【摘要】 本研究通过3年试验,证明了玉米群体冠层特征及群体内光分布和光合效率随种植密度和施N量而有明显变化。叶面积大小是导致冠层特征变化的主导因子。平展型单交种丹玉13的籽粒产量高限出现在最大LAI变化于4.10—4.75之间,其冠层垂直方向上最大叶面积密度趋于由中部向中上部推移。叶片倾角和消光系数调节幅度趋于明显增加,光合速率、净同化率和相对生长率尚未明显下降。光截获率达94.0—95.0％,冠层中部透光率在15％以上,光合有效辐射在200—300μE/m~2s,群体光能利用率达1.38％左右。更多还原

【Abstract】 The experiments on relationship among canopy characlers, light interception andyield in maize populations with through different planting density and fertilizer quanti-ty were conducted in 1986--1988. The results indicated that there were significant dif-ferences in light distribution and photosynthetic efficiency among treatments. LAI wasa principle factor causing changes of canopy character. The maximum grain yield oc-cured while LAI varing from 4.10 to 4.75, and there were tendencies that the heightof maximum leaf area layer seemed to move up. Leaf inclination and extinctioncoefficient K tended to regulete obviously. At the same time photosynthetic rate、netassimulation rate and relative growth rate did not drop significantly, light interceptionreached 94.0--94.6%, transmitting rate of light on middle layer of canopy wasabove 15%, photosynthetically active radiation was 200--300μE/m~2. s andutilization rate of Solar energy was 1.23--1.38%.更多还原