土壤氧化还原电位(Eh) (一)土壤氣还原体糸( soil redox system Oxidation Oxidation: A reaction in which atoms or molecules gain oXygen, oe lose hydrogen or electrons Fe2+=Fe3++e Reduction Reduction a reaction in which atoms or molecules lose oXygen, or gain hydrogen or electrons 2+H2=NH3四.土壤氧化还原电位（Eh） （一）土壤氧还原体系（soil redox system) Oxidation Oxidation: A reaction in which atoms or molecules gain oxygen, oe lose hydrogen or electrons Fe2+=Fe3++e￾Reduction Reduction: A reaction in which atoms or molecules lose oxygen, or gain hydrogen or electrons: N2+H2=NH3