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本试验以耐肥性不同的三个小麦品种为试材,对其不同N素水平下的需光特性进行了测定。结果表明,增施N肥,提高了不耐肥品种(昌乐5号)的光饱和点,降低了其光饱和时的最大光合速率;而耐肥性较强的品种(泰山一号和济南13)则与之相反。虽然施N既促进了暗呼吸速率,又提高了光补偿点,但促进程度为不耐肥品种高于耐肥品种。若以光强系数作为评价光合作用对光能利用的指标,弱光下的光强系数明显地比强光下高。增施N肥,提高了耐肥性较强品种的光强系数和表观量子效率,降低了其表现量子需要量,故提高了光合作用对光能的利用效率。但对不耐肥品种的影响则反之。
In this experiment, three wheat cultivars with different fertilizer tolerances were used as test materials, and their light-demanding characteristics under different levels of N were measured. The results showed that increasing N fertilizer increased the light saturation point of non-fertilizer-tolerant variety Changle 5 and decreased the maximum photosynthetic rate when light-saturated. The varieties with high tolerance (Taishan No.1 and Jinan 13) is the opposite. Although application of N promoted dark respiration rate and improved the light compensation point, the degree of promotion was higher than that of the resistant varieties. If the light intensity coefficient is used as an index to evaluate the light energy utilization by photosynthesis, the light intensity coefficient under weak light is obviously higher than that under strong light. The application of N fertilizer increased the light intensity coefficient and apparent quantum yield of strong resistant varieties and reduced their quantum performance requirements, thus improving the utilization efficiency of light energy by photosynthesis. But the impact of non-fattening varieties on the contrary.