论文部分内容阅读
通过防雨棚小区栽培,控制土壤供水系数(Kw)分别为0.8、0.6、0.4、0.2,以自然状况下的小区为对照(CK),研究土壤水分条件对冬小麦生育后期叶片气体交换及叶绿素荧光参数的影响。结果表明:Kw为0.6处理的冬小麦叶片叶绿素含量与0.8处理接近,且显著高于其他处理(P<0.05);Kw为0.6处理对冬小麦叶片的气孔导度和蒸腾速率有轻度抑制,但其光合速率却高于0.8处理,而Kw为0.2处理的光合速率、气孔导度及蒸腾速率均为最低;气孔限制值在Kw为0.4处理下最高,其次为0.2处理,0.8处理下最低;冬小麦叶片的表观量子效率在Kw为0.4处理下最高,光补偿点总体上随着土壤水分含量的降低呈下降趋势,而光饱和点及最大光合速率则以Kw为0.6处理最高,其次为0.8处理,0.2处理最低;冬小麦叶片的天线转化效率Fv’/Fm’、电子传递速率ETR、实际量子效率ФPSII及光化学猝灭qP均以Kw为0.6处理最高,其次为0.8处理,0.2处理下最低;在Kw为0.2处理下,冬小麦光合作用主要受非气孔因素限制,而在0.4处理下,则主要受气孔因素限制。
Through the cultivation of rain-shelter plot, the control coefficient of soil water supply (Kw) were 0.8, 0.6, 0.4 and 0.2, respectively. Under natural conditions, CK was used to study the effects of soil moisture on leaf gas exchange and chlorophyll fluorescence Effect of parameters. The results showed that the chlorophyll content of winter wheat with Kw = 0.6 was close to that of 0.8, and it was significantly higher than that of other treatments (P <0.05). The treatment with Kw at 0.6 slightly inhibited the stomatal conductance and transpiration rate of winter wheat, Photosynthetic rate was higher than 0.8, and the photosynthetic rate, stomatal conductance and transpiration rate were the lowest when the treatment of Kw was 0.2; the limiting value of stomatal was the highest under the condition of Kw 0.4, followed by 0.2 and the lowest under 0.8; The apparent quantum yield was the highest at Kw 0.4. The light compensation point generally decreased with the decrease of soil water content, while the light saturation point and maximum photosynthetic rate were the highest at 0.6 and the second at 0.8, 0.2 was the lowest; the antenna conversion efficiency Fv ’/ Fm’, electron transfer rate ETR, actual quantum efficiency ФPSII and photochemical quenching qP of winter wheat leaves were highest at 0.6, followed by 0.8 at 0.2 and lowest at 0.2 Under 0.2, the photosynthesis of winter wheat was mainly restricted by non-stomatal factors, while under 0.4, the photosynthesis was mainly limited by stomatal factors.