【摘要】 分析东北地区春玉米肥料农学效率和偏生产力的变异,研究其变异机制,对提高东北玉米氮肥利用效率提供重要理论依据。以2010年以来东北地区开展的测土配方施肥项目"3414"的921个田间试验的方法,研究氮肥偏生产力（PFPN）和氮肥农学利用效率（AE_N）的变异机制。AEN随着施氮量和Y₀/Y_G的增加而减小,随着增产量（DY）的增加而增加,随着F_N/（1-Y₀/Y_G）的增加而明显减小;PFP_N随着Y₀的增加而增加,随着施肥量的增加而减小,在同一施肥量的情况下随着Y₀的增加而逐渐增大,随着Y_O/F_N的增加而显著增加,其中Y₀代表不施肥的基础产量,Y_G代表施肥后的目标产量,F_N代表施氮量。研究发现,F_N和Y0/Y_G是氮肥农学利用效率的两条变异途径,土壤氮素供应强度是影响AE_N的主要因素;Y₀和F_N是氮肥偏生产力的两条变异途径,肥料氮素供给是影响PFP_N的主要因素。更多还原

【Abstract】 The variation of fertilizer agronomic efficiency and partial productivity of spring maize in Northeast China was analyzed,and its variation mechanism was studied,which provided important theoretical basis for improving nitrogen use efficiency of spring maize in Northeast China.The variation mechanism of partial productivity of nitrogen fertilizer（PFP_N）and agronomic efficiency of nitrogen fertilizer（AE_N）was studied by 921 field experiments of"3414"in Northeast China since 2010.AE_N decreased with the increase of nitrogen application and Y₀/Y_G（Y₀ and YG are bisic yield and target yield,respectively）,increased with the increase of DY（YG-Y₀）,and decreased with the increase of FN/（1-Y₀/Y_G）;PFP_N increased with the increase of Y₀,decreased with the increase of fertilizer application,increased with the increase of Y₀,and increased significantly with the increase of Y₀/F_N.It was found that F_N and Y₀/Y_G were two variation pathways of nitrogen fertilizer agronomic use efficiency.Soil nitrogen supply intensity was the main factor affecting AE_N,Y₀ and F_N were two variation pathways of partial productivity of nitrogen fertilizer,and fertilizer nitrogen supply was the main factor affecting PFP_N.更多还原