不同淹水程度对棉花苗期生长及生理变化的影响

为了明确棉花遭受涝害胁迫后的适应能力,采用盆栽种植方式,在避雨棚内对苗期棉株进行淹水,研究不同淹水程度下棉花形态、产物及生理变化。结果表明:淹水后棉花产量、单株成铃率、单铃重、株高、叶片数、单株干物质积累量均减少,而衣分没有变化;随着淹水时间的增加,各指标将进一步降低,淹水20天后,叶片SPAD值急剧下降,皮棉产量减少了80%以上,基本绝收。综合分析表明,淹水15天可以认为是棉花苗期适应涝害胁迫的临界时间,在此之前棉花可以通过栽培技术措施进行补救,恢复生长。

Effect of Waterlogging Degree on Cotton Seedling Growth and Physiological Change

In order to clarify the adaptability of cotton after waterlogging stres. cotton morphology, production and physiological changes at the seedling stage under different flooding degree were studied by using a pot experiment. The results showed that after flooding, cotton production, the rate of bolls per plant, boll weight, plant height, number of leaves and dry matter accumulation of per plant reduced, while Lint percentage did not change; with the flooding time increasing, various indicators continued reducing. after flooding 20d, leaf SPAD value declined rapidly, cotton lint yield decreased by more than 80%, even total crop failure. Overall, flooding 15d could be considered the critical time of cotton to adapt waterlogging stress during seedling stage , so cotton can resuming growing through cultural technique measure before the critical time.