不同固态羊粪管理模式的氨和温室气体排放特征OA

To elucidate the effects of different sheep manure management practices on greenhouse gas(N2O,CH4,CO2)and ammonia(NH3)emissions,this study employed a laboratory simulation approach with four treatments,including non-separated sheep manure(G),feces-urine separated sheep manure(FG),non-separated sheep manure with bacterial agents(G+),and feces-urine separated sheep manure with deodorizing bacterial agents(FG+).The impact of feces-urine separation and deodorizing bacterial agent addition on nitrogen loss and greenhouse gas(GHG)emissions was investigated during sheep manure storage.The results showed that Nitrogen loss in the G and G+treatments was primarily caused by NH3 emissions,whereas it was jointly driven by N2O and NH3 emissions(with N2O-N accounting for 17.99％and 21.75％,respectively)in the FG and FG+treatments.Compared with the G and G+treatments,nitrogen loss decreased respectively by 42.08％and 43.77％in the FG and FG+treatments.Compared with the G and FG treatments,the addition of bacterial agents reduced nitrogen loss by only 2.76％and 5.68％in the G+and FG+treatments,respectively.GHG emissions in the G and G+treatments mainly originated from indirect N2O emissions induced by ammonia emissions(accounting for 89.94％and 78.25％,respectively),with the remainder largely attributable to CH4 emissions.In contrast,GHG emissions in the FG and FG+treatments were predominantly due to direct N2O emissions(accounting for 94.34％and 95.47％,respectively),with CH4 emissions contributing minimally.Compared with the G and G+treatments,GHG emissions in the FG and FG+treatments increased by 86.93％and 87.09％,respectively.In conclusion,feces-urine separation technology in large-scale meat sheep farming can effectively reduce nitrogen loss from sheep manure,which may lead to an increase in GHG emissions at the farm level due to significantly higher N2O emissions.Therefore,there is an urgent need to further explore and develop N2O emission reduction technologies for sheep manure management,providing critical technical support for the green and low-carbon development of the sheep farming industry..