新疆高产油葵群体光合特性的初步研究

Studies on Canopy Photosynthetic Characteristics of High Yield Oil Sunflower in Xinjiang

对油葵群体光合作用及相关性状的初步研究结果表明 :油葵群体净光合日变化呈单峰曲线 ,峰值一般出现在 1 2 :0 0～ 1 3:0 0 ,净光合持续时间为 1 3h ,中上部叶层透光率较大 ,且对光合产物的贡献率达 85%,春播的群体光合高于复播 ,这与春播油葵的籽粒干物质积累速率、灌浆速率及产量分别比复播高出 2 9.7%、5.6%及 1 0 .

The preliminary study on canopy photosynthetic characteristics of oil sunflower indicates the change of canopy photosynthetic rate in sunflower at various times of day generally varied according to a single peak,the peak shows up about 12:00～13:00 am.The transparence was the highest in upper middle in full bloom period,and the contribution to photosynthesis in upper middle leaf levels was over 85%.Compare spring sowing with multi harvesting oil sunflower,it was found that the canopy photosynthetic rate of spring sowing was higher so that dry matter,filling of seed and yield were 27.9%、5.6% and 10.6% higher than those of multi harvesting oil sunflower.