植物营养与肥料学报2025，Vol.31Issue(2)：201-212,12.DOI:10.11674/zwyf.2024305
双氰胺对肥料氮去向的影响依赖于土壤类型
The influence of dicyandiamide on the fate of fertilizer nitrogen depends on soil types
摘要
Abstract
[Objectives]Given that the efficacy of DCD varies in different soils,we studied the precise efficacy of nitrification inhibitor dicyandiamide(DCD)on maize growth,fertilizer nitrogen(N)recovery efficiency,and the N fate in different soil types,to establish a theoretical foundation for the scientific application of DCD in maize N management.[Methods]A soil column leaching experiment was carried out using 15 N-labeled urea.The columns were filled with one of the three soil types(red soil,black soil,and fluvo-aquic soil),and DCD was applied at 10%of the urea N application rate or omitted as a control.Water(100 mL)was added to the soil at the 10,17,22,26,31,36,and 46 days post-sowing of maize to collect leachate for the measurement of ammonium and nitrate N.After 57 days,the maize plants were harvested to determine their yield and N content in both the aboveground parts and roots.Additionally,the ammonium-and nitrate-N content in the residual soil was measured.[Results]Regardless of DCD application,the N leaching patterns in all three soils exhibited similar temporal trends.The majority of ammonium N,nitrate N,and total N leaching occurred during the initial three leaching events,peaking during the first event and then declining rapidly thereafter.Urea N leaching was primarily concentrated in the first leaching event.DCD reduced nitrate leaching by N 0.74 to N 5.76 mg/kg soil across all three soils,with the smallest reduction observed in red soil.While DCD had no significant effect on urea leaching,it increased ammonium leaching in red and fluvo-aquic soils,with the highest increment in fluvo-aquic soil(N 2.99 mg/kg soil).The effectiveness of DCD in reducing N leaching was correlated with the soil's nitrification capacity,following the order black soil>fluvo-aquic soil>red soil.DCD effectively minimized fertilizer N leaching and enhanced soil N retention in black and fluvo-aquic soils,but had no significant impact on red soil and even increased the fertilizer N leaching rate therein.DCD significantly inhibited gaseous N loss in red and black soils but increased it in fluvo-aquic soil.Across all three soils,DCD improved fertilizer N recovery efficiency for maize,with the greatest improvement observed in black soil.However,DCD only increased maize biomass in fluvo-aquic soil.Compared to fluvo-aquic and red soils,black soil exhibited higher maize fertilizer N recovery efficiency,lower N leaching,and lower gaseous N losses,attributed to its favorable soil conditions for optimal maize growth and minimal fertilizer N loss.[Conclusion]The effects of applying DCD on maize growth,N fertilizer use efficiency,and the fate of fertilizer N vary among soil types,primarily due to soil properties.Black soil and fluvo-aquic soil exhibit strong nitrification,so the application of DCD is more effective in reducing the leaching loss rate of fertilizer N and increasing the soil residual rate of fertilizer N,whereas its effectiveness is poorer in red soil.The application of DCD significantly inhibits gaseous N losses in red soil and black soil but increases gaseous N losses in fluvo-aquic soil.This may be attributed to the higher pH of fluvo-aquic soil,where DCD leads to the accumulation of ammonium-N,potentially causing increased ammonia volatilization.关键词
玉米/氮肥利用率/氮淋溶/15N同位素示踪/肥料氮去向Key words
maize/fertilizer nitrogen recovery efficiency/nitrogen leaching/15N isotope tracing/fertilizer nitrogen fate引用本文复制引用
肖珣,王玥凯,代文台,沈仁芳,赵学强..双氰胺对肥料氮去向的影响依赖于土壤类型[J].植物营养与肥料学报,2025,31(2):201-212,12.基金项目
国家自然科学基金项目(42077101,31672229). （42077101,31672229）
