微咸水对冬小麦萌发及苗期生长发育的影响

Effect of brackish water on winter wheat seed germination and seedling growth

  • 摘要: 华北地区冬春干旱日益频繁, 而环渤海区微咸水资源丰富。探讨微咸水在冬小麦造墒或冬灌中应用的可行性, 对充分利用该区域的微咸水资源具有重要意义。本研究以华北地区不同生态型冬小麦品种(水旱兼用型“石家庄8号”、旱作型“晋麦47”和抗盐型“小偃81”)为试验材料, 采用盆栽方式, 分析了微咸水对冬小麦萌发和苗期生长发育及水分利用效率的影响。结果表明: 微咸水对“石家庄8号”和“小偃81”的萌发无影响, 使“晋麦47”的发芽势和发芽率显著降低, 而3个品种冬小麦的胚芽鲜重对微咸水处理无响应。微咸水处理抑制冬小麦根系的生长, 而促进了地上部的生长, 使“石家庄8号”、“小偃81”和“晋麦47”的根冠比分别降低51.6%、32.3%和36.8%, 使叶绿素含量分别提高38.5%、26.0%和12.9%。微咸水促进冬小麦的地上部生长, 提高冬小麦的水分利用效率, 但是对冬小麦苗期的根系生长有抑制作用。微咸水处理提高3个品种冬小麦的水分利用效率, 主要是由于降低了冬小麦的单株耗水量。

     

    Abstract: Despite the abundance of brackish water in the Bohai Sea region, seasonal (winter and spring) drought is persistent in north China. A pot experiment was therefore conducted to explore the use of brackish water in irrigation before winter wheat sowing or in winter irrigation. Three winter wheat cultivars (irrigated/dry land cultivar “Shijiazhuang 8”, dry land cultivar “Jinmai 47” and salt-resistant cultivar “Xiaoyan 81”), ecologically adapted to the North China, were used in the study. The modes of seed germination, seedling growth and development were analyzed. The results suggested that “Shijiazhuang 8” and “Xiaoyan 81” seed germination was not affected by brackish water irrigation. However, the energy and rate of germination of “Jinmai 47” dropped significantly. Germ fresh weights of the 3 cultivars were irresponsive to brackish water treatment. While wheat root growth was retarded, shoot growth was enhanced by brackish water irrigation. Root/shoot ratio of “Shijiazhuang 8”, “Jinmai 47” and “Xiaoyan 81” decreased by 51.6%, 36.8% and 32.3%, respectively. The corresponding contents of chlorophyll, however, increased by 38.5%, 12.9% and 26.0%. On the average, brackish water enhanced shoot growth of winter wheat. Water use efficiencies of the 3 winter wheat cultivars increased under brackish water irrigation. The high water use efficiency was driven mainly by limited water consumption and saline water uptake due to retarded root growth.

     

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