土壤学报2013，Vol.50Issue(1)：130-137,8.
施肥对夏玉米季紫色土N2O排放及反硝化作用的影响
EFFECTS OF FERTILIZATION ON N2O EMISSION AND DENITRIFICATION IN PURPLE SOIL DURING SUMMER MAIZE SEASON IN THE SICHUAN BASIN
摘要
Abstract
The culture method of undisturbed soil cores-acetylene inhibitor was used in order to study effects of fertilization on N2O emission fluxes and denitrification rates during summer corn growing season in purple soil in the hilly area of the central Sichuan Basin.Results show that during the season,N loss through N2O emission and denitrification was significantly higher in purple soil with fertilization than without fertilization.Significant differences were observed between different fertilization treatments.The N2O emission flux in Treatment OM (pig manure),OMNPK (pig manure with NPK fertilizer),N (pure N fertilizer),NPK (fertilizer NPK),and RSDNPK (crop residues returned with NPK fertilizer) was 3.01,2.86,2.51,2.19 and 1.88 kg hm-2,respectively,accounting for 1.63％,1.53％,1.30％,1.09％ and 0.88％,respectively,of the total fertilizer nitrogen applied to the crop.The N loss through denitrification in those treatments were 6.74,6.11,5.23,4.69 and 4.12 kg hm-2,respectively,accounting for 3.97％,3.55％,2.97％,2.61％ and 2.23％,respectively of the fertilizer N applied during the season.The N loss through N2O emission and denitrification in Treatment CK (no fertilization) was 0.56 and 0.78 kg hm-2,respectively,only.Fertilization was obviously the main driving force of peak emergence of soil N2O emission and denitrification in the early growth stage of corn (2 weeks) in purple soil.Inorganic N (ammonium and nitrate) content was the limiting factor of soil N2O emission,nitrification and denitrification.Soil moisture driven by rainfall was an important influencing factor.The ratio of N losses through N2O emission and denitrification ranged from 0.45 to 0.72.Soil N loss was significantly higher through denitrification than through N2O emissions,which implies that the soil denitrification was the main pathway of fertilizer N loss during the maize growing season in the hilly area of purple soils.关键词
施肥/N2O排放通量/反硝化损失/玉米/紫色土Key words
N2O emission/ Denitrification loss/ Fertilization regimes/ Corn/ Purple soil分类
农业科技引用本文复制引用
曾泽彬,朱波,朱雪梅,刘学锋,王彦..施肥对夏玉米季紫色土N2O排放及反硝化作用的影响[J].土壤学报,2013,50(1):130-137,8.基金项目
国家重点基础研究发展计划课题(2012CB417101)和国家自然科学基金项目(41271321)联合资助 （2012CB417101）
