【摘要】 为研究不同地下水埋深和尿素施用量下土壤中水分、盐分以及氮素迁移转化的规律,将地下水埋深和尿素施用量分别设置40、60 cm和10、20g,采用完全组合设计确定试验方案,并对室内土柱试验的结果进行了分析。结果表明,灌水后土壤剖面电导值和硝态氮质量浓度随深度逐渐增大,在灌溉水量相同情况下,减小地下水埋深和增施尿素能够降低浅层土壤(0～39 cm)的储盐量并增加灌水10 d后土壤剖面的矿质态氮量。此外,灌水后土壤中的铵态氮多集中在40 cm以内土层并且增加尿素的施用量对土壤中铵态氮质量浓度影响比改变地下水埋深更明显。更多还原

【Abstract】 Effect of different water table and fertigation practice on migration and transformation pattern of soil N,water and salinity transport was investigated using large Plexiglass columns(20 cm in diameter and 100 cm long).The experiment scheme was designed by completely combination,which simulated two water table treatments(40 cm and 60 cm) along with two fertigation practices(10 g and 20 g urea dissolved in irrigation water,respectively).Findings from this study indicated that the soil profile conductivity and nitrate nitrogen concentration increased with depth.When the irrigation water amount keeps equal,both reduced water table and incremental urea application could decrease soil salt storage of 0～39 cm soil depth as well as increased the mineralization nitrogen 10 days after irrigation.In addition,ammonium nitrogen might assemble in 0～40 cm soil depth after irrigation,and compared with changing water table depth,increasing urea application could affect soil ammonium concentration more obvious.更多还原