水分胁迫对水稻腾发量及产量的影响

采用盆栽与蒸渗仪栽培平行进行的方法,研究了水分胁迫对水稻形态、腾发量及产量的影响,结果表明:水稻分蘖期遭受胁迫使其分蘖数显著减少,叶面积指数明显减小,轻度胁迫日腾发量比对照平均降低0.82 mm,中度胁迫平均降低2.26 mm,重度胁迫平均降低3.43 mm。拔节孕穗期遭受水分胁迫在单阶段胁迫中减产幅度最大。多阶段连续轻度水分胁迫,对水稻分蘖、叶面积指数及产量的影响极为显著,影响程度超过任一时段单阶段重度水分胁迫。

Effect of Water Stress on Evapotranspiration and Yield of Rice

The experiment with pot planting and lysimeter was carried out to study the effect water stress on the morphology,evapotranspiration and yield in rice.The results showed that water stress at tillering stage resulted in less tiller numbers and leas area index.The daily evapotranspirations of light stress,medium stress and severe stress were lower than average by 0.82 mm,2.26 mm and 3.43 mm,respectively.The yield decreased most if the plant suffered water stress at jointing stage.The effect of medium water stresses at several stages on tillering,leaf area index and yield was very significant,surpassing the effect of severe water stress at any one stage.