黑麦草还田替代尿素对稻田土壤氨挥发的影响

打开文本图片集

中图分类号：S142；S511 文献标志码：A 文章编号：1008-0864（2025）11-0186-09

Abstract：In order to examine the impactof ryegrass treated with urea onammonia volatilization in pady soil， the southern rice-green manure （ryegrass） rotation model was used as a research subject for a pot experiment， and 5dosing ratios were set up：urea alone（CF）， 25% ryegrass +75% urea（ 25% RG）， 50% ryegrass +50% urea （ 50% RG）， 75% ryegrass +25% urea （ 75% RG）and ryegrass alone （ 100% RG），with all treatments applying nitrogenatarateof1OOmgN·kgair-driedsoil.Ammoniavolatilizationrate，riceyieldandsoilenvironmentalindicators were monitored for the rice season under diferent treatments.Theresults showed that the ammonia volatilization rate of all treatments increasedrapidly after urea application，and the peak ammonia volatilization emission decreased with the increase of the proportion of urea replaced by ryegrass.The magnitude of cumulative ammonia volatilization was in the following order： CF>25%RG>50%RG>75%RG>100%RG ，with themaximumvalueof 30.53mg⋅m-2 and the minimum value of 22.07mg⋅m-2 .Compared with CF treatment，the cumulative ammonia volatilizations of ryegrass return to field treatments were reduced by 4.8% ，17.2%，20.7%and 27.7% ， respectively，with the emission factorof 50%RG （ammonia emission intensity per unit of N fertilizer input） was significantlylower（ （P<0.05 ）thanthatofCF.Riceyieldsof the 25%RG and 50%RG treatments were not significantly different from that of CF，but ammoniavolatilization emission intensity of the 50%RG was the lowestanddiffered significantly（ P<0.05 ）fromtheothertreatments.Soiltemperature， pH andammoniumand nitrate nitrogen contents significantly （P<0.05） ）affected theammoniavolatilizationratefrompaddyfields.In conclusion，the 50%RG treatment could effectively slow down the loss of ammonia volatilization from paddy soil while taking into account the rice yield，which was of great significance inreducing nitrogen loss from paddy soil and protecting the ecological environment.

Keywords：ryegrass；urea；ammonia volatilization；soil indicators；rice yield

氨 ⟨NH3 ）是一种影响环境和地表生态系统的碱性微量气体，地表氮素损失是氨挥发的主要来源之一。（剩余18743字）