小麦生育后期限量供水对生理指标的影响

采用盆栽方法,在小麦生育后期控水条件下研究干旱对小麦产生的生理影响。结果表明:小麦生育后期不同时段对土壤水分亏缺的敏感程度不同。轻度水分亏缺促使旗叶水势增大,光合速率提高,蒸腾速率下降,灌浆速率下降,灌浆高峰提前。在花后10天内轻度水分亏缺,可提高光合速率,并保持较长时间。因此,本研究认为土壤最大毛管含水量为50%-55%,并在小麦花后10天内成为一个重要的控水指标。

The Effect on the Physiological Index of Wheat Caused by Limited Water Supply During the Last Stage of Wheat Development

This paper discusses the drought's physiological effect on wheat from water aridity under the water control condition during the last stage of wheat development. The results shows: wheat has different level of sensitivity to water aridity in soil, during the different time period in the last stage of wheat development. Minor water aridity in soil impels the increase of water density in leaves, higher photosynthesis speed, lower evaporation speed, lower in milk speed, earlier in milk peak. Minor water aridity within the first 10 days after blooming, can increase photosynthesis speed for a longer period of time. Therefore, our research shows that the water in soil should be kept between 50% to 55% during the first 10 days after blooming.