苏打盐碱胁迫对灌浆期水稻剑叶光合特性和产量的影响

目的]探究苏打盐碱胁迫对灌浆期水稻剑叶光合特性和产量的影响。方法]盆栽条件下,以苏打盐碱土与自然黑土按比例配制成8种不同浓度的盐碱土,于水稻灌浆期测定各处理水稻叶片光合生理指标。结果]轻度盐碱胁迫下,水稻的Pn、Gs和Tr差异不明显;随着盐碱胁迫的进一步增强,各处理水稻的Pn、Gs和Tr下降显著。不同处理胞间CO_2浓度(Ci)变化不大,说明气孔限制小,盐碱胁迫下Pn的下降来自于非气孔限制因素。结论]盐碱胁迫下,水稻的光合作用和产量受到影响,轻度盐碱胁迫下,水稻光合作用和产量下降不显著,随着盐碱胁迫的增强,开始显著下降。

Effects of Saline Sodic Stress on Photosynthetic Characteristics of Flag Leaves and Yield of Rice at Filling Stage

Objective]To study the effects of saline sodic stress on photosynthetic characteristics of flag leaves and yield of rice at filling stage. Method]The pot culture experiment was conducted to study the photosynthetic and physiological indexes of flag leaves of rice at filling stage in different treatments by mixing 8 different concentrations of saline-alkali soils according to the proportion of the soda saline-alkali soil and natural soil.Result]Under light saline sodic stress,the differences in Pn,Gs and Tr were not significant.With the further enhancement of saline-alkali stress,the differences in Pn,Gs and Tr between different treatments were significant.Intercellular CO2concentration(Ci)in different treatments had little changes,indicating that stomatal limitation effects were little.The decrease of Pn was from non-stomatal limitation effect under saline sodic stress.Conclusion]Under saline-alkali stress,photosynthetic characteristics in flag leaves and yield of rice decreased.Under light saline-alkali stress,photosynthetic characteristics and yield of rice showed no significant decrease.With the increase of saline-alkali stress,the decline became significant.