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以郑单958、先玉335为试验材料,在五个密度水平下对不同光强的光合要素进行了分析。结果表明,在1300~1900μmol·m-2·s-1光强范围内,净光合速率随光强的升高逐渐增加,各密度处理在1700μmol·m-2·s-1和1900μmol·m-2·s-1光强下,净光合速率达到最高。相同光照强度下,30 000株·hm-2密度的净光合速率最大,90 000株·hm-2密度的净光合速率最小。适宜密植,虽然降低了单株的光合能力,但群体光能利用率得到显著提高,利于群体干物质积累及产量的提升。
Taking Zhengdan 958 and Xian-Yu 335 as experimental materials, the photosynthetic elements of different light intensity were analyzed under five density levels. The results showed that under the light intensity range of 1300 ~ 1900μmol · m-2 · s-1, the net photosynthetic rate increased with the increase of light intensity, and the average photosynthetic rate increased with the increase of light intensity at 1700μmol · m-2 · s-1 and 1900μmol · m- 2 · s-1 light intensity, net photosynthetic rate reached the highest. Under the same light intensity, the net photosynthetic rate of 30 000 plants · hm-2 was the highest, and the net photosynthetic rate of 90 000 plants · hm-2 was the lowest. Suitable for close planting, although reducing the photosynthetic capacity of individual plants, but the population light energy utilization rate has been significantly improved, which is conducive to population dry matter accumulation and yield improvement.