布在30 cm以上土壤层,膜孔灌条件下土壤铵态氮含量随时间分布比畦灌均匀,其含量最大值为41.6 mg/kg,同畦灌相比铵态氮含量增加了4.3%; 硝态氮含量受灌水方式的影响较大,在相同灌水定额条件下,10-50 cm各土层硝态氮含量膜孔灌比畦灌分别增加了41.3%、96.3%、55.3%、50.7%和46.5%,膜孔灌土壤硝态氮含量随时间和垂直土壤剖面分布均匀,其硝态氮含量主要集中在0-50 cm土层,有利于作物对氮素的吸收,提高氮素利用率。
The soil nitrogen distribution characteristics under conventional border lyzed through field experiment. The results shows that compared with border irrigation, rigation changes uniformly under the condition of same irrigation quota, and the soil and film hole irrigation was anathe soil profile moisture of hole irmoisture of film hole irrigation is 19.2 % and 18.3 % higher respectively than that of border irrigation after one day and five days of irrigation at the depth of 0 - 30 cm; The ammonium nitrogen is mainly distributed in 0 - 30 cm soil layer, and its content is little influenced by soil water movement under the condition of same irrigation quota. The distribution over time of Ammonium nitrogen content in soil under hole irrigation is even more than that under border irrigation. With its maximum value of 41.6 mg/kg, the Ammonium nitrogen content of hole irrigation has increased by 4.3 % compared with that of border irrigation ; The nitrate nitrogen content has largely affected by irrigation way under the condition of same irrigation quota, the nitrate nitrogen content in 0 - 50 cm soil layer under the film hole irrigation has increased by 41.3%, 96.3%, 55.3%, 50.7% and 46.5 % respectively than that of border irrigation. The nitrate nitrogen content of the film hole irrigation distributed uniform over the soil depth and time, and mainly in 0 - 50 cm soil layer, which benefits to the absorption of nitrogen for crops and improvement of nitrogen utilization.
出处
《干旱地区农业研究》
CSCD
北大核心
2010年第1期16-20,共5页
Agricultural Research in the Arid Areas
基金
国家自然科学基金资助项目(50579064)
陕西省重点实验室科研项目(08JZ51)
关键词
畦灌
膜孔灌
含水率
铵态氮
硝态氮
border irrigation
film hole irrigation
moisture content
NO3^- - N
NH4^＋ - N
