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以2个不同株型水稻品种为材料,设置高、中、低3个施氮水平,利用SunScan冠层分析仪于灌浆期系统测定了不同施氮水平下不同株型水稻品种植株形态和冠层内光合有效辐射(PAR)的时空分布状况.结果表明:施氮量对水稻株高、穗弯曲度和茎叶夹角有明显影响;群体叶面积的垂直分布呈中部>上部>下部的分布特征,最大分层叶面积指数(LAI)出现在0.60相对高度处.冠层内平均PAR透光率从顶部向下递减,且在冠层上中部递减迅速,下部递减缓慢;平均PAR透光率随施氮量的增加而递减;平均PAR透光率日变化表现为早晚较低,中午较高;平均PAR透光率随向下累积LAI的增加呈指数递减,群体消光系数K的日变化表现为早晚较高,中午较低,灌浆期的K值介于0.35～0.50.水稻冠层内PAR的三维空间分布表现为冠层上中部水平面上PAR透光率高,光斑面积大;下部水平面上PAR透光率低,光斑少;同一冠层高度水平面上的PAR光强呈不均匀分布.株型紧凑的水稻品种,冠层透光率高,透光率日变化大,群体消光系数小.
Two high-yielding, medium-yielding and low-yielding nitrogen fertilizers were set up using two different rice varieties. At the grain filling stage, SunScan canopy analyzer was used to determine the plant morphology and canopy under different N rates Spatiotemporal distribution of photosynthetically active radiation (PAR). The results showed that nitrogen application had significant effects on the plant height, spike curvature and the angle of stems and leaves of rice. The vertical distribution of leaf area of the population showed the distribution characteristics of middle> upper> lower part , The maximum laminar leaf area index (LAI) appeared at a relative height of 0.60.The average PAR transmittance in the canopy decreased from the top downwards, decreasing rapidly in the middle of the canopy and decreasing slowly in the lower part. The average PAR transmittance While the average PAR transmittance decreased with the increase of nitrogen application rate. The daily average PAR transmittance decreased with the increasing of morning and night, and the average PAR transmittance decreased exponentially with the increase of downward LAI. The diurnal variation of population extinction coefficient K was Higher in the morning and evening, lower in the noon and K = 0.35 ~ 0.50 in the grain filling stage.The three-dimensional spatial distribution of PAR in the canopy showed that the PAR of the upper middle canopy was high and the light spot area was large. Low light transmittance, less spots; the same canopy PAR light intensity on the horizontal plane of the non-uniform distribution of compact plant type rice variety, canopy high transmittance, high light transmittance diurnal variation, the extinction coefficient small groups.