脲酶/硝化抑制剂对土壤有效态氮、微生物量氮和小麦氮吸收的影响  

Effects of urease/nitrification inhibitors on soil available N and microbial biomass N and on N uptake of wheat.

作　　者：焦晓光[1] 梁文举[1] 陈利军[1] 姜勇[1] 闻大中[1] 

机构地区：[1]中国科学院沈阳应用生态研究所

出　　处：《应用生态学报》2004年第10期1903-1906,共4页Chinese Journal of Applied Ecology

基　　金：国家"8 63"计划项目 ( 2 0 0 4AA2 460 2 0 );中国科学院沈阳生态实验站基金资助项目 (SYZ0 2 0 4)

摘　　要：研究了脲酶抑制剂 (NBPT)、硝化抑制剂 (DCD)及二者组合在草甸棕壤上施用对尿素态N转化及土壤总有效态N、微生物量N的影响 .结果表明 ,尿素配施NBPT、DCD及抑制剂组合能够增加尿素水解后土壤NH+ 4 含量 2 %～ 5 3% ,显著降低了氧化态N的浓度 ,抑制了土壤中铵态N的氧化 ,增加土壤总有效N 34%～ 4 4 % ,小麦吸N量增加 0 2 6 %～ 6 79% ,其中以脲酶抑制剂与硝化抑制剂组合的效果最明显 .抑制剂施用增加了微生物在小麦生长初期对有效态N固持 ,有利于后期土壤有效态N的矿化 .With an aquic brown earth as test soil,this paper studied the effects of urease inhibitor(NBPT),nitrification inhibitor(DCD)and their combinations on the dynamics of soil available N and microbial biomass N.The results showed that the treatments of inhibitors,especially the combined application of NBPT and DCD,could increase soil NH+ 4-N by 2%～53%,inhibit NH+ 4oxidation,decrease soil NO- 3-N concentration,increase soil total available N by 34%～44%,and increase wheat N uptake by 0.26%～6.79%.The best treatment was urease inhibitor combined with nitrification inhibitor.The application of inhibitors increased soil microbial biomass N immobilization at the early growth stage of wheat,and promoted soil N mineralization at filling stage.

关 键 词：脲酶抑制剂 硝化抑制剂 有效态N 微生物量N 小麦N吸收 

分 类 号：S143.1[农业科学—肥料学]