调亏灌溉对冬小麦光合特性及水分利用效率的影响

Effect of regulated deficit irrigation on photosynthetic characteristics & water use efficiency of winter wheat

在干旱棚内排除自然降雨条件下,研究了不同调亏灌溉对冬小麦水分利用效率及生理指标影响。结果表明:冬小麦产量随灌水量与灌水次数增加而增加;灌水量相同,拔节水的产量较孕穗水高,且水分利用效率最高。灌水量的增加与时间后移,延缓了花后叶面积指数的减少,整个灌浆时期,各处理叶面积指数的大小顺序是:拔节水60 mm+孕穗水60 mm+开花10 d灌水45 mm>拔节水60 mm+孕穗水60 mm>孕穗水60 mm>拔节水60 mm>不灌水(CK);并且提高了旗叶荧光参数Fv/F0、Fv/Fm的值和叶绿素含量,减少了丙二醛的含量。

Studies on photosynthetic characteristics ＆ water use efficiency of winter wheat under the condition of controlling rainfall ＆ different regulated deficit irrigations. The results showed that the yield of winter wheat would be better along with the increasing of irrigations. At the same irrigation, the yield of jointing water was higher than that of booting water. The WUE of jointing water was the highest among all the treatments. With the increase and postponement of water, the decrease of the LAI after blooming got lower. During filling stage, the LAI of different treatments was in such order： the LAI of treatment E was number one, the LAI of treatment D was ranked the second, that of treatment C the third, that of treatment B was the fourth, and the last one was no irrigation treatment A （CK）, and the Fv/Fo value ＆ Fv /Fm value of fluorescence parameters of wheat flags were also improved, and Chl content was improved, too. But the MDA content was decreased.