N的元素循环及相关环境问题与污染控制技术

前言N的元素循环氮污染问题污染控制技术目录目录CONTENTSNitrogenisanelement.Itisfoundinlivingthingslikeplantsandanimals.Itisalsoanimportantpartofnon-livingthingsliketheairaboveandthedirtbelow.Allplantsandanimalsneednitrogentomakeaminoacids,proteinsandDNA.Approximately78%ofthemoleculesinEarth'satmospherearemadeofN2.Mostplantsgetthenitrogentheyneedtogrowfromthesoilsorwaterinwhichtheylive.Animalsgetthenitrogentheyneedbyeatingplantsorotheranimalsthatcontainnitrogen.氮（N)前言NH3N2H4NH2OHN2N2ONONO2-NO2NO3--3-2-10+1+2+3+4+5AmmoniasynthesisplantHigh-energyfuelCoolantProtectivegasInternalcyclingConversionofnitrogenbetweenvariousinorganic,biologicallyreactiveformsandbetweeninorganicandorganicformsofnitrogen.N的元素循环ThenitrogencyclePaltaMM,HilairyEllenHartnett.NitrogenCycle[M].2017.MajorglobalpoolsAtmospheric,terrestrial,andaquaticecosystemskeyfluxThenitrogencycle,nitrogenfixation,isamicrobialprocessthatmovesatmosphericnitrogen(N2)intoaformuseablebyplantsandothermicrobes(NH4+).Biogeochemicalnitrogencycling:globalinventori