玉米地土壤反硝化速率与N_2O排放通量的动态变化  

Dynamic of denitrification rate and N_2O flux in maize field.

作　　者：张玉铭[1] 董文旭[1] 曾江海[1] 陈德立[2] 

机构地区：[1]中国科学院石家庄农业现代化研究所,石家庄050021 [2]澳大利亚墨尔本大学土地和食品资源研究所

出　　处：《中国生态农业学报》2001年第4期70-72,共3页Chinese Journal of Eco-Agriculture

基　　金：澳大利亚ACIAR资助项目(LWR/96/164);国家重大基础研究(973)规划项目(G1999011803);"九五"中国科学院特别支持项目(KZ95T-04-01);中国科学院重大项目(K951-A1-301)共同资助

摘　　要：应用乙炔抑制原状土柱培育法测定了4种施肥处理的玉米地N素反硝化损失速率和氧化亚氮(N_2O)排放通量,并分析了它们与土壤湿度、土壤温度以及硝态氮(NO_3^--N)含量之间的关系,计算了因反硝化和N_2O排放造成的N肥损失率。结果表明,玉米生育期内土壤N素的反硝化损失量为0.67～3.85kg/hm^2,N肥的反硝化损失率为0.5％～1.5％;土壤N_2O排放总量为0.55～1.42kg/hm^2,N肥的N_2O排放系数为0.2％～0.5％。Denitrification rates and N2O fluxes are measured by using the acetylene inhibition method on intact soil cores in different N-fertilized maize plots. The relationships among denitrification rate and N2O flux with soil moisture, soil temperature and NO2--N concentration in soil are analyzed,and losses of N-fertilizer caused by denitrification and N2O emission are calculated. The results show that denitrification loss from soil is 0.67-3.85kg/hm2 during the growing period of maize,percentage of denitrification loss from N-fertilizer is 0.5%-1.5% ,the total N2O e-mission is 0.55-1.42kg/hm2,and N2O emission coefficient of N-fertilizer is 0.2%-0.5%.

关 键 词：土壤N素 反硝化速率 N2O排放通量 玉米地 动态变化 

分 类 号：S513.061[农业科学—作物学]