生态学杂志2018，Vol.37Issue(3)：891-897,7.DOI:10.13292/j.1000-4890.201803.005
种植密度对川中丘区夏玉米冠层结构、干物质积累及产量的影响
Effects of planting density on canopy structure, dry matter accumulation and yield of summer maize in a hilly region of central Sichuan Province, China
摘要
Abstract
Five planting densities (4.50×104,5.25× 104,6.00× 104,6.75× 104 and 7.50× 104 plants · hm-2,designated as T1,T2,T3,T4 and T5,respectively) were set up to explore the effects of planting density on canopy structure,dry matter accumulation and yield of summer maize,aiming to provide theoretical basis and technical support for high-yield cultivation of summer maize in the hilly area of central Sichuan,China.The results showed that with the increase of planting density,leaf area index (LAI) of maize was significantly increased,whereas the stem diameter,the angle between stem and leaf,and the transmittance were significantly decreased.With the planting density increasing by 1 × 104 plants · hm-2,the stem diameter decreased by 1.4 mm in 2015 and 1.3 mm in 2016,the first leaf angles uppermost and underneath ear reduced by 3.601° and 1.440°,and the bottom transmission at silking and mid-filling stages reduced by 3.73％ and 2.82％,respectively.The dry matter accumulation of individual maize was significantly decreased,while the dry matter increased with the increase of planting density.Compared with T1,the dry matter accumulation of per individual in T5 decreased by 37.13％ (2015),25.95％ (2016) at the maturity stage,and the dry matter accumulation at community level of 2016 increased by 26.72％,23.41％ in 7 days after silking and at the maturity stage,respectively.With the increase of planting density,the yield of summer maize first increased and then decreased,with the highest value being found at 6.00×104 plants · hm-2.At such a density,the group and individual function of maize reached a synergistic gain and maize yield compositions (effective panicle number,grains per spike and grain weight) were coordinated,which accounted for the increase of maize yield.关键词
夏玉米/种植密度/冠层结构/干物质积累/产量Key words
summer maize/planting density/canopy structure/dry matter accumulation/yield引用本文复制引用
马晓君,孔凡磊,路明远,李兰,李强,吴雅薇,刘晓林,王兴龙,金容,袁继超..种植密度对川中丘区夏玉米冠层结构、干物质积累及产量的影响[J].生态学杂志,2018,37(3):891-897,7.基金项目
国家重点研发计划项目(2016YFD0300307)、公益性行业(农业)科研专项经费(20150312705)和四川省玉米产业技术体系岗位专家项目资助. （2016YFD0300307）
