种植密度对晚播冬小麦荧光动力学参数和产量的影响

Effect of Planting Density on Fluorescence Induction Kinetic Parameters and Yield of Winter Wheat under Late-sowing

为明确晚播冬小麦合理的群体结构,以济麦22为试验材料,研究了种植密度对晚播冬小麦叶绿素荧光动力学参数和产量的影响。结果表明,增加种植密度到300万~420万/hm2时,可改善晚播小麦叶片光合功能,提高灌浆期最大光合速率(P m)、初始斜率(α)和最小半饱和光强(L k);其SPAD值、PSⅡ最大光化学效率(Fv/Fm)、PSⅡ潜在活性(Fv/Fo)、实际光化学效率(ΦPSⅡ)、荧光光化学淬灭系数(qP)和非光化学猝灭系数(qN)等叶绿素荧光动力学参数较优,最终产量明显高于其他处理。表明合理的种植密度可改善晚播冬小麦光合功能,提高籽粒产量水平。

In order to definite a reasonable population composition of late-sowing winter wheat ,we selected Ji-mai 22 as field experimental material ,and studied the effect of planting density on fluorescence induction kinetic pa-rameters and yield of late-sowing winter wheat .The results indicated that the treatments of planting density of 300 ×10 4 -420 ×10 4/ha could improve photosynthetic function of late-sowing wheat ,and increased maximum pho-tosynthetic rate ,initial slope and the minimum half-saturated light intensity .The maximum photochemical efficiency (Fv/Fm),the PSⅡpotential activity(Fv/Fo),actual photochemical efficiency of PSⅡ(ΦPSⅡ),photo chemical quenching coefficient ( qP) and non photo chemical quenching coefficient ( qN) were higher of flag leaves and grain yield were higher in treatments of planting density of 300-420 10 4/ha.In result,the reasonable planting density could improve photosynthetic function of late-sowing wheat and increase grain yield .