施用硫酸铵对酸性紫色土硝化作用的影响  

Effects of (NH_4)_2SO_4 on Nitrification of Acidic Purple Soils

作　　者：熊仕娟 苏静[1] 闫小娟[1] 蒋先军[1] 

机构地区：[1]西南大学资源环境学院,重庆400716

出　　处：《西南大学学报（自然科学版）》2015年第11期131-136,共6页Journal of Southwest University(Natural Science Edition)

基　　金：国家自然科学基金(41271267)

摘　　要：以重庆北碚区酸性紫色土为研究对象,采用室内恒温(28±1℃)培养的方法,研究了施用不同量的氮肥对紫色土硝化作用的影响.结果表明,在培养0到14d,CK,100,200mg/kg(NH4)2SO4处理均促进了土壤的硝化作用,净硝化率分别为0.92,1.15,1.50mg/(kg·d),土壤pH值分别降低了0.16,0.35,0.51个单位,施用的氮肥量越大,土壤硝化作用越强,pH下降越多.培养14d后,各处理土壤NH+4-N和NO-3-N含量的变化均趋于平缓,硝化作用基本停止,CK,100,200 mg/kg处理土壤净硝化率分别降至0.220,-0.071,-0.187 mg/(kg·d),土壤pH分别比初始土壤pH值降低了1.69%,4.70%,5.83%,施用(NH4)2SO4对酸性紫色土的酸化有明显促进作用.An acidic purple soil collected from Beibei District of Chongqing was incubated at constant tem‐perature （28 ± 1 ℃） to study the effects of different rates of ammonium sulfate （0 ,100 and 200 mg/kg） on nitrification .During incubation of 0 -14 d ,nitrification increased in all the 3 ammonium sulfate treat‐ments ,the net nitrification rate being 0.920 ,1.15 and 1.50 mg/（kg-d） ,respectively ,and pH dropping by 0.16 ,0.35 and 0.51 pH units ,thus indicating that higher rate of （NH4）2SO4 led to a greater nitrifica‐tion and greater decrease in soil pH in the first stage of incubation .However ,net nitrification rate deceased to 0.220 ,-0.071 0 and -0.187 mg/（kg ？ d） ,and soil pH increased to 5.23 ,5.07 and 5.01 for the treatments of ammonium sulfate by 0 ,100 and 200 mg/kg after 14 days .In conclusion ,soil acidification was accelerated significantly with ammonium sulfate addition .

关 键 词：铵态氮肥 酸性紫色土 硝化作用 土壤酸化 

分 类 号：X171[环境科学与工程—环境科学] S153[农业科学—土壤学]