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研究了NaCl胁迫下大米草净光合速率(Pn)、蒸腾速率(Tr),叶片气孔导度(Gs)、细胞间CO2浓度(Ci)、株高、叶长、叶宽、茎粗、叶绿素含量、气孔限制值和水分利用效率。结果表明:当NaCl浓度高于300mmol/L时,大米草Pn、Tr、Gs、株高、叶长以及叶绿素含量受到显著抑制(P<0.05),叶宽及茎粗则无显著性差异。NaCl胁迫下,大米草光合速率的降低是气孔因素和非气孔因素综合导致的结果,Pn、Tr、Gs、株高以及叶绿素含量的降低可作为大米草受NaCl胁迫的症状,而WUE则保持在较高的水平,因此在防治大米草蔓延时,排水处理不是最佳选择。
The effects of NaCl stress on net photosynthetic rate (Pn), transpiration rate (Tr), leaf stomatal conductance (Gs), intercellular CO2 concentration (Ci), plant height, leaf length, leaf width, stem diameter, chlorophyll content , Stomatal limitation and water use efficiency. The results showed that Pn, Tr, Gs, plant height, leaf length and chlorophyll content were significantly inhibited (P <0.05) and leaf width and stem diameter were not significantly different when NaCl concentration was higher than 300 mmol / L. Under NaCl stress, the decrease of photosynthetic rate was the result of the combination of stomatal and non-stomatal factors. The decrease of Pn, Tr, Gs, plant height and chlorophyll content could be regarded as the symptom of NaCl stress, while WUE Higher level, so in the control of the spread of rice grass, drainage is not the best choice.