摘要： 在67 500,82 500株/hm²密度水平下,以常规等行距种植方式为对照,比较分析不同缩行宽带种植方式(三行一带、四行一带、五行一带)对夏玉米碳、氮代谢与氮素利用效率的影响。结果表明,缩行宽带种植方式成熟期地上部总氮累积量、氮收获指数均高于对照等行距种植方式,其中三行一带、四行一带、五行一带种植方式地上部总氮累积量分别高于对照16.2%,16.9%,20.0%。籽粒产量较等行距种植方式均有不同程度增加,并达到显著水平。本研究中,成熟期地上部总氮量、叶片氮转运量与籽粒产量呈显著正相关,说明成熟期较高的地上部总氮积累、叶片高氮转运量可促进籽粒产量提高。而成熟期叶片C/N与籽粒产量呈显著负相关,各处理中,三行一带种植方式在低密度和高密度条件下成熟期叶片C/N均最低,而对照等行距种植方式值最高。

关键词: 夏玉米, 种植方式, 氮积累, 碳氮比, 氮转运

Abstract: Effects of different shrink line-wild line planting patterns,i.e.three-row strip,four-row strip,five-row strip on the carbon and nitrogen metabolism of summer maize were analyzed with two planting densities ( 67 500, 82 500 plants per ha ),and convention equal line planting pattern was as control. Compared with control,the N ac-cumulation of above ground in maturity stage increased by 16.2%,16.9%,20.0%under three-row strip,four-row strip and five-row strip cropping pattern,respectively,and the yield also significantly increased. Positive correlation was observed between N accumulation,leaf N translocation amount and grain yield,which provided the evidence that higher grain yield and recovery of N fertilizer could be obtained by increasing N accumulation and translocation. Negative correlation was found between the C/N ratio in leaf at maturity stage and yield,and the lowest C/N ratio in leaf at maturity stage was in the treatments of three-row strip under both low density and high density, while CK showed the highest C/N ratio in leaf.

Key words: Summer maize, Planting patterns, Nitrogen accumulation, C /N ratio, Nitrogen translocation

中图分类号: 

• S513