在石羊河中游绿洲田间条件下，以中熟食葵品种LD5009为指示品种，研究了早期干旱处理与花期复水对向日葵植株生长及叶片水分状况的影响。结果表明，适度干旱后复水可提高向日葵叶片相对含水量，降低水分饱和亏。花期前适度干旱对向日葵株高、茎粗、比叶重的增加有明显抑制作用，开花初期复水后植株生长迅速，光能利用效率与充分灌溉无显著差异，干物质积累量实现等量补偿，且有助于干物质向花盘、籽粒的转移。甘肃河西走廊地区实施向日葵生育前期适度亏缺灌溉可行。

With LD5009 as the indicator material， the effect of early drought treatment and anthesis re-irrigation on the growth of sunflower plants and water content of leaves was studied under field condition in oasis in the middle reaches of Shiyang River. The results show that after moderate drought and re-irrigation， the relative water content of sunflower leaves can be increased and the water saturation loss can be reduced. Moderate drought before flowering has a significant inhibitory effect on the increase of sunflower plant height， stem thickness and leaf weight. After rehydration at the initial stage of flowering， the plant grows rapidly. It is feasible to implement moderate deficit irrigation in the early stage of sunflower growth in Hexi Corridor Area of Gansu Province.

S565.5